/*
* $Header$
* $Revision: 982 $
* $Date: 2006-12-08 18:42:51 +1000 (Fri, 08 Dec 2006) $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2003-2009 The JRDF Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* the JRDF Project (http://jrdf.sf.net/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The JRDF Project" and "JRDF" must not be used to endorse
* or promote products derived from this software without prior written
* permission. For written permission, please contact
* newmana@users.sourceforge.net.
*
* 5. Products derived from this software may not be called "JRDF"
* nor may "JRDF" appear in their names without prior written
* permission of the JRDF Project.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the JRDF Project. For more
* information on JRDF, please see <http://jrdf.sourceforge.net/>.
*
*/
package org.jrdf.util.bdb;
import com.sleepycat.bind.tuple.TupleBinding;
import com.sleepycat.bind.tuple.TupleInput;
import com.sleepycat.bind.tuple.TupleOutput;
import org.jrdf.query.relation.Attribute;
import org.jrdf.query.relation.attributename.AttributeName;
import org.jrdf.query.relation.constants.NullaryAttribute;
import org.jrdf.query.relation.mem.AttributeImpl;
import org.jrdf.query.relation.type.NodeType;
import java.io.Serializable;
/**
* @author Yuan-Fang Li
* @version :$
*/
public class AttributeBinding extends TupleBinding<Attribute> implements Serializable {
private static final long serialVersionUID = -6106464996541411484L;
private static final int NORMAL_ATTRIBUTE = 0;
private static final int NULLARY_ATTRIBUTE = 1;
private TupleBinding<AttributeName> nameBinding = new AttributeNameBinding();
private TupleBinding<NodeType> typeBinding = new NodeTypeBinding();
public Attribute entryToObject(TupleInput tupleInput) {
final byte b = tupleInput.readByte();
Attribute attribute;
if (b == NORMAL_ATTRIBUTE) {
AttributeName name = nameBinding.entryToObject(tupleInput);
NodeType type = typeBinding.entryToObject(tupleInput);
attribute = new AttributeImpl(name, type);
} else if (b == NULLARY_ATTRIBUTE) {
attribute = NullaryAttribute.NULLARY_ATTRIBUTE;
} else {
throw new IllegalArgumentException("Cannot read class type: " + b);
}
return attribute;
}
public void objectToEntry(Attribute attribute, TupleOutput tupleOutput) {
if (attribute instanceof AttributeImpl) {
tupleOutput.writeByte(NORMAL_ATTRIBUTE);
nameBinding.objectToEntry(attribute.getAttributeName(), tupleOutput);
typeBinding.objectToEntry(attribute.getType(), tupleOutput);
} else if (attribute instanceof NullaryAttribute) {
tupleOutput.writeByte(NULLARY_ATTRIBUTE);
}
}
}