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/**
* ================================================
* LibLoader : a free Java resource loading library
* ================================================
*
* Project Info: http://reporting.pentaho.org/libloader/
*
* (C) Copyright 2006, by Pentaho Corporation and Contributors.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
*
* ------------
* $Id: ResourceKey.java 3520 2007-10-16 10:34:47Z tmorgner $
* ------------
* (C) Copyright 2006, by Pentaho Corporation.
*/
package org.jfree.resourceloader;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Arrays;
/**
* The key is an unique identifier for the resource. Most of the time,
* this may be an URL, but other (especially database based) schemas are
* possible.
*
* A resource key must provide an 'equals' implementation. ResourceKeys should
* be implemented as immutable classes, so that they can be safely stored in
* collections or on external storages (like caches).
*
* @author Thomas Morgner
*/
public final class ResourceKey implements Serializable
{
private static final Map EMPTY_MAP =
Collections.unmodifiableMap(new HashMap());
private Map factoryParameters;
private Integer hashCode;
private Object schema;
private Object identifier;
private ResourceKey parent;
public ResourceKey(final Object schema,
final Object identifier,
final Map factoryParameters)
{
if (schema == null)
{
throw new NullPointerException();
}
if (identifier == null)
{
throw new NullPointerException();
}
this.schema = schema;
this.identifier = identifier;
if (factoryParameters != null)
{
this.factoryParameters =
Collections.unmodifiableMap(new HashMap(factoryParameters));
}
else
{
this.factoryParameters = EMPTY_MAP;
}
}
public ResourceKey(final ResourceKey parent,
final Object schema,
final Object identifier,
final Map factoryParameters)
{
this(schema, identifier, factoryParameters);
this.parent = parent;
}
public ResourceKey getParent()
{
return parent;
}
public Map getFactoryParameters ()
{
return factoryParameters;
}
public boolean equals(final Object o)
{
if (this == o)
{
return true;
}
if (o == null || getClass() != o.getClass())
{
return false;
}
final ResourceKey that = (ResourceKey) o;
if (!schema.equals(that.schema))
{
return false;
}
if (!factoryParameters.equals(that.factoryParameters))
{
return false;
}
if (!identifier.equals(that.identifier))
{
if (identifier instanceof byte[] && that.identifier instanceof byte[])
{
final byte[] me = (byte[]) identifier;
final byte[] he = (byte[]) that.identifier;
Arrays.equals(me, he);
}
return false;
}
return true;
}
public int hashCode()
{
if (hashCode == null)
{
int result = factoryParameters.hashCode();
result = 29 * result + schema.hashCode();
result = 29 * result + identifier.hashCode();
hashCode = new Integer(result);
}
return hashCode.intValue();
}
public Object getIdentifier()
{
return identifier;
}
/**
* Returns the schema of this resource key. The schema is an internal
* identifier to locate the resource-loader implementation that was
* responsible for creating the key in the first place.
*
* The schema has no meaning outside the resource loading framework.
*
* @return
*/
public Object getSchema ()
{
return schema;
}
public String toString()
{
return "ResourceKey{" +
"schema=" + schema +
", identifier=" + identifier +
", factoryParameters=" + factoryParameters +
", parent=" + parent +
'}';
}
}
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