de.intarsys.pdf.st.STTrailerXRefSection Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
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 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package de.intarsys.pdf.st;

import java.io.IOException;

import de.intarsys.pdf.cos.COSDictionary;
import de.intarsys.pdf.cos.COSObject;
import de.intarsys.pdf.cos.COSTrailer;
import de.intarsys.pdf.crypt.ISystemSecurityHandler;
import de.intarsys.pdf.parser.COSLoadException;
import de.intarsys.pdf.writer.COSWriter;

/**
 * A section in a classical XRef.
 */
public class STTrailerXRefSection extends STXRefSection {
	private COSDictionary trailerDict;

	private STStreamXRefSection xRefStream;

	public STTrailerXRefSection(STDocument doc) {
		super(doc);
		this.trailerDict = COSDictionary.create();
	}

	public STTrailerXRefSection(STDocument doc, long offset) {
		super(doc, offset);
	}

	@Override
	public COSDictionary cosGetDict() {
		return trailerDict;
	}

	@Override
	public COSObject cosGetObject() {
		return trailerDict;
	}

	public void cosSetDict(COSDictionary pTrailerDict) {
		this.trailerDict = pTrailerDict;
	}

	@Override
	public STXRefSection createSuccessor() {
		STTrailerXRefSection newXRefSection = new STTrailerXRefSection(getDoc());
		// we must copy everything from trailer dict as it may have changes
		COSDictionary newTrailer = (COSDictionary) cosGetDict().copyShallow();
		newTrailer.remove(COSTrailer.DK_Prev);
		newTrailer.remove(STXRefSection.DK_XRefStm);
		newXRefSection.cosSetDict(newTrailer);
		newXRefSection.setPrevious(this);
		return newXRefSection;
	}

	@Override
	public AbstractXRefWriter getWriter(COSWriter cosWriter) {
		return new XRefTrailerWriter(cosWriter);
	}

	public STStreamXRefSection getXRefStream() {
		return xRefStream;
	}

	@Override
	protected boolean isStreamed() {
		return false;
	}

	@Override
	public COSObject load(int objectNumber,
			ISystemSecurityHandler securityHandler) throws IOException,
			COSLoadException {
		if (getXRefStream() != null) {
			COSObject loaded = getXRefStream().load(objectNumber,
					securityHandler);
			if (loaded != null) {
				return loaded;
			}
		}
		return super.load(objectNumber, securityHandler);
	}

	public void setXRefStream(STStreamXRefSection xRefStream) {
		this.xRefStream = xRefStream;
		setXRefStmOffset(xRefStream.getOffset());
	}
}