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/*******************************************************************************
* Copyright (c) 2004, 2006 IBM Corporation 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:
* IBM Corporation - Initial API and implementation
*******************************************************************************/
package org.eclipse.wst.common.core.search.internal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.expressions.EvaluationContext;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.wst.common.core.search.SearchParticipant;
import org.eclipse.wst.common.core.search.pattern.SearchPattern;
public class SearchParticipantRegistry
{
protected Map idMap = new HashMap(); // maps searchParticipant id to a
// searchParticipant descriptor
public SearchParticipantRegistry()
{
}
public void putSearchParticipant(String id,
SearchParticipantDescriptor searchParticipantDescriptor)
{
idMap.put(id, searchParticipantDescriptor);
}
public String[] getSearchParticipantIds()
{
Set ids = idMap.keySet();
return (String[]) ids.toArray(new String[ids.size()]);
}
public Collection getSearchParticipants()
{
return idMap.values();
}
public SearchParticipant getSearchParticipant(String id)
{
SearchParticipantDescriptor searchParticipantDescriptor = null;
if (id != null)
{
searchParticipantDescriptor = (SearchParticipantDescriptor) idMap
.get(id);
}
return searchParticipantDescriptor != null ? searchParticipantDescriptor
.getSearchParticipant()
: null;
}
public SearchParticipant[] getParticipants(SearchPattern pattern, Map searchOptions)
{
EvaluationContext evalContext = createEvaluationContext(pattern);
List result = new ArrayList();
for (Iterator iter = getSearchParticipants().iterator(); iter.hasNext();)
{
SearchParticipantDescriptor descriptor = (SearchParticipantDescriptor) iter
.next();
try
{
if (descriptor.matches(evalContext))
{
try
{
SearchParticipant participant = descriptor
.getSearchParticipant();
if (!SearchParticipant.class.isInstance(participant))
throw new ClassCastException();
if (participant.isApplicable(pattern, searchOptions))
{
result.add(participant);
}
} catch (ClassCastException e)
{
iter.remove();
}
}
} catch (CoreException e)
{
iter.remove();
}
}
return (SearchParticipant[]) result
.toArray(new SearchParticipant[result.size()]);
}
private static EvaluationContext createEvaluationContext(
SearchPattern pattern)
{
EvaluationContext result = new EvaluationContext(null, pattern);
result.addVariable("pattern", pattern); //$NON-NLS-1$
return result;
}
}
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