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Commit3fe20e3

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Merge pull requestTheAlgorithms#1186 from ali4j/Development
Decorator pattern Implementation
2 parents5ec13c6 +78f7a80 commit3fe20e3

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6 files changed

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6 files changed

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packagecom.designpatterns.structural.decorator;
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importjava.io.ByteArrayOutputStream;
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importjava.io.IOException;
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importjava.io.OutputStream;
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importjava.util.zip.GZIPOutputStream;
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/**
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* this is one of the concrete decorators
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*/
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publicclassCompressingDecoratorextendsSenderDecorator {
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publicCompressingDecorator(Sendersender) {
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super(sender);
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}
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@Override
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publicStringsend(Stringcontent) {
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byte[]compressedBytes =compressContent(content);
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StringcompressedContent =newString(compressedBytes);
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super.send(compressedContent);
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returncompressedContent;
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}
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privatebyte[]compressContent(Stringcontent) {
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try (ByteArrayOutputStreambaostream =newByteArrayOutputStream();
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OutputStreamoutStream =newGZIPOutputStream(baostream)){
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outStream.write(content.getBytes());
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outStream.close();
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returnbaostream.toByteArray();
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}catch (IOExceptione) {
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thrownewRuntimeException("exception happened while compressing email content");
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}
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}
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}
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packagecom.designpatterns.structural.decorator;
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/**
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* this is the class which should be decorated without any modification
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*/
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publicclassEmailSenderimplementsSender {
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@Override
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publicStringsend(Stringcontent) {
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System.out.println("sending\"" +content +"\" as email");
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returncontent;
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}
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}
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packagecom.designpatterns.structural.decorator;
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importjava.util.Base64;
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/**
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* this is another concrete decorator.
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*/
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publicclassEncodingDecoratorextendsSenderDecorator {
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publicEncodingDecorator(Sendersender) {
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super(sender);
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}
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@Override
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publicStringsend(Stringcontent) {
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StringencodedContent =encodeContent(content);
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super.send(encodedContent);
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returnencodedContent;
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}
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privateStringencodeContent(Stringcontent){
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returnBase64.getEncoder().encodeToString(content.getBytes());
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}
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}
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packagecom.designpatterns.structural.decorator;
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publicinterfaceSender {
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Stringsend(Stringcontent);
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}
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packagecom.designpatterns.structural.decorator;
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/**
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* this is the base decorator.
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*/
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publicclassSenderDecoratorimplementsSender {
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privateSendersender;
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publicSenderDecorator(Sendersender) {
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this.sender =sender;
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}
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@Override
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publicStringsend(Stringcontent) {
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returnthis.sender.send(content);
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}
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}
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packagecom.designpatterns.decorator;
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importcom.designpatterns.structural.decorator.*;
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importorg.junit.jupiter.api.Assertions;
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importorg.junit.jupiter.api.Test;
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importjava.util.Base64;
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publicclassDecoratorDemo {
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@Test
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publicvoidtestDecorator_sendEmailAsPlainText() {
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Stringmessage ="test message";
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EmailSendersender =newEmailSender();
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Stringcontent =sender.send(message);
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Assertions.assertEquals(content,message);
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}
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@Test
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publicvoidtestDecorator_sendEmailAsEncodedText() {
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Stringmessage ="test message";
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Sendersender =newSenderDecorator(
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newEncodingDecorator(
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newEmailSender()
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)
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);
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StringencodedContent =sender.send(message);
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Assertions.assertEquals(
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newString(Base64.getDecoder().decode (encodedContent)),
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message
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);
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}
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@Test
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publicvoidtestDecorator_sendEmailAsCompressedText() {
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Stringmessage ="Java is a general-purpose programming language that is class-based, object-oriented, and designed to have as few implementation dependencies as possible. It is intended to let application developers write once, run anywhere (WORA),[15] meaning that compiled Java code can run on all platforms that support Java without the need for recompilation.[16] Java applications are typically compiled to bytecode that can run on any Java virtual machine (JVM) regardless of the underlying computer architecture. The syntax of Java is similar to C and C++, but it has fewer low-level facilities than either of them. As of 2019, Java was one of the most popular programming languages in use according to GitHub,[17][18] particularly for client-server web applications, with a reported 9 million developers.";
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Sendersender =newSenderDecorator(
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newCompressingDecorator(
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newEmailSender()
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)
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);
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StringcompressedContent =sender.send(message);
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Assertions.assertTrue(message.length()>=compressedContent.length());
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}
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@Test
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publicvoidtestDecorator_sendEmailAsEncodedCompressedText() {
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Stringmessage ="Java is a general-purpose programming language that is class-based, object-oriented, and designed to have as few implementation dependencies as possible. It is intended to let application developers write once, run anywhere (WORA),[15] meaning that compiled Java code can run on all platforms that support Java without the need for recompilation.[16] Java applications are typically compiled to bytecode that can run on any Java virtual machine (JVM) regardless of the underlying computer architecture. The syntax of Java is similar to C and C++, but it has fewer low-level facilities than either of them. As of 2019, Java was one of the most popular programming languages in use according to GitHub,[17][18] particularly for client-server web applications, with a reported 9 million developers.";
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Sendersender =newSenderDecorator(
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newEncodingDecorator(
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newCompressingDecorator(
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newEmailSender()
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)
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)
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);
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StringencodedCompressedContent =sender.send(message);
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StringdecodedCompressed =newString(Base64.getDecoder().decode (encodedCompressedContent));
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Assertions.assertTrue(message.length()>=decodedCompressed.length());
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}
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}

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