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keyPool

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Douglas Crockford 2012-12-02 16:00:54 -08:00
parent 1b5a59f428
commit 50c3afb216
1 changed files with 23 additions and 1 deletions
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24
JSONObject.java
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@ -91,9 +91,21 @@ import java.util.Set;
* </ul>
*
* @author JSON.org
* @version 2012-10-27
* @version 2012-12-01
*/
public class JSONObject {
/**
* The maximum number of keys in the key pool.
*/
private static final int keyPoolSize = 100;
/**
* Key pooling is like string interning, but without permanently tying up
* memory. To help conserve memory, storage of duplicated key strings in
* JSONObjects will be avoided by using a key pool to manage unique key
* string objects. This is used by JSONObject.put(string, object).
*/
private static HashMap keyPool = new HashMap(keyPoolSize);
/**
* JSONObject.NULL is equivalent to the value that JavaScript calls null,
@ -1110,11 +1122,21 @@ public class JSONObject {
* or if the key is null.
*/
public JSONObject put(String key, Object value) throws JSONException {
String pooled;
if (key == null) {
throw new JSONException("Null key.");
}
if (value != null) {
testValidity(value);
pooled = (String)keyPool.get(key);
if (pooled == null) {
if (keyPool.size() >= keyPoolSize) {
keyPool = new HashMap(keyPoolSize);
}
keyPool.put(key, key);
} else {
key = pooled;
}
this.map.put(key, value);
} else {
this.remove(key);