INTEXT-40 Add ZIP Transformer

* Add zip-transformer
* Add unzip-transformer
* Add UnZipResultSplitter
* Add sample

For reference see: https://jira.springsource.org/browse/INTEXT-40

samples/zip/src/main/java/org/springframework/integration/samples/zip/Main.java

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+/*
+ * Copyright 2015 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.zip;
+
+import java.util.Scanner;
+
+import org.apache.log4j.Logger;
+import org.springframework.context.support.AbstractApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+
+/**
+ * Starts the Spring Context and will initialize the Spring Integration routes.
+ *
+ * @author Gunnar Hillert
+ * @since 1.0
+ *
+ */
+public final class Main {
+
+	private static final Logger LOGGER = Logger.getLogger(Main.class);
+
+	private Main() { }
+
+	/**
+	 * Load the Spring Integration Application Context
+	 *
+	 * @param args - command line arguments
+	 */
+	public static void main(final String... args) {
+
+		if (LOGGER.isInfoEnabled()) {
+			LOGGER.info("\n========================================================="
+					  + "\n                                                         "
+					  + "\n    Welcome to the Spring Integration Zip Sample         "
+					  + "\n                                                         "
+					  + "\n    For more information please visit:                   "
+					  + "\n    http://www.springsource.org/spring-integration       "
+					  + "\n                                                         "
+					  + "\n=========================================================" );
+		}
+
+		final AbstractApplicationContext context =
+				new ClassPathXmlApplicationContext("classpath:META-INF/spring/integration/*-context.xml");
+
+		context.registerShutdownHook();
+
+		SpringIntegrationUtils.displayDirectories(context);
+
+		final Scanner scanner = new Scanner(System.in);
+
+		if (LOGGER.isInfoEnabled()) {
+			LOGGER.info("\n========================================================="
+					  + "\n                                                         "
+					  + "\n    Please press 'q + Enter' to quit the application.    "
+					  + "\n                                                         "
+					  + "\n=========================================================" );
+		}
+
+		while (!scanner.hasNext("q")) {
+			//Do nothing unless user presses 'q' to quit.
+		}
+
+		if (LOGGER.isInfoEnabled()) {
+			LOGGER.info("Exiting application...bye.");
+		}
+
+		System.exit(0);
+
+	}
+}

samples/zip/src/main/java/org/springframework/integration/samples/zip/SpringIntegrationUtils.java

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+/*
+ * Copyright 2015 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.zip;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.springframework.beans.DirectFieldAccessor;
+import org.springframework.context.ApplicationContext;
+import org.springframework.expression.Expression;
+import org.springframework.integration.file.FileReadingMessageSource;
+import org.springframework.integration.file.FileWritingMessageHandler;
+
+/**
+ * Displays the names of the input and output directories.
+ *
+ * @author Gunnar Hillert
+ * @since 1.0
+ *
+ */
+public final class SpringIntegrationUtils {
+
+	private static final Log logger = LogFactory.getLog(SpringIntegrationUtils.class);
+
+	private SpringIntegrationUtils() { }
+
+	/**
+	 * Helper Method to dynamically determine and display input and output
+	 * directories as defined in the Spring Integration context.
+	 *
+	 * @param context Spring Application Context
+	 */
+	public static void displayDirectories(final ApplicationContext context) {
+
+		final Map<String, FileReadingMessageSource> fileReadingMessageSources = context.getBeansOfType(FileReadingMessageSource.class);
+
+		final List<String> inputDirectories = new ArrayList<String>();
+
+		for (FileReadingMessageSource source : fileReadingMessageSources.values()) {
+			final File inDir = (File) new DirectFieldAccessor(source).getPropertyValue("directory");
+			inputDirectories.add(inDir.getAbsolutePath());
+		}
+
+
+		final Map<String, FileWritingMessageHandler> fileWritingMessageHandlers = context.getBeansOfType(FileWritingMessageHandler.class);
+
+		final List<String> outputDirectories = new ArrayList<String>();
+
+		for (final FileWritingMessageHandler messageHandler : fileWritingMessageHandlers.values()) {
+			final Expression outDir = (Expression) new DirectFieldAccessor(messageHandler).getPropertyValue("destinationDirectoryExpression");
+			outputDirectories.add(outDir.getExpressionString());
+		}
+
+		final StringBuilder stringBuilder = new StringBuilder();
+
+		stringBuilder.append("\n=========================================================");
+		stringBuilder.append("\n");
+
+		for (final String inputDirectory : inputDirectories) {
+			stringBuilder.append("\n    Intput directory is: '" + inputDirectory + "'");
+		}
+
+		for (final String outputDirectory : outputDirectories) {
+			stringBuilder.append("\n    Output directory is: '" + outputDirectory + "'");
+		}
+
+		stringBuilder.append("\n\n=========================================================");
+
+		logger.info(stringBuilder.toString());
+
+	}
+
+}

samples/zip/src/main/java/org/springframework/integration/samples/zip/TransformationHandler.java

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+/*
+ * Copyright 2015 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.zip;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Locale;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.io.FilenameUtils;
+import org.springframework.integration.annotation.Transformer;
+import org.springframework.integration.file.FileHeaders;
+import org.springframework.integration.support.MessageBuilder;
+import org.springframework.messaging.Message;
+
+/**
+ * This Spring Integration transformation handler takes the input file, converts
+ * the file into a string, converts the file contents into an upper-case string
+ * and then sets a few Spring Integration message headers.
+ *
+ * @author Gunnar Hillert
+ * @since 1.0
+ */
+public class TransformationHandler {
+
+	/**
+	 * Actual Spring Integration transformation handler.
+	 *
+	 * @param inputMessage Spring Integration input message
+	 * @return New Spring Integration message with updated headers
+	 */
+	@Transformer
+	public Message<String> handleFile(final Message<File> inputMessage) {
+
+		final File inputFile = inputMessage.getPayload();
+		final String filename = inputFile.getName();
+		final String fileExtension = FilenameUtils.getExtension(filename);
+
+		final String inputAsString;
+
+		try {
+			inputAsString = FileUtils.readFileToString(inputFile);
+		} catch (IOException e) {
+			throw new IllegalStateException(e);
+		}
+
+		final Message<String> message = MessageBuilder.withPayload(inputAsString.toUpperCase(Locale.ENGLISH))
+					.setHeader(FileHeaders.FILENAME,      filename)
+					.setHeader(FileHeaders.ORIGINAL_FILE, inputFile)
+					.setHeader("file_size", inputFile.length())
+					.setHeader("file_extension", fileExtension)
+					.build();
+
+		return message;
+	}
+}

samples/zip/src/main/resources/META-INF/spring/integration/spring-integration-context.xml

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+<?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-file="http://www.springframework.org/schema/integration/file"
+	xmlns:int-zip="http://www.springframework.org/schema/integration/zip"
+	xsi:schemaLocation="http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
+		http://www.springframework.org/schema/integration/file http://www.springframework.org/schema/integration/file/spring-integration-file.xsd
+		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/integration/zip http://www.springframework.org/schema/integration/zip/spring-integration-zip.xsd">
+
+	<int-file:inbound-channel-adapter id="zipFilesIn"
+		directory="file:input-zip">
+		<int:poller id="poller" fixed-rate="5000" max-messages-per-poll="10" />
+	</int-file:inbound-channel-adapter>
+
+	<int-file:inbound-channel-adapter id="uncompressedFilesIn" directory="file:input-uncompressed">
+		<int:poller id="poller" fixed-rate="5000" max-messages-per-poll="10" />
+	</int-file:inbound-channel-adapter>
+
+	<int-zip:zip-transformer id="zipFiles" input-channel="uncompressedFilesIn"
+		output-channel="zipFilesOut" />
+
+	<int:chain id="unzipFiles" input-channel="zipFilesIn" output-channel="decompressedFilesOut">
+		<int-zip:unzip-transformer result-type="BYTE_ARRAY"/>
+		<int:splitter method="splitUnzippedMap">
+			<bean class="org.springframework.integration.zip.transformer.splitter.UnZipResultSplitter"/>
+		</int:splitter>
+	</int:chain>
+
+	<int-file:outbound-channel-adapter
+		id="decompressedFilesOut" directory="file:target/output/decompressedFilesOut"
+		delete-source-files="true" />
+
+	<int-file:outbound-channel-adapter
+		id="zipFilesOut" directory="file:target/output/zipFilesOut"
+		delete-source-files="true" />
+
+</beans>

samples/zip/src/main/resources/log4j.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
+<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
+
+	<!-- Appenders -->
+	<appender name="console" class="org.apache.log4j.ConsoleAppender">
+		<param name="Target" value="System.out" />
+		<layout class="org.apache.log4j.PatternLayout">
+			<param name="ConversionPattern" value="%d{HH:mm:ss.SSS} %-5p [%t][%c] %m%n" />
+		</layout>
+	</appender>
+
+	<!-- Loggers -->
+	<logger name="org.springframework.integration">
+		<level value="warn" />
+	</logger>
+
+	<logger name="org.springframework.integration.samples.zip">
+		<level value="info" />
+	</logger>
+
+	<!-- Root Logger -->
+	<root>
+		<priority value="warn" />
+		<appender-ref ref="console" />
+	</root>
+
+</log4j:configuration>