STXRefEntryCompressed.java :  » PDF » jPod » de » intarsys » pdf » st » Java Open Source

/*
 * 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
 *   and/or other materials provided with the distribution.
 *
 * - 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
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.st;

import java.io.IOException;

import de.intarsys.pdf.cos.COSIndirectObject;
import de.intarsys.pdf.cos.COSObject;
import de.intarsys.pdf.cos.COSObjectKey;
import de.intarsys.pdf.crypt.ISystemSecurityHandler;
import de.intarsys.pdf.parser.COSLoadException;

/**
 * An entry in a XRef stream.
 */
public class STXRefEntryCompressed extends STXRefEntry {
  private COSObjectKey streamObjectKey;

  private int index;

  public STXRefEntryCompressed(COSObjectKey key, COSObjectKey stmObjectKey,
      int indexOfObject) {
    super(key);
    this.streamObjectKey = stmObjectKey;
    this.index = indexOfObject;
  }

  /*
   * (non-Javadoc)
   * 
   * @see de.intarsys.pdf.storage.STXRefEntry#isFree()
   */
  public boolean isFree() {
    return false;
  }

  public COSObject load(STDocument doc, ISystemSecurityHandler securityHandler)
      throws IOException, COSLoadException {
    COSIndirectObject streamObjectRef = doc
        .getObjectReference(getStreamObjectKey());
    COSObject objStrmIO = streamObjectRef.dereference();
    if ((objStrmIO != null) && !objStrmIO.isNull()) {
      COSObjectStream strm = (COSObjectStream) COSObjectStream.META
          .createFromCos(objStrmIO);
      return strm.loadObject(index, doc.getParser());
    }
    return null;
  }

  /*
   * (non-Javadoc)
   * 
   * @see de.intarsys.pdf.storage.STXRefEntry#getColumn1()
   */
  public long getColumn1() {
    return 0;
  }

  /*
   * (non-Javadoc)
   * 
   * @see de.intarsys.pdf.storage.STXRefEntry#getColumn2()
   */
  public int getColumn2() {
    return 0;
  }

  /*
   * (non-Javadoc)
   * 
   * @see de.intarsys.pdf.storage.STXRefEntry#fill(int)
   */
  public STXRefEntryOccupied fill(int pos) {
    return null;
  }

  /*
   * (non-Javadoc)
   * 
   * @see de.intarsys.pdf.storage.STXRefEntry#unlink()
   */
  protected void unlink() {
    //
  }

  /*
   * (non-Javadoc)
   * 
   * @see de.intarsys.pdf.storage.STXRefEntry#accept(de.intarsys.pdf.storage.IXRefEntryVisitor)
   */
  public void accept(IXRefEntryVisitor visitor)
      throws XRefEntryVisitorException {
    visitor.visitFromCompressed(this);
  }

  public int getIndex() {
    return index;
  }

  public COSObjectKey getStreamObjectKey() {
    return streamObjectKey;
  }

  public int getStreamObjectNumber() {
    return getStreamObjectKey().getObjectNumber();
  }

  public STXRefEntry copy() {
    return new STXRefEntryCompressed(getKey(), getStreamObjectKey(),
        getIndex());
  }
}