org.zkoss.zel.impl.parser.AstIdentifier Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* Generated By:JJTree: Do not edit this line. AstIdentifier.java */
package org.zkoss.zel.impl.parser;
import org.zkoss.zel.ELClass;
import org.zkoss.zel.ELException;
import org.zkoss.zel.MethodExpression;
import org.zkoss.zel.MethodInfo;
import org.zkoss.zel.MethodNotFoundException;
import org.zkoss.zel.PropertyNotFoundException;
import org.zkoss.zel.ValueExpression;
import org.zkoss.zel.ValueReference;
import org.zkoss.zel.VariableMapper;
import org.zkoss.zel.impl.lang.EvaluationContext;
import org.zkoss.zel.impl.util.MessageFactory;
import org.zkoss.zel.impl.util.Validation;
/**
* @author Jacob Hookom [[email protected]]
*/
public final class AstIdentifier extends SimpleNode {
public AstIdentifier(int id) {
super(id);
}
public Class getType(EvaluationContext ctx) throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.getType(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
ctx.putContext(AstIdentifier.class, Integer.valueOf(jjtGetNumSiblings())); //20110909, henrichen: might be one variable series, see AstValue
ctx.putContext(Node.class, this); //20110909, henrichen: might be one variable series, see AstValue
Class result = ctx.getELResolver().getType(ctx, null, this.image);
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.resolver.unhandled.null", this.image));
}
return result;
}
public Object getValue(EvaluationContext ctx) throws ELException {
// Lambda parameters
if (ctx.isLambdaArgument(this.image)) {
return ctx.getLambdaArgument(this.image);
}
// Variable mapper
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.getValue(ctx.getELContext());
}
}
// EL Resolvers
ctx.setPropertyResolved(false);
ctx.putContext(AstIdentifier.class, Integer.valueOf(jjtGetNumSiblings())); //20110909, henrichen: might be one variable series, see AstValue
ctx.putContext(Node.class, this); //20110909, henrichen: might be one variable series, see AstValue
Object result = ctx.getELResolver().getValue(ctx, null, this.image);
if (ctx.isPropertyResolved()) {
return result;
}
// Import
result = ctx.getImportHandler().resolveClass(this.image);
if (result != null) {
return new ELClass((Class) result);
}
result = ctx.getImportHandler().resolveStatic(this.image);
if (result != null) {
try {
return ((Class) result).getField(this.image).get(null);
} catch (IllegalArgumentException e) {
throw new ELException(e);
} catch (IllegalAccessException e) {
throw new ELException(e);
} catch (NoSuchFieldException e) {
throw new ELException(e);
} catch (SecurityException e) {
throw new ELException(e);
}
}
//user can set property as resolved to hide null type exception, default is true
String hideException = System.getProperty("org.zkoss.zel.hideNullTypeException");
if (hideException == null || "true".equals(hideException.toLowerCase())) {
ctx.setPropertyResolved(true);
}
//in order to support static method, we can't set property resolved
//inside XelELResolver.resolve(), and shouldn't throw exception here
return null;
}
public boolean isReadOnly(EvaluationContext ctx) throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.isReadOnly(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
boolean result = ctx.getELResolver().isReadOnly(ctx, null, this.image);
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.resolver.unhandled.null", this.image));
}
return result;
}
public void setValue(EvaluationContext ctx, Object value)
throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
expr.setValue(ctx.getELContext(), value);
return;
}
}
ctx.setPropertyResolved(false);
ctx.putContext(AstIdentifier.class, Integer.valueOf(jjtGetNumSiblings())); //20110909, henrichen: might be one variable series, see AstValue
ctx.putContext(Node.class, this); //20110909, henrichen: might be one variable series, see AstValue
ctx.getELResolver().setValue(ctx, null, this.image, value);
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.resolver.unhandled.null", this.image));
}
}
public Object invoke(EvaluationContext ctx, Class[] paramTypes,
Object[] paramValues) throws ELException {
return this.getMethodExpression(ctx).invoke(ctx.getELContext(), paramValues);
}
public MethodInfo getMethodInfo(EvaluationContext ctx,
Class[] paramTypes) throws ELException {
return this.getMethodExpression(ctx).getMethodInfo(ctx.getELContext());
}
public void setImage(String image) {
if (!Validation.isIdentifier(image)) {
throw new ELException(MessageFactory.get("error.identifier.notjava",
image));
}
this.image = image;
}
public ValueReference getValueReference(EvaluationContext ctx) {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper == null) {
return null;
}
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr == null) {
return null;
}
return expr.getValueReference(ctx);
}
private final MethodExpression getMethodExpression(EvaluationContext ctx)
throws ELException {
Object obj = null;
// case A: ValueExpression exists, getValue which must
// be a MethodExpression
VariableMapper varMapper = ctx.getVariableMapper();
ValueExpression ve = null;
if (varMapper != null) {
ve = varMapper.resolveVariable(this.image);
if (ve != null) {
obj = ve.getValue(ctx);
}
}
// case B: evaluate the identity against the ELResolver, again, must be
// a MethodExpression to be able to invoke
if (ve == null) {
ctx.setPropertyResolved(false);
obj = ctx.getELResolver().getValue(ctx, null, this.image);
}
// finally provide helpful hints
if (obj instanceof MethodExpression) {
return (MethodExpression) obj;
} else if (obj == null) {
throw new MethodNotFoundException("Identity '" + this.image
+ "' was null and was unable to invoke");
} else {
throw new ELException(
"Identity '"
+ this.image
+ "' does not reference a MethodExpression instance, returned type: "
+ obj.getClass().getName());
}
}
}