com.centurylink.mdw.plugin.designer.properties.value.DefaultViewerComparator.java Source code

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Here is the source code for com.centurylink.mdw.plugin.designer.properties.value.DefaultViewerComparator.java

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/*
 * Copyright (C) 2017 CenturyLink, Inc.
 *
 * 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.centurylink.mdw.plugin.designer.properties.value;

import org.apache.commons.beanutils.PropertyUtilsBean;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.swt.SWT;

import com.centurylink.mdw.plugin.PluginMessages;
import com.centurylink.mdw.plugin.designer.properties.editor.ColumnSpec;

public class DefaultViewerComparator extends ViewerComparator {
    private String property;
    private SortDirectionProvider sortDirectionProvider;
    private PropertyUtilsBean propUtilsBean = new PropertyUtilsBean();

    public DefaultViewerComparator(ColumnSpec colSpec, SortDirectionProvider sortDirectionProvider) {
        this.property = colSpec.property;
        this.sortDirectionProvider = sortDirectionProvider;
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public int compare(Viewer viewer, Object element1, Object element2) {
        try {
            Comparable c1 = (Comparable) propUtilsBean.getProperty(element1, property);
            Comparable c2 = (Comparable) propUtilsBean.getProperty(element2, property);
            if (sortDirectionProvider.getSortDirection() == SWT.UP) {
                if (c1 == null)
                    return -1;
                else if (c2 == null)
                    return 1;
                return c1.compareTo(c2);
            } else {
                if (c2 == null)
                    return -1;
                else if (c1 == null)
                    return 1;
                return c2.compareTo(c1);
            }
        } catch (Exception ex) {
            PluginMessages.log(ex);
            return 0;
        }
    }

    public interface SortDirectionProvider {
        public int getSortDirection();
    }
}