001    // Copyright 2011 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    // http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.plastic;
016    
017    /**
018     * Support for building the equivalent of a Java switch statement.
019     */
020    public interface SwitchBlock
021    {
022        /**
023         * Adds a handler for a particular case value. This method should only be invoked at most once for each case
024         * value.
025         * 
026         * @param caseValue
027         *            value to match
028         * @param jumpToEnd
029         *            true if a jump to the end should be provided, or false
030         *            if either the callback generated a return opcode, or
031         *            it is desired to "drop down" into the next case handler.
032         *            The last case handled drop down out of the SwitchBlock.
033         * @param callback
034         *            provides the logic for the specified case
035         */
036        void addCase(int caseValue, boolean jumpToEnd, InstructionBuilderCallback callback);
037    
038        /**
039         * Adds the default handler. This is optional, and is only allowed after all cases have been added.
040         * The default handler automatically throws an {@link IllegalArgumentException}.
041         * 
042         * @param callback
043         *            provides the logic for the default handler case.
044         */
045        void addDefault(InstructionBuilderCallback callback);
046    
047    }