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 * <h5 class='section'>See Also:</h5>
024 * <ul>
025 *    <li class='link'>{@doc juneau-svl.SvlVariables}
026 * </ul>
027 */
028@SuppressWarnings("rawtypes")
029public abstract class MapVar extends DefaultingVar {
030
031   private final Map m;
032
033   /**
034    * Constructor.
035    *
036    * @param name The name of this variable.
037    * @param m The map to pull values from.
038    */
039   public MapVar(String name, Map m) {
040      super(name);
041      if (m == null)
042         illegalArg("''m'' parameter cannot be null.");
043      this.m = m;
044   }
045
046   @Override /* Var */
047   public String resolve(VarResolverSession session, String varVal) {
048      return asString(m.get(varVal));
049   }
050}