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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.apache.el.parser;
import javax.el.ELClass;
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.ValueReference;
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 [[email protected]]
*/
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 {
// 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);
Object result;
/*
* Putting the Boolean into the ELContext is part of a performance optimisation for ScopedAttributeELResolver.
* When looking up "foo", the resolver can't differentiate between ${ foo } and ${ foo.bar }. This is important
* because the expensive class lookup only needs to be performed in the later case. This flag tells the resolver
* if the lookup can be skipped.
*/
if (parent instanceof AstValue) {
ctx.putContext(this.getClass(), Boolean.FALSE);
} else {
ctx.putContext(this.getClass(), Boolean.TRUE);
}
try {
result = ctx.getELResolver().getValue(ctx, null, this.image);
} finally {
// Always reset the flag to false so the optimisation is not applied
// inappropriately
ctx.putContext(this.getClass(), Boolean.FALSE);
}
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 | IllegalAccessException | NoSuchFieldException | SecurityException e) {
throw new ELException(e);
}
}
throw new PropertyNotFoundException(MessageFactory.get("error.resolver.unhandled.null", this.image));
}
@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;
}
@Override
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 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(MessageFactory.get("error.identifier.noMethod", this.image));
} else {
throw new ELException(
MessageFactory.get("error.identifier.notMethodExpression", this.image, obj.getClass().getName()));
}
}
}
