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/*******************************************************************************
* Copyright (c) 2006, 2011 Wind River Systems, 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:
* Markus Schorn - initial API and implementation
*******************************************************************************/
package org.eclipse.search2.internal.ui.text2;
import java.util.ArrayList;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.util.SafeRunnable;
import org.eclipse.search.internal.ui.SearchPlugin;
import org.eclipse.search.internal.ui.SearchPreferencePage;
import org.eclipse.search.ui.text.TextSearchQueryProvider;
import org.eclipse.search2.internal.ui.SearchMessages;
public class TextSearchQueryProviderRegistry {
private static final String EXTENSION_POINT_ID= "org.eclipse.search.textSearchQueryProvider"; //$NON-NLS-1$
private static final String PROVIDER_NODE_NAME= "textSearchQueryProvider"; //$NON-NLS-1$
private static final String ATTRIB_ID= "id"; //$NON-NLS-1$
private static final String ATTRIB_LABEL= "label"; //$NON-NLS-1$
private static final String ATTRIB_CLASS= "class"; //$NON-NLS-1$
private TextSearchQueryProvider fPreferredProvider;
private String fPreferredProviderId;
public TextSearchQueryProviderRegistry() {
fPreferredProviderId= null; // only null when not initialized
fPreferredProvider= null;
}
public TextSearchQueryProvider getPreferred() {
String preferredId= getPreferredEngineID();
if (!preferredId.equals(fPreferredProviderId)) {
updateProvider(preferredId);
}
return fPreferredProvider;
}
private void updateProvider(String preferredId) {
fPreferredProviderId= preferredId;
fPreferredProvider= null;
if (preferredId.length() != 0) { // empty string: default engine
fPreferredProvider= createFromExtension(preferredId);
}
if (fPreferredProvider == null) {
fPreferredProvider= new DefaultTextSearchQueryProvider();
}
}
private String getPreferredEngineID() {
IPreferenceStore prefs= SearchPlugin.getDefault().getPreferenceStore();
String preferedEngine= prefs.getString(SearchPreferencePage.TEXT_SEARCH_QUERY_PROVIDER);
return preferedEngine;
}
private TextSearchQueryProvider createFromExtension(final String id) {
final TextSearchQueryProvider[] res= new TextSearchQueryProvider[] { null };
SafeRunnable safe= new SafeRunnable() {
@Override
public void run() throws Exception {
IConfigurationElement[] extensions= Platform.getExtensionRegistry().getConfigurationElementsFor(EXTENSION_POINT_ID);
for (int i= 0; i < extensions.length; i++) {
IConfigurationElement curr= extensions[i];
if (PROVIDER_NODE_NAME.equals(curr.getName()) && id.equals(curr.getAttribute(ATTRIB_ID))) {
res[0]= (TextSearchQueryProvider) curr.createExecutableExtension(ATTRIB_CLASS);
return;
}
}
}
@Override
public void handleException(Throwable e) {
SearchPlugin.log(e);
}
};
SafeRunnable.run(safe);
return res[0];
}
public String[][] getAvailableProviders() {
ArrayList res= new ArrayList();
res.add(new String[] { SearchMessages.TextSearchQueryProviderRegistry_defaultProviderLabel, "" }); //$NON-NLS-1$
IConfigurationElement[] extensions= Platform.getExtensionRegistry().getConfigurationElementsFor(EXTENSION_POINT_ID);
for (int i= 0; i < extensions.length; i++) {
IConfigurationElement engine= extensions[i];
if (PROVIDER_NODE_NAME.equals(engine.getName())) {
res.add(new String[] { engine.getAttribute(ATTRIB_LABEL), engine.getAttribute(ATTRIB_ID) });
}
}
return (String[][]) res.toArray(new String[res.size()][]);
}
}
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