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/*
* Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
* Simon McDuff - bug 226778
*
*/
package org.eclipse.emf.cdo.internal.common.id;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.id.CDOIDObject;
import org.eclipse.emf.cdo.common.id.CDOIDTemp;
import org.eclipse.emf.cdo.spi.common.id.AbstractCDOID;
import org.eclipse.net4j.util.io.ExtendedDataInput;
import org.eclipse.net4j.util.io.ExtendedDataOutput;
import java.io.IOException;
/**
* @author Eike Stepper
*/
public final class CDOIDNullImpl extends AbstractCDOID implements CDOIDTemp, CDOIDObject
{
public static final CDOIDNullImpl INSTANCE = new CDOIDNullImpl();
private static final long serialVersionUID = 1L;
private CDOIDNullImpl()
{
}
public Type getType()
{
return Type.NULL;
}
public boolean isDangling()
{
return false;
}
public boolean isExternal()
{
return false;
}
public boolean isNull()
{
return true;
}
public boolean isObject()
{
return false;
}
public boolean isTemporary()
{
return false;
}
public int getIntValue()
{
return 0;
}
public long getLongValue()
{
return 0L;
}
public String toURIFragment()
{
return "NULL"; //$NON-NLS-1$
}
@Override
public void read(String fragmentPart)
{
// Do nothing
}
@Override
public void read(ExtendedDataInput in) throws IOException
{
// Do nothing
}
@Override
public void write(ExtendedDataOutput out) throws IOException
{
// Do nothing
}
@Override
public boolean equals(Object obj)
{
return obj == INSTANCE;
}
@Override
public int hashCode()
{
return 0;
}
@Override
public String toString()
{
return "NULL"; //$NON-NLS-1$
}
@Override
protected int doCompareTo(CDOID o) throws ClassCastException
{
((CDOIDNullImpl)o).getIntValue(); // Possibly throw ClassCastException
return 0; // NULL == NULL
}
}
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