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/*******************************************************************************
* Copyright (c) 2001, 2005 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.HashMap;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.wst.sse.core.internal.ltk.modelhandler.AbstractModelHandler;
import org.eclipse.wst.sse.core.internal.ltk.modelhandler.IModelHandler;
/**
* This class just converts what's in the plugins registry into a form more
* easily useable by others, the ContentTypeRegistry.
*/
class ModelHandlerRegistryReader {
private HashMap allReadyCreateInstances = new HashMap();
protected String ATT_ASSOCIATED_CONTENT_TYPE = "associatedContentTypeId"; //$NON-NLS-1$
protected String ATT_CLASS = "class"; //$NON-NLS-1$
protected String ATT_DEFAULT = "default"; //$NON-NLS-1$
protected String ATT_ID = "id"; //$NON-NLS-1$
IConfigurationElement[] elements;
protected String EXTENSION_POINT_ID = "modelHandler"; //$NON-NLS-1$
//
protected String PLUGIN_ID = "org.eclipse.wst.sse.core"; //$NON-NLS-1$
protected String TAG_NAME = "modelHandler"; //$NON-NLS-1$
//
/**
* ContentTypeRegistryReader constructor comment.
*/
ModelHandlerRegistryReader() {
super();
}
String getAssociatedContentTypeId(IConfigurationElement element) {
String value = element.getAttribute(ATT_ASSOCIATED_CONTENT_TYPE);
return value;
}
String getId(IConfigurationElement element) {
String idValue = element.getAttribute(ATT_ID);
return idValue;
}
synchronized IModelHandler getInstance(IConfigurationElement element) {
// May need to reconsider, but for now, we'll assume all clients must
// subclass AbstractContentTypeIdentifier. Its easier and safer, for
// this
// low level "system" object. (That is, we can check and set "package
// protected"
// attributes.
AbstractModelHandler modelHandler = (AbstractModelHandler) allReadyCreateInstances.get(getId(element));
if (modelHandler == null) {
try {
modelHandler = (AbstractModelHandler) element.createExecutableExtension(ATT_CLASS);
if (modelHandler != null) {
allReadyCreateInstances.put(getId(element), modelHandler);
String defaultValue = element.getAttribute(ATT_DEFAULT);
if (defaultValue != null && "true".equals(defaultValue)) //$NON-NLS-1$
modelHandler.setDefault(true);
else
modelHandler.setDefault(false);
// TODO -- set and check attributes vs. created instance
//contentTypeIdentifier.setOrCheckId(element.getAttribute(ATT_ID));
}
} catch (CoreException e) {
org.eclipse.wst.sse.core.internal.Logger.logException(e);
}
}
return modelHandler;
}
public boolean isElementDefault(IConfigurationElement element) {
String defaultValue = element.getAttribute(ATT_DEFAULT);
if (defaultValue != null && "true".equals(defaultValue)) //$NON-NLS-1$
return true;
else
return false;
}
ModelHandlerRegistryReader readRegistry() {
IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry();
IExtensionPoint point = extensionRegistry.getExtensionPoint(PLUGIN_ID, EXTENSION_POINT_ID);
if (point != null) {
// just remember the elements, so plugins don't have to
// be activated, unless extension matches those "of interest".
elements = point.getConfigurationElements();
}
return this;
}
}
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