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/*
 * Copyright 2000,2005 wingS development team.
 *
 * This file is part of wingS (http://wingsframework.org).
 *
 * wingS is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * Please see COPYING for the complete licence.
 */
package org.wings.template;

import org.wings.template.parser.ParseContext;
import org.wings.template.parser.PositionReader;
import org.wings.template.parser.SGMLTag;

import java.io.IOException;

/**
 * A TemplateTagHandler
 *
 * @author Henner Zeller
 */
public class SimpleTagHandler extends TemplateTagHandler {
    /**
     * Parse special tag.
     *
     * @param context  The ParseContext
     * @param input    The PositionReader, located after the Name token of the Tag
     * @param startPosition The Position parsing of this token began
     * @param tag      the SGMLTag found in the file.
     */
    @Override
    public SGMLTag parseTag(ParseContext context,
                            PositionReader input,
                            long startPosition,
                            SGMLTag tag)
            throws IOException {
        /*
         * parse the full tag to get all parameters
         * (i.e. an optional 'format'-parameter)
         * and to place the Reader at the position
         * after the closing '>'
         */
        tag.parse(input);

        /*
         * The Offset is the space the reader skipped
         * before it reached the opening '<'
         *    some garbage 
         * ^----- offset --------------------^
         */
        startPos = startPosition + tag.getOffset();

        /*
         * get required properties
         */
        name = tag.value("NAME", null);
        if (name == null)
            return null;

        context.addContainedComponent(name);

        /*
         * special handling for radio buttons. They react on the
         * constraint name "NAME=VALUE"
         */
        String type = tag.value("TYPE", null);
        if (type != null && "RADIO".equals(type.toUpperCase())) {
            String value = tag.value("VALUE", null);
            if (value != null)
                name = name + '=' + value;
        }

        endPos = input.getPosition();

        properties = tag.getAttributes();
        properties.remove("NAME");
        properties.remove("TYPE");
        properties.remove("VALUE");
        context.setProperties(name, properties);

        return tag;
    }
}