/*
* Copyright 2009 Prime Technology.
*
* Licensed 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.
*/
package org.primefaces.facelets;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.MethodBinding;
import javax.faces.el.MethodNotFoundException;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.MetaRule;
import javax.faces.view.facelets.Metadata;
import javax.faces.view.facelets.MetadataTarget;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagAttributeException;
/**
* Optional Rule for binding Method[Binding|Expression] properties
*
* @author Mike Kienenberger
* @author Jacob Hookom
*
* Implementation copied from Facelets 1.1.14, as it got hidden by JSF 2.0
*/
public class MethodRule extends MetaRule {
private final String methodName;
private final Class returnTypeClass;
private final Class[] params;
public MethodRule(String methodName, Class returnTypeClass,
Class[] params) {
this.methodName = methodName;
this.returnTypeClass = returnTypeClass;
this.params = params;
}
public Metadata applyRule(String name, TagAttribute attribute,
MetadataTarget meta) {
if (false == name.equals(this.methodName))
return null;
if (MethodBinding.class.equals(meta.getPropertyType(name))) {
Method method = meta.getWriteMethod(name);
if (method != null) {
return new MethodBindingMetadata(method, attribute,
this.returnTypeClass,
this.params);
}
} else if (MethodExpression.class.equals(meta.getPropertyType(name))) {
Method method = meta.getWriteMethod(name);
if (method != null) {
return new MethodExpressionMetadata(method, attribute,
this.returnTypeClass,
this.params);
}
}
return null;
}
private static class MethodBindingMetadata extends Metadata {
private final Method _method;
private final TagAttribute _attribute;
private Class[] _paramList;
private Class _returnType;
public MethodBindingMetadata(Method method, TagAttribute attribute,
Class returnType, Class[] paramList) {
_method = method;
_attribute = attribute;
_paramList = paramList;
_returnType = returnType;
}
public void applyMetadata(FaceletContext ctx, Object instance) {
MethodExpression expr =
_attribute.getMethodExpression(ctx, _returnType, _paramList);
try {
_method.invoke(instance,
new Object[] { new LegacyMethodBinding(expr) });
} catch (InvocationTargetException e) {
throw new TagAttributeException(_attribute, e.getCause());
} catch (Exception e) {
throw new TagAttributeException(_attribute, e);
}
}
}
private static class MethodExpressionMetadata extends Metadata {
private final Method _method;
private final TagAttribute _attribute;
private Class[] _paramList;
private Class _returnType;
public MethodExpressionMetadata(Method method, TagAttribute attribute,
Class returnType, Class[] paramList) {
_method = method;
_attribute = attribute;
_paramList = paramList;
_returnType = returnType;
}
public void applyMetadata(FaceletContext ctx, Object instance) {
MethodExpression expr =
_attribute.getMethodExpression(ctx, _returnType, _paramList);
try {
_method.invoke(instance, new Object[] { expr });
} catch (InvocationTargetException e) {
throw new TagAttributeException(_attribute, e.getCause());
} catch (Exception e) {
throw new TagAttributeException(_attribute, e);
}
}
}
private static class LegacyMethodBinding extends MethodBinding implements Serializable {
private static final long serialVersionUID = 1L;
private final MethodExpression m;
public LegacyMethodBinding(MethodExpression m) {
this.m = m;
}
/*
* (non-Javadoc)
*
* @see javax.faces.el.MethodBinding#getType(javax.faces.context.FacesContext)
*/
public Class getType(FacesContext context) throws MethodNotFoundException {
try {
return m.getMethodInfo(context.getELContext()).getReturnType();
} catch (javax.el.MethodNotFoundException e) {
throw new MethodNotFoundException(e.getMessage(),
e.getCause());
} catch (ELException e) {
throw new EvaluationException(e.getMessage(), e.getCause());
}
}
/*
* (non-Javadoc)
*
* @see javax.faces.el.MethodBinding#invoke(javax.faces.context.FacesContext,
* java.lang.Object[])
*/
public Object invoke(FacesContext context,
Object[] params) throws EvaluationException,
MethodNotFoundException {
try {
return m.invoke(context.getELContext(), params);
} catch (javax.el.MethodNotFoundException e) {
throw new MethodNotFoundException(e.getMessage(),
e.getCause());
} catch (ELException e) {
throw new EvaluationException(e.getMessage(), e.getCause());
}
}
public String getExpressionString() {
return m.getExpressionString();
}
}
}