org.eclipse.jdt.ui/core extension/org/eclipse/jdt/internal/corext/buildpath/UnexcludeOperation.java

/*******************************************************************************
 * 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 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.jdt.internal.corext.buildpath;

import java.lang.reflect.InvocationTargetException;
import java.util.List;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;

import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaModelException;

import org.eclipse.jdt.internal.corext.util.Messages;

import org.eclipse.jdt.internal.ui.wizards.NewWizardMessages;
import org.eclipse.jdt.internal.ui.wizards.buildpaths.newsourcepage.DialogPackageExplorerActionGroup;


/**
 * Operation to unexclude objects of type <code>IResource</code>. This is the 
 * reverse action to exclude.
 * 
 * @see org.eclipse.jdt.internal.corext.buildpath.ClasspathModifier#unExclude(List, IJavaProject, IProgressMonitor)
 * @see org.eclipse.jdt.internal.corext.buildpath.ExcludeOperation
 */
public class UnexcludeOperation extends ClasspathModifierOperation {

	/**
	 * Constructor
	 * 
	 * @param listener a <code>IClasspathModifierListener</code> that is notified about 
	 * changes on classpath entries or <code>null</code> if no such notification is 
	 * necessary.
	 * @param informationProvider a provider to offer information to the operation
	 * 
	 * @see IClasspathInformationProvider
	 * @see ClasspathModifier
	 */
	public UnexcludeOperation(IClasspathModifierListener listener, IClasspathInformationProvider informationProvider) {
		super(listener, informationProvider, NewWizardMessages.NewSourceContainerWorkbookPage_ToolBar_Unexclude_tooltip, IClasspathInformationProvider.UNEXCLUDE); 
	}

	/**
	 * Method which runs the actions with a progress monitor.<br>
	 * 
	 * This operation does not require any queries from the provider.
	 * 
	 * @param monitor a progress monitor, can be <code>null</code>
	 */
	public void run(IProgressMonitor monitor) throws InvocationTargetException {
		List result= null;
        fException= null;
		try {
			List resources= getSelectedElements();
			IJavaProject project= fInformationProvider.getJavaProject();
			result= unExclude(resources, project, monitor);
		} catch (CoreException e) {
			fException= e;
			result= null;
		}
		super.handleResult(result, monitor);
	}

	/**
	 * Find out whether this operation can be executed on 
	 * the provided list of elements.
	 * 
	 * @param elements a list of elements
	 * @param types an array of types for each element, that is, 
	 * the type at position 'i' belongs to the selected element 
	 * at position 'i' 
	 * 
	 * @return <code>true</code> if the operation can be 
	 * executed on the provided list of elements, <code>
	 * false</code> otherwise.
	 * @throws JavaModelException 
	 */
	public boolean isValid(List elements, int[] types) throws JavaModelException {
	    if (elements.size() == 0)
	        return false;
	    IJavaProject project= fInformationProvider.getJavaProject();
	    for(int i= 0; i < elements.size(); i++) {
	        Object element= elements.get(i);
	        switch (types[i]) {
	            case DialogPackageExplorerActionGroup.FOLDER: if (!isValidFolder((IResource)element, project)) return false; break;
	            case DialogPackageExplorerActionGroup.EXCLUDED_FOLDER: if (!isValidExcludedFolder((IResource)element, project)) return false; break;
	            case DialogPackageExplorerActionGroup.EXCLUDED_FILE: if (!isValidExcludedFile((IFile)element, project)) return false; break;
	            default: return false;
	        }
	    }
	    return true;
	}

	/**
	 * Find out whether the folder can be unexcluded or not.
	 * 
	 * @param resource the resource to be checked
	 * @param project the Java project
	 * @return <code>true</code> if the folder can be unexcluded, <code>
	 * false</code> otherwise
	 * @throws JavaModelException
	 */
	private boolean isValidFolder(IResource resource, IJavaProject project) throws JavaModelException {
		return ClasspathModifier.isExcluded(resource, project);
	}

	/**
	 * Find out whether the excluded folder can be unexcluded or not.
	 * 
	 * @param resource the resource to be checked
	 * @param project the Java project
	 * @return <code>true</code> if the folder can be unexcluded, <code>
	 * false</code> otherwise
	 * @throws JavaModelException
	 */
	private boolean isValidExcludedFolder(IResource resource, IJavaProject project) throws JavaModelException {
		return ClasspathModifier.isExcluded(resource, project);
	}

	/**
	 * Find out whether the file can be excluded or not.
	 * 
	 * @param file the file to be checked
	 * @param project the Java project
	 * @return <code>true</code> if the file can be unexcluded, <code>
	 * false</code> otherwise
	 * @throws JavaModelException
	 */
	private boolean isValidExcludedFile(IFile file, IJavaProject project) throws JavaModelException {
		return ClasspathModifier.isExcluded(file, project);
	}

	/**
	 * Get a description for this operation. The description depends on 
	 * the provided type parameter, which must be a constant of 
	 * <code>DialogPackageExplorerActionGroup</code>. If the type is 
	 * <code>DialogPackageExplorerActionGroup.MULTI</code>, then the 
	 * description will be very general to describe the situation of 
	 * all the different selected objects as good as possible.
	 * 
	 * @param type the type of the selected object, must be a constant of 
	 * <code>DialogPackageExplorerActionGroup</code>.
	 * @return a string describing the operation
	 */
	public String getDescription(int type) {
		IResource resource= (IResource) getSelectedElements().get(0);
        String name= escapeSpecialChars(resource.getName());
		
		if (type == DialogPackageExplorerActionGroup.FOLDER)
			return Messages.format(NewWizardMessages.PackageExplorerActionGroup_FormText_UnexcludeFolder, name); 
		if (type == DialogPackageExplorerActionGroup.EXCLUDED_FILE)
			return Messages.format(NewWizardMessages.PackageExplorerActionGroup_FormText_UnexcludeFile, name);
		
		return Messages.format(NewWizardMessages.PackageExplorerActionGroup_FormText_Default_Unexclude, name); 
	}
}