com.google.dart.tools.ui.callhierarchy.RefreshElementAction.java Source code

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Here is the source code for com.google.dart.tools.ui.callhierarchy.RefreshElementAction.java

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/*
 * Copyright (c) 2012, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.dart.tools.ui.callhierarchy;

import com.google.dart.tools.ui.DartPluginImages;
import com.google.dart.tools.ui.internal.callhierarchy.MethodWrapper;
import com.google.dart.tools.ui.internal.text.DartHelpContextIds;

import org.eclipse.jface.action.Action;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchCommandConstants;
import org.eclipse.ui.PlatformUI;

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

/**
 * Action class to refresh a single element in the call hierarchy.
 */
public class RefreshElementAction extends Action {

    /**
     * The call hierarchy viewer.
     */
    private final CallHierarchyViewer viewer;

    /**
     * Creates the action to refresh a single element in the call hierarchy.
     * 
     * @param viewer the call hierarchy viewer
     */
    public RefreshElementAction(CallHierarchyViewer viewer) {
        this.viewer = viewer;
        setText(CallHierarchyMessages.RefreshSingleElementAction_text);
        setToolTipText(CallHierarchyMessages.RefreshSingleElementAction_tooltip);
        setDescription(CallHierarchyMessages.RefreshSingleElementAction_description);
        DartPluginImages.setLocalImageDescriptors(this, "refresh.gif");//$NON-NLS-1$
        setActionDefinitionId(IWorkbenchCommandConstants.FILE_REFRESH);
        PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
                DartHelpContextIds.CALL_HIERARCHY_REFRESH_SINGLE_ELEMENT_ACTION);
        setEnabled(true);
    }

    @Override
    public void run() {
        IStructuredSelection selection = (IStructuredSelection) getSelection();
        if (selection.isEmpty()) {
            viewer.getPart().refresh();
            return;
        }
        List<MethodWrapper> toExpand = new ArrayList<MethodWrapper>();
        for (Iterator<?> iter = selection.iterator(); iter.hasNext();) {
            MethodWrapper element = (MethodWrapper) iter.next();
            boolean isExpanded = viewer.getExpandedState(element);
            element.removeFromCache();
            if (isExpanded) {
                viewer.setExpandedState(element, false);
                toExpand.add(element);
            }
            viewer.refresh(element);
        }
        for (Iterator<MethodWrapper> iter = toExpand.iterator(); iter.hasNext();) {
            MethodWrapper elem = iter.next();
            viewer.setExpandedState(elem, true);
        }
    }

    /**
     * Gets the selection from the call hierarchy view part.
     * 
     * @return the current selection
     */
    private ISelection getSelection() {
        return viewer.getSelection();
    }
}