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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2005-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.xml.stream.buffer;

import org.xml.sax.Attributes;

/**
 * Class for holding attributes.
 *
 * Since it implements {@link Attributes}, this class follows the SAX convention
 * of using "" instead of null.
 */
@SuppressWarnings({"PointlessArithmeticExpression"})
public final class AttributesHolder implements Attributes {
    private static final int DEFAULT_CAPACITY = 8;
    private static final int ITEM_SIZE = 1 << 3;

    private static final int PREFIX     = 0;
    private static final int URI        = 1;
    private static final int LOCAL_NAME = 2;
    private static final int QNAME      = 3;
    private static final int TYPE       = 4;
    private static final int VALUE      = 5;

    private int _attributeCount;

    private String[] _strings;

    public AttributesHolder() {
        _strings = new String[DEFAULT_CAPACITY * ITEM_SIZE];
    }

    public final int getLength() {
        return _attributeCount;
    }

    public final String getPrefix(int index) {
        return (index >= 0 && index < _attributeCount) ?
            _strings[(index << 3) + PREFIX] : null;
    }

    public final String getLocalName(int index) {
        return (index >= 0 && index < _attributeCount) ?
            _strings[(index << 3) + LOCAL_NAME] : null;
    }

    public final String getQName(int index) {
        return (index >= 0 && index < _attributeCount) ?
            _strings[(index << 3) + QNAME] : null;
    }

    public final String getType(int index) {
        return (index >= 0 && index < _attributeCount) ?
            _strings[(index << 3) + TYPE] : null;
    }

    public final String getURI(int index) {
        return (index >= 0 && index < _attributeCount) ?
            _strings[(index << 3) + URI] : null;
    }

    public final String getValue(int index) {
        return (index >= 0 && index < _attributeCount) ?
            _strings[(index << 3) + VALUE] : null;
    }

    public final int getIndex(String qName) {
        for (int i = 0; i < _attributeCount; i++) {
            if (qName.equals(_strings[(i << 3) + QNAME])) {
                return i;
            }
        }
        return -1;
    }

    public final String getType(String qName) {
        final int i = (getIndex(qName) << 3) + TYPE;
        return (i >= 0) ? _strings[i] : null;
    }

    public final String getValue(String qName) {
        final int i = (getIndex(qName) << 3) + VALUE;
        return (i >= 0) ? _strings[i] : null;
    }

    public final int getIndex(String uri, String localName) {
        for (int i = 0; i < _attributeCount; i++) {
            if (localName.equals(_strings[(i << 3) + LOCAL_NAME]) &&
                uri.equals(_strings[(i << 3) + URI])) {
                return i;
            }
        }
        return -1;
    }

    public final String getType(String uri, String localName) {
        final int i = (getIndex(uri, localName) << 3) + TYPE;
        return (i >= 0) ? _strings[i] : null;
    }

    public final String getValue(String uri, String localName) {
        final int i = (getIndex(uri, localName) << 3) + VALUE;
        return (i >= 0) ? _strings[i] : null;
    }

    public final void clear() {
        if (_attributeCount > 0) {
            for (int i = 0; i < _attributeCount; i++) {
                _strings[(i << 3) + VALUE] = null;
            }
            _attributeCount = 0;
        }
    }


    /**
     * Add an attribute using a qualified name that contains the 
     * prefix and local name.
     *
     * @param uri
     *      This can be empty but not null, just like everywhere else in SAX.
     */
    public final void addAttributeWithQName(String uri, String localName, String qName, String type, String value) {
        final int i = _attributeCount << 3;
        if (i == _strings.length) {
            resize(i);
        }

        _strings[i + PREFIX] = null;
        _strings[i + URI] = uri;
        _strings[i + LOCAL_NAME] = localName;
        _strings[i + QNAME] = qName;
        _strings[i + TYPE] = type;
        _strings[i + VALUE] = value;

        _attributeCount++;
    }

    /**
     * Add an attribute using a prefix.
     *
     * @param prefix
     *      This can be empty but not null, just like everywhere else in SAX.
     * @param uri
     *      This can be empty but not null, just like everywhere else in SAX.
     */
    public final void addAttributeWithPrefix(String prefix, String uri, String localName, String type, String value) {
        final int i = _attributeCount << 3;
        if (i == _strings.length) {
            resize(i);
        }

        _strings[i + PREFIX] = prefix;
        _strings[i + URI] = uri;
        _strings[i + LOCAL_NAME] = localName;
        _strings[i + QNAME] = null;
        _strings[i + TYPE] = type;
        _strings[i + VALUE] = value;

        _attributeCount++;
    }

    private void resize(int length) {
        final int newLength = length * 2;
        final String[] strings = new String[newLength];
        System.arraycopy(_strings, 0, strings, 0, length);
        _strings = strings;
    }

}