/*

 * Copyright (c) 2005, 2013, 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 com.sun.xml.internal.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;

    }

}