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/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2009 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.resourceloader.loader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import org.pentaho.reporting.libraries.resourceloader.ResourceData;
import org.pentaho.reporting.libraries.resourceloader.ResourceLoadingException;
import org.pentaho.reporting.libraries.resourceloader.ResourceManager;
import org.pentaho.reporting.libraries.base.util.IOUtils;
/**
* Creation-Date: 05.04.2006, 15:24:47
*
* @author Thomas Morgner
*/
public abstract class AbstractResourceData implements ResourceData, Serializable
{
private static final long serialVersionUID = -2578855461270413802L;
protected AbstractResourceData()
{
}
public byte[] getResource(final ResourceManager caller)
throws ResourceLoadingException
{
try
{
final InputStream in = getResourceAsStream(caller);
if (in == null)
{
throw new ResourceLoadingException("Unable to read Stream: No input stream: " + getKey());
}
try
{
final ByteArrayOutputStream bout = new ByteArrayOutputStream();
IOUtils.getInstance().copyStreams(in, bout);
return bout.toByteArray();
}
finally
{
in.close();
}
}
catch (ResourceLoadingException rle)
{
throw rle;
}
catch (IOException e)
{
throw new ResourceLoadingException("Unable to read Stream: ", e);
}
}
public long getLength()
{
final Object attribute = getAttribute(CONTENT_LENGTH);
if (attribute instanceof Number)
{
final Number length = (Number) attribute;
return length.longValue();
}
return -1;
}
public int getResource(final ResourceManager caller,
final byte[] target,
final long offset,
final int length) throws ResourceLoadingException
{
try
{
if (target == null)
{
throw new NullPointerException();
}
if (target.length < length)
{
throw new IndexOutOfBoundsException("Requested end-position is greater than ");
}
final InputStream in = getResourceAsStream(caller);
if (in == null)
{
throw new ResourceLoadingException("Unable to read Stream: No input stream: " + getKey());
}
try
{
if (offset > 0)
{
long toBeSkipped = offset;
long skipResult = in.skip(toBeSkipped);
toBeSkipped -= skipResult;
while (skipResult > 0 && toBeSkipped > 0)
{
skipResult = in.skip(offset);
toBeSkipped -= skipResult;
}
if (toBeSkipped > 0)
{
// failed to read up to the offset ..
throw new ResourceLoadingException
("Unable to read Stream: Skipping content failed: " + getKey());
}
}
int bytesToRead = length;
// the input stream does not supply accurate available() data
// the zip entry does not know the size of the data
int bytesRead = in.read(target, length - bytesToRead, bytesToRead);
while (bytesRead > -1 && bytesToRead > 0)
{
bytesToRead -= bytesRead;
bytesRead = in.read(target, length - bytesToRead, bytesToRead);
}
return length - bytesRead;
}
finally
{
in.close();
}
}
catch (ResourceLoadingException rle)
{
throw rle;
}
catch (IOException e)
{
throw new ResourceLoadingException("Unable to read Stream: ", e);
}
}
}
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