/*
* Copyright (c) 2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* 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.wso2.carbon.bpel.ui.bpel2svg.impl;
import org.wso2.carbon.bpel.ui.bpel2svg.ProcessInterface;
import java.io.*;
import org.w3c.dom.svg.SVGDocument;
import org.apache.batik.dom.util.DOMUtilities;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.image.JPEGTranscoder;
import org.apache.batik.util.SVGConstants;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Handles the SVG generation
*/
public class SVGImpl implements org.wso2.carbon.bpel.ui.bpel2svg.SVGInterface {
private org.wso2.carbon.bpel.ui.bpel2svg.ProcessInterface rootActivity = null;
private Log log = LogFactory.getLog(SVGImpl.class);
private String svgStr = null;
private SVGDocument svgDoc = null;
public ProcessInterface getRootActivity() {
return rootActivity;
}
public void setRootActivity(org.wso2.carbon.bpel.ui.bpel2svg.ProcessInterface rootActivity) {
this.rootActivity = rootActivity;
}
/*
* Return the image as a SVG string
* */
public String generateSVGString() {
try {
StringWriter writer = new StringWriter();
SVGDocument svgDoc = getRootActivity().getSVGDocument();
this.svgDoc = svgDoc;
DOMUtilities.writeDocument(svgDoc, writer);
writer.close();
svgStr = writer.toString();
return svgStr;
} catch (IOException ioe) {
log.error("Error Generating SVG String", ioe);
return null;
}
}
/*
* Return the image as a base64 encoded string of a PNG
* */
public String toPNGBase64String() {
// Create a JPEG transcoder
JPEGTranscoder jpegTranscoder = new JPEGTranscoder();
// Set the transcoding hints.
jpegTranscoder.addTranscodingHint(JPEGTranscoder.KEY_QUALITY, new Float(0.8));
// Create the transcoder input.
String inputString = getHeaders() + generateSVGString(); //svgDoc is set from generateSVGString()
// TranscoderInput transcoderInput = new TranscoderInput(svgDoc);
Reader stringReader = new StringReader(inputString);
TranscoderInput transcoderInput2 = new TranscoderInput(stringReader);
// Create the transcoder output.
OutputStream osByteArray = new ByteArrayOutputStream();
TranscoderOutput transcoderOutput = new TranscoderOutput(osByteArray);
try {
jpegTranscoder.transcode(transcoderInput2, transcoderOutput);
} catch (TranscoderException e) {
log.error("JPEGTranscoder error", e);
return null;
}
try {
osByteArray.flush();
} catch (IOException e) {
log.error("Error while flushing OutputStreamByteArray", e);
return null;
}
String base64 = new String(Base64.encodeBase64(((ByteArrayOutputStream) osByteArray).toByteArray()));
return base64;
}
/*
* Return the image as a byte array of a PNG
* */
public byte[] toPNGBytes() {
// Create a JPEG transcoder
JPEGTranscoder jpegTranscoder = new JPEGTranscoder();
// Set the transcoding hints.
jpegTranscoder.addTranscodingHint(JPEGTranscoder.KEY_QUALITY, new Float(0.8));
// Create the transcoder input.
String inputString = getHeaders() + generateSVGString(); //svgDoc is set from generateSVGString()
// TranscoderInput transcoderInput = new TranscoderInput(svgDoc);
Reader stringReader = new StringReader(inputString);
TranscoderInput transcoderInput2 = new TranscoderInput(stringReader);
// Create the transcoder output.
OutputStream osByteArray = new ByteArrayOutputStream();
TranscoderOutput transcoderOutput = new TranscoderOutput(osByteArray);
try {
jpegTranscoder.transcode(transcoderInput2, transcoderOutput);
} catch (TranscoderException e) {
log.error("JPEGTranscoder transcode error", e);
return null;
}
try {
osByteArray.flush();
} catch (IOException e) {
log.error("Error while flushing OutputStreamByteArray", e);
return null;
}
return ((ByteArrayOutputStream) osByteArray).toByteArray();
}
public String getHeaders() {
return "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" + "<!DOCTYPE svg PUBLIC '" +
SVGConstants.SVG_PUBLIC_ID + "' '" + SVGConstants.SVG_SYSTEM_ID + "'>\n\n";
}
}