@_@ треш

demo/.gitignore

@@ -0,0 +1,39 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+*.db

demo/build.gradle

@@ -0,0 +1,27 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.0.2'
+	id 'io.spring.dependency-management' version '1.1.0'
+}
+
+group = 'com.example'
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = '17'
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+//	implementation 'org.postgresql:postgresql:'
+	implementation 'com.h2database:h2:2.1.210'
+	implementation 'org.springframework.boot:spring-boot-starter-validation'
+	implementation group: 'org.springdoc', name: 'springdoc-openapi-ui', version: '1.6.5'
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}

demo/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

demo/gradlew

@@ -0,0 +1,240 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

demo/gradlew.bat

@@ -0,0 +1,91 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

demo/settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'demo'

demo/src/main/java/com/example/demo/DemoApplication.java

@@ -0,0 +1,12 @@
+package com.example.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+
+public class DemoApplication {
+	public static void main(String[] args) {
+		SpringApplication.run(DemoApplication.class, args);
+	}
+}

demo/src/main/java/com/example/demo/supply/controllers/ProductController.java

@@ -0,0 +1,47 @@
+package com.example.demo.supply.controllers;
+
+import com.example.demo.supply.models.Product;
+import com.example.demo.supply.services.ProductService;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@CrossOrigin
+@RequestMapping("/product")
+public class ProductController {
+
+    private final ProductService productService;
+
+    public ProductController(ProductService productService) {
+        this.productService = productService;
+    }
+
+    @GetMapping("/{id}")
+    public Product getProduct(@PathVariable Long id) {
+        return productService.findProduct(id);
+    }
+
+    @GetMapping("/")
+    public List<Product> getProduct() {
+        return productService.findAllProducts();
+    }
+
+    @PostMapping("/")
+    public Product createProduct(@RequestParam() String name,
+                                 @RequestParam() float cost) {
+        return productService.addProduct(name, cost);
+    }
+
+    @PatchMapping("/{id}")
+    public Product updateProduct(@PathVariable Long id,
+                                 @RequestParam() String name,
+                                 @RequestParam() float cost) {
+        return productService.updateProduct(id, name, cost);
+    }
+
+    @DeleteMapping("/{id}")
+    public Product deleteProduct(@PathVariable Long id) {
+        return productService.deleteProduct(id);
+    }
+}

demo/src/main/java/com/example/demo/supply/controllers/SupplierController.java

@@ -0,0 +1,43 @@
+package com.example.demo.supply.controllers;
+
+import com.example.demo.supply.models.Supplier;
+import com.example.demo.supply.services.SupplierService;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+public class SupplierController {
+    private final SupplierService supplierService;
+
+    public SupplierController(SupplierService supplierService) {
+        this.supplierService = supplierService;
+    }
+
+    @GetMapping("/{id}")
+    public Supplier getSupplier(@PathVariable Long id) {
+        return supplierService.findSupplier(id);
+    }
+
+    @GetMapping("/")
+    public List<Supplier> getSupplier() {
+        return supplierService.findAllSuppliers();
+    }
+
+    @PostMapping("/")
+    public Supplier createSupplier(@RequestParam() String name,
+                                   @RequestParam() int license) {
+        return supplierService.addSupplier(name, license);
+    }
+
+    @PatchMapping("/{id}")
+    public Supplier updateSupplier(@PathVariable Long id,
+                                   @RequestParam() String name,
+                                   @RequestParam() int license) {
+        return supplierService.updateSupplier(id, name, license);
+    }
+
+    @DeleteMapping("/{id}")
+    public Supplier deleteSupplier(@PathVariable Long id) {
+        return supplierService.deleteSupplier(id);
+    }
+}

demo/src/main/java/com/example/demo/supply/models/Orders.java

@@ -0,0 +1,92 @@
+package com.example.demo.supply.models;
+
+import jakarta.persistence.*;
+
+import java.sql.Date;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+@Entity
+public class Orders {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    @Column
+    @Temporal(TemporalType.DATE)
+    private Date dateOfOrder;
+
+    @ManyToOne(fetch = FetchType.EAGER, cascade = {CascadeType.MERGE})
+    @JoinColumn(name = "supplier_fk")
+    private Supplier supplier;
+    @ManyToMany(fetch = FetchType.EAGER, cascade = {
+            CascadeType.PERSIST,
+            CascadeType.MERGE
+    })
+    @JoinTable(name = "ordersAndProducts",joinColumns = @JoinColumn(name = "order_fk"),
+                inverseJoinColumns = @JoinColumn(name = "product_fk"))
+    private List<Product> products;
+
+    public Long getId(){
+        return id;
+    }
+    public Orders(Date dateOfOrder) {
+        this.dateOfOrder = dateOfOrder;
+        products = new ArrayList<>();
+    }
+
+    public Orders() {
+    }
+
+    public Date getDateOfOrder() {
+        return dateOfOrder;
+    }
+    public void setDateOfOrder(Date dateOfOrder) {
+        this.dateOfOrder = dateOfOrder;
+    }
+    public Supplier getSupplier() {
+        return supplier;
+    }
+    public void setSupplier(Supplier supplier) {
+        this.supplier = supplier;
+        supplier.getOrders().add(this);
+    }
+    public List<Product> getProducts() {
+        return products;
+    }
+    public void setProducts(List<Product> products) {
+        this.products = products;
+    }
+    public void addProduct(Product product){
+        if(!products.contains(product)){
+            products.add(product);
+            product.getOrders().add(this);
+        }
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Orders order = (Orders) o;
+        if(!Objects.equals(id, order.id)) return false;
+
+        if(!Objects.equals(dateOfOrder.toString(), order.dateOfOrder.toString())) return false;
+        if(!Objects.equals(supplier, order.supplier)) return false;
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Product{" +
+                "id=" + id +
+                ", date='" + dateOfOrder + '\'' +
+                '}';
+    }
+}

demo/src/main/java/com/example/demo/supply/models/Product.java

@@ -0,0 +1,75 @@
+package com.example.demo.supply.models;
+
+import jakarta.persistence.*;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+@Entity
+public class Product {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+
+    @Column(nullable = false)
+    private String name;
+    @Column(nullable = false)
+    private double cost;
+    @ManyToMany(fetch = FetchType.EAGER, mappedBy = "products")
+    private List<Orders> orders;
+
+    public Product(){}
+
+    public Product(String name, double cost){
+        this.name = name;
+        this.cost = cost;
+        orders = new ArrayList<>();
+    }
+
+    public long getId() {
+        return id;
+    }
+    public String getName() {
+        return name;
+    }
+    public void setName(String name) {
+        this.name = name;
+    }
+    public double getCost() {
+        return cost;
+    }
+    public void setCost(float cost) {
+        this.cost = cost;
+    }
+
+    public List<Orders> getOrders() {
+        return orders;
+    }
+
+    public void setOrders(List<Orders> orders) {
+        this.orders = orders;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Product product = (Product) o;
+        return Objects.equals(id, product.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Product{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", cost='" + cost + '\'' +
+                '}';
+    }
+}

demo/src/main/java/com/example/demo/supply/models/Supplier.java

@@ -0,0 +1,77 @@
+package com.example.demo.supply.models;
+
+import jakarta.persistence.*;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+@Entity
+public class Supplier {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    @Column(nullable = false)
+    private String name;
+    @Column(nullable = false)
+    private int license;
+
+    @OneToMany(fetch = FetchType.EAGER, mappedBy = "supplier",  cascade = CascadeType.REMOVE)
+    private List<Orders> orders;
+
+    public Supplier(){}
+
+    public Supplier( String name, int license) {
+        this.name = name;
+        this.license = license;
+        orders = new ArrayList<>();
+    }
+
+    public Long getId() { return id; }
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getLicense() {
+        return license;
+    }
+
+    public void setLicense(int license) {
+        this.license = license;
+    }
+
+    public List<Orders> getOrders() {
+        return orders;
+    }
+
+    public void setOrders(List<Orders> orders) {
+        this.orders = orders;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Supplier supplier = (Supplier) o;
+        return Objects.equals(id, supplier.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Product{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", license='" + license + '\'' +
+                '}';
+    }
+}

demo/src/main/java/com/example/demo/supply/services/OrderService.java

@@ -0,0 +1,86 @@
+package com.example.demo.supply.services;
+
+import com.example.demo.supply.models.Orders;
+import com.example.demo.supply.models.Product;
+import com.example.demo.supply.models.Supplier;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityNotFoundException;
+import jakarta.persistence.PersistenceContext;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.sql.Date;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+@Service
+public class OrderService {
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional
+    public Orders addOrder(Supplier supplier){
+        if (supplier == null || em.find(Supplier.class, supplier.getId()) == null) {
+            throw new IllegalArgumentException("invalid supplier");
+        }
+        final Orders order = new Orders(new Date(System.currentTimeMillis()));
+        order.setSupplier(supplier);
+        em.persist(order);
+        return order;
+    }
+
+    //поставщики, у которых есть заказ на конкретный товар или несколько товаров
+    @Transactional
+    public List<Supplier> suppliers(List<Product> products){
+        return em.createQuery("SELECT distinct o.supplier FROM Orders o join Product p where p in (:products) ", Supplier.class)
+                .setParameter("products", products).getResultList();
+    }
+
+    @Transactional
+    public Orders addProduct(Long id, Product product) {
+        if (product == null) {
+            throw new IllegalArgumentException("empty product");
+        }
+        final Orders currentOrder = findOrder(id);
+        currentOrder.addProduct(product);
+        return em.merge(currentOrder);
+    }
+
+    @Transactional(readOnly = true)
+    public Orders findOrder(Long id) {
+        final Orders order = em.find(Orders.class, id);
+
+        if (order == null) {
+            throw new EntityNotFoundException(String.format("Order with id [%s] is not found", id));
+        }
+        return order;
+    }
+
+    @Transactional(readOnly = true)
+    public List<Orders> findAllOrders() {
+        return em.createQuery("select o from Orders o", Orders.class).getResultList();
+    }
+
+    @Transactional
+    public Orders updateOrder(Long id, Date date) {
+        final Orders currentOrder = findOrder(id);
+        currentOrder.setDateOfOrder(date);
+        return em.merge(currentOrder);
+    }
+
+    @Transactional
+    public Orders deleteOrder(Long id) {
+        final Orders currentOrder = findOrder(id);
+        em.remove(currentOrder);
+        return currentOrder;
+    }
+
+    @Transactional
+    public void deleteAll(){
+        em.createQuery("delete from Orders ").executeUpdate();
+    }
+}

demo/src/main/java/com/example/demo/supply/services/ProductService.java

@@ -0,0 +1,64 @@
+package com.example.demo.supply.services;
+
+import com.example.demo.supply.models.Product;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityNotFoundException;
+import jakarta.persistence.PersistenceContext;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.StringUtils;
+
+import java.util.List;
+
+@Service
+public class ProductService {
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional
+    public Product addProduct(String name, double cost){
+        if(!StringUtils.hasText(name) || cost <= 0)
+            throw new IllegalArgumentException("Invalid name and/or cost");
+
+        final Product product = new Product(name, cost);
+        em.persist(product);
+        return product;
+    }
+
+    @Transactional(readOnly = true)
+    public Product findProduct(Long id) {
+        final Product product = em.find(Product.class, id);
+        if (product == null) {
+            throw new EntityNotFoundException(String.format("Product with id [%s] is not found", id));
+        }
+        return product;
+    }
+
+    @Transactional(readOnly = true)
+    public List<Product> findAllProducts() {
+        return em.createQuery("select p from Product p", Product.class).getResultList();
+    }
+
+    @Transactional
+    public Product updateProduct(Long id, String name, float cost) {
+        if (!StringUtils.hasText(name) || cost <= 0)
+            throw new IllegalArgumentException("Invalid name and/or cost");
+
+        final Product currentProduct = findProduct(id);
+        currentProduct.setName(name);
+        currentProduct.setCost(cost);
+        return em.merge(currentProduct);
+    }
+
+    @Transactional
+    public Product deleteProduct(Long id) {
+        final Product currentProduct = findProduct(id);
+        em.remove(currentProduct);
+        return currentProduct;
+    }
+
+    @Transactional
+    public void deleteAll(){
+        em.createQuery("delete from Product").executeUpdate();
+    }
+}

demo/src/main/java/com/example/demo/supply/services/SupplierService.java

@@ -0,0 +1,64 @@
+package com.example.demo.supply.services;
+
+import com.example.demo.supply.models.Supplier;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityNotFoundException;
+import jakarta.persistence.PersistenceContext;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.StringUtils;
+
+import java.util.List;
+
+@Service
+public class SupplierService {
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional
+    public Supplier addSupplier(String name, int license){
+        if(!StringUtils.hasText(name) || license < 0)
+            throw new IllegalArgumentException("Invalid name and/or license");
+
+        final Supplier supplier = new Supplier(name, license);
+        em.persist(supplier);
+        return supplier;
+    }
+
+    @Transactional(readOnly = true)
+    public Supplier findSupplier(Long id) {
+        final Supplier supplier = em.find(Supplier.class, id);
+        if (supplier == null) {
+            throw new EntityNotFoundException(String.format("Supplier with id [%s] is not found", id));
+        }
+        return supplier;
+    }
+
+    @Transactional(readOnly = true)
+    public List<Supplier> findAllSuppliers() {
+        return em.createQuery("select s from Supplier s", Supplier.class).getResultList();
+    }
+
+    @Transactional
+    public Supplier updateSupplier(Long id, String name, int license) {
+        if (!StringUtils.hasText(name) || license < 0)
+            throw new IllegalArgumentException("Invalid name and/or license");
+
+        final Supplier currentSupplier = findSupplier(id);
+        currentSupplier.setName(name);
+        currentSupplier.setLicense(license);
+        return em.merge(currentSupplier);
+    }
+
+    @Transactional
+    public Supplier deleteSupplier(Long id) {
+        final Supplier currentSupplier = findSupplier(id);
+        em.remove(currentSupplier);
+        return currentSupplier;
+    }
+
+    @Transactional
+    public void deleteAll(){
+        em.createQuery("delete from Supplier").executeUpdate();
+    }
+}

demo/src/main/resources/application.properties

@@ -0,0 +1,9 @@
+spring.datasource.url=jdbc:h2:file:./data
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=password
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.jpa.hibernate.ddl-auto=update
+spring.h2.console.enabled=true
+spring.h2.console.settings.trace=false
+spring.h2.console.settings.web-allow-others=false

demo/src/test/java/com/example/demo/Tests.java

@@ -0,0 +1,84 @@
+package com.example.demo;
+
+import com.example.demo.supply.models.Orders;
+import com.example.demo.supply.models.Product;
+import com.example.demo.supply.models.Supplier;
+import com.example.demo.supply.services.OrderService;
+import com.example.demo.supply.services.ProductService;
+import com.example.demo.supply.services.SupplierService;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@SpringBootTest
+public class Tests {
+    @Autowired
+    private ProductService productService;
+    @Autowired
+    private OrderService orderService;
+    @Autowired
+    private SupplierService supplierService;
+
+    @Test
+    public void testOrder(){
+        orderService.deleteAll();
+        productService.deleteAll();
+        supplierService.deleteAll();
+
+        final Product product1 = productService.addProduct("Huawei Band 3", 2000.13);
+        final Product product2 = productService.addProduct("Samsung A2", 22000.56);
+
+        final Supplier supplier = supplierService.addSupplier("SuperSupplier", 325453);
+        Orders order = orderService.addOrder(supplierService.findSupplier(supplier.getId()));
+        order = orderService.addProduct(order.getId(), product1);
+        order = orderService.addProduct(order.getId(), product2);
+        final Orders order2 = orderService.findOrder(order.getId());
+        Assertions.assertEquals(order, order2);
+        orderService.deleteAll();
+        productService.deleteAll();
+        supplierService.deleteAll();
+    }
+
+    @Test
+    public void test(){
+        orderService.deleteAll();
+        productService.deleteAll();
+        supplierService.deleteAll();
+
+
+
+        final Product product1 = productService.addProduct("Huawei Band 3", 2000.13);
+        final Product product2 = productService.addProduct("Samsung A2", 22000.56);
+        final Product product3 = productService.addProduct("Redmond f3", 2000.13);
+        final Product product4 = productService.addProduct("Asus red9", 22000.56);
+
+
+        final Supplier supplier1 = supplierService.addSupplier("SuperSupplier1", 325453);
+        final Supplier supplier2 = supplierService.addSupplier("SuperSupplier2", 545455);
+        final Supplier supplier3 = supplierService.addSupplier("SuperSupplier3", 122122);
+
+        Orders order1 = orderService.addOrder(supplierService.findSupplier(supplier1.getId()));
+        orderService.addProduct(order1.getId(), product1);
+        orderService.addProduct(order1.getId(), product2);
+
+        Orders order2 = orderService.addOrder(supplierService.findSupplier(supplier2.getId()));
+        orderService.addProduct(order2.getId(), product3);
+
+        Orders order3 = orderService.addOrder(supplierService.findSupplier(supplier1.getId()));
+        orderService.addProduct(order3.getId(), product3);
+        orderService.addProduct(order3.getId(), product4);
+
+        List<Product> products = new ArrayList<>();
+        products.add(productService.findProduct(product3.getId()));
+        List<Supplier> suppliers = orderService.suppliers(products);
+        Assertions.assertEquals(suppliers.size(), 2);
+
+        orderService.deleteAll();
+        productService.deleteAll();
+        supplierService.deleteAll();
+    }
+}

front/index.html

@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html lang="ru">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>App</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
+  </head>
+  <body>
+    <div class="container">
+      <form class="mx-2 d-flex flex-column align-items-center text-center">
+        <div>
+            Первый объект
+            <input id="first" class="form-control" type='number' value='0' />
+        </div>
+        <div>
+            Операция
+            <select class="form-select" id="operation">
+                <option value="1">+</option>
+                <option value="2">-</option>
+                <option value="3">*</option>
+                <option value="4">/</option>
+            </select>
+        </div>
+        <div>
+            Второй объект
+            <input id="second" class="form-control" type='number' value='0' />
+        </div>
+        <div>
+            <button type="button" class="btn btn-primary my-2" id="intButton">Integer</button>
+        </div>
+        <div>
+            <button type="button" class="btn btn-primary mb-2" id="strButton">String</button>
+        </div>
+        <div>
+            Результат:
+            <p id="result"> </p>
+        </div>
+    </form>
+
+    </div>
+    <script type="module" src="./index.js"></script>
+  </body>
+</html>

front/index.js

@@ -0,0 +1,46 @@
+const intButton = document.getElementById("intButton");
+const strButton = document.getElementById("strButton");
+const first = document.getElementById("first");
+const second = document.getElementById("second");
+const operation = document.getElementById("operation");
+const result = document.getElementById("result");
+
+
+intButton.onclick = () => {
+    method("int");
+};
+strButton.onclick = () => {
+    method("str");
+};
+
+function method(parametr) {
+    switch (parseInt(operation.value)) {
+        case 1:
+            get("summa", parametr)
+            break;
+        case 2:
+            get("min", parametr)
+            break;
+        case 3:
+            get("multi", parametr)
+            break;
+        case 4:
+            get("div", parametr)
+            break;
+    };
+}
+
+function checkNum(res) {
+    if (res.indexOf(".") != -1) 
+        return parseInt(res)
+    else
+        return res
+}
+
+function get(address, type) {
+    console.log("Тип " + type)
+    
+    fetch(`http://localhost:8080/${address}?first=${first.value}&second=${second.value}&type=${type}`)
+        .then(response => response.text())
+        .then(res => result.innerHTML = res);
+}

front/package-lock.json

@@ -0,0 +1,759 @@
+{
+	"name": "front",
+	"version": "1.0.0",
+	"lockfileVersion": 2,
+	"requires": true,
+	"packages": {
+		"": {
+			"name": "front",
+			"version": "1.0.0",
+			"devDependencies": {
+				"http-server": "14.1.1 "
+			}
+		},
+		"node_modules/ansi-styles": {
+			"version": "4.3.0",
+			"resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+			"integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+			"dev": true,
+			"dependencies": {
+				"color-convert": "^2.0.1"
+			},
+			"engines": {
+				"node": ">=8"
+			},
+			"funding": {
+				"url": "https://github.com/chalk/ansi-styles?sponsor=1"
+			}
+		},
+		"node_modules/async": {
+			"version": "2.6.4",
+			"resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+			"integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
+			"dev": true,
+			"dependencies": {
+				"lodash": "^4.17.14"
+			}
+		},
+		"node_modules/basic-auth": {
+			"version": "2.0.1",
+			"resolved": "https://registry.npmjs.org/basic-auth/-/basic-auth-2.0.1.tgz",
+			"integrity": "sha512-NF+epuEdnUYVlGuhaxbbq+dvJttwLnGY+YixlXlME5KpQ5W3CnXA5cVTneY3SPbPDRkcjMbifrwmFYcClgOZeg==",
+			"dev": true,
+			"dependencies": {
+				"safe-buffer": "5.1.2"
+			},
+			"engines": {
+				"node": ">= 0.8"
+			}
+		},
+		"node_modules/call-bind": {
+			"version": "1.0.2",
+			"resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.2.tgz",
+			"integrity": "sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==",
+			"dev": true,
+			"dependencies": {
+				"function-bind": "^1.1.1",
+				"get-intrinsic": "^1.0.2"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/ljharb"
+			}
+		},
+		"node_modules/chalk": {
+			"version": "4.1.2",
+			"resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+			"integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+			"dev": true,
+			"dependencies": {
+				"ansi-styles": "^4.1.0",
+				"supports-color": "^7.1.0"
+			},
+			"engines": {
+				"node": ">=10"
+			},
+			"funding": {
+				"url": "https://github.com/chalk/chalk?sponsor=1"
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+		},
+		"node_modules/color-convert": {
+			"version": "2.0.1",
+			"resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+			"integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+			"dev": true,
+			"dependencies": {
+				"color-name": "~1.1.4"
+			},
+			"engines": {
+				"node": ">=7.0.0"
+			}
+		},
+		"node_modules/color-name": {
+			"version": "1.1.4",
+			"resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+			"integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+			"dev": true
+		},
+		"node_modules/corser": {
+			"version": "2.0.1",
+			"resolved": "https://registry.npmjs.org/corser/-/corser-2.0.1.tgz",
+			"integrity": "sha512-utCYNzRSQIZNPIcGZdQc92UVJYAhtGAteCFg0yRaFm8f0P+CPtyGyHXJcGXnffjCybUCEx3FQ2G7U3/o9eIkVQ==",
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+			"engines": {
+				"node": ">= 0.4.0"
+			}
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+			"integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
+			"dev": true,
+			"dependencies": {
+				"ms": "^2.1.1"
+			}
+		},
+		"node_modules/eventemitter3": {
+			"version": "4.0.7",
+			"resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.7.tgz",
+			"integrity": "sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw==",
+			"dev": true
+		},
+		"node_modules/follow-redirects": {
+			"version": "1.15.2",
+			"resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.15.2.tgz",
+			"integrity": "sha512-VQLG33o04KaQ8uYi2tVNbdrWp1QWxNNea+nmIB4EVM28v0hmP17z7aG1+wAkNzVq4KeXTq3221ye5qTJP91JwA==",
+			"dev": true,
+			"funding": [
+				{
+					"type": "individual",
+					"url": "https://github.com/sponsors/RubenVerborgh"
+				}
+			],
+			"engines": {
+				"node": ">=4.0"
+			},
+			"peerDependenciesMeta": {
+				"debug": {
+					"optional": true
+				}
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+		},
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+			"version": "1.1.1",
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+			"integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
+			"dev": true
+		},
+		"node_modules/get-intrinsic": {
+			"version": "1.2.0",
+			"resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.2.0.tgz",
+			"integrity": "sha512-L049y6nFOuom5wGyRc3/gdTLO94dySVKRACj1RmJZBQXlbTMhtNIgkWkUHq+jYmZvKf14EW1EoJnnjbmoHij0Q==",
+			"dev": true,
+			"dependencies": {
+				"function-bind": "^1.1.1",
+				"has": "^1.0.3",
+				"has-symbols": "^1.0.3"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/ljharb"
+			}
+		},
+		"node_modules/has": {
+			"version": "1.0.3",
+			"resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
+			"integrity": "sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==",
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+			"dependencies": {
+				"function-bind": "^1.1.1"
+			},
+			"engines": {
+				"node": ">= 0.4.0"
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+			"integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+			"dev": true,
+			"engines": {
+				"node": ">=8"
+			}
+		},
+		"node_modules/has-symbols": {
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+}

front/package.json

@@ -0,0 +1,20 @@
+{
+	"name": "interface_project",
+	"private": true,
+	"version": "0.0.0",
+	"type": "module",
+	"scripts": {
+		"dev": "./node_modules/.bin/vite",
+		"build": "./node_modules/.bin/vite build",
+		"preview": "./node_modules/.bin/vite preview"
+	},
+	"devDependencies": {
+		"vite": "^4.1.0"
+	  },	
+	  "dependencies": {
+		"ajax": "^0.0.4",
+		"axios": "^1.3.2",
+		"bootstrap": "5.2.1",
+		"@fortawesome/fontawesome-free": "6.2.0"
+	  }
+}