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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed 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.xmlbeans.impl.common;

import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.SimpleValue;

/**
 * A class to hold and compare a list of XmlObjects for use by keys
 * keyrefs during validation.
 */
public class XmlObjectList
{
    private final XmlObject[] _objects;

    /**
     * Construct a new empty object list of the given fixed size.
     */
    public XmlObjectList(int objectCount) {
        _objects = new XmlObject[objectCount];
    }

    /**
     * Set an object by index unless a value has been previously
     * set at that location.
     *
     * @return true if the value was set, false if the value has
     * already been set
     */
    public boolean set(XmlObject o, int index)
    {
        if (_objects[index] != null)
            return false;

        _objects[index] = o;
        return true;
    }

    /**
     * Tests that all values have been set. Needed for keys.
     */
    public boolean filled() {
        for (int i = 0 ; i < _objects.length ; i++)
            if (_objects[i] == null) return false;

        return true;
    }

    /**
     * Tests that all values have been set. Needed for keys.
     */
    public int unfilled()
    {
        for (int i = 0 ; i < _objects.length ; i++)
            if (_objects[i] == null) return i;

        return -1;
    }

    public boolean equals(Object o) {
        if (!( o instanceof XmlObjectList))
            return false;

        XmlObjectList other = (XmlObjectList)o;

        if (other._objects.length != this._objects.length)
            return false;

        for (int i = 0 ; i < _objects.length ; i++) {
            // Ignore missing values
            if (_objects[i] == null || other._objects[i] == null)
                return false;

            if (! _objects[i].valueEquals(other._objects[i]))
                return false;
        }

        return true;
    }

    public int hashCode()
    {
        int h = 0;

        for (int i = 0 ; i < _objects.length ; i++)
            if (_objects[i] != null)
                h = 31 * h + _objects[i].valueHashCode();

        return h;
    }
    
    private static String prettytrim(String s)
    {
        int end;
        for (end = s.length(); end > 0; end -= 1)
        {
            if (!XMLChar.isSpace(s.charAt(end - 1)))
                break;
        }
        int start;
        for (start = 0; start < end; start += 1)
        {
            if (!XMLChar.isSpace(s.charAt(start)))
                break;
        }
        return s.substring(start, end);
    }

    public String toString() {
        StringBuffer b = new StringBuffer();

        for (int i = 0 ; i < _objects.length ; i++)
        {
            if (i != 0) b.append(" ");
            b.append(prettytrim(((SimpleValue)_objects[i]).getStringValue()));
        }

        return b.toString();
    }
}