// StringBuilderPool.java
/**
* Copyright (C) 2008 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mongodb.util;
public class StringBuilderPool extends SimplePool<StringBuilder> {
/** Initializes a pool of a given number of StringBuilders, each of a certain size.
* @param maxToKeep the number of string builders in the pool
* @param maxSize the size of each string builder
*/
public StringBuilderPool( String name , int maxToKeep , int maxSize ){
super( "StringBuilderPool-" + name , maxToKeep , -1 );
_maxSize = maxSize;
}
/** Create a new string builder.
* @return the string builder
*/
public StringBuilder createNew(){
return new StringBuilder();
}
/** Checks that the given string builder is within the size limit.
* @param buf the builder to check
* @return if it is not too big
*/
public boolean ok( StringBuilder buf ){
if ( buf.length() > _maxSize )
return false;
buf.setLength( 0 );
return true;
}
protected long memSize( StringBuilder buf ){
return buf.length() * 2;
}
final int _maxSize;
}