INTSAMPLES-19 Add Filter Example

basic/testing-examples/src/main/java/org/springframework/integration/samples/testing/filter/PetFilter.java

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+/*
+ * Copyright 2002-2011 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.integration.samples.testing.filter;
+
+import org.springframework.integration.annotation.Filter;
+
+/**
+ * @author Gary Russell
+ * @since 2.0.2
+ *
+ */
+public class PetFilter {
+	
+	@Filter
+	public boolean dogsOnly(String input) {
+		return input.toLowerCase().contains("dog");
+	}
+
+}

basic/testing-examples/src/main/resources/META-INF/spring/integration/06-filter/integration-context.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<beans:beans xmlns="http://www.springframework.org/schema/integration"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:beans="http://www.springframework.org/schema/beans"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans
+			http://www.springframework.org/schema/beans/spring-beans.xsd
+			http://www.springframework.org/schema/integration
+			http://www.springframework.org/schema/integration/spring-integration.xsd">
+
+	<channel id="inputChannel"/>
+
+	<filter input-channel="inputChannel"
+		output-channel="outputChannel">
+		<beans:bean class="org.springframework.integration.samples.testing.filter.PetFilter"/>
+	</filter>
+	
+	<channel id="outputChannel"/>
+	
+</beans:beans>

basic/testing-examples/src/test/java/org/springframework/integration/samples/testing/filter/PetFilterTests-context.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<beans:beans xmlns="http://www.springframework.org/schema/integration"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:beans="http://www.springframework.org/schema/beans"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans
+			http://www.springframework.org/schema/beans/spring-beans.xsd
+			http://www.springframework.org/schema/integration
+			http://www.springframework.org/schema/integration/spring-integration.xsd">
+
+	<beans:import resource="classpath:META-INF/spring/integration/06-filter/integration-context.xml" />
+	
+	<bridge input-channel="outputChannel"
+		output-channel="testChannel"/>
+		
+	<channel id="testChannel">
+		<queue/>
+	</channel>
+	
+</beans:beans>

basic/testing-examples/src/test/java/org/springframework/integration/samples/testing/filter/PetFilterTests.java

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+/*
+ * Copyright 2002-2011 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.integration.samples.testing.filter;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.integration.Message;
+import org.springframework.integration.MessageChannel;
+import org.springframework.integration.channel.QueueChannel;
+import org.springframework.integration.support.MessageBuilder;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+
+/**
+ * 
+ * Shows how to test a router; the router is configured to route to direct
+ * channel names. The configuration would
+ * be a fragment of a larger flow. Since the output channels are direct,
+ * they have no subscribers outside the context of a larger flow. So, 
+ * in this test case, we bridge them to {@link QueueChannel}s to
+ * facilitate easy testing.
+ * 
+ * @author Gary Russell
+ * @since 2.0.2
+ */
+@ContextConfiguration	// default context name is <ClassName>-context.xml
+@RunWith(SpringJUnit4ClassRunner.class)
+public class PetFilterTests {
+	
+	@Autowired
+	MessageChannel inputChannel;
+	
+	@Autowired
+	QueueChannel testChannel;
+
+	@Test
+	public void unitTestClassCat() {
+		String payload = "CAT:Fluffy";
+		assertFalse(new PetFilter().dogsOnly(payload));
+	}
+	
+	@Test
+	public void unitTestClassDog() {
+		String payload = "DOG:Fido";
+		assertTrue(new PetFilter().dogsOnly(payload));
+	}
+	
+	@Test
+	public void unitTestClassLizard() {
+		String payload = "LIZARD:Scaly";
+		assertFalse(new PetFilter().dogsOnly(payload));
+	}
+	
+	@Test
+	public void testCat() {
+		String payload = "CAT:Fluffy";
+		Message<String> message = MessageBuilder.withPayload(payload).build();
+		inputChannel.send(message);
+		Message<?> outMessage = testChannel.receive(0);
+		assertNull("Expected no output message", outMessage);
+	}
+
+	@Test
+	public void testDog() {
+		String payload = "DOG:Fido";
+		Message<String> message = MessageBuilder.withPayload(payload).build();
+		inputChannel.send(message);
+		Message<?> outMessage = testChannel.receive(0);
+		assertNotNull("Expected an output message", outMessage);
+		assertEquals(payload, outMessage.getPayload());
+	}
+
+	@Test
+	public void testLizard() {
+		String payload = "LIZARD:Scaly";
+		Message<String> message = MessageBuilder.withPayload(payload).build();
+		inputChannel.send(message);
+		Message<?> outMessage = testChannel.receive(0);
+		assertNull("Expected no output message", outMessage);
+	}
+	
+}