com.sap.dirigible.ide.template.ui.common.TemplateFileCommandHandler.java Source code

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Here is the source code for com.sap.dirigible.ide.template.ui.common.TemplateFileCommandHandler.java

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/*******************************************************************************
 * Copyright (c) 2014 SAP AG or an SAP affiliate company. All rights reserved.
 * 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.sap.dirigible.ide.template.ui.common;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.ui.handlers.HandlerUtil;

import com.sap.dirigible.ide.logging.Logger;

public abstract class TemplateFileCommandHandler extends TemplateCommandHandler {

    private static final String SELECTED_RESOURCE_IS_NOT_A_FILE = Messages.TemplateFileCommandHandler_SELECTED_RESOURCE_IS_NOT_A_FILE;
    private static final String NO_FILE_IN_SELECTION_SELECTION_IS_EMPTY = Messages.TemplateFileCommandHandler_NO_FILE_IN_SELECTION_SELECTION_IS_EMPTY;
    private static final String UNKNOWN_SELECTION_TYPE = Messages.TemplateFileCommandHandler_UNKNOWN_SELECTION_TYPE;
    private static final String NO_FILE_SELECTED_WILL_NOT_OPEN_WIZARD = Messages.TemplateFileCommandHandler_NO_FILE_SELECTED_WILL_NOT_OPEN_WIZARD;
    private static final Logger logger = Logger.getLogger(TemplateFileCommandHandler.class);

    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {
        final ISelection selection = HandlerUtil.getCurrentSelection(event);
        final IFile file = getFile(selection);
        if (file != null) {
            openWizard(file);
        } else {
            logger.info(NO_FILE_SELECTED_WILL_NOT_OPEN_WIZARD);
        }
        return null;
    }

    private IFile getFile(ISelection selection) {
        if (!(selection instanceof IStructuredSelection)) {
            logger.warn(UNKNOWN_SELECTION_TYPE);
            return null;
        }
        final IStructuredSelection structuredSelection = (IStructuredSelection) selection;
        if (structuredSelection.isEmpty()) {
            logger.info(NO_FILE_IN_SELECTION_SELECTION_IS_EMPTY);
            return null;
        }
        final Object element = structuredSelection.getFirstElement();
        if (!(element instanceof IFile)) {
            logger.info(SELECTED_RESOURCE_IS_NOT_A_FILE);
            return null;
        }
        return (IFile) element;
    }

    protected abstract Wizard getWizard(IFile file);

    @Override
    protected Wizard getWizard(IResource resource) {
        return getWizard((IFile) resource);
    }

}