/*
 *  Copyright 2011 Uwe Krueger.
 *
 *  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 com.mandelsoft.mand.scan;

import com.mandelsoft.mand.MandelData;
import java.io.IOException;

/**
 *
 * @author Uwe Krueger
 */
public class CachedMandelHandle extends ProxyMandelHandle {
  private MandelData info;
  private MandelData data;

  public CachedMandelHandle(MandelHandle orig)
  {
    super(orig,orig.getName());
  }

  @Override
  public MandelData getInfo() throws IOException
  {
    assertInfo();
    return info;
  }

  @Override
  public MandelData getData() throws IOException
  {
    assertData();
    return data;
  }

  /////////////////////////////////////////////////////////////////////////
  public CachedMandelHandle assertInfo() throws IOException
  {
    if (info==null) {
      if (data==null) {
        info=super.getInfo();
      }
      else {
        info=new MandelData(data.getInfo(),data.getOrigHeader(),getFile());
      }
    }
    return this;
  }

  public CachedMandelHandle assertData() throws IOException
  {
    if (data==null) {
      data=super.getData();
    }
    return this;
  }
}