001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.svl;
018
019import java.util.*;
020
021import org.apache.juneau.common.utils.*;
022
023/**
024 * A subclass of {@link DefaultingVar} that simply pulls values from a {@link Map}.
025 *
026 * <h5 class='section'>See Also:</h5><ul>
027 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/SimpleVariableLanguageBasics">Simple Variable Language Basics</a>
028
029 * </ul>
030 */
031@SuppressWarnings("rawtypes")
032public abstract class MapVar extends DefaultingVar {
033
034   private final Map m;
035
036   /**
037    * Constructor.
038    *
039    * @param name The name of this variable.
040    * @param m The map to pull values from.
041    */
042   public MapVar(String name, Map m) {
043      super(name);
044      Utils.assertArgNotNull("m", m);
045      this.m = m;
046   }
047
048   @Override /* Var */
049   public String resolve(VarResolverSession session, String varVal) {
050      return Utils.s(m.get(varVal));
051   }
052}