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/*******************************************************************************
* Copyright (c) 2001, 2004 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
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*******************************************************************************/
package org.eclipse.wst.sse.core.internal.modelhandler;
import java.util.HashSet;
import java.util.Iterator;
import org.eclipse.wst.sse.core.internal.ltk.modelhandler.EmbeddedTypeHandler;
import org.eclipse.wst.sse.core.internal.ltk.modelhandler.IDocumentTypeHandler;
/**
*
*/
public class EmbeddedTypeRegistryImpl implements EmbeddedTypeRegistry {
private static EmbeddedTypeRegistry instance = null;
public synchronized static EmbeddedTypeRegistry getInstance() {
if (instance == null) {
instance = new EmbeddedTypeRegistryImpl();
}
return instance;
}
private HashSet hashSet = null;
private EmbeddedTypeHandler registryDefaultHandler = null;
/*
* @see ContentTypeRegistry#getTypeFor(String)
*/
/**
* Constructor for ContentTypeRegistryImpl.
*/
private EmbeddedTypeRegistryImpl() {
super();
hashSet = new HashSet();
new EmbeddedTypeRegistryReader().readRegistry(hashSet);
}
/**
* @see ContentTypeRegistry#add(ContentTypeDescription)
*/
void add(IDocumentTypeHandler contentTypeDescription) {
hashSet.add(contentTypeDescription);
}
private EmbeddedTypeHandler getJSPDefaultEmbeddedType() {
return getTypeFor("text/html"); //$NON-NLS-1$
}
/**
* Method getRegistryDefault. We cache the default handler, since can't
* change once plugin descriptors are loaded.
*
* @return EmbeddedTypeHandler
*/
private EmbeddedTypeHandler getRegistryDefault() {
if (registryDefaultHandler == null) {
Iterator it = hashSet.iterator();
while ((registryDefaultHandler == null) && (it.hasNext())) { // safe
// cast
// since
// 'add'
// requires
// EmbeddedContentTypeDescription
EmbeddedTypeHandler item = (EmbeddedTypeHandler) it.next();
if ((item != null) && (item.isDefault())) {
registryDefaultHandler = item;
break;
}
}
}
return registryDefaultHandler;
}
/**
* Finds the contentTypeDescription based on literal id. Its basically a
* "first found first returned". Note the order is fairly unpredictable,
* so non-unique ids would cause problems.
*/
public EmbeddedTypeHandler getTypeFor(String mimeType) {
// Note: the reason we have this precondition is that the
// default is different inside the registry than when called,
// for example, from the JSPLoader. For the JSPLoader, if there
// is no mimetype, the default should be HTML. Here, if there is
// some mimetype, but it is not recognized, we return a default
// for XML. This is required for various voice xml types, etc.
EmbeddedTypeHandler found = null;
if (mimeType == null || mimeType.trim().length() == 0) {
found = getJSPDefaultEmbeddedType();
} else {
Iterator it = hashSet.iterator();
while ((found == null) && (it.hasNext())) { // safe cast since
// 'add' requires
// EmbeddedContentTypeDescription
EmbeddedTypeHandler item = (EmbeddedTypeHandler) it.next();
if ((item != null) && (item.getSupportedMimeTypes().contains(mimeType))) {
found = item;
break;
}
}
}
if (found == null) {
found = getRegistryDefault();
}
return found;
}
}
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