content: /*******************************************************************************
   * Copyright (c) 2000, 2008 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
   *******************************************************************************/
  
  package org.eclipse.wst.jsdt.internal.ui.search;
  
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.IConfigurationElement;
  import org.eclipse.core.runtime.IStatus;
  import org.eclipse.core.runtime.Status;
  import org.eclipse.wst.jsdt.internal.corext.util.Messages;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.ui.search.IQueryParticipant;
  
  /**
   */
  public class SearchParticipantDescriptor {
  		private static final String CLASS= "class"; //$NON-NLS-1$
  		private static final String NATURE= "nature"; //$NON-NLS-1$
  		private static final String ID= "id"; //$NON-NLS-1$
  		
  		private IConfigurationElement fConfigurationElement;
  		private boolean fEnabled; //	
  		
  		protected SearchParticipantDescriptor(IConfigurationElement configElement) {
  			fConfigurationElement= configElement;
  			fEnabled= true;
  		}
  
  	/**
  	 * checks whether a participant has all the proper attributes.
  	 * 
  	 * @return returns a status describing the result of the validation
  	 */
  	protected IStatus checkSyntax() {
  		if (fConfigurationElement.getAttribute(ID) == null) {
  			String format= SearchMessages.SearchParticipant_error_noID; 
  			String message= Messages.format(format,  new String[] { fConfigurationElement.getDeclaringExtension().getUniqueIdentifier() });
  			return new Status(IStatus.ERROR, JavaScriptPlugin.getPluginId(), 0, message, null);
  		}
  		if (fConfigurationElement.getAttribute(NATURE) == null) {
  			String format= SearchMessages.SearchParticipant_error_noNature; 
  			String message= Messages.format(format,  new String[] { fConfigurationElement.getAttribute(ID)});
  			return new Status(IStatus.ERROR, JavaScriptPlugin.getPluginId(), 0, message, null);
  		}
  
  		if (fConfigurationElement.getAttribute(CLASS) == null) {
  			String format= SearchMessages.SearchParticipant_error_noClass; 
  			String message= Messages.format(format,  new String[] { fConfigurationElement.getAttribute(ID)});
  			return new Status(IStatus.ERROR, JavaScriptPlugin.getPluginId(), 0, message, null);
  		}
  		return Status.OK_STATUS;
  	}
  
  	public String getID() {
  		return fConfigurationElement.getAttribute(ID);
  	}
  	
  	public void disable() {
  		fEnabled= false;
  	}
  	
  	public boolean isEnabled() {
  		return fEnabled;
  	}
  	
  	protected IQueryParticipant create() throws CoreException {
  		try {
  			return (IQueryParticipant) fConfigurationElement.createExecutableExtension(CLASS);
  		} catch (ClassCastException e) {
  			throw new CoreException(new Status(IStatus.ERROR, JavaScriptPlugin.getPluginId(), 0, SearchMessages.SearchParticipant_error_classCast, e)); 
  		}
  	}
  
  	protected String getNature() {
  		return fConfigurationElement.getAttribute(NATURE);
  	}
  
  
  }
  