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support caching images in xslf 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1241896 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2012-02-08 13:44:12 +00:00
parent 9ed06b7351
commit e5bdcdd835
3 changed files with 59 additions and 23 deletions
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42
src/ooxml/java/org/apache/poi/xslf/usermodel/XMLSlideShow.java
View File

@ -19,17 +19,10 @@ package org.apache.poi.xslf.usermodel;
import org.apache.poi.POIXMLDocument;
import org.apache.poi.POIXMLDocumentPart;
import org.apache.poi.POIXMLException;
import org.apache.poi.POIXMLRelation;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackagePartName;
import org.apache.poi.openxml4j.opc.TargetMode;
import org.apache.poi.util.Beta;
import org.apache.poi.util.Internal;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.util.PackageHelper;
import org.apache.poi.util.Units;
import org.apache.poi.openxml4j.opc.*;
import org.apache.poi.util.*;
import org.apache.poi.xslf.XSLFSlideShow;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlObject;
@ -338,11 +331,13 @@ public class XMLSlideShow extends POIXMLDocument {
* @see XSLFPictureData#PICTURE_TYPE_DIB
*/
public int addPicture(byte[] pictureData, int format) {
getAllPictures();
XSLFPictureData img = findPictureData(pictureData);
POIXMLRelation relDesc = XSLFPictureData.RELATIONS[format];
int imageNumber = _pictures.size() + 1;
XSLFPictureData img = (XSLFPictureData) createRelationship(
XSLFPictureData.RELATIONS[format], XSLFFactory.getInstance(), imageNumber, true);
if(img == null) {
int imageNumber = _pictures.size();
img = (XSLFPictureData) createRelationship(
XSLFPictureData.RELATIONS[format], XSLFFactory.getInstance(), imageNumber + 1, true);
_pictures.add(img);
try {
OutputStream out = img.getPackagePart().getOutputStream();
@ -351,8 +346,25 @@ public class XMLSlideShow extends POIXMLDocument {
} catch (IOException e) {
throw new POIXMLException(e);
}
return imageNumber - 1;
return _pictures.size() - 1;
} else {
return _pictures.indexOf(img);
}
}
/**
* check if a picture with this picture data already exists in this presentation
*/
XSLFPictureData findPictureData(byte[] pictureData){
long checksum = IOUtils.calculateChecksum(pictureData);
for(XSLFPictureData pic : getAllPictures()){
if(pic.getChecksum() == checksum) {
return pic;
}
}
return null;
}
public XSLFTableStyles getTableStyles(){
return _tableStyles;
}

7
src/ooxml/java/org/apache/poi/xslf/usermodel/XSLFPictureData.java
View File

@ -168,4 +168,11 @@ public final class XSLFPictureData extends POIXMLDocumentPart {
return 0;
}
long getChecksum(){
if(checksum == null){
byte[] pictureData = getData();
checksum = IOUtils.calculateChecksum(pictureData);
}
return checksum;
}
}

17
src/ooxml/testcases/org/apache/poi/xslf/usermodel/TestXSLFPictureShape.java
View File

@ -113,4 +113,21 @@ public class TestXSLFPictureShape extends TestCase {
assertTrue(Arrays.equals(data1, data.getData()));
}
}
public void testImageCaching() {
XMLSlideShow ppt = new XMLSlideShow();
byte[] img1 = new byte[]{1,2,3};
byte[] img2 = new byte[]{3,4,5};
int idx1 = ppt.addPicture(img1, XSLFPictureData.PICTURE_TYPE_PNG);
assertEquals(0, idx1);
assertEquals(0, ppt.addPicture(img1, XSLFPictureData.PICTURE_TYPE_PNG));
int idx2 = ppt.addPicture(img2, XSLFPictureData.PICTURE_TYPE_PNG);
assertEquals(1, idx2);
assertEquals(1, ppt.addPicture(img2, XSLFPictureData.PICTURE_TYPE_PNG));
XSLFSlide slide1 = ppt.createSlide();
XSLFSlide slide2 = ppt.createSlide();
}
}