Package org.apache.wicket.request.resource

Source Code of org.apache.wicket.request.resource.ContextRelativeResource

/*
* 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.wicket.request.resource;

import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;

import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.request.resource.caching.IStaticCacheableResource;
import org.apache.wicket.util.io.ByteArrayOutputStream;
import org.apache.wicket.util.io.IOUtils;
import org.apache.wicket.util.io.Streams;
import org.apache.wicket.util.resource.IResourceStream;
import org.apache.wicket.util.resource.ResourceStreamNotFoundException;
import org.apache.wicket.core.util.resource.WebExternalResourceStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* Resource served from a file relative to the context root.
*
* @author almaw
*/
public class ContextRelativeResource extends AbstractResource implements IStaticCacheableResource
{
  private static final String CACHE_PREFIX = "context-relative:/";
  private static final long serialVersionUID = 1L;

  private static final Logger log = LoggerFactory.getLogger(ContextRelativeResource.class);

  private final String path;

  /**
   * Construct.
   *
   * @param pathRelativeToContextRoot
   */
  public ContextRelativeResource(String pathRelativeToContextRoot)
  {
    if (pathRelativeToContextRoot == null)
    {
      throw new IllegalArgumentException("Cannot have null path for ContextRelativeResource.");
    }

    // Make sure there is a leading '/'.
    if (!pathRelativeToContextRoot.startsWith("/"))
    {
      pathRelativeToContextRoot = "/" + pathRelativeToContextRoot;
    }
    path = pathRelativeToContextRoot;
  }
 
  @Override
  public Serializable getCacheKey()
  {
    return CACHE_PREFIX + path;
  }

  @Override
  public IResourceStream getCacheableResourceStream()
  {
    return new WebExternalResourceStream(path);
  }
 
  @Override
  protected ResourceResponse newResourceResponse(final Attributes attributes)
  {
    final ResourceResponse resourceResponse = new ResourceResponse();

    if (resourceResponse.dataNeedsToBeWritten(attributes))
    {
      final WebExternalResourceStream webExternalResourceStream =
        new WebExternalResourceStream(path);
      resourceResponse.setContentType(webExternalResourceStream.getContentType());
      resourceResponse.setLastModified(webExternalResourceStream.lastModifiedTime());
      resourceResponse.setFileName(path);
      resourceResponse.setWriteCallback(new WriteCallback()
      {
        @Override
        public void writeData(final Attributes attributes)
        {
          InputStream inputStream = null;
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          try
          {
            inputStream = webExternalResourceStream.getInputStream();
            Streams.copy(inputStream, baos);
            attributes.getResponse().write(baos.toByteArray());
          }
          catch (ResourceStreamNotFoundException rsnfx)
          {
            throw new WicketRuntimeException(rsnfx);
          }
          catch (IOException iox)
          {
            throw new WicketRuntimeException(iox);
          }
          finally
          {
            IOUtils.closeQuietly(inputStream);
            IOUtils.closeQuietly(baos);
          }
        }
      });
    }

    return resourceResponse;
  }

  @Override
  public int hashCode()
  {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((path == null) ? 0 : path.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj)
  {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    ContextRelativeResource other = (ContextRelativeResource)obj;
    if (path == null)
    {
      if (other.path != null)
        return false;
    }
    else if (!path.equals(other.path))
      return false;
    return true;
  }
}
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