/*
* $Id: TilesContextVariableResolverFactory.java 817009 2009-09-20 11:26:26Z apetrelli $
*
* 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.
*/
package org.apache.tiles.mvel;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import org.apache.tiles.TilesApplicationContext;
import org.apache.tiles.context.TilesRequestContext;
import org.apache.tiles.context.TilesRequestContextHolder;
import org.apache.tiles.reflect.CannotAccessMethodException;
import org.apache.tiles.util.CombinedBeanInfo;
import org.mvel2.integration.VariableResolver;
import org.mvel2.integration.impl.BaseVariableResolverFactory;
/**
* Resolves {@link org.apache.tiles.context.TilesRequestContext} and
* {@link org.apache.tiles.TilesApplicationContext} properties as variables.
*
* @version $Rev: 817009 $ $Date: 2009-09-20 13:26:26 +0200 (dom, 20 set 2009) $
* @since 2.2.0
*/
public class TilesContextVariableResolverFactory extends
BaseVariableResolverFactory {
/**
* The Tiles request holder.
*/
private TilesRequestContextHolder requestHolder;
/**
* Beaninfo about {@link org.apache.tiles.context.TilesRequestContext} and
* {@link org.apache.tiles.TilesApplicationContext}.
*/
private CombinedBeanInfo requestBeanInfo = new CombinedBeanInfo(
TilesRequestContext.class, TilesApplicationContext.class);
/**
* Constructor.
*
* @param requestHolder The Tiles request holder.
* @since 2.2.0
*/
public TilesContextVariableResolverFactory(TilesRequestContextHolder requestHolder) {
this.requestHolder = requestHolder;
variableResolvers = new HashMap<String, VariableResolver>();
for (PropertyDescriptor descriptor : requestBeanInfo
.getMappedDescriptors(TilesRequestContext.class).values()) {
String descriptorName = descriptor.getName();
variableResolvers.put(descriptorName, new RequestVariableResolver(descriptorName));
}
for (PropertyDescriptor descriptor : requestBeanInfo
.getMappedDescriptors(TilesApplicationContext.class).values()) {
String descriptorName = descriptor.getName();
variableResolvers.put(descriptorName, new ApplicationVariableResolver(descriptorName));
}
}
/** {@inheritDoc} */
public VariableResolver createVariable(String name, Object value) {
if (nextFactory != null) {
return nextFactory.createVariable(name, value);
}
throw new UnsupportedOperationException("This variable resolver factory is read only");
}
/** {@inheritDoc} */
public VariableResolver createVariable(String name, Object value,
Class<?> type) {
if (nextFactory != null) {
return nextFactory.createVariable(name, value, type);
}
throw new UnsupportedOperationException("This variable resolver factory is read only");
}
/** {@inheritDoc} */
public boolean isResolveable(String name) {
if (variableResolvers.containsKey(name)) {
return true;
}
return isNextResolveable(name);
}
/** {@inheritDoc} */
public boolean isTarget(String name) {
return variableResolvers.containsKey(name);
}
/**
* Resolves a {@link org.apache.tiles.context.TilesRequestContext} property as a variable.
*
* @version $Rev: 817009 $ $Date: 2009-09-20 13:26:26 +0200 (dom, 20 set 2009) $
* @since 2.2.0
*/
private class RequestVariableResolver implements VariableResolver {
/**
* The name of the property.
*/
private String name;
/**
* The property descriptor.
*/
private PropertyDescriptor descriptor;
/**
* Constructor.
*
* @param name The name of the property.
* @since 2.2.0
*/
public RequestVariableResolver(String name) {
this.name = name;
descriptor = requestBeanInfo.getMappedDescriptors(
TilesRequestContext.class).get(name);
}
/** {@inheritDoc} */
public int getFlags() {
return 0;
}
/** {@inheritDoc} */
public String getName() {
return name;
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
public Class getType() {
return descriptor.getPropertyType();
}
/** {@inheritDoc} */
public Object getValue() {
Method method = descriptor.getReadMethod();
try {
return method.invoke(requestHolder.getTilesRequestContext());
} catch (IllegalArgumentException e) {
throw new CannotAccessMethodException(
"Arguments are wrong for property '"
+ descriptor.getName() + "'", e);
} catch (IllegalAccessException e) {
throw new CannotAccessMethodException(
"Cannot access getter method for property '"
+ descriptor.getName() + "'", e);
} catch (InvocationTargetException e) {
throw new CannotAccessMethodException(
"The getter method for property '"
+ descriptor.getName() + "' threw an exception",
e);
}
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
public void setStaticType(Class type) {
// Does nothing for the moment.
}
/** {@inheritDoc} */
public void setValue(Object value) {
throw new UnsupportedOperationException("This resolver is read-only");
}
}
/**
* Resolves a {@link org.apache.tiles.TilesApplicationContext} property as a
* variable.
*
* @version $Rev: 817009 $ $Date: 2009-09-20 13:26:26 +0200 (dom, 20 set 2009) $
* @since 2.2.0
*/
private class ApplicationVariableResolver implements VariableResolver {
/**
* The name of the property.
*
* @since 2.2.0
*/
private String name;
/**
* The property descriptor.
*
* @since 2.2.0
*/
private PropertyDescriptor descriptor;
/**
* Constructor.
*
* @param name The name of the property.
* @since 2.2.0
*/
public ApplicationVariableResolver(String name) {
this.name = name;
descriptor = requestBeanInfo.getMappedDescriptors(
TilesApplicationContext.class).get(name);
}
/** {@inheritDoc} */
public int getFlags() {
return 0;
}
/** {@inheritDoc} */
public String getName() {
return name;
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
public Class getType() {
return descriptor.getPropertyType();
}
/** {@inheritDoc} */
public Object getValue() {
Method method = descriptor.getReadMethod();
try {
return method.invoke(requestHolder.getTilesRequestContext()
.getApplicationContext());
} catch (IllegalArgumentException e) {
throw new CannotAccessMethodException(
"Arguments are wrong for property '"
+ descriptor.getName() + "'", e);
} catch (IllegalAccessException e) {
throw new CannotAccessMethodException(
"Cannot access getter method for property '"
+ descriptor.getName() + "'", e);
} catch (InvocationTargetException e) {
throw new CannotAccessMethodException(
"The getter method for property '"
+ descriptor.getName() + "' threw an exception",
e);
}
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
public void setStaticType(Class type) {
// Does nothing for the moment.
}
/** {@inheritDoc} */
public void setValue(Object value) {
throw new UnsupportedOperationException("This resolver is read-only");
}
}
}