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samujjwaalsamujjwaal
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Added State and Template Method
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2 files changed

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‎src/main/java/com/behavioral/state/state.java

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package com.behavioral.state;
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import com.squareup.javapoet.*;
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import javax.lang.model.element.Modifier;
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public class state {
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public static void main(String[] args) {
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String input1 = "State";
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String input2 = "ConcreteState";
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String input3 = "Context";
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String packageName = "com.BehavioralDP.state";
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// State interface declaration
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ClassName State = ClassName.get("",input1);
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MethodSpec handle = MethodSpec.methodBuilder("handle")
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.addModifiers(Modifier.PUBLIC,Modifier.ABSTRACT)
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.returns(TypeName.VOID)
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.build();
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TypeSpec state = TypeSpec.interfaceBuilder(State)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("""
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The interface for encapsulating the behavior associated with a particular
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state of the Context.""")
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.addMethod(handle)
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.build();
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JavaFile class1 = JavaFile.builder(packageName,state)
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.skipJavaLangImports(true)
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.build();
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// ConcreteState class declaration
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ClassName ConcreteState = ClassName.get("",input2);
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FieldSpec handleInv = FieldSpec.builder(TypeName.BOOLEAN,"handleInvoked")
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.addModifiers(Modifier.PRIVATE)
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.initializer("false")
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.build();
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TypeSpec concreteState = TypeSpec.classBuilder(ConcreteState)
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.addSuperinterface(State)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("""
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ConcreteState implements a behavior associated with a state of the Context.""")
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.addField(handleInv)
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.addMethod(MethodSpec.methodBuilder(handle.name)
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.addModifiers(Modifier.PUBLIC)
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.returns(TypeName.VOID)
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.addStatement("this.$N = true",handleInv.name)
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.build())
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.addMethod(MethodSpec.methodBuilder("isHandleInvoked")
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.addModifiers(Modifier.PROTECTED)
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.returns(TypeName.BOOLEAN)
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.addStatement("return $N", handleInv)
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.build())
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.build();
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JavaFile class2 = JavaFile.builder(packageName,concreteState)
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.skipJavaLangImports(true)
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.build();
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// Context class declaration
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ClassName Context = ClassName.get("",input3);
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TypeSpec context = TypeSpec.classBuilder(Context)
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.addModifiers(Modifier.PUBLIC)
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.addJavadoc("""
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Context maintains an instance of a ConcreteState subclass that defines the
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current state.""")
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.addField(ConcreteState, "state",Modifier.PRIVATE)
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.addMethod(MethodSpec.methodBuilder("request")
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.addModifiers(Modifier.PUBLIC)
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.addStatement("$N.$N()","state",handle.name)
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.build())
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.addMethod(MethodSpec.methodBuilder("setState")
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.addModifiers(Modifier.PUBLIC)
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.returns(TypeName.VOID)
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.addParameter(State, "state")
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.addStatement("this.$N = state", "state")
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.build())
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.build();
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JavaFile class3 = JavaFile.builder(packageName,context)
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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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}
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}

‎src/main/java/com/behavioral/templateMethod/templateMethod.java

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package com.behavioral.templateMethod;
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import com.squareup.javapoet.*;
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import javax.lang.model.element.Modifier;
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public class templateMethod {
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public static void main(String[] args) {
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String input1 = "AbstractClass";
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String input2 = "ConcreteClass";
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String packageName = "com.BehavioralDP.templateMethod";
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ClassName abstractclass = ClassName.get("",input1);
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ClassName concreteclass = ClassName.get("",input2);
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// AbstractClass declaration
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MethodSpec primOp1 = MethodSpec.methodBuilder("primitiveOperation1")
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.addModifiers(Modifier.ABSTRACT)
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.returns(String.class)
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.build();
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MethodSpec primOp2 = MethodSpec.methodBuilder("primitiveOperation2")
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.addModifiers(Modifier.ABSTRACT)
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.returns(String.class)
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.build();
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TypeSpec abstractC = TypeSpec.classBuilder(abstractclass)
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.addModifiers(Modifier.ABSTRACT)
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.addJavadoc("Defines interfaces for primitive operations. Implements algorithm.")
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.addMethod(MethodSpec.methodBuilder("templateMethod")
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.addModifiers(Modifier.PUBLIC)
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.returns(String.class)
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.addJavadoc("""
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Template method, implementation of algorithm which consists of
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primitiveOperations
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@return result of the primitive operations""")
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.addStatement("return this.$N() + this.$N()",primOp1.name,primOp2.name)
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.build())
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.addMethod(primOp1)
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.addMethod(primOp2)
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.build();
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JavaFile javaFile1 = JavaFile.builder(packageName,abstractC)
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.skipJavaLangImports(true)
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.build();
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// ConcreteClass declaration
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TypeSpec concreteC = TypeSpec.classBuilder(concreteclass)
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.superclass(abstractclass)
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.addJavadoc("""
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Implements the primitive operations to carry out subclass-specific steps of
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the algorithm.""")
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.addModifiers(Modifier.PUBLIC)
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.addMethod(MethodSpec.methodBuilder(primOp1.name)
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.addModifiers(Modifier.PUBLIC)
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.returns(String.class)
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.addStatement("return $S","Template")
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.build())
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.addMethod(MethodSpec.methodBuilder(primOp2.name)
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.addModifiers(Modifier.PUBLIC)
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.returns(String.class)
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.addStatement("return $S","Method")
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.build())
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.build();
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JavaFile javaFile2 = JavaFile.builder(packageName,concreteC)
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.skipJavaLangImports(true)
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.build();
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System.out.println(javaFile1);
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System.out.println(javaFile2);
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}
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}

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