| /* |
| * 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 org.apache.oodt.profile.handlers.lightweight; |
| |
| import java.util.Set; |
| import java.util.Collections; |
| |
| /** |
| * A constant false result. |
| * |
| * This result never contains any matching elements. |
| * |
| * <p>Don't create elements of this object. Just use the {@link #INSTANCE} field, since |
| * only one is any program will ever need. |
| * |
| * @author Kelly |
| */ |
| class FalseResult implements Result { |
| /** |
| * Construct a false result. |
| */ |
| private FalseResult() {} |
| |
| /** The single false result any program will ever need. */ |
| public static final FalseResult INSTANCE = new FalseResult(); |
| |
| public String toString() { |
| return "falseResult"; |
| } |
| |
| public Set matchingElements() { |
| return Collections.EMPTY_SET; |
| } |
| } |