org.sejda.sambox.cos.COSObjectKey Maven / Gradle / Ivy
/*
* 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.sejda.sambox.cos;
import java.util.Objects;
import static java.util.Comparator.comparing;
/**
* Object representing a key to identify a PDF object
*
* @author Michael Traut
*/
public final class COSObjectKey implements Comparable
{
private final long number;
private final int generation;
/**
* @param number The object number.
* @param generation The object generation number.
*/
public COSObjectKey(long number, int generation)
{
this.number = number;
this.generation = generation;
}
/**
* @return The objects generation number.
*/
public int generation()
{
return generation;
}
/**
* @return The object number
*/
public long objectNumber()
{
return number;
}
@Override
public boolean equals(Object obj)
{
if (this == obj)
{
return true;
}
if (!(obj instanceof COSObjectKey other))
{
return false;
}
return (number == other.number && generation == other.generation);
}
@Override
public int hashCode()
{
// most likely generation is 0. Shift number 4 times (fast as multiply)
// to support generation numbers up to 15
return Long.valueOf((number << 4) + generation).hashCode();
}
@Override
public String toString()
{
return String.format("on=%d, gn=%d", number, generation);
}
@Override
public int compareTo(COSObjectKey other)
{
return Objects.compare(this, other,
comparing(COSObjectKey::objectNumber).thenComparingInt(COSObjectKey::generation));
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy