メディアハンドラーとワークフローを使用したアセットの処理

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion> 
	<!-- ====================================================================== --> 
	<!-- P A R E N T P R O J E C T D E S C R I P T I O N --> 
	<!-- ====================================================================== -->
	<parent>
		<groupId>com.day.cq.dam</groupId>
		<artifactId>dam</artifactId>
		<version>5.2.14</version>
		<relativePath>../parent</relativePath>
	</parent> 
	<!-- ====================================================================== --> 
	<!-- P R O J E C T D E S C R I P T I O N --> 
	<!-- ====================================================================== -->
	<groupId>com.day.cq5.myhandler</groupId>
	<artifactId>myBundle</artifactId>
	<name>My CQ5 bundle</name>
	<version>0.0.1-SNAPSHOT</version>
	<description>This is my CQ5 bundle</description>
	<packaging>bundle</packaging> 
	<!-- ====================================================================== --> 
	<!-- B U I L D D E F I N I T I O N --> 
	<!-- ====================================================================== -->
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.felix</groupId>
				<artifactId>maven-scr-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.apache.sling</groupId>
				<artifactId>maven-sling-plugin</artifactId>
				<configuration>
					<slingUrlSuffix>/libs/dam/install/</slingUrlSuffix>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.apache.felix</groupId>
				<artifactId>maven-bundle-plugin</artifactId>
				<extensions>true</extensions>
				<configuration>
					<instructions>
						<Bundle-Category>cq5</Bundle-Category>
						<Export-Package> com.day.cq5.myhandler </Export-Package>
					</instructions>
				</configuration>
			</plugin>
		</plugins>
	</build> 
	<!-- ====================================================================== --> 
	<!-- D E P E N D E N C I E S --> 
	<!-- ====================================================================== -->
	<dependencies>
		<dependency>
			<groupId>com.day.cq.dam</groupId>
			<artifactId>cq-dam-api</artifactId>
			<version>5.2.10</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>com.day.cq.dam</groupId>
			<artifactId>cq-dam-core</artifactId>
			<version>5.2.10</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>com.day.cq</groupId>
			<artifactId>cq-commons</artifactId>
		</dependency>
		<dependency>
			<groupId>javax.jcr</groupId>
			<artifactId>jcr</artifactId>
		</dependency>
		<dependency>
			<groupId>org.apache.felix</groupId>
			<artifactId>org.osgi.compendium</artifactId>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
		</dependency>
		<dependency>
			<groupId>commons-lang</groupId>
			<artifactId>commons-lang</artifactId>
		</dependency>
		<dependency>
			<groupId>commons-collections</groupId>
			<artifactId>commons-collections</artifactId>
		</dependency>
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
		</dependency>
		<dependency>
			<groupId>com.day.commons</groupId>
			<artifactId>day-commons-gfx</artifactId>
		</dependency>
		<dependency>
			<groupId>com.day.commons</groupId>
			<artifactId>day-commons-text</artifactId>
		</dependency>
		<dependency>
			<groupId>com.day.cq.workflow</groupId>
			<artifactId>cq-workflow-api</artifactId>
		</dependency>
		<dependency>
			<groupId>com.day.cq.wcm</groupId>
			<artifactId>cq-wcm-foundation</artifactId>
			<version>5.2.22</version>
		</dependency>
	</dependencies>

package com.day.cq5.myhandler; 
import java.awt.Color; 
import java.awt.Rectangle; 
import java.awt.image.BufferedImage; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import javax.jcr.Node; 
import javax.jcr.RepositoryException; 
import javax.jcr.Session; 
import org.apache.commons.io.IOUtils; 
import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 
import com.day.cq.dam.api.metadata.ExtractedMetadata; 
import com.day.cq.dam.core.AbstractAssetHandler; 
import com.day.image.Font; 
import com.day.image.Layer; 
import com.day.cq.wcm.foundation.ImageHelper; 

/** 
 *  The <code>MyHandler</code> can extract text files 
 *  @scr.component inherit="true" immediate="true" metatype="false" 
 *  @scr.service 
 *  
 **/ 

public class MyHandler extends AbstractAssetHandler { 
	/** * Logger instance for this class. */ 
	private static final Logger log = LoggerFactory.getLogger(MyHandler.class); 
	/** * Music icon margin */ 
	private static final int MARGIN = 10; 
	/** * @see com.day.cq.dam.api.handler.AssetHandler#getMimeTypes() */ 
	public String[] getMimeTypes() {
		return new String[] {"text/plain"}; 
	}

	public ExtractedMetadata extractMetadata(Node asset) { 
		ExtractedMetadata extractedMetadata = new ExtractedMetadata(); 
		InputStream data = getInputStream(asset); 
		try { 
			// read text data 
			InputStreamReader reader = new InputStreamReader(data); 
			char[] buffer = new char[4096]; 
			String text = ""; 
			while (reader.read(buffer) != -1) { 
				text += new String(buffer); 
			} 
			reader.close(); 
			long wordCount = this.wordCount(text); 
			extractedMetadata.setProperty("text", text); 
			extractedMetadata.setMetaDataProperty("Word Count",wordCount); 
			setMimetype(extractedMetadata, asset); 
		} catch (Throwable t) { 
			log.error("handling error: " + t.toString(), t); 
		} finally { 
			IOUtils.closeQuietly(data); 
		} 
		return extractedMetadata; } 
	// ----------------------< helpers >---------------------------------------- 
	protected BufferedImage getThumbnailImage(Node node) { 
		ExtractedMetadata metadata = extractMetadata(node); 
		final String text = (String) metadata.getProperty("text"); 
		// create text layer 
		final Layer layer = new Layer(500, 600, Color.WHITE); 
		layer.setPaint(Color.black); 
		Font font = new Font("Arial", 12); 
		String displayText = this.getDisplayText(text, 600, 12); 
		if(displayText!=null && displayText.length() > 0) {
			// commons-gfx Font class would throw IllegalArgumentException on empty or null text 
			layer.drawText(10, 10, 500, 600, displayText, font, Font.ALIGN_LEFT, 0, 0); 
		} 
		// create watermark and merge with text layer 
		Layer watermarkLayer; 
		try { 
			final Session session = node.getSession(); 
			watermarkLayer = ImageHelper.createLayer(session, "/content/dam/geometrixx/icons/certificate.png"); 
			watermarkLayer.setX(MARGIN); 
			watermarkLayer.setY(MARGIN); 
			layer.merge(watermarkLayer); 
		} catch (RepositoryException e) { 
			// TODO Auto-generated catch block 
			e.printStackTrace(); 
		} catch (IOException e) { 
			// TODO Auto-generated catch block 
			e.printStackTrace(); } 
		layer.crop(new Rectangle(510, 600)); 
		return layer.getImage(); } 
	// ---------------< private >----------------------------------------------- 
	/** 
	 * This method cuts lines if the text file is too long..
	 *  * @param text
	 *  * text to check
	 *  * @param height
	 *  * text box height (px)
	 *  * @param fontheight
	 *  * font height (px) 
	 *  * @return the text which will fit into the box 
	 */ 
	private String getDisplayText(String text, int height, int fontheight) { 
		String trimmedText = text.trim(); 
		int numOfLines = height / fontheight; 
		String lines[] = trimmedText.split("\n"); 
		if (lines.length <= numOfLines) { 
			return trimmedText; 
		} else { 
			String cuttetText = ""; 
			for (int i = 0; i < numOfLines; i++) { 
				cuttetText += lines[i] + "\n"; 
			} 
			return cuttetText; 
		} 
	} 
	/**
	 *  * This method counts the number of words in a string 
	 *  * @param text the String whose words would like to be counted
	 *  * @return the number of words in the string
	 *  */ 
	private long wordCount(String text) { 
		// We need to keep track of the last character, if we have two whitespaces in a row we dont want to double count.
		// The starting of the document is always a whitespace.
		boolean prevWhiteSpace = true; 
		boolean currentWhiteSpace = true; 
		char c; long numwords = 0; 
		int j = text.length(); 
		int i = 0; 
		while (i < j) { 
			c = text.charAt(i++); 
			if (c == 0) { break; } 
			currentWhiteSpace = Character.isWhitespace(c); 
			if (currentWhiteSpace && !prevWhiteSpace) { numwords++; } 
			prevWhiteSpace = currentWhiteSpace; 
		} 
		// If we do not end with a whitespace then we need to add one extra word.
		if (!currentWhiteSpace) { numwords++; } 
		return numwords; 
	} 
}