Package de.odysseus.calyxo.base.access

Source Code of de.odysseus.calyxo.base.access.DynamicMapAccessor

/*
* 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;
  }
}
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