DeleteKeyHandler.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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.motorolamobility.studio.android.certmanager.command;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;

import com.motorola.studio.android.common.utilities.EclipseUtils;
import com.motorolamobility.studio.android.certmanager.exception.KeyStoreManagerException;
import com.motorolamobility.studio.android.certmanager.i18n.CertificateManagerNLS;
import com.motorolamobility.studio.android.certmanager.ui.model.EntryNode;
import com.motorolamobility.studio.android.certmanager.ui.model.IKeyStore;
import com.motorolamobility.studio.android.certmanager.ui.model.ITreeNode;
import com.motorolamobility.studio.android.certmanager.views.KeystoreManagerView;

/**
 * This class deletes the key entry from the tree of the {@link KeystoreManagerView}
 * */
public class DeleteKeyHandler extends AbstractHandler2 implements IHandler
{

    /*
     * Question dialog confirming deletion of the key with a toggle
     * asking if the key should also be deleted from the filesystem
     * @return true if the deletion is confirmed, false otherwise and true in the
     * toggleState if it can also be deleted from the filesystem, false otherwise
     */
    private boolean showQuestion(List<ITreeNode> nodesToDelete)
    {

        final Boolean[] reply = new Boolean[1];

        final String entryName = nodesToDelete.size() == 1 ? nodesToDelete.get(0).getName() : null;

        PlatformUI.getWorkbench().getDisplay().syncExec(new Runnable()
        {
            @Override
            public void run()
            {
                IWorkbench workbench = PlatformUI.getWorkbench();
                IWorkbenchWindow ww = workbench.getActiveWorkbenchWindow();
                Shell shell = ww.getShell();

                reply[0] =
                        MessageDialog
                                .openQuestion(
                                        shell,
                                        CertificateManagerNLS.DeleteKeyHandler_ConfirmationQuestionDialog_Title,
                                        entryName != null
                                                ? CertificateManagerNLS
                                                        .bind(CertificateManagerNLS.DeleteKeyHandler_ConfirmationQuestionDialog_Description,
                                                                entryName)
                                                : CertificateManagerNLS.DeleteKeyHandler_Delete_Selected_Keys);
            }
        });

        return reply[0];
    }

    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException
    {
        List<ITreeNode> nodesToDelete = getSelection();

        if (!nodesToDelete.isEmpty())
        {
            boolean shouldProceed = showQuestion(nodesToDelete);
            if (shouldProceed)
            {
                Map<IKeyStore, List<String>> deleteNodesMap = getKeysMap(nodesToDelete);

                for (IKeyStore keyStore : deleteNodesMap.keySet())
                {
                    try
                    {
                        keyStore.removeKeys(deleteNodesMap.get(keyStore));
                    }
                    catch (KeyStoreManagerException e)
                    {
                        EclipseUtils.showErrorDialog(e);
                        throw new ExecutionException(e.getMessage(), e);
                    }
                }
            }
        }

        nodesToDelete.clear();

        return null;
    }

    private Map<IKeyStore, List<String>> getKeysMap(List<ITreeNode> nodesToDelete)
    {
        Map<IKeyStore, List<String>> deleteNodesMap = new HashMap<IKeyStore, List<String>>();
        for (ITreeNode node2Delete : nodesToDelete)
        {
            if (node2Delete instanceof EntryNode)
            {
                EntryNode entryNode = (EntryNode) node2Delete;
                IKeyStore iKeyStore = (IKeyStore) entryNode.getParent();
                List<String> keyList = deleteNodesMap.get(iKeyStore);
                if (keyList == null)
                {
                    keyList = new ArrayList<String>();
                }
                keyList.add(entryNode.getAlias());
                deleteNodesMap.put(iKeyStore, keyList);
            }
        }
        return deleteNodesMap;
    }
}