org.apache.directory.studio.openldap.config.model.widgets.LockDetectWidget.java Source code

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Here is the source code for org.apache.directory.studio.openldap.config.model.widgets.LockDetectWidget.java

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/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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 org.apache.directory.studio.openldap.config.model.widgets;

import org.apache.directory.studio.common.ui.widgets.AbstractWidget;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.apache.directory.studio.openldap.config.model.database.OlcBdbConfigLockDetectEnum;

/**
 * The LockDetectWidget provides a combo to select the Lock Detect value.
 * 
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
public class LockDetectWidget extends AbstractWidget {
    /** The combo viewer's values */
    private Object[] comboViewerValues = new Object[] { new NoneObject(), OlcBdbConfigLockDetectEnum.DEFAULT,
            OlcBdbConfigLockDetectEnum.RANDOM, OlcBdbConfigLockDetectEnum.OLDEST,
            OlcBdbConfigLockDetectEnum.YOUNGEST, OlcBdbConfigLockDetectEnum.FEWEST };

    /** The selected value */
    private OlcBdbConfigLockDetectEnum value;

    // UI widgets
    private ComboViewer comboViewer;

    /**
     * Creates a new instance of LockDetectWidget.
     */
    public LockDetectWidget() {
    }

    /**
     * Creates the widget.
     * 
     * @param parent the parent
     */
    public void createWidget(Composite parent) {
        createWidget(parent, null);
    }

    /**
     * Creates the widget.
     * 
     * @param parent the parent
     * @param toolkit the toolkit
     */
    public void createWidget(Composite parent, FormToolkit toolkit) {
        // Combo
        comboViewer = new ComboViewer(parent);
        comboViewer.setContentProvider(new ArrayContentProvider());
        comboViewer.setLabelProvider(new LabelProvider() {
            @Override
            public String getText(Object element) {
                if (element instanceof NoneObject) {
                    return "(No value)";
                } else if (element instanceof OlcBdbConfigLockDetectEnum) {
                    OlcBdbConfigLockDetectEnum lockDetect = (OlcBdbConfigLockDetectEnum) element;

                    switch (lockDetect) {
                    case OLDEST:
                        return "Oldest";
                    case YOUNGEST:
                        return "Youngest";
                    case FEWEST:
                        return "Fewest";
                    case RANDOM:
                        return "Random";
                    case DEFAULT:
                        return "Default";
                    }
                }

                return super.getText(element);
            }
        });
        comboViewer.addSelectionChangedListener(event -> {
            value = null;

            StructuredSelection selection = (StructuredSelection) comboViewer.getSelection();

            if (!selection.isEmpty()) {
                Object selectedObject = selection.getFirstElement();

                if (selectedObject instanceof OlcBdbConfigLockDetectEnum) {
                    value = (OlcBdbConfigLockDetectEnum) selectedObject;
                }
            }

            notifyListeners();
        });
        comboViewer.setInput(comboViewerValues);
        comboViewer.setSelection(new StructuredSelection(comboViewerValues[0]));
    }

    /**
     * Sets the value.
     *
     * @param value the value
     */
    public void setValue(OlcBdbConfigLockDetectEnum value) {
        this.value = value;

        if (value == null) {
            comboViewer.setSelection(new StructuredSelection(comboViewerValues[0]));
        } else {
            comboViewer.setSelection(new StructuredSelection(value));
        }
    }

    /**
     * Gets the value.
     *
     * @return the value
     */
    public OlcBdbConfigLockDetectEnum getValue() {
        return value;
    }

    /**
     * Returns the primary control associated with this widget.
     *
     * @return the primary control associated with this widget.
     */
    public Control getControl() {
        return comboViewer.getControl();
    }

    class NoneObject {
    }
}