/*
 * Copyright (c) 2012, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package jdk.internal.util.xml.impl;


/**
 * A name with value pair.
 *
 * This class keeps name with value pair with additional information and 
 * supports pair chaining.
 */
public class Pair {

    /** The pair name. */
    public String name;
    /** The pair value. */
    public String value;
    /** The pair numeric value. */
    public int num;
    /** The characters of name. */
    public char[] chars;
    /** The pair identifier. */
    public int id;
    /** The list of associated pairs. */
    public Pair list;
    /** The next pair in a chain. */
    public Pair next;

    /**
     * Creates a qualified name string from qualified name.
     *
     * @return The qualified name string.
     */
    public String qname() {
        return new String(chars, 1, chars.length - 1);
    }

    /**
     * Creates a local name string from qualified name.
     *
     * @return The local name string.
     */
    public String local() {
        if (chars[0] != 0) {
            return new String(chars, chars[0] + 1, chars.length - chars[0] - 1);
        }
        return new String(chars, 1, chars.length - 1);
    }

    /**
     * Creates a prefix string from qualified name.
     *
     * @return The prefix string.
     */
    public String pref() {
        if (chars[0] != 0) {
            return new String(chars, 1, chars[0] - 1);
        }
        return "";
    }

    /**
     * Compares two qualified name prefixes.
     *
     * @param qname A qualified name.
     * @return true if prefixes are equal.
     */
    public boolean eqpref(char[] qname) {
        if (chars[0] == qname[0]) {
            char len = chars[0];
            for (char i = 1; i < len; i += 1) {
                if (chars[i] != qname[i]) {
                    return false;
                }
            }
            return true;
        }
        return false;
    }

    /**
     * Compares two qualified names.
     *
     * @param qname A qualified name.
     * @return true if qualified names are equal.
     */
    public boolean eqname(char[] qname) {
        char len = (char) chars.length;
        if (len == qname.length) {
            for (char i = 0; i < len; i += 1) {
                if (chars[i] != qname[i]) {
                    return false;
                }
            }
            return true;
        }
        return false;
    }
}