/*
* 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.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
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 $Id: AstValue.java 987958 2010-08-22 23:11:18Z markt $
*/
public final class AstValue extends SimpleNode {
private static final boolean IS_SECURITY_ENABLED =
(System.getSecurityManager() != null);
protected static final boolean COERCE_TO_ZERO;
static {
if (IS_SECURITY_ENABLED) {
COERCE_TO_ZERO = AccessController.doPrivileged(
new PrivilegedAction<Boolean>(){
@Override
public Boolean run() {
return Boolean.valueOf(System.getProperty(
"org.apache.el.parser.COERCE_TO_ZERO",
"true"));
}
}
).booleanValue();
} else {
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);
}
@Override
public Class<?> getType(EvaluationContext ctx) throws ELException {
Target t = getTarget(ctx);
ctx.setPropertyResolved(false);
Class<?> result = ctx.getELResolver().getType(ctx, t.base, t.property);
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.resolver.unhandled", t.base, t.property));
}
return result;
}
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 properties 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();
if (propCount > 2 &&
this.jjtGetChild(propCount - 1) instanceof AstMethodParameters) {
// Method call with paramaters.
propCount-=2;
} else {
propCount--;
}
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;
}
@Override
public Object getValue(EvaluationContext ctx) throws ELException {
Object base = this.children[0].getValue(ctx);
int propCount = this.jjtGetNumChildren();
int i = 1;
Object suffix = null;
ELResolver resolver = ctx.getELResolver();
while (base != null && i < propCount) {
suffix = this.children[i].getValue(ctx);
if (i + 1 < propCount &&
(this.children[i+1] instanceof AstMethodParameters)) {
AstMethodParameters mps =
(AstMethodParameters) this.children[i+1];
// This is a method
base = resolver.invoke(ctx, base, suffix,
mps.getParameterTypes(ctx), mps.getParameters(ctx));
i+=2;
} else {
// This is a property
if (suffix == null) {
return null;
}
ctx.setPropertyResolved(false);
base = resolver.getValue(ctx, base, suffix);
i++;
}
}
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.resolver.unhandled", base, suffix));
}
return base;
}
@Override
public boolean isReadOnly(EvaluationContext ctx) throws ELException {
Target t = getTarget(ctx);
ctx.setPropertyResolved(false);
boolean result =
ctx.getELResolver().isReadOnly(ctx, t.base, t.property);
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.resolver.unhandled", t.base, t.property));
}
return result;
}
@Override
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 == true
|| !isAssignable(value, targetClass)) {
resolver.setValue(ctx, t.base, t.property,
ELSupport.coerceToType(value, targetClass));
} else {
resolver.setValue(ctx, t.base, t.property, value);
}
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.resolver.unhandled", t.base, t.property));
}
}
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;
}
@Override
// Interface el.parser.Node uses raw types (and is auto-generated)
public MethodInfo getMethodInfo(EvaluationContext ctx,
@SuppressWarnings("rawtypes") 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());
}
@Override
// Interface el.parser.Node uses a raw type (and is auto-generated)
public Object invoke(EvaluationContext ctx,
@SuppressWarnings("rawtypes") Class[] paramTypes,
Object[] paramValues) throws ELException {
Target t = getTarget(ctx);
Method m = null;
Object[] values = null;
if (isParametersProvided()) {
values = ((AstMethodParameters)
this.jjtGetChild(2)).getParameters(ctx);
Class<?>[] types = getTypesFromValues(values);
m = ReflectionUtil.getMethod(t.base, t.property, types);
} else {
m = ReflectionUtil.getMethod(t.base, t.property, paramTypes);
values = paramValues;
}
if (m.isVarArgs()) {
// May need to convert values
values = toVarArgs(values, m);
}
Object result = null;
try {
result = m.invoke(t.base, values);
} catch (IllegalAccessException iae) {
throw new ELException(iae);
} catch (IllegalArgumentException iae) {
throw new ELException(iae);
} catch (InvocationTargetException ite) {
throw new ELException(ite.getCause());
}
return result;
}
private Object[] toVarArgs(Object[] src, Method m) {
int paramCount = m.getParameterTypes().length;
Object[] dest = new Object[paramCount];
Object[] varArgs = (Object[]) Array.newInstance(
m.getParameterTypes()[paramCount - 1].getComponentType(),
src.length - (paramCount - 1));
System.arraycopy(src, 0, dest, 0, paramCount - 1);
System.arraycopy(src, paramCount - 1, varArgs, 0,
src.length - (paramCount - 1));
dest[paramCount - 1] = varArgs;
return dest;
}
private Class<?>[] getTypesFromValues(Object[] values) {
if (values == null) {
return null;
}
Class<?> result[] = new Class<?>[values.length];
for (int i = 0; i < values.length; i++) {
if (values[i] == null) {
result[i] = null;
} else {
result[i] = values[i].getClass();
}
}
return result;
}
/**
* @since EL 2.2
*/
@Override
public ValueReference getValueReference(EvaluationContext ctx) {
// Check this is a reference to a base and a property
if (this.children.length > 2 &&
this.jjtGetChild(2) instanceof AstMethodParameters) {
// This is a method call
return null;
}
Target t = getTarget(ctx);
return new ValueReference(t.base, t.property);
}
/**
* @since EL 2.2
*/
@Override
public boolean isParametersProvided() {
if (this.children.length > 2
&& this.jjtGetChild(2) instanceof AstMethodParameters) {
return true;
}
return false;
}
}