Chain Of Responsibility

src/main/java/com/dongho/df/domain/behavioral/chain_of_responsibility/ResultSet.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility;
+
+public class ResultSet {
+
+    private String value;
+
+    public ResultSet(String value) {
+        this.value = value;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+}

src/main/java/com/dongho/df/domain/behavioral/chain_of_responsibility/handler/AnchorChainHandler.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility.handler;
+
+import com.dongho.df.domain.behavioral.chain_of_responsibility.ResultSet;
+import com.dongho.df.domain.behavioral.chain_of_responsibility.request.Request;
+import com.dongho.df.domain.behavioral.chain_of_responsibility.request.RequestType;
+
+public class AnchorChainHandler extends ChainHandler {
+
+    @Override
+    public ResultSet handleRequest(Request request) {
+        if (request.getRequestType().equals(RequestType.ANCHOR_CLICK)) {
+            return new ResultSet(RequestType.ANCHOR_CLICK.name());
+        }
+        return delegateRequest(request);
+    }
+}

src/main/java/com/dongho/df/domain/behavioral/chain_of_responsibility/handler/ButtonChainHandler.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility.handler;
+
+import com.dongho.df.domain.behavioral.chain_of_responsibility.ResultSet;
+import com.dongho.df.domain.behavioral.chain_of_responsibility.request.Request;
+import com.dongho.df.domain.behavioral.chain_of_responsibility.request.RequestType;
+
+public class ButtonChainHandler extends ChainHandler {
+
+    @Override
+    public ResultSet handleRequest(Request request) {
+        if (request.getRequestType().equals(RequestType.BUTTON_CLICK)) {
+            return new ResultSet(RequestType.BUTTON_CLICK.name());
+        }
+        return delegateRequest(request);
+    }
+
+}

src/main/java/com/dongho/df/domain/behavioral/chain_of_responsibility/handler/ChainHandler.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility.handler;
+
+import com.dongho.df.domain.behavioral.chain_of_responsibility.ResultSet;
+import com.dongho.df.domain.behavioral.chain_of_responsibility.request.Request;
+
+public abstract class ChainHandler {
+
+    private ChainHandler chainHandler = null;
+
+    public abstract ResultSet handleRequest(Request request);
+
+    public void linkDelegator(ChainHandler handler) {
+        chainHandler = handler;
+    }
+
+    protected ResultSet delegateRequest(Request request) {
+        if (chainHandler == null) {
+            return new ResultSet("");
+        }
+
+        return chainHandler.handleRequest(request);
+    }
+
+}

src/main/java/com/dongho/df/domain/behavioral/chain_of_responsibility/request/AnchorRequest.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility.request;
+
+public class AnchorRequest implements Request {
+
+    @Override
+    public RequestType getRequestType() {
+        return RequestType.ANCHOR_CLICK;
+    }
+
+}

src/main/java/com/dongho/df/domain/behavioral/chain_of_responsibility/request/ButtonRequest.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility.request;
+
+public class ButtonRequest implements Request {
+
+    @Override
+    public RequestType getRequestType() {
+        return RequestType.BUTTON_CLICK;
+    }
+
+}

src/main/java/com/dongho/df/domain/behavioral/chain_of_responsibility/request/LinkRequest.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility.request;
+
+public class LinkRequest implements Request {
+
+    @Override
+    public RequestType getRequestType() {
+        return RequestType.LINK_CLICK;
+    }
+
+}

src/main/java/com/dongho/df/domain/behavioral/chain_of_responsibility/request/Request.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility.request;
+
+public interface Request {
+
+    RequestType getRequestType();
+
+}

src/main/java/com/dongho/df/domain/behavioral/chain_of_responsibility/request/RequestType.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility.request;
+
+public enum RequestType {
+
+    BUTTON_CLICK,
+    ANCHOR_CLICK,
+    LINK_CLICK
+
+}

src/test/java/com/dongho/df/domain/behavioral/chain_of_responsibility/ChainOfResponsibilityTest.java

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+package com.dongho.df.domain.behavioral.chain_of_responsibility;
+
+import com.dongho.df.domain.behavioral.chain_of_responsibility.handler.AnchorChainHandler;
+import com.dongho.df.domain.behavioral.chain_of_responsibility.handler.ButtonChainHandler;
+import com.dongho.df.domain.behavioral.chain_of_responsibility.handler.ChainHandler;
+import com.dongho.df.domain.behavioral.chain_of_responsibility.request.*;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(JUnit4.class)
+public class ChainOfResponsibilityTest {
+
+    private ChainHandler root;
+
+    @Before
+    public void before() {
+        ChainHandler buttonChainHandler = new ButtonChainHandler();
+        ChainHandler anchorChainHandler = new AnchorChainHandler();
+
+        buttonChainHandler.linkDelegator(anchorChainHandler);
+        root = buttonChainHandler;
+    }
+
+
+    @Test
+    public void buttonClickRequestTest() {
+        Request request;
+        ResultSet resultSet;
+
+        given: {
+            request = new ButtonRequest();
+        }
+
+        when: {
+            resultSet = root.handleRequest(request);
+        }
+
+        then: {
+            assertThat(resultSet.getValue()).isEqualTo(RequestType.BUTTON_CLICK.name());
+        }
+    }
+
+
+    @Test
+    public void anchorClickRequest() {
+        Request request;
+        ResultSet resultSet;
+
+        given: {
+            request = new AnchorRequest();
+        }
+
+        when: {
+            resultSet = root.handleRequest(request);
+        }
+
+        then: {
+            assertThat(resultSet.getValue()).isEqualTo(RequestType.ANCHOR_CLICK.name());
+        }
+    }
+
+
+    @Test
+    public void linkClickRequestDefault() {
+        Request request;
+        ResultSet resultSet;
+
+        given: {
+            request = new LinkRequest();
+        }
+
+        when: {
+            resultSet = root.handleRequest(request);
+        }
+
+        then: {
+            assertThat(resultSet.getValue()).isEqualTo("");
+        }
+    }
+
+
+}