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DDogleg Numerics is a high performance Java library for non-linear optimization, robust model fitting, polynomial root finding, sorting, and more.
/*
* Copyright (c) 2012-2015, Peter Abeles. All Rights Reserved.
*
* This file is part of DDogleg (http://ddogleg.org).
*
* 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 org.ddogleg.struct;
import java.util.Stack;
/**
* Simple class which helps minimize declaring new objects by helping you recycle them.
*
* @author Peter Abeles
*/
public class RecycleManager {
protected Class targetClass;
protected Stack unused = new Stack();
public RecycleManager(Class targetClass) {
this.targetClass = targetClass;
}
protected RecycleManager() {
}
/**
* Either returns a recycled instance or a new one.
*/
public T requestInstance() {
T a;
if( unused.size() > 0 ) {
a = unused.pop();
} else {
a = createInstance();
}
return a;
}
/**
* Call when an instance is no longer needed and can be recycled
*/
public void recycleInstance( T object ) {
unused.add(object);
}
/**
* Creates a new instance using the class. overload this to handle more complex constructors
*/
protected T createInstance() {
try {
return targetClass.newInstance();
} catch (InstantiationException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
/**
* Returns the stack containing all the unused instances.
*/
public Stack getUnused() {
return unused;
}
}