SwitchPreviousEditorAction.java

/*******************************************************************************
 * Copyright (c) 2012-2017 Codenvy, S.A.
 * 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
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.part.editor.actions;

import com.google.inject.Inject;
import com.google.inject.Singleton;

import org.eclipse.che.ide.CoreLocalizationConstant;
import org.eclipse.che.ide.api.action.ActionEvent;
import org.eclipse.che.ide.api.editor.EditorAgent;
import org.eclipse.che.ide.api.editor.EditorPartPresenter;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Switch to previous opened editor based on current active.
 *
 * @author Vlad Zhukovskyi
 * @author Roman Nikitenko
 */
@Singleton
public class SwitchPreviousEditorAction extends EditorSwitchAction {

    @Inject
    public SwitchPreviousEditorAction(CoreLocalizationConstant constant,
                                      EditorAgent editorAgent) {
        super(constant.switchToLeftEditorAction(), constant.switchToLeftEditorActionDescription(), editorAgent);
    }

    /** {@inheritDoc} */
    @Override
    public void actionPerformed(ActionEvent event) {
        final EditorPartPresenter activeEditor = editorAgent.getActiveEditor();

        checkNotNull(activeEditor, "Null editor occurred");

        final EditorPartPresenter previousEditor = getPreviousEditorBaseOn(activeEditor);
        editorAgent.activateEditor(previousEditor);
    }
}