    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
    015package org.apache.tapestry5.plastic;
    016
    017/**
    018 * Callback used with {@link InstructionBuilder#doWhile(Condition, WhileCallback)}.
    019 */
    020public interface WhileCallback
    021{
    022    /**
    023     * Creates the code to be evaluated by the {@link Condition}; often this involves
    024     * loading a value from a variable or argument, or {@link InstructionBuilder#dupe()}'ing the
    025     * top value on the stack.
    026     */
    027    void buildTest(InstructionBuilder builder);
    028
    029    /**
    030     * Provides the main code executed inside the loop.
    031     */
    032    void buildBody(InstructionBuilder builder);
    033}