    /*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 jsp2.examples.simpletag;

    import java.io.IOException;
    import java.util.ArrayList;

    import javax.servlet.jsp.JspException;
    import javax.servlet.jsp.JspWriter;
    import javax.servlet.jsp.tagext.DynamicAttributes;
    import javax.servlet.jsp.tagext.SimpleTagSupport;

    /**
     * SimpleTag handler that echoes all its attributes
     */
    public class EchoAttributesTag
        extends SimpleTagSupport
        implements DynamicAttributes
    {
        private final ArrayList<String> keys = new ArrayList<>();
        private final ArrayList<Object> values = new ArrayList<>();

        @Override
        public void doTag() throws JspException, IOException {
            JspWriter out = getJspContext().getOut();
            for( int i = 0; i < keys.size(); i++ ) {
                String key = keys.get( i );
                Object value = values.get( i );
                out.println( "<li>" + key + " = " + value + "</li>" );
            }
        }

        @Override
        public void setDynamicAttribute( String uri, String localName,
            Object value )
            throws JspException
        {
            keys.add( localName );
            values.add( value );
        }
    }