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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:
* Caspar De Groot - initial API and implementation
*/
package org.eclipse.emf.cdo.internal.common.lock;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.lock.CDOLockOwner;
import org.eclipse.emf.cdo.common.revision.CDOIDAndBranch;
import org.eclipse.emf.cdo.spi.common.lock.InternalCDOLockState;
import org.eclipse.net4j.util.CheckUtil;
import org.eclipse.net4j.util.concurrent.IRWLockManager.LockType;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
/**
* @author Caspar De Groot
*/
public class CDOLockStateImpl implements InternalCDOLockState
{
private final Object lockedObject;
private final Set<CDOLockOwner> readLockOwners = new HashSet<CDOLockOwner>();
private CDOLockOwner writeLockOwner;
private CDOLockOwner writeOptionOwner;
public CDOLockStateImpl(Object lockedObject)
{
CheckUtil.checkArg(lockedObject, "lockedObject");
CheckUtil.checkState(lockedObject instanceof CDOID || lockedObject instanceof CDOIDAndBranch,
"lockedObject is of wrong type");
this.lockedObject = lockedObject;
}
public CDOLockStateImpl copy()
{
CDOLockStateImpl newLockState = new CDOLockStateImpl(lockedObject);
for (CDOLockOwner owner : readLockOwners)
{
newLockState.readLockOwners.add(owner);
}
newLockState.writeLockOwner = writeLockOwner;
newLockState.writeOptionOwner = writeOptionOwner;
return newLockState;
}
public boolean isLocked(LockType lockType, CDOLockOwner lockOwner, boolean others)
{
switch (lockType)
{
case READ:
return isReadLocked(lockOwner, others);
case WRITE:
return isWriteLocked(lockOwner, others);
case OPTION:
return isOptionLocked(lockOwner, others);
}
return false;
}
private boolean isReadLocked(CDOLockOwner by, boolean others)
{
int n = readLockOwners.size();
if (n == 0)
{
return false;
}
if (!others)
{
return readLockOwners.contains(by);
}
return true;
}
private boolean isWriteLocked(CDOLockOwner by, boolean others)
{
if (writeLockOwner == null)
{
return false;
}
return writeLockOwner.equals(by) ^ others;
}
private boolean isOptionLocked(CDOLockOwner by, boolean others)
{
if (writeOptionOwner == null)
{
return false;
}
return writeOptionOwner.equals(by) ^ others;
}
public Set<CDOLockOwner> getReadLockOwners()
{
return Collections.unmodifiableSet(readLockOwners);
}
public void addReadLockOwner(CDOLockOwner lockOwner)
{
readLockOwners.add(lockOwner);
}
public boolean removeReadLockOwner(CDOLockOwner lockOwner)
{
return readLockOwners.remove(lockOwner);
}
public CDOLockOwner getWriteLockOwner()
{
return writeLockOwner;
}
public void setWriteLockOwner(CDOLockOwner lockOwner)
{
writeLockOwner = lockOwner;
}
public CDOLockOwner getWriteOptionOwner()
{
return writeOptionOwner;
}
public void setWriteOptionOwner(CDOLockOwner lockOwner)
{
writeOptionOwner = lockOwner;
}
public Object getLockedObject()
{
return lockedObject;
}
@Override
public String toString()
{
StringBuilder builder = new StringBuilder("CDOLockState\nlockedObject=");
builder.append(lockedObject);
builder.append("\nreadLockOwners=");
if (readLockOwners.size() > 0)
{
boolean first = true;
for (CDOLockOwner lockOwner : readLockOwners)
{
if (first)
{
first = false;
}
else
{
builder.append(", ");
}
builder.append(lockOwner);
}
builder.deleteCharAt(builder.length() - 1);
}
else
{
builder.append("NONE");
}
builder.append("\nwriteLockOwner=");
builder.append(writeLockOwner != null ? writeLockOwner : "NONE");
builder.append("\nwriteOptionOwner=");
builder.append(writeOptionOwner != null ? writeOptionOwner : "NONE");
return builder.toString();
}
}
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