diff --git a/demo/.gitattributes b/demo/.gitattributes new file mode 100644 index 0000000..8af972c --- /dev/null +++ b/demo/.gitattributes @@ -0,0 +1,3 @@ +/gradlew text eol=lf +*.bat text eol=crlf +*.jar binary diff --git a/demo/.gitignore b/demo/.gitignore new file mode 100644 index 0000000..c2065bc --- /dev/null +++ b/demo/.gitignore @@ -0,0 +1,37 @@ +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/ diff --git a/demo/build.gradle b/demo/build.gradle new file mode 100644 index 0000000..187c2a9 --- /dev/null +++ b/demo/build.gradle @@ -0,0 +1,31 @@ +plugins { + id 'java' + id 'org.springframework.boot' version '4.0.6' + id 'io.spring.dependency-management' version '1.1.7' +} + +group = 'com.restapi' +version = '0.0.1-SNAPSHOT' + +java { + toolchain { + languageVersion = JavaLanguageVersion.of(25) + } +} + +repositories { + mavenCentral() +} + +dependencies { + implementation 'org.springframework.boot:spring-boot-starter-validation' + implementation 'org.springframework.boot:spring-boot-starter-webmvc' + developmentOnly 'org.springframework.boot:spring-boot-devtools' + testImplementation 'org.springframework.boot:spring-boot-starter-validation-test' + testImplementation 'org.springframework.boot:spring-boot-starter-webmvc-test' + testRuntimeOnly 'org.junit.platform:junit-platform-launcher' +} + +tasks.named('test') { + useJUnitPlatform() +} diff --git a/demo/gradle/wrapper/gradle-wrapper.jar b/demo/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000..d997cfc Binary files /dev/null and b/demo/gradle/wrapper/gradle-wrapper.jar differ diff --git a/demo/gradle/wrapper/gradle-wrapper.properties b/demo/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..c61a118 --- /dev/null +++ b/demo/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,7 @@ +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip +networkTimeout=10000 +validateDistributionUrl=true +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/demo/gradlew b/demo/gradlew new file mode 100755 index 0000000..739907d --- /dev/null +++ b/demo/gradlew @@ -0,0 +1,248 @@ +#!/bin/sh + +# +# Copyright © 2015 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. +# +# SPDX-License-Identifier: Apache-2.0 +# + +############################################################################## +# +# 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/2d6327017519d23b96af35865dc997fcb544fb40/platforms/jvm/plugins-application/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 + +# This is normally unused +# shellcheck disable=SC2034 +APP_BASE_NAME=${0##*/} +# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036) +APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit + +# 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 "$( uname )" in #( + CYGWIN* ) cygwin=true ;; #( + Darwin* ) darwin=true ;; #( + MSYS* | MINGW* ) msys=true ;; #( + NONSTOP* ) nonstop=true ;; +esac + + + +# Determine the Java command to use to start the JVM. +if [ -n "$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: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD=java + if ! command -v java >/dev/null 2>&1 + then + die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +fi + +# Increase the maximum file descriptors if we can. +if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then + case $MAX_FD in #( + max*) + # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked. + # shellcheck disable=SC2039,SC3045 + MAX_FD=$( ulimit -H -n ) || + warn "Could not query maximum file descriptor limit" + esac + case $MAX_FD in #( + '' | soft) :;; #( + *) + # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked. + # shellcheck disable=SC2039,SC3045 + ulimit -n "$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 "$APP_HOME" ) + + JAVACMD=$( 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 + + +# 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"' + +# Collect all arguments for the java command: +# * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments, +# and any embedded shellness will be escaped. +# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be +# treated as '${Hostname}' itself on the command line. + +set -- \ + "-Dorg.gradle.appname=$APP_BASE_NAME" \ + -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \ + "$@" + +# Stop when "xargs" is not available. +if ! command -v xargs >/dev/null 2>&1 +then + die "xargs is not available" +fi + +# Use "xargs" to parse quoted args. +# +# With -n1 it outputs one arg per line, with the quotes and backslashes removed. +# +# In Bash we could simply go: +# +# readarray ARGS < <( xargs -n1 <<<"$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 "$JAVACMD" "$@" diff --git a/demo/gradlew.bat b/demo/gradlew.bat new file mode 100644 index 0000000..c4bdd3a --- /dev/null +++ b/demo/gradlew.bat @@ -0,0 +1,93 @@ +@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 +@rem SPDX-License-Identifier: Apache-2.0 +@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=. +@rem This is normally unused +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. 1>&2 +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2 +echo. 1>&2 +echo Please set the JAVA_HOME variable in your environment to match the 1>&2 +echo location of your Java installation. 1>&2 + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto execute + +echo. 1>&2 +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2 +echo. 1>&2 +echo Please set the JAVA_HOME variable in your environment to match the 1>&2 +echo location of your Java installation. 1>&2 + +goto fail + +:execute +@rem Setup the command line + + + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %* + +: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 diff --git a/demo/settings.gradle b/demo/settings.gradle new file mode 100644 index 0000000..0a383dd --- /dev/null +++ b/demo/settings.gradle @@ -0,0 +1 @@ +rootProject.name = 'demo' diff --git a/demo/src/main/java/com/restapi/demo/DemoApplication.java b/demo/src/main/java/com/restapi/demo/DemoApplication.java new file mode 100644 index 0000000..60780c4 --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/DemoApplication.java @@ -0,0 +1,13 @@ +package com.restapi.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); + } + +} diff --git a/demo/src/main/java/com/restapi/demo/controller/CustomerController.java b/demo/src/main/java/com/restapi/demo/controller/CustomerController.java new file mode 100644 index 0000000..5ef6703 --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/controller/CustomerController.java @@ -0,0 +1,64 @@ +package com.restapi.demo.controller; + +import com.restapi.demo.model.Customer; +import com.restapi.demo.service.CustomerService; +import jakarta.validation.Valid; +import org.springframework.http.HttpStatus; +import org.springframework.http.ResponseEntity; +import org.springframework.web.bind.annotation.*; + +import java.util.List; + +@RestController +@RequestMapping("/customers") +public class CustomerController { + + private final CustomerService customerService; + + // Constructor injection + public CustomerController(CustomerService customerService) { + this.customerService = customerService; + } + + // POST /customers - Create new customer + @PostMapping + public ResponseEntity createCustomer( + @RequestHeader("API-Key") String apiKey, + @Valid @RequestBody Customer customer) { + Customer created = customerService.addCustomer(customer); + return ResponseEntity.status(HttpStatus.CREATED).body(created); + } + + // GET /customers - Get all customers + @GetMapping + public ResponseEntity> getAllCustomers( + @RequestHeader("API-Key") String apiKey) { + return ResponseEntity.ok(customerService.getAllCustomers()); + } + + // GET /customers/{email} - Get customer by email + @GetMapping("/{email}") + public ResponseEntity getCustomerByEmail( + @RequestHeader("API-Key") String apiKey, + @PathVariable String email) { + return ResponseEntity.ok(customerService.getCustomerByEmail(email)); + } + + // PUT /customers/{email} - Update customer + @PutMapping("/{email}") + public ResponseEntity updateCustomer( + @RequestHeader("API-Key") String apiKey, + @PathVariable String email, + @Valid @RequestBody Customer customer) { + return ResponseEntity.ok(customerService.updateCustomer(email, customer)); + } + + // DELETE /customers/{email} - Delete customer + @DeleteMapping("/{email}") + public ResponseEntity deleteCustomer( + @RequestHeader("API-Key") String apiKey, + @PathVariable String email) { + customerService.deleteCustomer(email); + return ResponseEntity.ok("Customer with email '" + email + "' deleted successfully"); + } +} \ No newline at end of file diff --git a/demo/src/main/java/com/restapi/demo/controller/ProductController.java b/demo/src/main/java/com/restapi/demo/controller/ProductController.java new file mode 100644 index 0000000..60c774e --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/controller/ProductController.java @@ -0,0 +1,81 @@ +package com.restapi.demo.controller; + +import com.restapi.demo.model.Product; +import com.restapi.demo.service.ProductService; +import jakarta.validation.Valid; +import org.springframework.http.HttpStatus; +import org.springframework.http.ResponseEntity; +import org.springframework.web.bind.annotation.*; + +import java.util.List; + +@RestController +@RequestMapping("/products") +public class ProductController { + + private final ProductService productService; + + // Constructor injection + public ProductController(ProductService productService) { + this.productService = productService; + } + + // POST /products - Create new product + @PostMapping + public ResponseEntity createProduct( + @RequestHeader("API-Key") String apiKey, + @Valid @RequestBody Product product) { + Product created = productService.addProduct(product); + return ResponseEntity.status(HttpStatus.CREATED).body(created); + } + + // GET /products - Get all products + @GetMapping + public ResponseEntity> getAllProducts( + @RequestHeader("API-Key") String apiKey) { + return ResponseEntity.ok(productService.getAllProducts()); + } + + // GET /products/{name} - Get product by name + @GetMapping("/{name}") + public ResponseEntity getProductByName( + @RequestHeader("API-Key") String apiKey, + @PathVariable String name) { + return ResponseEntity.ok(productService.getProductByName(name)); + } + + // PUT /products/{name} - Update product + @PutMapping("/{name}") + public ResponseEntity updateProduct( + @RequestHeader("API-Key") String apiKey, + @PathVariable String name, + @Valid @RequestBody Product product) { + return ResponseEntity.ok(productService.updateProduct(name, product)); + } + + // DELETE /products/{name} - Delete product + @DeleteMapping("/{name}") + public ResponseEntity deleteProduct( + @RequestHeader("API-Key") String apiKey, + @PathVariable String name) { + productService.deleteProduct(name); + return ResponseEntity.ok("Product '" + name + "' deleted successfully"); + } + + // GET /products/category/{category} - Get products by category + @GetMapping("/category/{category}") + public ResponseEntity> getProductsByCategory( + @RequestHeader("API-Key") String apiKey, + @PathVariable String category) { + return ResponseEntity.ok(productService.getProductsByCategory(category)); + } + + // GET /products/price?min={min}&max={max} - Get products by price range + @GetMapping("/price") + public ResponseEntity> getProductsByPriceRange( + @RequestHeader("API-Key") String apiKey, + @RequestParam double min, + @RequestParam double max) { + return ResponseEntity.ok(productService.getProductsByPriceRange(min, max)); + } +} \ No newline at end of file diff --git a/demo/src/main/java/com/restapi/demo/exception/CustomerNotFoundException.java b/demo/src/main/java/com/restapi/demo/exception/CustomerNotFoundException.java new file mode 100644 index 0000000..404b0b5 --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/exception/CustomerNotFoundException.java @@ -0,0 +1,7 @@ +package com.restapi.demo.exception; + +public class CustomerNotFoundException extends RuntimeException { + public CustomerNotFoundException(String message) { + super(message); + } +} diff --git a/demo/src/main/java/com/restapi/demo/exception/GlobalExceptionHandler.java b/demo/src/main/java/com/restapi/demo/exception/GlobalExceptionHandler.java new file mode 100644 index 0000000..2412753 --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/exception/GlobalExceptionHandler.java @@ -0,0 +1,110 @@ +package com.restapi.demo.exception; + +import org.springframework.http.HttpStatus; +import org.springframework.http.ResponseEntity; +import org.springframework.web.bind.MethodArgumentNotValidException; +import org.springframework.web.bind.MissingRequestHeaderException; +import org.springframework.web.bind.annotation.ExceptionHandler; +import org.springframework.web.bind.annotation.RestControllerAdvice; + +import java.time.LocalDateTime; +import java.util.HashMap; +import java.util.LinkedHashMap; +import java.util.Map; + +@RestControllerAdvice +public class GlobalExceptionHandler { + + // Handle validation errors (@Valid failures) + @ExceptionHandler(MethodArgumentNotValidException.class) + public ResponseEntity> handleValidationErrors( + MethodArgumentNotValidException ex) { + + Map fieldErrors = new HashMap<>(); + ex.getBindingResult().getFieldErrors() + .forEach(error -> fieldErrors.put(error.getField(), error.getDefaultMessage())); + + Map response = buildResponse( + HttpStatus.BAD_REQUEST, + "Validation failed", + fieldErrors + ); + return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(response); + } + + // Handle missing API-Key header + @ExceptionHandler(MissingRequestHeaderException.class) + public ResponseEntity> handleMissingHeader( + MissingRequestHeaderException ex) { + + Map response = buildResponse( + HttpStatus.UNAUTHORIZED, + "Missing required header: " + ex.getHeaderName(), + null + ); + return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(response); + } + + // Handle product not found + @ExceptionHandler(ProductNotFoundException.class) + public ResponseEntity> handleProductNotFound( + ProductNotFoundException ex) { + + Map response = buildResponse( + HttpStatus.NOT_FOUND, + ex.getMessage(), + null + ); + return ResponseEntity.status(HttpStatus.NOT_FOUND).body(response); + } + + // Handle invalid price range + @ExceptionHandler(InvalidPriceRangeException.class) + public ResponseEntity> handleInvalidPriceRange( + InvalidPriceRangeException ex) { + + Map response = buildResponse( + HttpStatus.BAD_REQUEST, + ex.getMessage(), + null + ); + return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(response); + } + + // Handle customer not found + @ExceptionHandler(CustomerNotFoundException.class) + public ResponseEntity> handleCustomerNotFound( + CustomerNotFoundException ex) { + + Map response = buildResponse( + HttpStatus.NOT_FOUND, + ex.getMessage(), + null + ); + return ResponseEntity.status(HttpStatus.NOT_FOUND).body(response); + } + + // Generic fallback handler + @ExceptionHandler(Exception.class) + public ResponseEntity> handleGenericException(Exception ex) { + Map response = buildResponse( + HttpStatus.INTERNAL_SERVER_ERROR, + "An unexpected error occurred: " + ex.getMessage(), + null + ); + return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(response); + } + + // Helper to build a consistent error response body + private Map buildResponse(HttpStatus status, String message, Object errors) { + Map response = new LinkedHashMap<>(); + response.put("timestamp", LocalDateTime.now().toString()); + response.put("status", status.value()); + response.put("error", status.getReasonPhrase()); + response.put("message", message); + if (errors != null) { + response.put("errors", errors); + } + return response; + } +} diff --git a/demo/src/main/java/com/restapi/demo/exception/InvalidPriceRangeException.java b/demo/src/main/java/com/restapi/demo/exception/InvalidPriceRangeException.java new file mode 100644 index 0000000..548ff99 --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/exception/InvalidPriceRangeException.java @@ -0,0 +1,7 @@ +package com.restapi.demo.exception; + +public class InvalidPriceRangeException extends RuntimeException { + public InvalidPriceRangeException(String message) { + super(message); + } +} diff --git a/demo/src/main/java/com/restapi/demo/exception/ProductNotFoundException.java b/demo/src/main/java/com/restapi/demo/exception/ProductNotFoundException.java new file mode 100644 index 0000000..851806e --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/exception/ProductNotFoundException.java @@ -0,0 +1,7 @@ +package com.restapi.demo.exception; + +public class ProductNotFoundException extends RuntimeException { + public ProductNotFoundException(String message) { + super(message); + } +} diff --git a/demo/src/main/java/com/restapi/demo/model/Customer.java b/demo/src/main/java/com/restapi/demo/model/Customer.java new file mode 100644 index 0000000..fed59f8 --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/model/Customer.java @@ -0,0 +1,43 @@ +package com.restapi.demo.model; + +import jakarta.validation.constraints.Email; +import jakarta.validation.constraints.Min; +import jakarta.validation.constraints.NotBlank; + +public class Customer { + + @NotBlank(message = "Customer name must not be blank") + private String name; + + @NotBlank(message = "Email must not be blank") + @Email(message = "Email must be a valid email address") + private String email; + + @Min(value = 18, message = "Customer must be at least 18 years old") + private int age; + + @NotBlank(message = "Address must not be blank") + private String address; + + public Customer() {} + + public Customer(String name, String email, int age, String address) { + this.name = name; + this.email = email; + this.age = age; + this.address = address; + } + + // Getters and Setters + public String getName() { return name; } + public void setName(String name) { this.name = name; } + + public String getEmail() { return email; } + public void setEmail(String email) { this.email = email; } + + public int getAge() { return age; } + public void setAge(int age) { this.age = age; } + + public String getAddress() { return address; } + public void setAddress(String address) { this.address = address; } +} \ No newline at end of file diff --git a/demo/src/main/java/com/restapi/demo/model/Product.java b/demo/src/main/java/com/restapi/demo/model/Product.java new file mode 100644 index 0000000..8aad014 --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/model/Product.java @@ -0,0 +1,64 @@ +package com.restapi.demo.model; + +import jakarta.validation.constraints.NotBlank; +import jakarta.validation.constraints.Positive; +import jakarta.validation.constraints.Size; + +public class Product { + + @NotBlank(message = "Product name must not be blank") + @Size(min = 3, message = "Product name must be at least 3 characters") + private String name; + + @Positive(message = "Price must be a positive number") + private double price; + + @NotBlank(message = "Category must not be blank") + private String category; + + @Positive(message = "Quantity must be a positive number") + private int quantity; + + public Product() { + } + + public Product(String name, double price, String category, int quantity) { + this.name = name; + this.price = price; + this.category = category; + this.quantity = quantity; + } + + // Getters and Setters + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + public double getPrice() { + return price; + } + + public void setPrice(double price) { + this.price = price; + } + + public String getCategory() { + return category; + } + + public void setCategory(String category) { + this.category = category; + } + + public int getQuantity() { + return quantity; + } + + public void setQuantity(int quantity) { + this.quantity = quantity; + } +} \ No newline at end of file diff --git a/demo/src/main/java/com/restapi/demo/service/CustomerService.java b/demo/src/main/java/com/restapi/demo/service/CustomerService.java new file mode 100644 index 0000000..dfc637b --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/service/CustomerService.java @@ -0,0 +1,50 @@ +package com.restapi.demo.service; + +import com.restapi.demo.exception.CustomerNotFoundException; +import com.restapi.demo.model.Customer; +import org.springframework.stereotype.Service; + +import java.util.ArrayList; +import java.util.List; + +@Service +public class CustomerService { + + private final List customers = new ArrayList<>(); + + // Add a new customer + public Customer addCustomer(Customer customer) { + customers.add(customer); + return customer; + } + + // Get all customers + public List getAllCustomers() { + return new ArrayList<>(customers); + } + + // Get customer by email + public Customer getCustomerByEmail(String email) { + return customers.stream() + .filter(c -> c.getEmail().equalsIgnoreCase(email)) + .findFirst() + .orElseThrow(() -> new CustomerNotFoundException( + "Customer not found with email: " + email)); + } + + // Update customer + public Customer updateCustomer(String email, Customer updatedCustomer) { + Customer existing = getCustomerByEmail(email); + existing.setName(updatedCustomer.getName()); + existing.setEmail(updatedCustomer.getEmail()); + existing.setAge(updatedCustomer.getAge()); + existing.setAddress(updatedCustomer.getAddress()); + return existing; + } + + // Delete customer + public void deleteCustomer(String email) { + Customer customer = getCustomerByEmail(email); + customers.remove(customer); + } +} \ No newline at end of file diff --git a/demo/src/main/java/com/restapi/demo/service/ProductService.java b/demo/src/main/java/com/restapi/demo/service/ProductService.java new file mode 100644 index 0000000..d760ae6 --- /dev/null +++ b/demo/src/main/java/com/restapi/demo/service/ProductService.java @@ -0,0 +1,69 @@ +package com.restapi.demo.service; + +import com.restapi.demo.model.Product; +import org.springframework.stereotype.Service; + +import java.util.ArrayList; +import java.util.List; +import java.util.stream.Collectors; + +@Service +public class ProductService { + + private final List products = new ArrayList<>(); + + // Add a new product + public Product addProduct(Product product) { + products.add(product); + return product; + } + + // Get all products + public List getAllProducts() { + return new ArrayList<>(products); + } + + // Get product by name + public Product getProductByName(String name) { + return products.stream() + .filter(p -> p.getName().equalsIgnoreCase(name)) + .findFirst() + .orElseThrow(() -> new RuntimeException("Product not found with name: " + name)); + } + + // Update product + public Product updateProduct(String name, Product updatedProduct) { + Product existing = getProductByName(name); + existing.setName(updatedProduct.getName()); + existing.setPrice(updatedProduct.getPrice()); + existing.setCategory(updatedProduct.getCategory()); + existing.setQuantity(updatedProduct.getQuantity()); + return existing; + } + + // Delete product + public void deleteProduct(String name) { + Product product = getProductByName(name); + products.remove(product); + } + + // Get products by category + public List getProductsByCategory(String category) { + return products.stream() + .filter(p -> p.getCategory().equalsIgnoreCase(category)) + .collect(Collectors.toList()); + } + + // Get products by price range + public List getProductsByPriceRange(double min, double max) { + if (min < 0 || max < 0) { + throw new RuntimeException("Price values must not be negative"); + } + if (min > max) { + throw new RuntimeException("Minimum price must not be greater than maximum price"); + } + return products.stream() + .filter(p -> p.getPrice() >= min && p.getPrice() <= max) + .collect(Collectors.toList()); + } +} \ No newline at end of file diff --git a/demo/src/main/resources/application.properties b/demo/src/main/resources/application.properties new file mode 100644 index 0000000..2109a44 --- /dev/null +++ b/demo/src/main/resources/application.properties @@ -0,0 +1 @@ +spring.application.name=demo diff --git a/demo/src/test/java/com/restapi/demo/DemoApplicationTests.java b/demo/src/test/java/com/restapi/demo/DemoApplicationTests.java new file mode 100644 index 0000000..f0b97a2 --- /dev/null +++ b/demo/src/test/java/com/restapi/demo/DemoApplicationTests.java @@ -0,0 +1,13 @@ +package com.restapi.demo; + +import org.junit.jupiter.api.Test; +import org.springframework.boot.test.context.SpringBootTest; + +@SpringBootTest +class DemoApplicationTests { + + @Test + void contextLoads() { + } + +}