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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.ui.internal.views;
import org.eclipse.core.runtime.*;
import org.eclipse.help.internal.search.*;
import org.eclipse.help.internal.search.federated.*;
import org.eclipse.help.ui.*;
import org.eclipse.help.ui.internal.*;
import org.eclipse.jface.preference.*;
import org.eclipse.jface.resource.*;
import org.eclipse.swt.graphics.*;
/**
* Descriptor for a federated search engine participant.
*/
public class EngineDescriptor {
private IConfigurationElement config;
private Image image;
private ISearchEngine engine;
private ISearchScopeFactory factory;
/**
*
*/
public EngineDescriptor(IConfigurationElement config) {
this.config = config;
}
public IConfigurationElement getConfig() {
return config;
}
public IConfigurationElement [] getPages() {
return config.getChildren("subpage");
}
public String getLabel() {
return config.getAttribute(IHelpUIConstants.ATT_LABEL);
}
public String getId() {
return config.getAttribute(IHelpUIConstants.ATT_ID);
}
public boolean isEnabled() {
String enabled = config.getAttribute(IHelpUIConstants.ATT_ENABLED);
if (enabled!=null)
return enabled.equals("true");
return false;
}
public Image getIconImage() {
if (image!=null)
return image;
String icon = config.getAttribute(IHelpUIConstants.ATT_ICON);
if (icon!=null)
image = HelpUIResources.getImage(icon);
else
image = HelpUIResources.getImage(IHelpUIConstants.IMAGE_HELP_SEARCH);
return image;
}
public String getDescription() {
String desc = null;
IConfigurationElement [] children = config.getChildren(IHelpUIConstants.EL_DESC);
if (children.length==1)
desc = children[0].getValue();
return desc;
}
public ImageDescriptor getImageDescriptor() {
ImageDescriptor desc=null;
String icon = config.getAttribute(IHelpUIConstants.ATT_ICON);
if (icon!=null)
desc = HelpUIResources.getImageDescriptor(icon);
else
desc = HelpUIResources.getImageDescriptor(IHelpUIConstants.IMAGE_HELP_SEARCH);
return desc;
}
public RootScopePage createRootPage(String scopeSetName) {
try {
Object obj = config.createExecutableExtension(IHelpUIConstants.ATT_PAGE_CLASS);
if (obj instanceof RootScopePage) {
RootScopePage page = (RootScopePage)obj;
page.init(getId(), scopeSetName);
return page;
}
else
return null;
}
catch (CoreException e) {
return null;
}
}
public ISearchEngine getEngine() {
if (engine==null) {
String eclass = config.getAttribute(IHelpUIConstants.ATT_CLASS);
if (eclass!=null) {
try {
Object obj = config.createExecutableExtension(IHelpUIConstants.ATT_CLASS);
if (obj instanceof ISearchEngine) {
engine = (ISearchEngine)obj;
}
}
catch (CoreException e) {
HelpUIPlugin.logWarning("Engine " + eclass + " cannot be instantiated");
}
}
}
return engine;
}
public ISearchScope createSearchScope(IPreferenceStore store) {
if (factory==null) {
String fclass = config.getAttribute(IHelpUIConstants.ATT_SCOPE_FACTORY);
if (fclass!=null) {
try {
Object obj = config.createExecutableExtension(IHelpUIConstants.ATT_SCOPE_FACTORY);
if (obj instanceof ISearchScopeFactory) {
factory = (ISearchScopeFactory)obj;
}
}
catch (CoreException e) {
HelpUIPlugin.logWarning("Scope factory " + fclass + " cannot be instantiated");
}
}
}
if (factory!=null)
return factory.createSearchScope(store);
else
return null;
}
}
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