eu.geclipse.aws.ec2.ui.actions.AbstractSecurityGroupAction.java Source code

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/*****************************************************************************
 * Copyright (c) 2008 g-Eclipse Consortium 
 * 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
 *
 * Initial development of the original code was made for the
 * g-Eclipse project founded by European Union
 * project number: FP6-IST-034327  http://www.geclipse.eu/
 *
 * Contributors:
 *    Moritz Post - initial API and implementation
 *****************************************************************************/

package eu.geclipse.aws.ec2.ui.actions;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;

import eu.geclipse.aws.ec2.EC2SecurityGroup;

/**
 * A base class for security group related actions in the VO subtree.
 * 
 * @author Moritz Post
 */
public abstract class AbstractSecurityGroupAction implements IObjectActionDelegate {

    /**
     * Flag denoting that the action is enabled when exactly one element is
     * selected
     */
    public static int ENABLE_FOR_ONE = 1;

    /**
     * Flag denoting that the action is enabled when more than zero elements are
     * selected.
     */
    public static int ENABLE_FOR_MANY = 2 | AbstractSecurityGroupAction.ENABLE_FOR_ONE;

    /** The workbench part. */
    private IWorkbenchPart workbenchPart;

    /** The list of selected {@link EC2SecurityGroup}s. */
    private List<EC2SecurityGroup> securityGroupList;

    /**
     * Creates a new action to edit the selected security group.
     */
    public AbstractSecurityGroupAction() {
        this.securityGroupList = new ArrayList<EC2SecurityGroup>();
    }

    public void setActivePart(final IAction action, final IWorkbenchPart targetPart) {
        this.workbenchPart = targetPart;
    }

    public void selectionChanged(final IAction action, final ISelection selection) {
        boolean enable = false;
        this.securityGroupList.clear();

        if (selection instanceof IStructuredSelection) {
            IStructuredSelection structuredSelection = (IStructuredSelection) selection;

            for (Object element : structuredSelection.toList()) {
                if (element instanceof EC2SecurityGroup) {
                    EC2SecurityGroup securityGroup = (EC2SecurityGroup) element;
                    this.securityGroupList.add(securityGroup);
                }
            }
        }
        if ((getEnablementCount() ^ AbstractSecurityGroupAction.ENABLE_FOR_ONE) == 0
                && this.securityGroupList.size() == 1) {
            enable = true;
        } else if ((getEnablementCount() ^ AbstractSecurityGroupAction.ENABLE_FOR_MANY) == 0
                && this.securityGroupList.size() > 0) {
            enable = true;
        }
        action.setEnabled(enable);

    }

    /**
     * Defines the count for which this Action should be enabled. Possible values
     * are:
     * <ul>
     * <li>{@link #ENABLE_FOR_ONE}</li>
     * <li>{@link #ENABLE_FOR_MANY}</li>
     * </ul>
     * 
     * @return the flag denoting if the desired selection count
     */
    abstract protected int getEnablementCount();

    /**
     * Getter for the {@link #workbenchPart}.
     * 
     * @return the workbenchPart
     */
    public IWorkbenchPart getWorkbenchPart() {
        return this.workbenchPart;
    }

    /**
     * Returns the list of currently selected security groups. Getter for the
     * {@link #securityGroupList}
     * 
     * @return the securityGroupList
     */
    public List<EC2SecurityGroup> getSecurityGroupList() {
        return this.securityGroupList;
    }
}