/*

 * Copyright (c) 2008, 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.beans.decoder;

/**

 * This class is intended to handle <char> element.

 * This element specifies {@code char} values.

 * The class {@link Character} is used as wrapper for these values.

 * The result value is created from text of the body of this element.

 * The body parsing is described in the class {@link StringElementHandler}.

 * For example:<pre>

 * &lt;char&gt;X&lt;/char&gt;</pre>

 * which is equivalent to {@code Character.valueOf('X')} in Java code.

 * <p>The following attributes are supported:

 * <dl>

 * <dt>code

 * <dd>this attribute specifies character code

 * <dt>id

 * <dd>the identifier of the variable that is intended to store the result

 * </dl>

 * The {@code code} attribute can be used for characters

 * that are illegal in XML document, for example:<pre>

 * &lt;char code="0"/&gt;</pre>

 *

 * @since 1.7

 *

 * @author Sergey A. Malenkov

 */

final class CharElementHandler extends StringElementHandler {

    /**

     * Parses attributes of the element.

     * The following attributes are supported:

     * <dl>

     * <dt>code

     * <dd>this attribute specifies character code

     * <dt>id

     * <dd>the identifier of the variable that is intended to store the result

     * </dl>

     *

     * @param name   the attribute name

     * @param value  the attribute value

     */

    @Override

    public void addAttribute(String name, String value) {

        if (name.equals("code")) { // NON-NLS: the attribute name

            int code = Integer.decode(value);

            for (char ch : Character.toChars(code)) {

                addCharacter(ch);

            }

        } else {

            super.addAttribute(name, value);

        }

    }

    /**

     * Creates {@code char} value from

     * the text of the body of this element.

     *

     * @param argument  the text of the body

     * @return evaluated {@code char} value

     */

    @Override

    public Object getValue(String argument) {

        if (argument.length() != 1) {

            throw new IllegalArgumentException("Wrong characters count");

        }

        return Character.valueOf(argument.charAt(0));

    }

}