/*******************************************************************************
* 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.designtime.internal.view.model.jsp;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import org.eclipse.jst.jsf.common.runtime.internal.view.model.common.ITagAttributeHandler;
import org.eclipse.jst.jsf.core.internal.JSFCorePlugin;
import org.eclipse.jst.jsf.designtime.internal.view.model.jsp.IAttributeAdvisor.UnknownAttributeException;
import org.eclipse.jst.jsp.core.internal.contentmodel.tld.provisional.TLDElementDeclaration;
import org.eclipse.wst.xml.core.internal.contentmodel.CMAttributeDeclaration;
/**
* Adapts TLDDocument attributes to a simple map of ITagAttributeHandler. Map is
* unmodifiable.
*
* @author cbateman
*
*/
public class CMNodeNamedMapAdapter implements
Map<String, ITagAttributeHandler>
{
/**
* serializable id
*/
private static final long serialVersionUID = -4188412823197830484L;
private transient final TLDElementDeclaration _tldElement;
private transient final IAttributeAdvisor _advisor;
private transient final AtomicBoolean _isInitialized = new AtomicBoolean(false);
private final Map<String, ITagAttributeHandler> _cache;
/**
* @param tldDoc
* @param advisor
*/
public CMNodeNamedMapAdapter(final TLDElementDeclaration tldDoc,
final IAttributeAdvisor advisor)
{
_tldElement = tldDoc;
_advisor = advisor;
_cache = new HashMap<String, ITagAttributeHandler>();
}
public boolean containsKey(Object key)
{
ensureAllAttributes();
return _cache.containsKey(key);
}
public boolean containsValue(Object value)
{
ensureAllAttributes();
return _cache.containsValue(value);
}
public Set<java.util.Map.Entry<String, ITagAttributeHandler>> entrySet()
{
ensureAllAttributes();
return _cache.entrySet();
}
public ITagAttributeHandler get(Object key)
{
if (key instanceof String)
{
return getOrCreateAttribute((String) key);
}
return null;
}
public boolean isEmpty()
{
return size() == 0;
}
public Set<String> keySet()
{
ensureAllAttributes();
return Collections.unmodifiableSet(_cache.keySet());
}
public int size()
{
if (_tldElement != null)
{
return _tldElement.getAttributes().getLength();
}
return _cache.size();
}
public Collection<ITagAttributeHandler> values()
{
ensureAllAttributes();
return Collections.unmodifiableCollection(_cache.values());
}
private synchronized ITagAttributeHandler getOrCreateAttribute(final String name)
{
ITagAttributeHandler tagAttr = _cache.get(name);
if (tagAttr == null)
{
try
{
tagAttr = _advisor.createAttributeHandler(name);
_cache.put(name, tagAttr);
}
catch (UnknownAttributeException e)
{
JSFCorePlugin.log(e, "Trying to get attribute for "+name); //$NON-NLS-1$
}
}
return tagAttr;
}
private void ensureAllAttributes()
{
if (_isInitialized.compareAndSet(false, true))
{
for (final Iterator it = _tldElement.getAttributes().iterator(); it.hasNext();)
{
final CMAttributeDeclaration attrDecl = (CMAttributeDeclaration) it.next();
getOrCreateAttribute(attrDecl.getAttrName());
}
}
}
public void clear()
{
throw new UnsupportedOperationException("Cannot modify map"); //$NON-NLS-1$
}
public ITagAttributeHandler put(String key, ITagAttributeHandler value)
{
throw new UnsupportedOperationException("Cannot modify map"); //$NON-NLS-1$
}
public void putAll(Map<? extends String, ? extends ITagAttributeHandler> t)
{
throw new UnsupportedOperationException("Cannot modify map"); //$NON-NLS-1$
}
public ITagAttributeHandler remove(Object key)
{
throw new UnsupportedOperationException("Cannot modify map"); //$NON-NLS-1$
}
}