com.google.dart.tools.ui.internal.viewsupport.StatusBarUpdater.java Source code

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Here is the source code for com.google.dart.tools.ui.internal.viewsupport.StatusBarUpdater.java

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/*
 * Copyright (c) 2011, 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.internal.viewsupport;

import com.google.dart.tools.core.model.DartElement;
import com.google.dart.tools.ui.DartElementLabels;
import com.google.dart.tools.ui.DartUIMessages;
import com.google.dart.tools.ui.Messages;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.action.IStatusLineManager;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.ui.model.IWorkbenchAdapter;

/**
 * Add the <code>StatusBarUpdater</code> to your ViewPart to have the statusbar describing the
 * selected elements.
 */
public class StatusBarUpdater implements ISelectionChangedListener {

    private final long LABEL_FLAGS = DartElementLabels.DEFAULT_QUALIFIED | DartElementLabels.ROOT_POST_QUALIFIED
            | DartElementLabels.APPEND_ROOT_PATH | DartElementLabels.M_PARAMETER_TYPES
            | DartElementLabels.M_PARAMETER_NAMES | DartElementLabels.M_APP_RETURNTYPE
            | DartElementLabels.M_EXCEPTIONS | DartElementLabels.F_APP_TYPE_SIGNATURE
            | DartElementLabels.T_TYPE_PARAMETERS;

    private IStatusLineManager fStatusLineManager;

    public StatusBarUpdater(IStatusLineManager statusLineManager) {
        fStatusLineManager = statusLineManager;
    }

    /*
     * @see ISelectionChangedListener#selectionChanged
     */
    @Override
    public void selectionChanged(SelectionChangedEvent event) {
        String statusBarMessage = formatMessage(event.getSelection());
        fStatusLineManager.setMessage(statusBarMessage);
    }

    protected String formatMessage(ISelection sel) {
        if (sel instanceof IStructuredSelection && !sel.isEmpty()) {
            IStructuredSelection selection = (IStructuredSelection) sel;

            int nElements = selection.size();
            if (nElements > 1) {
                return Messages.format(DartUIMessages.StatusBarUpdater_num_elements_selected,
                        String.valueOf(nElements));
            } else {
                Object elem = selection.getFirstElement();
                if (elem instanceof DartElement) {
                    return formatJavaElementMessage((DartElement) elem);
                } else if (elem instanceof IResource) {
                    return formatResourceMessage((IResource) elem);
                    //        } else if (elem instanceof PackageFragmentRootContainer) {
                    //          PackageFragmentRootContainer container = (PackageFragmentRootContainer) elem;
                    //          return container.getLabel() + DartElementLabels.CONCAT_STRING
                    //              + container.getJavaProject().getElementName();
                    //        } else if (elem instanceof IJarEntryResource) {
                    //          IJarEntryResource jarEntryResource = (IJarEntryResource) elem;
                    //          StringBuffer buf = new StringBuffer(jarEntryResource.getName());
                    //          buf.append(DartElementLabels.CONCAT_STRING);
                    //          IPath fullPath = jarEntryResource.getFullPath();
                    //          if (fullPath.segmentCount() > 1) {
                    //            buf.append(fullPath.removeLastSegments(1).makeRelative());
                    //            buf.append(DartElementLabels.CONCAT_STRING);
                    //          }
                    //          DartElementLabels.getPackageFragmentRootLabel(
                    //              jarEntryResource.getPackageFragmentRoot(),
                    //              DartElementLabels.ROOT_POST_QUALIFIED, buf);
                    //          return buf.toString();
                } else if (elem instanceof IAdaptable) {
                    IWorkbenchAdapter wbadapter = (IWorkbenchAdapter) ((IAdaptable) elem)
                            .getAdapter(IWorkbenchAdapter.class);
                    if (wbadapter != null) {
                        return wbadapter.getLabel(elem);
                    }
                }
            }
        }
        return ""; //$NON-NLS-1$
    }

    private String formatJavaElementMessage(DartElement element) {
        return DartElementLabels.getElementLabel(element, LABEL_FLAGS);
    }

    private String formatResourceMessage(IResource element) {
        IContainer parent = element.getParent();
        if (parent != null && parent.getType() != IResource.ROOT) {
            return element.getName() + DartElementLabels.CONCAT_STRING
                    + parent.getFullPath().makeRelative().toString();
        } else {
            return element.getName();
        }
    }

}