com.sun.el.parser.AstValue Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.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.ValueReference;
import javax.el.ELClass;
import javax.el.PropertyNotFoundException;
import javax.el.PropertyNotWritableException;
import javax.el.ImportHandler;
import com.sun.el.lang.EvaluationContext;
import com.sun.el.lang.ELSupport;
import com.sun.el.util.MessageFactory;
import com.sun.el.util.ReflectionUtil;
/**
* @author Jacob Hookom [[email protected]]
* @author Kin-man Chung
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
*/
public final class AstValue extends SimpleNode {
protected static class Target {
protected Object base;
protected Node suffixNode;
Target(Object base, Node suffixNode) {
this.base = base;
this.suffixNode = suffixNode;
}
boolean isMethodCall() {
return getArguments(suffixNode) != null;
}
}
public AstValue(int id) {
super(id);
}
public Class getType(EvaluationContext ctx) throws ELException {
Target t = getTarget(ctx);
if (t.isMethodCall()) {
return null;
}
Object property = t.suffixNode.getValue(ctx);
ctx.setPropertyResolved(false);
Class ret = ctx.getELResolver().getType(ctx, t.base, property);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(t.base, property);
}
return ret;
}
public ValueReference getValueReference(EvaluationContext ctx)
throws ELException {
Target t = getTarget(ctx);
if (t.isMethodCall()) {
return null;
}
Object property = t.suffixNode.getValue(ctx);
return new ValueReference(t.base, property);
}
private static AstMethodArguments getArguments(Node n) {
if (n instanceof AstDotSuffix && n.jjtGetNumChildren() > 0) {
return (AstMethodArguments) n.jjtGetChild(0);
}
if (n instanceof AstBracketSuffix && n.jjtGetNumChildren() > 1) {
return (AstMethodArguments) n.jjtGetChild(1);
}
return null;
}
private Object getValue(Object base, Node child, EvaluationContext ctx)
throws ELException {
Object value = null;
ELResolver resolver = ctx.getELResolver();
Object property = child.getValue(ctx);
AstMethodArguments args = getArguments(child);
if (args != null) {
// This is a method call
if (! (property instanceof String)) {
throw new ELException(MessageFactory.get(
"error.method.name", property));
}
Class[] paramTypes = args.getParamTypes();
Object[] params = args.getParameters(ctx);
ctx.setPropertyResolved(false);
value = resolver.invoke(ctx, base, property, paramTypes, params);
} else {
if (property != null) {
ctx.setPropertyResolved(false);
value = resolver.getValue(ctx, base, property);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(base, property);
}
}
}
return value;
}
private final Object getBase(EvaluationContext ctx) {
try {
return this.children[0].getValue(ctx);
} catch (PropertyNotFoundException ex) {
// Next check if the base is an imported class
if (this.children[0] instanceof AstIdentifier) {
String name = ((AstIdentifier) this.children[0]).image;
ImportHandler importHandler = ctx.getImportHandler();
if (importHandler != null) {
Class c = importHandler.resolveClass(name);
if (c != null) {
return new ELClass(c);
}
}
}
throw ex;
}
}
private final Target getTarget(EvaluationContext ctx) throws ELException {
// evaluate expr-a to value-a
Object base = getBase(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
if (propCount > 1) {
while (base != null && i < propCount) {
base = getValue(base, this.children[i], ctx);
i++;
}
// if we are in this block, we have more properties to resolve,
// but our base was null
if (base == null) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.unreachable.property", property));
}
}
return new Target(base, this.children[propCount]);
}
public Object getValue(EvaluationContext ctx) throws ELException {
Object base = getBase(ctx);
int propCount = this.jjtGetNumChildren();
int i = 1;
while (base != null && i < propCount) {
base = getValue(base, this.children[i], ctx);
i++;
}
return base;
}
public boolean isReadOnly(EvaluationContext ctx) throws ELException {
Target t = getTarget(ctx);
if (t.isMethodCall()) {
return true;
}
Object property = t.suffixNode.getValue(ctx);
ctx.setPropertyResolved(false);
boolean ret = ctx.getELResolver().isReadOnly(ctx, t.base, property);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(t.base, property);
}
return ret;
}
public void setValue(EvaluationContext ctx, Object value)
throws ELException {
Target t = getTarget(ctx);
if (t.isMethodCall()) {
throw new PropertyNotWritableException(
MessageFactory.get("error.syntax.set"));
}
Object property = t.suffixNode.getValue(ctx);
ctx.setPropertyResolved(false);
ELResolver elResolver = ctx.getELResolver();
value = ctx.convertToType(value,
elResolver.getType(ctx, t.base, property));
elResolver.setValue(ctx, t.base, property, value);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(t.base, property);
}
}
public MethodInfo getMethodInfo(EvaluationContext ctx, Class[] paramTypes)
throws ELException {
Target t = getTarget(ctx);
if (t.isMethodCall()) {
return null;
}
Object property = t.suffixNode.getValue(ctx);
Method m = ReflectionUtil.getMethod(t.base, 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);
if (t.isMethodCall()) {
AstMethodArguments args = getArguments(t.suffixNode);
// Always use the param types in the expression, and ignore those
// specified elsewhere, such as TLD
paramTypes = args.getParamTypes();
Object[] params = args.getParameters(ctx);
String method = (String) t.suffixNode.getValue(ctx);
ctx.setPropertyResolved(false);
ELResolver resolver = ctx.getELResolver();
return resolver.invoke(ctx, t.base, method, paramTypes, params);
}
Object property = t.suffixNode.getValue(ctx);
Method m = ReflectionUtil.getMethod(t.base, property, paramTypes);
Object result = null;
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;
}
@Override
public boolean isParametersProvided() {
return getArguments(this.children[this.jjtGetNumChildren()-1]) != null;
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy