001: /*
002: * Copyright (c) 2007, intarsys consulting GmbH
003: *
004: * Redistribution and use in source and binary forms, with or without
005: * modification, are permitted provided that the following conditions are met:
006: *
007: * - Redistributions of source code must retain the above copyright notice,
008: * this list of conditions and the following disclaimer.
009: *
010: * - Redistributions in binary form must reproduce the above copyright notice,
011: * this list of conditions and the following disclaimer in the documentation
012: * and/or other materials provided with the distribution.
013: *
014: * - Neither the name of intarsys nor the names of its contributors may be used
015: * to endorse or promote products derived from this software without specific
016: * prior written permission.
017: *
018: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
022: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
024: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
025: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
026: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
027: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
028: * POSSIBILITY OF SUCH DAMAGE.
029: */
030: package de.intarsys.pdf.cos;
031:
032: /**
033: * An object that is used as a lookup key for COS objects.
034: */
035: public class COSObjectKey {
036: private final int objectNumber;
037:
038: private final int generationNumber;
039:
040: private int hash = 0;
041:
042: public COSObjectKey(int objectNumber, int generationNumber) {
043: super ();
044: this .objectNumber = objectNumber;
045: this .generationNumber = generationNumber;
046: this .hash = 17 + (objectNumber * 59);
047: }
048:
049: /**
050: * The next key after this.
051: *
052: * @return The next key after this.
053: */
054: public COSObjectKey createNextKey() {
055: return new COSObjectKey(getObjectNumber() + 1, 0);
056: }
057:
058: /*
059: * (non-Javadoc)
060: *
061: * @see java.lang.Object#equals(java.lang.Object)
062: */
063: public boolean equals(Object obj) {
064: if (!(obj instanceof COSObjectKey)) {
065: return false;
066: }
067: COSObjectKey other = (COSObjectKey) obj;
068: return objectNumber == other.objectNumber;
069: }
070:
071: /**
072: * The keys generation number.
073: *
074: * @return The keys generation number.
075: */
076: public int getGenerationNumber() {
077: return generationNumber;
078: }
079:
080: /**
081: * The keys object number.
082: *
083: * @return The keys object number.
084: */
085: public int getObjectNumber() {
086: return objectNumber;
087: }
088:
089: /*
090: * (non-Javadoc)
091: *
092: * @see java.lang.Object#hashCode()
093: */
094: public int hashCode() {
095: return hash;
096: }
097:
098: /*
099: * (non-Javadoc)
100: *
101: * @see java.lang.Object#toString()
102: */
103: public String toString() {
104: return getObjectNumber() + " " + getGenerationNumber() + " R"; //$NON-NLS-1$ //$NON-NLS-2$
105: }
106: }
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