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| 1 | +package com.creational.builder; |
| 2 | + |
| 3 | +import com.squareup.javapoet.*; |
| 4 | +import javax.lang.model.element.Modifier; |
| 5 | + |
| 6 | +public class builder { |
| 7 | + |
| 8 | + public static void main(String[] args) { |
| 9 | + |
| 10 | + String input1 = "Builder"; |
| 11 | + String input2 = "Director"; |
| 12 | + String input3 = "Product"; |
| 13 | + String input4 = "concreteBuilder"; |
| 14 | + |
| 15 | + String packageName = "com.CreationalDP.builder"; |
| 16 | + |
| 17 | +// Abstract Builder class declaration |
| 18 | + ClassName Builder = ClassName.get("",input1); |
| 19 | + |
| 20 | + MethodSpec createProduct = MethodSpec.methodBuilder("createProduct") |
| 21 | + .addModifiers(Modifier.PUBLIC,Modifier.ABSTRACT) |
| 22 | + .returns(Builder) |
| 23 | + .build(); |
| 24 | + |
| 25 | + MethodSpec buildPart1 = MethodSpec.methodBuilder("buildPart1") |
| 26 | + .addModifiers(Modifier.PUBLIC,Modifier.ABSTRACT) |
| 27 | + .returns(Builder) |
| 28 | + .addParameter(String.class, "part") |
| 29 | + .build(); |
| 30 | + |
| 31 | + MethodSpec buildPart2 = MethodSpec.methodBuilder("buildPart2") |
| 32 | + .addModifiers(Modifier.PUBLIC,Modifier.ABSTRACT) |
| 33 | + .returns(Builder) |
| 34 | + .addParameter(String.class, "part") |
| 35 | + .build(); |
| 36 | + |
| 37 | + TypeSpec builder = TypeSpec.classBuilder(Builder) |
| 38 | + .addModifiers(Modifier.ABSTRACT) |
| 39 | + .addJavadoc("Builder, declares interface for creating parts of a Product object") |
| 40 | +// .addStaticBlock(CodeBlock.of("\n//Builder, declares interface for creating parts of a Product object")) |
| 41 | + .addMethod(createProduct) |
| 42 | + .addMethod(buildPart1) |
| 43 | + .addMethod(buildPart2) |
| 44 | + .build(); |
| 45 | + |
| 46 | + JavaFile javaFile1 = JavaFile.builder(packageName,builder) |
| 47 | + .addFileComment("Builder, declares interface for creating parts of a Product object") |
| 48 | + .skipJavaLangImports(true) |
| 49 | + .build(); |
| 50 | + |
| 51 | +// Director class declaration |
| 52 | + |
| 53 | + ClassName Director = ClassName.get("",input2); |
| 54 | + |
| 55 | + MethodSpec constructorDirector = MethodSpec.constructorBuilder() |
| 56 | + .addModifiers(Modifier.PUBLIC) |
| 57 | + .addParameter(Builder,"builder") |
| 58 | + .addStatement("this.builder = builder") |
| 59 | + .build(); |
| 60 | + |
| 61 | + MethodSpec construct = MethodSpec.methodBuilder("construct") |
| 62 | + .addModifiers(Modifier.PUBLIC) |
| 63 | + .returns(TypeName.VOID) |
| 64 | + .addStatement("builder.$N().$N($S).$N($S)",createProduct.name,buildPart1.name,"part1",buildPart2.name,"part2") |
| 65 | + .build(); |
| 66 | + |
| 67 | + TypeSpec director = TypeSpec.classBuilder(Director) |
| 68 | + .addModifiers(Modifier.PUBLIC) |
| 69 | + .addJavadoc("Director class, constructs an object using the Builder interface") |
| 70 | + .addField(Builder,"builder",Modifier.PRIVATE) |
| 71 | + .addMethod(constructorDirector) |
| 72 | + .addMethod(construct) |
| 73 | + .build(); |
| 74 | + |
| 75 | + JavaFile javaFile2 = JavaFile.builder(packageName,director) |
| 76 | +// .addFileComment("Builder, declares interface for creating parts of a Product object") |
| 77 | + .skipJavaLangImports(true) |
| 78 | + .build(); |
| 79 | + |
| 80 | +// Product class declaration |
| 81 | + |
| 82 | + ClassName Product = ClassName.get("",input3); |
| 83 | + |
| 84 | + MethodSpec set1 = MethodSpec.methodBuilder("setPart1") |
| 85 | + .addModifiers(Modifier.PUBLIC) |
| 86 | + .returns(TypeName.VOID) |
| 87 | + .addParameter(String.class,"part1") |
| 88 | + .addStatement("this.$N() = $N","part1","part1") |
| 89 | + .build(); |
| 90 | + |
| 91 | + MethodSpec set2 = MethodSpec.methodBuilder("setPart2") |
| 92 | + .addModifiers(Modifier.PUBLIC) |
| 93 | + .returns(TypeName.VOID) |
| 94 | + .addParameter(String.class,"part2") |
| 95 | + .addStatement("this.$N() = $N","part2","part2") |
| 96 | + .build(); |
| 97 | + |
| 98 | + MethodSpec get1 = MethodSpec.methodBuilder("getPart1") |
| 99 | + .addModifiers(Modifier.PUBLIC) |
| 100 | + .returns(String.class) |
| 101 | + .addStatement("return $N","part1") |
| 102 | + .build(); |
| 103 | + |
| 104 | + MethodSpec get2 = MethodSpec.methodBuilder("getPart2") |
| 105 | + .addModifiers(Modifier.PUBLIC) |
| 106 | + .returns(String.class) |
| 107 | + .addStatement("return $N","part2") |
| 108 | + .build(); |
| 109 | + |
| 110 | + TypeSpec product = TypeSpec.classBuilder(Product) |
| 111 | + .addModifiers(Modifier.PUBLIC) |
| 112 | + .addJavadoc("Product class, represents complex object") |
| 113 | + .addField(String.class, "part1", Modifier.PRIVATE) |
| 114 | + .addField(String.class, "part2", Modifier.PRIVATE) |
| 115 | + .addMethod(set1) |
| 116 | + .addMethod(set2) |
| 117 | + .addMethod(get1) |
| 118 | + .addMethod(get2) |
| 119 | + .build(); |
| 120 | + |
| 121 | + JavaFile javaFile3 = JavaFile.builder(packageName,product) |
| 122 | +// .addFileComment("Builder, declares interface for creating parts of a Product object") |
| 123 | + .skipJavaLangImports(true) |
| 124 | + .build(); |
| 125 | + |
| 126 | +// Concrete Builder class declaration |
| 127 | + |
| 128 | + ClassName concreteBuilder = ClassName.get("",input4); |
| 129 | + |
| 130 | + MethodSpec createproduct = MethodSpec.methodBuilder("createProduct") |
| 131 | + .addModifiers(Modifier.PUBLIC) |
| 132 | + .returns(Builder) |
| 133 | + .addStatement("this.product = new $T()",Product) |
| 134 | + .addStatement("return this") |
| 135 | + .build(); |
| 136 | + |
| 137 | + MethodSpec buildpart1 = MethodSpec.methodBuilder("buildPart1") |
| 138 | + .addModifiers(Modifier.PUBLIC) |
| 139 | + .returns(Builder) |
| 140 | + .addParameter(String.class,"part" ) |
| 141 | + .addStatement("product.$N($N)",set1.name,"part") |
| 142 | + .addStatement("return this") |
| 143 | + .build(); |
| 144 | + |
| 145 | + MethodSpec buildpart2 = MethodSpec.methodBuilder("buildPart2") |
| 146 | + .addModifiers(Modifier.PUBLIC) |
| 147 | + .returns(Builder) |
| 148 | + .addParameter(String.class,"part" ) |
| 149 | + .addStatement("product.$N($N)",set2.name,"part") |
| 150 | + .addStatement("return this") |
| 151 | + .build(); |
| 152 | + |
| 153 | + MethodSpec getresult = MethodSpec.methodBuilder("getResult") |
| 154 | + .addModifiers(Modifier.PUBLIC) |
| 155 | + .returns(Product) |
| 156 | + .addStatement("return product") |
| 157 | + .build(); |
| 158 | + |
| 159 | + TypeSpec concretebuilder = TypeSpec.classBuilder(concreteBuilder) |
| 160 | + .superclass(Builder) |
| 161 | + .addModifiers(Modifier.PUBLIC) |
| 162 | + .addJavadoc(""" |
| 163 | + ConcreteBuilder class, constructs and assembles parts of the Product by |
| 164 | + implementing the Builder interface""") |
| 165 | + .addField(Product, "product", Modifier.PRIVATE) |
| 166 | + .addMethod(createproduct) |
| 167 | + .addMethod(buildpart1) |
| 168 | + .addMethod(buildpart2) |
| 169 | + .addMethod(getresult) |
| 170 | + .build(); |
| 171 | + |
| 172 | + JavaFile javaFile4 = JavaFile.builder(packageName,concretebuilder) |
| 173 | +// .addFileComment("Builder, declares interface for creating parts of a Product object") |
| 174 | + .skipJavaLangImports(true) |
| 175 | + .build(); |
| 176 | + |
| 177 | + System.out.println(javaFile1); |
| 178 | + System.out.println(javaFile2); |
| 179 | + System.out.println(javaFile3); |
| 180 | + System.out.println(javaFile4); |
| 181 | + } |
| 182 | +} |
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