content: /**
   *  Copyright (c) 2015-2016 Angelo ZERR.
   *  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:
   *  Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
   */
  package ts.eclipse.ide.internal.ui.navigator;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.eclipse.core.resources.IFile;
  import org.eclipse.core.resources.IProject;
  import org.eclipse.core.resources.IResource;
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.ListenerList;
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.jface.viewers.IDecoration;
  import org.eclipse.jface.viewers.ILabelProviderListener;
  import org.eclipse.jface.viewers.ILightweightLabelDecorator;
  import org.eclipse.jface.viewers.LabelProviderChangedEvent;
  
  import ts.eclipse.ide.core.TypeScriptCorePlugin;
  import ts.eclipse.ide.core.resources.IIDETypeScriptProject;
  import ts.eclipse.ide.core.resources.ITypeScriptElementChangedListener;
  import ts.eclipse.ide.core.resources.TypeScriptElementChangedListenerAdapater;
  import ts.eclipse.ide.core.resources.buildpath.ITsconfigBuildPath;
  import ts.eclipse.ide.core.resources.buildpath.ITypeScriptBuildPath;
  import ts.eclipse.ide.core.utils.TypeScriptResourceUtil;
  import ts.eclipse.ide.ui.TypeScriptUIImageResource;
  
  /**
   * Display an overlay icon on the right top for {@link ITsconfigBuildPath}
   *
   */
  public class BuildpathIndicatorLabelDecorator implements ILightweightLabelDecorator {
  
  	private class DecoratorElementChangeListener extends TypeScriptElementChangedListenerAdapater {
  
  		@Override
  		public void buildPathChanged(IIDETypeScriptProject tsProject, ITypeScriptBuildPath newBuildPath,
  				ITypeScriptBuildPath oldBuildPath) {
  			List<IResource> changed = new ArrayList<IResource>();
  			addResource(newBuildPath, changed);
  			addResource(oldBuildPath, changed);
  			fireChange(changed.toArray(new IResource[changed.size()]));
  		}
  
  		private void addResource(ITypeScriptBuildPath buildPath, List<IResource> resources) {
  			if (buildPath == null) {
  				return;
  			}
  			ITsconfigBuildPath[] containers = buildPath.getTsconfigBuildPaths();
  			for (int i = 0; i < containers.length; i++) {
  				resources.add(containers[i].getTsconfigFile());
  			}
  		}
  
  	}
  
  	private ListenerList fListeners;
  	private ITypeScriptElementChangedListener fChangeListener;
  
  	@Override
  	public void addListener(ILabelProviderListener listener) {
  		if (fChangeListener == null) {
  			fChangeListener = new DecoratorElementChangeListener();
  			TypeScriptCorePlugin.getDefault().addTypeScriptElementChangedListener(fChangeListener);
  		}
  
  		if (fListeners == null) {
  			fListeners = new ListenerList();
  		}
  
  		fListeners.add(listener);
  	}
  
  	@Override
  	public void dispose() {
  
  		if (fChangeListener != null) {
  			TypeScriptCorePlugin.getDefault().removeTypeScriptElementChangedListener(fChangeListener);
  			fChangeListener = null;
  		}
  
  		if (fListeners != null) {
  			Object[] listeners = fListeners.getListeners();
  			for (int i = 0; i < listeners.length; i++) {
  				fListeners.remove(listeners[i]);
  			}
  			fListeners = null;
  		}
  	}
  
  	@Override
  	public boolean isLabelProperty(Object element, String property) {
  		return false;
  	}
  
  	@Override
  	public void removeListener(ILabelProviderListener listener) {
  		if (fListeners == null)
  			return;
  
  		fListeners.remove(listener);
  
  		if (fListeners.isEmpty() && fChangeListener != null) {
  			TypeScriptCorePlugin.getDefault().removeTypeScriptElementChangedListener(fChangeListener);
  			fChangeListener = null;
  		}
  	}
  
  	private void fireChange(IResource[] elements) {
  		if (fListeners != null && !fListeners.isEmpty()) {
  			LabelProviderChangedEvent event = new LabelProviderChangedEvent(this, elements);
  			Object[] listeners = fListeners.getListeners();
  			for (int i = 0; i < listeners.length; i++) {
  				((ILabelProviderListener) listeners[i]).labelProviderChanged(event);
  			}
  		}
  	}
  
  	@Override
  	public void decorate(Object element, IDecoration decoration) {
  		ImageDescriptor overlay = getOverlay(element);
  		if (overlay != null) {
  			decoration.addOverlay(overlay, IDecoration.TOP_RIGHT);
  		}
  	}
  
  	private ImageDescriptor getOverlay(Object element) {
  		if (element instanceof IFile) {
  			IFile resource = (IFile) element;
  			IProject project = resource.getProject();
  			if (project != null && TypeScriptResourceUtil.isTypeScriptProject(project)) {
  				try {
  					IIDETypeScriptProject tsProject = TypeScriptResourceUtil.getTypeScriptProject(project);
  					if (tsProject.getTypeScriptBuildPath().isInBuildPath(resource)) {
  						return TypeScriptUIImageResource.getImageDescriptor(TypeScriptUIImageResource.DESC_OVR_LIBRARY);
  					}
  				} catch (CoreException e) {
  					e.printStackTrace();
  				}
  			}
  		}
  		return null;
  	}
  
  }
  