001// Copyright 2004, 2005 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.hivemind.conditional; 016 017/** 018 * Provides context when evaluating an AST of {@link org.apache.hivemind.conditional.Node}s. 019 * Effectively, a wrapper around certain runtime operations. 020 * 021 * @author Howard M. Lewis Ship 022 * @since 1.1 023 */ 024public interface EvaluationContext 025{ 026 /** 027 * Returns true if the given system property is set. 028 */ 029 030 public boolean isPropertySet(String propertyName); 031 032 /** 033 * Returns true if the class, specified by FQCN, exists. 034 * 035 */ 036 037 public boolean doesClassExist(String className); 038}