Source Code

    /*
     * 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.Random;

    import javax.servlet.jsp.JspException;
    import javax.servlet.jsp.tagext.JspFragment;
    import javax.servlet.jsp.tagext.SimpleTagSupport;

    /**
     * SimpleTag handler that accepts takes three attributes of type
     * JspFragment and invokes then in a random order.
     */
    public class ShuffleSimpleTag extends SimpleTagSupport {
        // No need for this to use SecureRandom
        private static final Random random = new Random();

        private JspFragment fragment1;
        private JspFragment fragment2;
        private JspFragment fragment3;

        @Override
        public void doTag() throws JspException, IOException {
            switch(random.nextInt(6)) {
                case 0:
                    fragment1.invoke( null );
                    fragment2.invoke( null );
                    fragment3.invoke( null );
                    break;
                case 1:
                    fragment1.invoke( null );
                    fragment3.invoke( null );
                    fragment2.invoke( null );
                    break;
                case 2:
                    fragment2.invoke( null );
                    fragment1.invoke( null );
                    fragment3.invoke( null );
                    break;
                case 3:
                    fragment2.invoke( null );
                    fragment3.invoke( null );
                    fragment1.invoke( null );
                    break;
                case 4:
                    fragment3.invoke( null );
                    fragment1.invoke( null );
                    fragment2.invoke( null );
                    break;
                case 5:
                    fragment3.invoke( null );
                    fragment2.invoke( null );
                    fragment1.invoke( null );
                    break;
            }
        }

        public void setFragment1( JspFragment fragment1 ) {
            this.fragment1 = fragment1;
        }

        public void setFragment2( JspFragment fragment2 ) {
            this.fragment2 = fragment2;
        }

        public void setFragment3( JspFragment fragment3 ) {
            this.fragment3 = fragment3;
        }
    }