org.sventon.util.RepositoryEntrySorter.java Source code

Introduction

Here is the source code for org.sventon.util.RepositoryEntrySorter.java

Source

/*
 * ====================================================================
 * Copyright (c) 2005-2010 sventon project. All rights reserved.
 *
 * This software is licensed as described in the file LICENSE, which
 * you should have received as part of this distribution. The terms
 * are also available at http://www.sventon.org.
 * If newer versions of this license are posted there, you may use a
 * newer version instead, at your option.
 * ====================================================================
 */
package org.sventon.util;

import org.apache.commons.lang.Validate;
import org.sventon.model.RepositoryEntry;

import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * Sorts collections of <code>RepositoryEntry</code> instances.
 *
 * @author jesper@sventon.org
 */
public final class RepositoryEntrySorter {

    /**
     * Available sort modes.
     */
    public enum SortMode {

        /**
         * Ascending sort.
         */
        ASC,

        /**
         * Descending sort.
         */
        DESC
    }

    /**
     * Field to sort on.
     */
    private final RepositoryEntryComparator.SortType sortType;

    /**
     * The sort mode, ascending or descending.
     */
    private final SortMode sortMode;

    /**
     * Constructor.
     *
     * @param sortType Field to sort on.
     * @param sortMode Sort mode, ascending or descending.
     */
    public RepositoryEntrySorter(final RepositoryEntryComparator.SortType sortType, final SortMode sortMode) {
        Validate.notNull(sortType, "sortType cannot be null");
        Validate.notNull(sortMode, "sortMode cannot be null");
        this.sortType = sortType;
        this.sortMode = sortMode;
    }

    /**
     * Sorts given list.
     *
     * @param entries Entries to sort.
     */
    public void sort(final List<RepositoryEntry> entries) {
        final Comparator<RepositoryEntry> comparator;
        if (sortMode == SortMode.DESC) {
            comparator = Collections.reverseOrder(new RepositoryEntryComparator(sortType, true));
        } else {
            comparator = new RepositoryEntryComparator(sortType, true);
        }
        Collections.sort(entries, comparator);
    }

}