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 static org.apache.juneau.commons.utils.AssertionUtils.*;
020import static org.apache.juneau.commons.utils.Utils.*;
021
022import java.util.*;
023
024/**
025 * A subclass of {@link DefaultingVar} that simply pulls values from a {@link Map}.
026 *
027 * <h5 class='section'>See Also:</h5><ul>
028 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/SimpleVariableLanguageBasics">Simple Variable Language Basics</a>
029
030 * </ul>
031 */
032@SuppressWarnings("rawtypes")
033public abstract class MapVar extends DefaultingVar {
034
035   private final Map m;
036
037   /**
038    * Constructor.
039    *
040    * @param name The name of this variable.
041    * @param m The map to pull values from.
042    */
043   public MapVar(String name, Map m) {
044      super(name);
045      assertArgNotNull("m", m);
046      this.m = m;
047   }
048
049   @Override /* Overridden from Var */
050   public String resolve(VarResolverSession session, String varVal) {
051      return s(m.get(varVal));
052   }
053}