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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.el;
import javax.el.ELException;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.PropertyNotFoundException;
import javax.faces.el.PropertyResolver;
import java.lang.reflect.Array;
import java.util.List;
import com.sun.faces.util.MessageUtils;
/**
*
* Concrete implementation of PropertyResolver.
*
*/
@SuppressWarnings("deprecation")
public class PropertyResolverImpl extends PropertyResolver {
private PropertyResolver delegate;
// ------------------------------------------- Methods from PropertyResolver
// Specified by javax.faces.el.PropertyResolver.getType(Object,int)
@Override
public Class getType(Object base, int index)
throws EvaluationException, PropertyNotFoundException{
// validates base != null and index >= 0
assertInput(base, index);
if (delegate != null) {
return delegate.getType(base, index);
}
Class type = base.getClass();
try {
if (type.isArray()) {
Array.get(base, index);
return type.getComponentType();
} else if (base instanceof List) {
Object value = ((List) base).get(index);
return (value != null) ? value.getClass() : null;
} else {
throw new PropertyNotFoundException(MessageUtils.getExceptionMessageString(
MessageUtils.EL_PROPERTY_TYPE_ERROR_ID,
base));
}
} catch (ArrayIndexOutOfBoundsException aioobe) {
throw new PropertyNotFoundException(MessageUtils.getExceptionMessageString(
MessageUtils.EL_SIZE_OUT_OF_BOUNDS_ERROR_ID,
base,
index,
Array.getLength(base)));
} catch (IndexOutOfBoundsException ioobe) {
throw new PropertyNotFoundException(MessageUtils.getExceptionMessageString(
MessageUtils.EL_SIZE_OUT_OF_BOUNDS_ERROR_ID,
base,
index,
((List)base).size()));
}
}
// Specified by javax.faces.el.PropertyResolver.getType(Object,String)
@Override
public Class getType(Object base, Object property) {
assertInput(base, property);
if (delegate != null) {
return delegate.getType(base, property);
}
try {
FacesContext context = FacesContext.getCurrentInstance();
return context.getApplication().getELResolver().getType(context.getELContext(), base,property);
} catch (javax.el.PropertyNotFoundException pnfe) {
throw new PropertyNotFoundException(pnfe);
} catch (ELException elex) {
throw new EvaluationException(elex);
}
}
// Specified by javax.faces.el.PropertyResolver.getValue(Object,int)
@Override
public Object getValue(Object base, int index) {
// validates base and index
if (base == null) {
return null;
}
if (delegate != null) {
return delegate.getValue(base, index);
}
if (base.getClass().isArray()) {
try {
return Array.get(base, index);
} catch (ArrayIndexOutOfBoundsException aioobe) {
return null;
}
} else if (base instanceof List) {
try {
return ((List) base).get(index);
} catch (IndexOutOfBoundsException ioobe) {
return null;
}
} else {
throw new PropertyNotFoundException(MessageUtils.getExceptionMessageString(
MessageUtils.EL_PROPERTY_TYPE_ERROR_ID,
base));
}
}
// Specified by javax.faces.el.PropertyResolver.getValue(Object,String)
@Override
public Object getValue(Object base, Object property) {
if (delegate != null) {
return delegate.getValue(base, property);
}
try {
FacesContext context = FacesContext.getCurrentInstance();
return context.getApplication().getELResolver().getValue(context.getELContext(), base,property);
} catch (javax.el.PropertyNotFoundException pnfe) {
throw new PropertyNotFoundException(pnfe);
} catch (ELException elex) {
throw new EvaluationException(elex);
}
}
// Specified by javax.faces.el.PropertyResolver.isReadOnly(Object,int)
@Override
public boolean isReadOnly(Object base, int index) {
// validate input
assertInput(base, index);
if (delegate != null) {
return delegate.isReadOnly(base, index);
}
if (base instanceof List || base.getClass().isArray()) {
return false;
} else {
throw new PropertyNotFoundException(MessageUtils.getExceptionMessageString(
MessageUtils.EL_PROPERTY_TYPE_ERROR_ID,
base));
}
}
// Specified by javax.faces.el.PropertyResolver.isReadOnly(Object,String)
@Override
public boolean isReadOnly(Object base, Object property) {
if (delegate != null) {
return delegate.isReadOnly(base, property);
}
try {
FacesContext context = FacesContext.getCurrentInstance();
return context.getApplication().getELResolver().isReadOnly(context.getELContext(), base,property);
} catch (ELException elex) {
throw new EvaluationException(elex);
}
}
// Specified by javax.faces.el.PropertyResolver.setValue(Object,int,Object)
@Override
public void setValue(Object base, int index, Object value) {
// validate input
assertInput(base, index);
if (delegate != null) {
delegate.setValue(base, index, value);
return;
}
FacesContext context = FacesContext.getCurrentInstance();
Class type = base.getClass();
if (type.isArray()) {
try {
Array.set(base, index, (context.getApplication().
getExpressionFactory()).coerceToType(value, type
.getComponentType()));
}
catch (ArrayIndexOutOfBoundsException aioobe) {
throw new PropertyNotFoundException(MessageUtils.getExceptionMessageString(
MessageUtils.EL_SIZE_OUT_OF_BOUNDS_ERROR_ID,
base,
index,
Array.getLength(base)));
}
} else if (base instanceof List) {
try {
// Inherently not type safe, but nothing can be done about it.
//noinspection unchecked
((List) base).set(index, value);
} catch (IndexOutOfBoundsException ioobe) {
throw new PropertyNotFoundException(MessageUtils.getExceptionMessageString(
MessageUtils.EL_SIZE_OUT_OF_BOUNDS_ERROR_ID,
base,
index,
((List)base).size()));
}
} else {
throw new PropertyNotFoundException(MessageUtils.getExceptionMessageString(
MessageUtils.EL_PROPERTY_TYPE_ERROR_ID,
base));
}
}
// Specified by
// javax.faces.el.PropertyResolver.setValue(Object,String,Object)
@Override
public void setValue(Object base, Object property, Object value) {
if (delegate != null) {
delegate.setValue(base, property, value);
return;
}
try {
FacesContext context = FacesContext.getCurrentInstance();
context.getApplication().getELResolver().setValue(context.getELContext(), base,property, value);
} catch (javax.el.PropertyNotFoundException | javax.el.PropertyNotWritableException pnfe) {
throw new PropertyNotFoundException(pnfe);
}
catch (ELException elex) {
throw new EvaluationException(elex);
}
}
// ---------------------------------------------------------- Public Methods
public void setDelegate(PropertyResolver delegate) {
this.delegate = delegate;
}
protected static void assertInput(Object base, Object property)
throws PropertyNotFoundException {
if (base == null) {
String message = MessageUtils.getExceptionMessageString
(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "base");
throw new PropertyNotFoundException(message);
}
if (property == null) {
String message = MessageUtils.getExceptionMessageString
(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "property");
throw new PropertyNotFoundException(message);
}
}
protected static void assertInput(Object base, int index)
throws PropertyNotFoundException {
if (base == null) {
String message = MessageUtils.getExceptionMessageString
(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "base");
throw new PropertyNotFoundException(message);
}
if (index < 0) {
throw new PropertyNotFoundException(MessageUtils.getExceptionMessageString(
MessageUtils.EL_OUT_OF_BOUNDS_ERROR_ID,
base,
index));
}
}
}