/*
* 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.apache.el.parser;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.el.MethodInfo;
import javax.el.MethodNotFoundException;
import javax.el.PropertyNotFoundException;
import javax.el.ValueExpression;
import javax.el.VariableMapper;
import org.apache.el.lang.EvaluationContext;
import org.apache.el.util.MessageFactory;
import org.apache.el.util.Validation;
/**
* @author Jacob Hookom [jacob@hookom.net]
* @version $Id: AstIdentifier.java 1061787 2011-01-21 12:39:15Z markt $
*/
public final class AstIdentifier extends SimpleNode {
public AstIdentifier(int id) {
super(id);
}
@Override
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);
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;
}
@Override
public Object getValue(EvaluationContext ctx) throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.getValue(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
Object result = ctx.getELResolver().getValue(ctx, null, this.image);
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.resolver.unhandled.null", this.image));
}
return result;
}
@Override
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;
}
@Override
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.getELResolver().setValue(ctx, null, this.image, value);
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.resolver.unhandled.null", this.image));
}
}
@Override
public Object invoke(EvaluationContext ctx, Class<?>[] paramTypes,
Object[] paramValues) throws ELException {
return this.getMethodExpression(ctx).invoke(ctx.getELContext(), paramValues);
}
@Override
public MethodInfo getMethodInfo(EvaluationContext ctx,
Class<?>[] paramTypes) throws ELException {
return this.getMethodExpression(ctx).getMethodInfo(ctx.getELContext());
}
@Override
public void setImage(String image) {
if (!Validation.isIdentifier(image)) {
throw new ELException(MessageFactory.get("error.identifier.notjava",
image));
}
this.image = image;
}
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());
}
}
}