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58 lines
2.2 KiB
58 lines
2.2 KiB
14 years ago
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/**
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* LargeNumberCache.java
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* Copyright 2010 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
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* First released 09.10.2010 at http://yacy.net
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.document;
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/**
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* a LargeIntegerCache is used whenever a Integer.valueOf(int i) is used.
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* The Integer java class provides a cache for values from -128 to +127
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* which is not enough for the parser to organize word positions in texts
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* Using this large cache the parser has a lower memory allocation and is faster.
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*/
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public class LargeNumberCache {
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private static final int integerCacheLimit = 3000;
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private static final Integer integerCache[];
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// fill the cache
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static {
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integerCache = new Integer[integerCacheLimit];
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for (int i = 0; i < integerCache.length; i++) integerCache[i] = new Integer(i);
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}
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/**
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* Returns a Integer instance representing the specified int value.
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* If a new Integer instance is not required, this method
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* should generally be used in preference to the constructor
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* {@link #Integer(int)}, as this method is likely to yield
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* significantly better space and time performance by caching
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* frequently requested values.
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*
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* @param i an int value.
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* @return a Integer instance representing i.
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*/
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public final static Integer valueOf(final int i) {
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if (i < 0) return Integer.valueOf(i);
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if (i >= integerCacheLimit) return new Integer(i);
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return integerCache[i];
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}
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}
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