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package org.codehaus.jackson.util;

import java.util.Map;
import java.util.LinkedHashMap;

/**
 * Singleton class that adds a simple first-level cache in front of
 * regular String.intern() functionality. This is done as a minor
 * performance optimization, to avoid calling native intern() method
 * in cases where same String is being interned multiple times.
 *

* Note: that this class extends {@link LinkedHashMap} is an implementation * detail -- no code should ever directly call Map methods. */ @SuppressWarnings("serial") public final class InternCache extends LinkedHashMap { /** * Size to use is somewhat arbitrary, so let's choose something that's * neither too small (low hit ratio) nor too large (waste of memory) */ private final static int MAX_ENTRIES = 192; public final static InternCache instance = new InternCache(); private InternCache() { super(MAX_ENTRIES, 0.8f, true); } protected boolean removeEldestEntry(Map.Entry eldest) { return size() > MAX_ENTRIES; } public synchronized String intern(String input) { String result = get(input); if (result == null) { result = input.intern(); put(result, result); } return result; } }





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