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Ant example source code file (DeweyDecimal.java)

This example Ant source code file (DeweyDecimal.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

deweydecimal, deweydecimal, empty, exact, exact, numberformatexception, numberformatexception, string, string, stringbuffer, stringtokenizer, util

The DeweyDecimal.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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 org.apache.tools.ant.util;

import java.util.StringTokenizer;

/**
 * Utility class to contain version numbers in "Dewey Decimal"
 * syntax.  Numbers in the "Dewey Decimal" syntax consist of positive
 * decimal integers separated by periods ".".  For example, "2.0" or
 * "1.2.3.4.5.6.7".  This allows an extensible number to be used to
 * represent major, minor, micro, etc versions.  The version number
 * must begin with a number.
 *
 */
public class DeweyDecimal {

    /** Array of components that make up DeweyDecimal */
    private int[] components;

    /**
     * Construct a DeweyDecimal from an array of integer components.
     *
     * @param components an array of integer components.
     */
    public DeweyDecimal(final int[] components) {
        this.components = new int[components.length];

        for (int i = 0; i < components.length; i++) {
            this.components[i] = components[i];
        }
    }

    /**
     * Construct a DeweyDecimal from string in DeweyDecimal format.
     *
     * @param string the string in dewey decimal format
     * @exception NumberFormatException if string is malformed
     */
    public DeweyDecimal(final String string)
        throws NumberFormatException {
        final StringTokenizer tokenizer = new StringTokenizer(string, ".", true);
        final int size = tokenizer.countTokens();

        components = new int[ (size + 1) / 2 ];

        for (int i = 0; i < components.length; i++) {
            final String component = tokenizer.nextToken();
            if (component.equals("")) {
                throw new NumberFormatException("Empty component in string");
            }

            components[ i ] = Integer.parseInt(component);

            //Strip '.' token
            if (tokenizer.hasMoreTokens()) {
                tokenizer.nextToken();

                //If it ended in a dot, throw an exception
                if (!tokenizer.hasMoreTokens()) {
                    throw new NumberFormatException("DeweyDecimal ended in a '.'");
                }
            }
        }
    }

    /**
     * Return number of components in <code>DeweyDecimal.
     *
     * @return the number of components in dewey decimal
     */
    public int getSize() {
        return components.length;
    }

    /**
     * Return the component at specified index.
     *
     * @param index the index of components
     * @return the value of component at index
     */
    public int get(final int index) {
        return components[ index ];
    }

    /**
     * Return <code>true if this DeweyDecimal is
     * equal to the other <code>DeweyDecimal.
     *
     * @param other the other DeweyDecimal
     * @return true if equal to other DeweyDecimal, false otherwise
     */
    public boolean isEqual(final DeweyDecimal other) {
        final int max = Math.max(other.components.length, components.length);

        for (int i = 0; i < max; i++) {
            final int component1 = (i < components.length) ? components[ i ] : 0;
            final int component2 = (i < other.components.length) ? other.components[ i ] : 0;

            if (component2 != component1) {
                return false;
            }
        }

        return true; // Exact match
    }

    /**
     * Return <code>true if this DeweyDecimal is
     * less than the other <code>DeweyDecimal.
     *
     * @param other the other DeweyDecimal
     * @return true if less than other DeweyDecimal, false otherwise
     */
    public boolean isLessThan(final DeweyDecimal other) {
        return !isGreaterThanOrEqual(other);
    }

    /**
     * Return <code>true if this DeweyDecimal is
     * less than or equal to the other <code>DeweyDecimal.
     *
     * @param other the other DeweyDecimal
     * @return true if less than or equal to other DeweyDecimal, false otherwise
     */
    public boolean isLessThanOrEqual(final DeweyDecimal other) {
        return !isGreaterThan(other);
    }

    /**
     * Return <code>true if this DeweyDecimal is
     * greater than the other <code>DeweyDecimal.
     *
     * @param other the other DeweyDecimal
     * @return true if greater than other DeweyDecimal, false otherwise
     */
    public boolean isGreaterThan(final DeweyDecimal other) {
        final int max = Math.max(other.components.length, components.length);

        for (int i = 0; i < max; i++) {
            final int component1 = (i < components.length) ? components[ i ] : 0;
            final int component2 = (i < other.components.length) ? other.components[ i ] : 0;

            if (component2 > component1) {
                return false;
            }
            if (component2 < component1) {
                return true;
            }
        }

        return false; // Exact match
    }

    /**
     * Return <code>true if this DeweyDecimal is
     * greater than or equal to the other <code>DeweyDecimal.
     *
     * @param other the other DeweyDecimal
     * @return true if greater than or equal to other DeweyDecimal, false otherwise
     */
    public boolean isGreaterThanOrEqual(final DeweyDecimal other) {
        final int max = Math.max(other.components.length, components.length);

        for (int i = 0; i < max; i++) {
            final int component1 = (i < components.length) ? components[ i ] : 0;
            final int component2 = (i < other.components.length) ? other.components[ i ] : 0;

            if (component2 > component1) {
                return false;
            }
            if (component2 < component1) {
                return true;
            }
        }

        return true; // Exact match
    }

    /**
     * Return string representation of <code>DeweyDecimal.
     *
     * @return the string representation of DeweyDecimal.
     */
    public String toString() {
        final StringBuffer sb = new StringBuffer();

        for (int i = 0; i < components.length; i++) {
            if (i != 0) {
                sb.append('.');
            }
            sb.append(components[ i ]);
        }

        return sb.toString();
    }
}

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