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samujjwaalsamujjwaal
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Added Command and Iterator
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‎src/main/java/com/behavioral/command/command.java‎

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package com.behavioral.command;
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import com.squareup.javapoet.*;
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import javax.lang.model.element.Modifier;
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public class command {
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public static void main(String[] args) {
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String input1 = "Command";
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String input2 = "Invoker";
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String input3 = "Receiver";
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String input4 = "ConcreteCommand";
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String packageName = "com.BehavioralDP.command";
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// Command interface declaration
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ClassName Command = ClassName.get("",input1);
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MethodSpec execute = MethodSpec.methodBuilder("execute")
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.addModifiers(Modifier.ABSTRACT,Modifier.PUBLIC)
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.returns(TypeName.VOID)
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.build();
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TypeSpec command = TypeSpec.interfaceBuilder(Command)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("""
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Command interface, declares an interface for executing an operation""")
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.addMethod(execute)
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.build();
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JavaFile class1 = JavaFile.builder(packageName,command)
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.skipJavaLangImports(true)
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.build();
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// Invoker class declaration
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ClassName Invoker = ClassName.get("",input2);
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TypeSpec invoker = TypeSpec.classBuilder(Invoker)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("""
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Invoker class, asks the command to carry out the request""")
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.addField(Command, "command", Modifier.PRIVATE)
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.addMethod(MethodSpec.constructorBuilder()
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.addModifiers(Modifier.PUBLIC)
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.addParameter(Command,"command")
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.addStatement("this.$N = command", "command")
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.build())
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.addMethod(MethodSpec.methodBuilder(execute.name)
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.addModifiers(Modifier.PUBLIC)
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.returns(TypeName.VOID)
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.addStatement("$N.$N()","command", execute.name)
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.build())
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.build();
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JavaFile class2 = JavaFile.builder(packageName,invoker)
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.skipJavaLangImports(true)
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.build();
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// Receiver class declaration
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ClassName Receiver = ClassName.get("",input3);
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FieldSpec opPerf = FieldSpec.builder(Boolean.TYPE,"operationPerfomed")
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.addModifiers(Modifier.PRIVATE)
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.initializer("false")
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.build();
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TypeSpec receiver = TypeSpec.classBuilder(Receiver)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("""
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Receiver class, knows how to perform the operations associated with carrying
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out a request""")
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.addField(opPerf)
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.addMethod(MethodSpec.methodBuilder("action")
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.addModifiers(Modifier.PUBLIC)
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.returns(TypeName.VOID)
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.addStatement("$N = true",opPerf.name)
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.build())
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.addMethod(MethodSpec.methodBuilder("isOperationPerfomed")
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.addModifiers(Modifier.PROTECTED)
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.returns(TypeName.BOOLEAN)
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.addStatement("return $N",opPerf.name)
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.build())
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.build();
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JavaFile class3 = JavaFile.builder(packageName,receiver)
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.skipJavaLangImports(true)
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.build();
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// ConcreteCommand class declaration
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ClassName ConcreteCommand = ClassName.get("",input4);
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TypeSpec concreteCommand = TypeSpec.classBuilder(ConcreteCommand)
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.addSuperinterface(Command)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("""
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ConcreteCommand class, defines a binding between a Receiver object and an
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operation""")
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.addField(Receiver, "receiver",Modifier.PRIVATE)
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.addMethod(MethodSpec.constructorBuilder()
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.addModifiers(Modifier.PUBLIC)
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.addParameter(Receiver, "receiver")
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.addStatement("this.$N = receiver","receiver")
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.build())
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.addMethod(MethodSpec.methodBuilder(execute.name)
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.addModifiers(Modifier.PUBLIC)
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.returns(TypeName.VOID)
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.addStatement("this.$N.$N()","receiver","action")
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.build())
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.build();
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JavaFile class4 = JavaFile.builder(packageName,concreteCommand)
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.skipJavaLangImports(true)
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.build();
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System.out.println(class1);
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System.out.println(class2);
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System.out.println(class3);
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System.out.println(class4);
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}
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}

‎src/main/java/com/behavioral/iterator/iterator.java‎

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package com.behavioral.iterator;
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import com.squareup.javapoet.*;
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import javax.lang.model.element.Modifier;
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public class iterator {
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public static void main(String[] args) {
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String input1 = "Iterator";
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String input2 = "Aggregate";
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String input3 = "ConcreteAggregate";
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String input4 = "ConcreteIterator";
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String packageName = "com.BehavioralDP.iterator";
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// Observer interface declaration
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ClassName Iterator = ClassName.get("",input1);
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ClassName ConcreteIterator = ClassName.get("",input4);
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MethodSpec first = MethodSpec.methodBuilder("first")
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.addModifiers(Modifier.PUBLIC,Modifier.ABSTRACT).returns(TypeName.OBJECT)
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.build();
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MethodSpec next = MethodSpec.methodBuilder("next")
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.addModifiers(Modifier.PUBLIC,Modifier.ABSTRACT).returns(TypeName.OBJECT)
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.build();
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MethodSpec isDone = MethodSpec.methodBuilder("isDone")
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.addModifiers(Modifier.PUBLIC,Modifier.ABSTRACT).returns(TypeName.BOOLEAN)
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.build();
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MethodSpec currentItem = MethodSpec.methodBuilder("currentItem")
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.addModifiers(Modifier.PUBLIC,Modifier.ABSTRACT).returns(TypeName.OBJECT)
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.build();
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TypeSpec iterator = TypeSpec.interfaceBuilder(Iterator)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("Iterator defines an interface for accessing and traversing elements.")
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.addMethod(first)
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.addMethod(next)
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.addMethod(isDone)
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.addMethod(currentItem)
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.build();
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JavaFile class1 = JavaFile.builder(packageName,iterator)
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.skipJavaLangImports(true)
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.build();
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// Aggregate interface declaration
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ClassName Aggregate = ClassName.get("",input2);
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MethodSpec createIterator = MethodSpec.methodBuilder("createIterator")
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.addModifiers(Modifier.PUBLIC,Modifier.ABSTRACT).returns(Iterator)
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.build();
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TypeSpec aggregate = TypeSpec.interfaceBuilder(Aggregate)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("Aggregate defines an interface for creating an Iterator object.")
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.addMethod(createIterator)
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.build();
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JavaFile class2 = JavaFile.builder(packageName,aggregate)
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.skipJavaLangImports(true)
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.build();
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// ConcreteAggregate class declaration
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ClassName ConcreteAggregate = ClassName.get("",input3);
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// String[] stringRecords = { "first", "second", "third", "fourth" };
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FieldSpec records = FieldSpec.builder(String[].class,"records",Modifier.FINAL,Modifier.PRIVATE)
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.initializer(" { \"first\", \"second\", \"third\", \"fourth\" }")
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.build();
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MethodSpec getRecords= MethodSpec.methodBuilder("getRecords")
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.addModifiers(Modifier.PROTECTED).returns(String[].class)
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.addStatement("return $N", records.name)
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.build();
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TypeSpec concreteAggregate = TypeSpec.classBuilder(ConcreteAggregate)
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.addSuperinterface(Aggregate)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("ConcreteAggregate implements the Iterator creation interface to return an instance of the proper ConcreteIterator.")
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.addField(records)
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.addMethod(MethodSpec.methodBuilder(createIterator.name)
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.addModifiers(Modifier.PUBLIC).returns(Iterator)
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.addStatement("return new $T(this)", ConcreteIterator)
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.build())
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.addMethod(getRecords)
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.build();
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JavaFile class3 = JavaFile.builder(packageName,concreteAggregate)
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.skipJavaLangImports(true).build();
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// ConcreteIterator class declaration
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FieldSpec concAgg = FieldSpec.builder(ConcreteAggregate,"concreteAggregate",Modifier.PRIVATE)
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.build();
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FieldSpec index = FieldSpec.builder(int.class,"index",Modifier.PRIVATE)
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.initializer("-1")
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.build();
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TypeSpec concreteIterator = TypeSpec.classBuilder(ConcreteIterator)
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.addSuperinterface(Iterator)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("ConcreteIterator implements the Iterator interface. Keeps track of the current position in the traversal of the aggregate.")
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.addField(concAgg)
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.addField(index)
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.addMethod(MethodSpec.constructorBuilder()
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.addModifiers(Modifier.PUBLIC)
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.addParameter(ConcreteAggregate, "concreteAggregate")
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.addStatement("this.$N = concreteAggregate",concAgg.name)
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.build())
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.addMethod(MethodSpec.methodBuilder(first.name)
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.addModifiers(Modifier.PUBLIC).returns(TypeName.OBJECT)
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.addStatement("$N = 0",index.name)
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.addStatement("return $N.$N()[$N]",concAgg.name,getRecords.name,index.name)
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.build())
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.addMethod(MethodSpec.methodBuilder(next.name)
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.addModifiers(Modifier.PUBLIC).returns(TypeName.OBJECT)
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.addStatement("$N++",index.name)
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.addStatement("return $N.$N()[$N]",concAgg.name,getRecords.name,index.name)
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.build())
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.addMethod(MethodSpec.methodBuilder(isDone.name)
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.addModifiers(Modifier.PUBLIC).returns(TypeName.BOOLEAN)
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.beginControlFlow("if ($N.$N().length == ($N + 1))",concAgg.name,getRecords.name,index.name)
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.addStatement("return true")
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.endControlFlow()
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.addStatement("return false")
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.build())
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.addMethod(MethodSpec.methodBuilder(currentItem.name)
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.addModifiers(Modifier.PUBLIC).returns(TypeName.OBJECT)
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.addStatement("return $N.$N()[$N]",concAgg.name,getRecords.name,index.name)
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.build())
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.build();
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JavaFile class4 = JavaFile.builder(packageName,concreteIterator)
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.skipJavaLangImports(true).build();
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System.out.println(class1);
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System.out.println(class2);
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System.out.println(class3);
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System.out.println(class4);
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}
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}

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