org.zkoss.zk.ui.metainfo.PageEvalRef Maven / Gradle / Ivy
/* PageEvalRef.java
Purpose:
Description:
History:
Wed Sep 5 10:59:39 2007, Created by tomyeh
Copyright (C) 2007 Potix Corporation. All Rights Reserved.
{{IS_RIGHT
This program is distributed under LGPL Version 2.1 in the hope that
it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.zk.ui.metainfo;
import static org.zkoss.lang.Generics.cast;
import org.zkoss.xel.FunctionMapper;
import org.zkoss.xel.ExpressionFactory;
import org.zkoss.zk.xel.Evaluator;
import org.zkoss.zk.xel.impl.SimpleEvaluator;
/**
* The evaluator reference based on page definition.
* Used by {@link PageDefinition} only.
*
* @author tomyeh
* @since 3.0.0
*/
/*package*/ class PageEvalRef extends AbstractEvalRef
implements java.io.Serializable {
private transient PageDefinition _pagedef;
/** Used only if _pagedef == null. */
private transient Evaluator _eval;
/** The implementation of the expression factory.
* Used only if _pagedef == null.
*/
private Class _expfcls;
/** The function mapper for the evaluator.
* Used only if _pagedef == null.
*/
private FunctionMapper _mapper;
/*package*/ PageEvalRef(PageDefinition pagedef) {
_pagedef = pagedef;
}
//EvaluatorRef//
public Evaluator getEvaluator() {
if (_pagedef != null)
return _pagedef.getEvaluator();
if (_eval == null)
_eval = new SimpleEvaluator(_mapper, _expfcls);
return _eval;
}
public PageDefinition getPageDefinition() {
return _pagedef;
}
//Serializable//
private synchronized void writeObject(java.io.ObjectOutputStream s)
throws java.io.IOException {
s.defaultWriteObject();
s.writeObject(_pagedef != null ? _pagedef.getExpressionFactoryClass(): _expfcls);
s.writeObject(_pagedef != null ? _pagedef.getTaglibMapper(): _mapper);
}
private void readObject(java.io.ObjectInputStream s)
throws java.io.IOException, ClassNotFoundException {
s.defaultReadObject();
_expfcls = cast((Class)s.readObject());
_mapper = (FunctionMapper)s.readObject();
}
}