/*
* Copyright 2004, 2005, 2006 Odysseus Software GmbH
*
* 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 de.odysseus.calyxo.base.access;
import javax.servlet.http.HttpServletRequest;
import de.odysseus.calyxo.base.util.MapFacade;
/**
* Base class for accessors, that produce a lookup map.
*
* @author Christoph Beck
*/
public abstract class DynamicMapAccessor implements Accessor {
/**
* Produce a lookup map which delegates calls to
* <code>get(Object)</code> to outer class method
* <code>get(HttpServletRequest, Object)</code> and calls
* to <code>toString()</code> to outer class method
* <code>@link #toString(HttpServletRequest)</code>
*/
public final Object get(final HttpServletRequest request) {
return new MapFacade() {
public Object get(Object key) {
return DynamicMapAccessor.this.get(request, key);
}
public String toString() {
return DynamicMapAccessor.this.toString(request);
}
};
}
/**
* Lookup method.
* To be implemented by subclasses.
*/
protected abstract Object get(HttpServletRequest request, Object key);
/**
* This implementation simply delegates to <code>toString()</code>
* May be overwritten by subclasses.
*/
protected String toString(HttpServletRequest request) {
return toString();
}
/**
* @return <code>true</code>
*/
public boolean isCacheable() {
return true;
}
}