使用媒体处理程序和工作流处理资源 processing-assets-using-media-handlers-and-workflows

<project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://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/we-retail/en/products/apparel/gloves/Gloves.jpg");
   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 do not 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;
 }
}