/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.util;
import com.espertech.esper.collection.Pair;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* Cast implementation for non-numeric values that caches allowed casts assuming there is a small set of casts allowed.
*/
public class SimpleTypeCasterAnyType implements SimpleTypeCaster {
private Class typeToCastTo;
private CopyOnWriteArraySet<Pair<Class, Boolean>> pairs = new CopyOnWriteArraySet<Pair<Class, Boolean>>();
/**
* Ctor.
*
* @param typeToCastTo is the target type
*/
public SimpleTypeCasterAnyType(Class typeToCastTo) {
this.typeToCastTo = typeToCastTo;
}
public boolean isNumericCast() {
return false;
}
public Object cast(Object object) {
if (object.getClass() == typeToCastTo) {
return object;
}
// check cache to see if this is cast-able
for (Pair<Class, Boolean> pair : pairs) {
if (pair.getFirst() == typeToCastTo) {
if (!pair.getSecond()) {
return null;
}
return object;
}
}
// Not found in cache, add to cache;
synchronized (this) {
// search cache once more
for (Pair<Class, Boolean> pair : pairs) {
if (pair.getFirst() == typeToCastTo) {
if (!pair.getSecond()) {
return null;
}
return object;
}
}
// Determine if any of the super-types and interfaces that the object implements or extends
// is the same as any of the target types
Set<Class> classesToCheck = new HashSet<Class>();
JavaClassHelper.getSuper(object.getClass(), classesToCheck);
if (classesToCheck.contains(typeToCastTo)) {
pairs.add(new Pair<Class, Boolean>(object.getClass(), true));
return object;
}
pairs.add(new Pair<Class, Boolean>(object.getClass(), false));
return null;
}
}
}