/*
* 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. AstValue.java */
package org.apache.el.parser;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.el.ELException;
import javax.el.ELResolver;
import javax.el.MethodInfo;
import javax.el.PropertyNotFoundException;
import javax.el.ValueReference;
import org.apache.el.lang.ELSupport;
import org.apache.el.lang.EvaluationContext;
import org.apache.el.util.MessageFactory;
import org.apache.el.util.ReflectionUtil;
/**
* @author Jacob Hookom [jacob@hookom.net]
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: remy.maucherat@jboss.com $
*/
public final class AstValue extends SimpleNode {
protected static final boolean COERCE_TO_ZERO =
Boolean.valueOf(System.getProperty(
"org.apache.el.parser.COERCE_TO_ZERO", "true")).booleanValue();
protected static class Target {
protected Object base;
protected Object property;
}
public AstValue(int id) {
super(id);
}
public Class getType(EvaluationContext ctx) throws ELException {
Target t = getTarget(ctx);
ctx.setPropertyResolved(false);
return ctx.getELResolver().getType(ctx, t.base, t.property);
}
public ValueReference getValueReference(EvaluationContext ctx) {
try {
Target t = getTarget(ctx);
return new ValueReference(t.base, t.property);
} catch (Exception e) {
return null;
}
}
private final Target getTarget(EvaluationContext ctx) throws ELException {
// evaluate expr-a to value-a
Object base = this.children[0].getValue(ctx);
// if our base is null (we know there are more properites to evaluate)
if (base == null) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.unreachable.base", this.children[0].getImage()));
}
// set up our start/end
Object property = null;
int propCount = this.jjtGetNumChildren() - 1;
int i = 1;
// evaluate any properties before our target
ELResolver resolver = ctx.getELResolver();
if (propCount > 1) {
while (base != null && i < propCount) {
property = this.children[i].getValue(ctx);
ctx.setPropertyResolved(false);
base = resolver.getValue(ctx, base, property);
i++;
}
// if we are in this block, we have more properties to resolve,
// but our base was null
if (base == null || property == null) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.unreachable.property", property));
}
}
property = this.children[i].getValue(ctx);
if (property == null) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.unreachable.property", this.children[i]));
}
Target t = new Target();
t.base = base;
t.property = property;
return t;
}
public Object getValue(EvaluationContext ctx) throws ELException {
Object base = this.children[0].getValue(ctx);
int propCount = this.jjtGetNumChildren();
int i = 1;
Object property = null;
ELResolver resolver = ctx.getELResolver();
while (base != null && i < propCount) {
property = this.children[i].getValue(ctx);
if (property == null) {
return null;
} else {
Object[] params = null;
if (this.children[i] instanceof AstDotSuffix) {
params = ((AstDotSuffix) this.children[i]).getParameters(ctx);
}
if (params != null && params.length > 0) {
ctx.setPropertyResolved(false);
base = resolver.invoke(ctx, base, property, null, params);
} else {
ctx.setPropertyResolved(false);
base = resolver.getValue(ctx, base, property);
}
}
i++;
}
return base;
}
public boolean isReadOnly(EvaluationContext ctx) throws ELException {
Target t = getTarget(ctx);
ctx.setPropertyResolved(false);
return ctx.getELResolver().isReadOnly(ctx, t.base, t.property);
}
public void setValue(EvaluationContext ctx, Object value)
throws ELException {
Target t = getTarget(ctx);
ctx.setPropertyResolved(false);
ELResolver resolver = ctx.getELResolver();
// coerce to the expected type
Class<?> targetClass = resolver.getType(ctx, t.base, t.property);
if (COERCE_TO_ZERO
|| !isAssignable(value, targetClass)) {
value = ELSupport.coerceToType(value, targetClass);
}
resolver.setValue(ctx, t.base, t.property, value);
}
private boolean isAssignable(Object value, Class<?> targetClass) {
if (targetClass == null) {
return false;
} else if (value != null && targetClass.isPrimitive()) {
return false;
} else if (value != null && !targetClass.isInstance(value)) {
return false;
}
return true;
}
public MethodInfo getMethodInfo(EvaluationContext ctx, Class[] paramTypes)
throws ELException {
Target t = getTarget(ctx);
Method m = ReflectionUtil.getMethod(t.base, t.property, paramTypes);
return new MethodInfo(m.getName(), m.getReturnType(), m
.getParameterTypes());
}
public Object invoke(EvaluationContext ctx, Class[] paramTypes,
Object[] paramValues) throws ELException {
Target t = getTarget(ctx);
Object[] params = null;
if (jjtGetNumChildren() > 1 && this.children[1] instanceof AstDotSuffix) {
params = ((AstDotSuffix) this.children[1]).getParameters(ctx);
}
Object result = null;
if (params != null && params.length > 0) {
ELResolver resolver = ctx.getELResolver();
ctx.setPropertyResolved(false);
result = resolver.invoke(ctx, t.base, t.property, null, params);
} else {
Method m = ReflectionUtil.getMethod(t.base, t.property, paramTypes);
try {
result = m.invoke(t.base, (Object[]) paramValues);
} catch (IllegalAccessException iae) {
throw new ELException(iae);
} catch (InvocationTargetException ite) {
throw new ELException(ite.getCause());
}
}
return result;
}
public boolean isParametersProvided() {
if (jjtGetNumChildren() > 1 && this.children[1] != null &&
this.children[1] instanceof AstDotSuffix) {
return (this.children[1].jjtGetNumChildren()) > 0;
}
return false;
}
}