/*******************************************************************************
* Copyright (c) 2008 Oracle Corporation.
* 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:
* Cameron Bateman - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsf.facelet.core.internal.cm.strategy;
import org.eclipse.jst.jsf.common.dom.TagIdentifier;
import org.eclipse.jst.jsf.common.internal.strategy.IIdentifiableStrategy;
import org.eclipse.jst.jsf.facelet.core.internal.cm.ExternalTagInfo;
import org.eclipse.jst.jsf.facelet.core.internal.cm.TagInfo;
/**
* A strategy whose algorithm loads the tag CM data for a tag.
*
* @author cbateman
*
*/
public interface IExternalMetadataStrategy extends
IIdentifiableStrategy<TagIdentifier, TagInfo, String>
{
/**
* A null strategy that returns no result for all queries
* @author cbateman
*
*/
static class NullExternalMetadataStrategy implements IExternalMetadataStrategy
{
public TagInfo getNoResult()
{
return ExternalTagInfo.NULL_INSTANCE;
}
public TagInfo perform(TagIdentifier input) throws Exception
{
return getNoResult();
}
public String getDisplayName()
{
return "NULL instance; you shouldn't see this label!"; //$NON-NLS-1$
}
public String getId()
{
return "NULL Strategy"; //$NON-NLS-1$
}
}
}