com.eyeq.pivot4j.sort.SortMode.java Source code

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Here is the source code for com.eyeq.pivot4j.sort.SortMode.java

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/*
 * ====================================================================
 * This software is subject to the terms of the Common Public License
 * Agreement, available at the following URL:
 *   http://www.opensource.org/licenses/cpl.html .
 * You must accept the terms of that agreement to use this software.
 * ====================================================================
 */
package com.eyeq.pivot4j.sort;

import java.io.Serializable;
import java.lang.reflect.Field;

import org.apache.commons.lang.NullArgumentException;

import com.eyeq.pivot4j.PivotException;
import com.eyeq.pivot4j.PivotModel;

public abstract class SortMode implements Serializable {

    private static final long serialVersionUID = 3571398856078189701L;

    public static final SortMode BASIC = new SortMode() {

        private static final long serialVersionUID = 3622337346091896703L;

        @Override
        public String getName() {
            return "basic";
        }

        @Override
        public SortCriteria nextMode(SortCriteria mode) {
            if (mode == null) {
                return SortCriteria.ASC;
            } else if (mode == SortCriteria.ASC) {
                return SortCriteria.DESC;
            } else {
                return null;
            }
        }
    };

    public static final SortMode BREAKING = new SortMode() {

        private static final long serialVersionUID = 7472926285648718374L;

        @Override
        public String getName() {
            return "breaking";
        }

        @Override
        public SortCriteria nextMode(SortCriteria mode) {
            if (mode == null) {
                return SortCriteria.BASC;
            } else if (mode == SortCriteria.BASC) {
                return SortCriteria.BDESC;
            } else {
                return null;
            }
        }
    };

    public static final SortMode COUNT = new SortMode() {

        private static final long serialVersionUID = -3751113668954135001L;

        @Override
        public String getName() {
            return "count";
        }

        @Override
        public SortCriteria nextMode(SortCriteria mode) {
            if (mode == null) {
                return SortCriteria.TOPCOUNT;
            } else if (mode == SortCriteria.TOPCOUNT) {
                return SortCriteria.BOTTOMCOUNT;
            } else {
                return null;
            }
        }
    };

    /**
     * @param name
     * @return
     */
    public static SortMode fromName(String name) {
        Field[] fields = SortMode.class.getFields();

        for (Field field : fields) {
            Object value;

            try {
                value = field.get(null);
            } catch (Exception e) {
                throw new PivotException(e);
            }

            if (value instanceof SortMode) {
                SortMode mode = (SortMode) value;

                if (name.equals(mode.getName())) {
                    return mode;
                }
            }
        }

        return null;
    }

    public abstract String getName();

    public abstract SortCriteria nextMode(SortCriteria mode);

    /**
     * @param model
     */
    public void toggleSort(PivotModel model) {
        if (model == null) {
            throw new NullArgumentException("model");
        }

        SortCriteria currentCriteria = null;
        if (model.isSorting()) {
            currentCriteria = model.getSortCriteria();
        }

        SortCriteria criteria = nextMode(currentCriteria);
        if (criteria == null) {
            model.setSorting(false);
        } else {
            model.setSorting(true);
            model.setSortCriteria(criteria);
        }
    }
}