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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.pdfbox.cos;
/**
* Object representing the physical reference to an indirect pdf object.
*
* @author Michael Traut
*
*/
public class COSObjectKey implements Comparable
{
private final long number;
private final int generation;
/**
* PDFObjectKey constructor comment.
*
* @param object The object that this key will represent.
*/
public COSObjectKey(COSObject object)
{
this(object.getObjectNumber(), object.getGenerationNumber());
}
/**
* PDFObjectKey constructor comment.
*
* @param num The object number.
* @param gen The object generation number.
*/
public COSObjectKey(long num, int gen)
{
number = num;
generation = gen;
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj)
{
COSObjectKey objToBeCompared = obj instanceof COSObjectKey ? (COSObjectKey)obj : null;
return objToBeCompared != null &&
objToBeCompared.getNumber() == getNumber() &&
objToBeCompared.getGeneration() == getGeneration();
}
/**
* This will get the generation number.
*
* @return The objects generation number.
*/
public int getGeneration()
{
return generation;
}
/**
* This will get the objects id.
*
* @return The object's id.
*/
public long getNumber()
{
return number;
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode()
{
return Long.valueOf(number+generation).hashCode();
}
@Override
public String toString()
{
return Long.toString(number) + " " + Integer.toString(generation) + " R";
}
@Override
public int compareTo(COSObjectKey other)
{
if (getNumber() < other.getNumber())
{
return -1;
}
else if (getNumber() > other.getNumber())
{
return 1;
}
else
{
if (getGeneration() < other.getGeneration())
{
return -1;
}
else if (getGeneration() > other.getGeneration())
{
return 1;
}
else
{
return 0;
}
}
}
}