/*

 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package sun.tools.jstat;

import java.util.*;

/**

 * A typesafe enumeration for describing data alignment semantics

 *

 * @author Brian Doherty

 * @since 1.5

 */

public abstract class Alignment {

    private static int nextOrdinal = 0;

    private static HashMap<String, Alignment> map = new HashMap<String, Alignment>();

    private static final String blanks = "                                                                                                                                                               ";

    private final String name;

    private final int value = nextOrdinal++;

    protected abstract String align(String s, int width);

    /**

     * Alignment representing a Centered alignment

     */

    public static final Alignment CENTER = new Alignment("center") {

        protected String align(String s, int width) {

            int length = s.length();

            if (length >= width) {

                return s;

            }

            int pad = width - length;

            int pad2 = pad / 2;

            int padr = pad % 2;

            if (pad2 == 0) {

              // only 0 or 1 character to pad

              return s + blanks.substring(0, padr);

            } else {

              // pad on both sides

              return  blanks.substring(0, pad2) + s +

                      blanks.substring(0, pad2 + padr);

            }

        }

    };

    /**

     * Alignment representing a Left alignment

     */

    public static final Alignment LEFT = new Alignment("left") {

        protected String align(String s, int width) {

            int length = s.length();

            if (length >= width) {

                return s;

            }

            int pad = width - length;

            return s+blanks.substring(0, pad);

        }

    };

    /**

     * Alignment representing a Right alignment

     */

    public static final Alignment RIGHT = new Alignment("right") {

        protected String align(String s, int width) {

            int length = s.length();

            if (length >= width) {

                return s;

            }

            int pad = width - length;

            return blanks.substring(0, pad) + s;

        }

    };

    /**

     * Maps a string value to its corresponding Alignment object.

     *

     * @param   s  an string to match against Alignment objects.

     * @return     The Alignment object matching the given string.

     */

    public static Alignment toAlignment(String s) {

        return map.get(s);

    }

    /**

     * Returns an enumeration of the keys for this enumerated type

     *

     * @return     Set of Key Words for this enumeration.

     */

    public static Set<String> keySet() {

        return map.keySet();

    }

    public String toString() {

        return name;

    }

    private Alignment(String name) {

        this.name = name;

        map.put(name, this);

    }

}