001// ***************************************************************************************************************************
002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file *
003// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
005// * with the License.  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 distributed under the License is distributed on an  *
010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the        *
011// * specific language governing permissions and limitations under the License.                                              *
012// ***************************************************************************************************************************
013package org.apache.juneau.svl;
014
015import static org.apache.juneau.internal.StringUtils.*;
016import static org.apache.juneau.internal.ThrowableUtils.*;
017
018import java.util.*;
019
020/**
021 * A subclass of {@link DefaultingVar} that simply pulls values from a {@link Map}.
022 *
023 * <ul class='seealso'>
024 *    <li class='link'>{@doc juneau-svl.SvlVariables}
025 * </ul>
026 */
027@SuppressWarnings("rawtypes")
028public abstract class MapVar extends DefaultingVar {
029
030   private final Map m;
031
032   /**
033    * Constructor.
034    *
035    * @param name The name of this variable.
036    * @param m The map to pull values from.
037    */
038   public MapVar(String name, Map m) {
039      super(name);
040      if (m == null)
041         illegalArg("''m'' parameter cannot be null.");
042      this.m = m;
043   }
044
045   @Override /* Var */
046   public String resolve(VarResolverSession session, String varVal) {
047      return stringify(m.get(varVal));
048   }
049}