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/* SimpleEvaluatorX.java
Purpose:
Description:
History:
Jul 29, 2011 9:30:30 AM, Created by henrichen
Copyright (C) 2011 Potix Corporation. All Rights Reserved.
*/
package org.zkoss.bind.impl;
import org.zkoss.bind.BindContext;
import org.zkoss.bind.sys.BindEvaluatorX;
import org.zkoss.bind.sys.Binding;
import org.zkoss.xel.ExpressionFactory;
import org.zkoss.xel.ExpressionX;
import org.zkoss.xel.FunctionMapper;
import org.zkoss.xel.ValueReference;
import org.zkoss.xel.VariableResolver;
import org.zkoss.xel.XelContext;
import org.zkoss.xel.XelException;
import org.zkoss.zel.ImportHandler;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Components;
import org.zkoss.zk.ui.Page;
import org.zkoss.zk.xel.impl.SimpleEvaluator;
/**
* A simple implementation of {@link BindEvaluatorX}.
*
* @author henrichen
* @since 6.0.0
*/
public class BindEvaluatorXImpl extends SimpleEvaluator implements BindEvaluatorX {
private static final long serialVersionUID = 1L;
public BindEvaluatorXImpl(FunctionMapper mapper, Class expfcls) {
super(mapper, expfcls);
}
public Object getValue(BindContext ctx, Component comp, ExpressionX expression) throws XelException {
try {
if (expression instanceof PropertyExpression) {
return expression.evaluate(null);
}
return expression.evaluate(newXelContext(ctx, comp));
} catch (Exception x) {
throw MiscUtil.mergeExceptionInfo(x, comp);
}
}
public void setValue(BindContext ctx, Component comp, ExpressionX expression, Object value) throws XelException {
//ZK-1063 No exception if binding to a non-existed property
//Dennis, Removed the try-catch PropertyNotFoundException, we don't have history to check why we did try-catch before
//However, it should throw the property-not-found to let user be aware it.
try {
if (expression instanceof PropertyExpression) {
expression.setValue(null, value);
} else {
expression.setValue(newXelContext(ctx, comp), value);
}
} catch (Exception x) {
throw MiscUtil.mergeExceptionInfo(x, comp);
}
}
public ExpressionX parseExpressionX(BindContext ctx, String expression, Class expectedType) throws XelException {
Component comp = null;
if (ctx != null) {
comp = ctx.getComponent();
if (comp == null) {
final Binding binding = ctx.getBinding();
if (binding != null) {
comp = binding.getComponent();
}
}
}
try {
return (ExpressionX) getExpressionFactory().parseExpression(newXelContext(ctx, comp),
"${" + expression + "}", expectedType);
} catch (Exception x) {
throw MiscUtil.mergeExceptionInfo(x, comp);
}
}
public Class getType(BindContext ctx, Component comp, ExpressionX expression) throws XelException {
return expression.getType(newXelContext(ctx, comp));
}
public ValueReference getValueReference(BindContext ctx, Component comp, ExpressionX expression)
throws XelException {
try {
ValueReference ref = expression.getValueReference(newXelContext(ctx, comp));
//bug 1129-ref NPE, no value reference if it is a SimpleNode
if (ref == null) {
XelContext xctx = newXelContext(ctx, comp);
//Dennis, a special control flag to ignore ref-binding getValue in BindELResolver
if (ctx.getAttribute(BinderImpl.IGNORE_REF_VALUE) == null) //ZK-3185
xctx.setAttribute(BinderImpl.IGNORE_REF_VALUE, Boolean.TRUE);
Object val = expression.evaluate(xctx);
if (val instanceof ReferenceBindingImpl) { //get value-reference from ref-binding
ref = ((ReferenceBindingImpl) val).getValueReference();
}
}
return ref;
} catch (Exception x) {
throw MiscUtil.mergeExceptionInfo(x, comp);
}
}
//utility to create an XelContext associated to the reference
protected XelContext newXelContext(BindContext ctx, final Component comp) {
final FunctionMapper mapper = getFunctionMapper(comp);
//ZK-1795MVVM nested template may cause exception
//Dennis: Shouldn't get the real variable-resolver and keep it, it will set ref as evaluator's self,
//When nested MVVM templates, if there are a ref-binding, it will newXelContext multiple time to do new evaluation in this evaluation,
//this cause the real variable-resolver's self be changed when newXelContext called.
final VariableResolver resolver = new VariableResolver() {
public Object resolveVariable(String name) throws XelException {
VariableResolver vr = getVariableResolver(comp);
return vr == null ? null : vr.resolveVariable(name);
}
};
final XelContext xelc = new SimpleBindXelContext(comp, ctx != null ? ctx.getBinder() : null, resolver, mapper); //super.newXelContext(comp);
xelc.setAttribute(BinderImpl.BINDCTX, ctx);
if (ctx != null) {
xelc.setAttribute(BinderImpl.BINDING, ctx.getBinding());
//Dennis, a special control flag to ignore adding tracker when doing el,
//see BindELContext#ignoreTracker
xelc.setAttribute(BinderImpl.IGNORE_TRACKER, ctx.getAttribute(BinderImpl.IGNORE_TRACKER));
}
if (comp != null) {
final Page page = Components.getCurrentPage(comp);
if (page != null) {
xelc.setAttribute(ImportHandler.PageClassResolver.class.getName(),
(ImportHandler.PageClassResolver) page::resolveClass);
}
}
return xelc;
}
public boolean isReadOnly(BindContext ctx, Component comp, ExpressionX expression) throws XelException {
return expression.isReadOnly(newXelContext(ctx, comp));
}
}
