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/*******************************************************************************
* Copyright (c) 2010, 2019 IBM Corporation and others.
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsf.common.internal.locator;
import java.util.Iterator;
import org.eclipse.jst.jsf.common.internal.policy.IIteratorPolicy;
import org.eclipse.jst.jsf.common.internal.strategy.IteratorPolicyBasedStrategyComposite;
/**
* @author cbateman
*
* @param <LOCATORTYPE>
* @param <COMPOSITETYPE>
* @param <CONTEXTTYPE>
* @param <IDTYPE>
*/
public abstract class CompositeLocator<LOCATORTYPE, COMPOSITETYPE, CONTEXTTYPE, IDTYPE> extends
IteratorPolicyBasedStrategyComposite<CONTEXTTYPE, LOCATORTYPE, COMPOSITETYPE, IDTYPE, ILocator<LOCATORTYPE, CONTEXTTYPE, IDTYPE>>
implements ILocator<COMPOSITETYPE, CONTEXTTYPE, IDTYPE>, ILocatorChangeListener
{
private DefaultComposingLocatorDelegate<LOCATORTYPE, COMPOSITETYPE, CONTEXTTYPE, IDTYPE> _delegate;
private final COMPOSITETYPE _noResultValue;
/**
* @param id
* @param displayName
* @param policy
* @param noResultValue
* @param compositionStrategy
*/
public CompositeLocator(
final IDTYPE id,
final String displayName,
final IIteratorPolicy<IDTYPE> policy,
final COMPOSITETYPE noResultValue,
final DefaultCompositionStrategy<CONTEXTTYPE, LOCATORTYPE, COMPOSITETYPE, ILocator<LOCATORTYPE, CONTEXTTYPE, IDTYPE>> compositionStrategy)
{
super(policy, compositionStrategy);
_delegate = new DefaultComposingLocatorDelegate<LOCATORTYPE, COMPOSITETYPE, CONTEXTTYPE, IDTYPE>(id, displayName)
{
@Override
protected COMPOSITETYPE doLocate(final CONTEXTTYPE context)
{
return CompositeLocator.this.doLocate(context);
}
};
_noResultValue = noResultValue;
}
/**
* @param context
* @return the located value.
*/
protected abstract COMPOSITETYPE doLocate(CONTEXTTYPE context);
public final IDTYPE getId()
{
return _delegate.getId();
}
public String getDisplayName()
{
return _delegate.getDisplayName();
}
public void start(final CONTEXTTYPE initialContext)
{
if (canStart())
{
final Iterator<ILocator<LOCATORTYPE, CONTEXTTYPE, IDTYPE>> iterator = getIterator();
while (iterator.hasNext())
{
final ILocator<LOCATORTYPE, CONTEXTTYPE, IDTYPE> next = iterator.next();
next.addListener(this);
next.start(initialContext);
}
_delegate.start(initialContext);
}
throw new IllegalStateException("canStart must be called before calling start"); //$NON-NLS-1$
}
public boolean canStart()
{
boolean canStart = true;
final Iterator<ILocator<LOCATORTYPE, CONTEXTTYPE, IDTYPE>> iterator = getIterator();
while (canStart && iterator.hasNext())
{
canStart &= iterator.next().canStart();
}
return canStart && _delegate.canStart();
}
public boolean isStarted()
{
return _delegate.isStarted();
}
public void stop()
{
if (!isStarted())
{
final Iterator<ILocator<LOCATORTYPE, CONTEXTTYPE, IDTYPE>> iterator = getIterator();
while (iterator.hasNext())
{
final ILocator<LOCATORTYPE, CONTEXTTYPE, IDTYPE> next = iterator.next();
next.removeListener(this);
next.stop();
}
_delegate.stop();
}
}
public COMPOSITETYPE locate(final CONTEXTTYPE context)
{
return _delegate.locate(context);
}
@Override
public COMPOSITETYPE getNoResult()
{
return _noResultValue;
}
public void changed(final LocatorChangeEvent event)
{
_delegate.fireChangeEvent(event);
}
public void addListener(final ILocatorChangeListener listener)
{
_delegate.addListener(listener);
}
public void removeListener(final ILocatorChangeListener listener)
{
_delegate.removeListener(listener);
}
/**
* Re-fire events from composed strategies.
*
* @param event
*/
protected void fireChangeEvent(final LocatorChangeEvent event)
{
_delegate.fireChangeEvent(event);
}
}
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