SortFilter.java

/*******************************************************************************
 * Copyright (c) 2006 IBM Corporation.
 * 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:
 *     IBM Corporation - Jeff Briggs, Henry Hughes, Ryan Morse
 *******************************************************************************/

package org.eclipse.linuxtools.systemtap.graphing.core.filters;

import java.util.List;

import org.eclipse.linuxtools.internal.systemtap.graphing.core.Localization;
import org.eclipse.linuxtools.systemtap.graphing.core.structures.NumberType;
import org.eclipse.linuxtools.systemtap.structures.Copier;
import org.eclipse.linuxtools.systemtap.structures.IndexedObject;
import org.eclipse.linuxtools.systemtap.structures.Sort;



public class SortFilter implements IDataSetFilter {
    public SortFilter(int column, int ordering) {
        this.column = column;
        this.style = (ordering==ASCENDING ? ASCENDING : DESCENDING);
    }

    /**
     * Apply the RangeFilter to the passed dataset.
     *
     * @param data The dataset to filter.
     *
     * @return The filtered dataset.
     */
    @Override
    public List<Object>[] filter(List<Object>[] data) {
        if(column < 0 || column >= data.length)
            return null;

        List<Object>[] newData = Copier.copy(data);
        IndexedObject[] items = new IndexedObject[newData[0].size()];

        try {
            for(int i=0; i<newData[column].size(); i++)
                items[i] = new IndexedObject(i, NumberType.cleanObj2Num(newData[column].get(i)));
        } catch(NumberFormatException nfe) {
            for(int i=0; i<newData[column].size(); i++)
                items[i] = new IndexedObject(i, newData[column].get(i));
        }

        Sort.quicksort(items, 0, items.length-1);

        for(int j, i=0; i<newData.length; i++) {
            for(j=0; j<items.length; j++) {
                if(DESCENDING == style)
                    newData[i].add(newData[i].get(items[items.length-j-1].index));
                else
                    newData[i].add(newData[i].get(items[j].index));
            }
            for(j=0; j<items.length; j++)
                newData[i].remove(0);
        }
        return newData;
    }

    @Override
    public String getID() {
        return ID;
    }

    /**
     * @since 2.0
     */
    @Override
    public String getInfo() {
        return Localization.getString(style == ASCENDING ? "SortFilter.Ascending" : "SortFilter.Descending"); //$NON-NLS-1$ //$NON-NLS-2$
    }

    /**
     * @since 2.0
     */
    @Override
    public int getColumn() {
        return column;
    }

    private int column;
    private int style;

    public static final int ASCENDING = 0;
    public static final int DESCENDING = 1;
    public static final String ID = "org.eclipse.linuxtools.systemtap.graphing.core.filters.SortFilter"; //$NON-NLS-1$
}