74 lines
2.3 KiB
Java
74 lines
2.3 KiB
Java
/*
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* Copyright 2010, 2011, 2012 mapsforge.org
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*
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* This program is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.mapsforge.database.mapfile;
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import org.mapsforge.database.mapfile.header.SubFileParameter;
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/**
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* An immutable container class which is the key for the index cache.
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*/
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class IndexCacheEntryKey {
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private final int hashCodeValue;
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private final long indexBlockNumber;
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private final SubFileParameter subFileParameter;
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/**
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* Creates an immutable key to be stored in a map.
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*
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* @param subFileParameter
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* the parameters of the map file.
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* @param indexBlockNumber
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* the number of the index block.
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*/
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IndexCacheEntryKey(SubFileParameter subFileParameter, long indexBlockNumber) {
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this.subFileParameter = subFileParameter;
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this.indexBlockNumber = indexBlockNumber;
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this.hashCodeValue = calculateHashCode();
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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} else if (!(obj instanceof IndexCacheEntryKey)) {
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return false;
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}
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IndexCacheEntryKey other = (IndexCacheEntryKey) obj;
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if (this.subFileParameter == null && other.subFileParameter != null) {
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return false;
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} else if (this.subFileParameter != null && !this.subFileParameter.equals(other.subFileParameter)) {
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return false;
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} else if (this.indexBlockNumber != other.indexBlockNumber) {
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return false;
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}
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return true;
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}
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@Override
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public int hashCode() {
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return this.hashCodeValue;
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}
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/**
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* @return the hash code of this object.
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*/
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private int calculateHashCode() {
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int result = 7;
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result = 31 * result + ((this.subFileParameter == null) ? 0 : this.subFileParameter.hashCode());
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result = 31 * result + (int) (this.indexBlockNumber ^ (this.indexBlockNumber >>> 32));
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return result;
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}
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}
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