INT-2218 - Chain Parser Validation Improvements

Components within Chain: Add parser validation

For reference see: https://jira.springsource.org/browse/INT-2218

INT-2218 - Code review changes

INT-2218 - Fix HttpOutboundGatewayParserTests

INT-2218 - Remove input-channel validation

Was already covered by PR #592

spring-integration-http/src/test/java/org/springframework/integration/http/config/ChainElementsTests.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2002-2012 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.http.config;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import java.io.ByteArrayInputStream;
+import java.util.Properties;
+
+import org.junit.Test;
+import org.springframework.beans.factory.config.PropertiesFactoryBean;
+import org.springframework.beans.factory.parsing.BeanDefinitionParsingException;
+import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.GenericApplicationContext;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.InputStreamResource;
+
+
+/**
+ * @author Gunnar Hillert
+ * @since 2.2
+ */
+public class ChainElementsTests {
+
+	@Test
+	public void chainOutboundGateway() throws Exception {
+
+		try {
+			this.bootStrap("http-oubound-gateway");
+			fail("Expected a BeanDefinitionParsingException to be thrown.");
+		}
+		catch (BeanDefinitionParsingException e) {
+			final String expectedMessage = "Configuration problem: The " +
+					"'request-channel' attribute isn't allowed for a nested " +
+					"(e.g. inside a <chain/>) endpoint element: 'int-http:outbound-gateway'.";
+			final String actualMessage = e.getMessage();
+			assertTrue("Error message did not start with '" + expectedMessage +
+					"' but instead returned: '" + actualMessage + "'", actualMessage.startsWith(expectedMessage));
+		}
+
+	}
+
+	private ApplicationContext bootStrap(String configProperty) throws Exception {
+		PropertiesFactoryBean pfb = new PropertiesFactoryBean();
+		pfb.setLocation(new ClassPathResource("org/springframework/integration/http/config/chain-elements-config.properties"));
+		pfb.afterPropertiesSet();
+		Properties prop = pfb.getObject();
+		StringBuffer buffer = new StringBuffer();
+		buffer.append(prop.getProperty("xmlheaders")).append(prop.getProperty(configProperty)).append(prop.getProperty("xmlfooter"));
+		ByteArrayInputStream stream = new ByteArrayInputStream(buffer.toString().getBytes());
+		GenericApplicationContext ac = new GenericApplicationContext();
+		XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(ac);
+		reader.setValidationMode(XmlBeanDefinitionReader.VALIDATION_XSD);
+		reader.loadBeanDefinitions(new InputStreamResource(stream));
+		ac.refresh();
+		return ac;
+	}
+
+}

spring-integration-http/src/test/java/org/springframework/integration/http/config/chain-elements-config.properties

@@ -0,0 +1,15 @@
+xmlheaders=\
+<?xml version="1.0" encoding="UTF-8"?> \
+<beans xmlns="http://www.springframework.org/schema/beans" \
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" \
+	xmlns:int="http://www.springframework.org/schema/integration" \
+	xmlns:int-http="http://www.springframework.org/schema/integration/http" \
+	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd \
+		http://www.springframework.org/schema/integration/http http://www.springframework.org/schema/integration/http/spring-integration-http.xsd \
+		http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd">
+xmlfooter= </beans>
+
+http-oubound-gateway=<int:chain id="httpChain" input-channel="httpOutboundGatewayInsideChain" output-channel="nullChannel">\
+		<int-http:outbound-gateway request-channel="requestChannel" url="http://google.com/" http-method="POST"/>\
+	</int:chain>
+