private void mergePage(COSArray array, PDPage page) {
int layoutPageNum = pageCount % layoutPages.size();
LayoutPage layoutPage = (LayoutPage) layoutPages.get(layoutPageNum);
PDResources resources = page.findResources();
if (resources == null) {
resources = new PDResources();
page.setResources(resources);
}
COSDictionary docResDict = resources.getCOSDictionary();
COSDictionary layoutResDict = layoutPage.res;
mergeArray(COSName.PROC_SET, docResDict, layoutResDict);
mergeDictionary(COSName.FONT, docResDict, layoutResDict, layoutPage.objectNameMap);
mergeDictionary(COSName.XOBJECT, docResDict, layoutResDict, layoutPage.objectNameMap);
mergeDictionary(COSName.EXT_G_STATE, docResDict, layoutResDict, layoutPage.objectNameMap);
// we are going to wrap the existing content around some save/restore
// graphics state, so the result is
//
// <save graphics state>
// <all existing content streams>
// <restore graphics state>
// <overlay content>
array.add(0, saveGraphicsStateStream);
array.add(restoreGraphicsStateStream);
array.add(layoutPage.contents);
}
/**
* merges two arrays.
*
* @param dest
* @param source
*/
private void mergeArray(COSName name, COSDictionary dest, COSDictionary source) {
COSArray destDict = (COSArray) dest.getDictionaryObject(name);
COSArray sourceDict = (COSArray) source.getDictionaryObject(name);
if (destDict == null) {
destDict = new COSArray();
dest.setItem(name, destDict);
}
for (int sourceDictIdx = 0;
sourceDict != null && sourceDictIdx < sourceDict.size();
sourceDictIdx++) {
COSBase key = sourceDict.get(sourceDictIdx);
if (key instanceof COSName) {
COSName keyname = (COSName) key;
boolean bFound = false;
for (int destDictIdx = 0; destDictIdx < destDict.size(); destDictIdx++) {
COSBase destkey = destDict.get(destDictIdx);
if (destkey instanceof COSName) {
COSName destkeyname = (COSName) destkey;
if (destkeyname.equals(keyname)) {
bFound = true;
break;
}
}
}
if (!bFound) {
destDict.add(keyname);
}
}
}
}
private void processPages(List pages) throws IOException {
Iterator pageIter = pages.iterator();
while (pageIter.hasNext()) {
PDPage page = (PDPage) pageIter.next();
COSDictionary pageDictionary = page.getCOSDictionary();
COSBase contents = pageDictionary.getDictionaryObject(COSName.CONTENTS);
if (contents instanceof COSStream) {
COSStream contentsStream = (COSStream) contents;
// System.err.println("stream");
COSArray array = new COSArray();
array.add(contentsStream);
mergePage(array, page);
pageDictionary.setItem(COSName.CONTENTS, array);
} else if (contents instanceof COSArray) {
COSArray contentsArray = (COSArray) contents;
mergePage(contentsArray, page);
} else {
throw new IOException("Contents are unknown type:" + contents.getClass().getName());
}
pageCount++;
}
}