1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.commons.jexl3; 19 20 import java.util.HashMap; 21 import java.util.Map; 22 23 /** 24 * Wraps a map in a context. 25 * <p>Each entry in the map is considered a variable name, value pair.</p> 26 */ 27 public class MapContext implements JexlContext { 28 29 /** 30 * The wrapped variable map. 31 */ 32 private final Map<String, Object> map; 33 34 /** 35 * Creates a MapContext on an automatically allocated underlying HashMap. 36 */ 37 public MapContext() { 38 this(null); 39 } 40 41 /** 42 * Creates a MapContext wrapping an existing user provided map. 43 * 44 * @param vars the variable map 45 */ 46 public MapContext(final Map<String, Object> vars) { 47 map = vars == null ? new HashMap<>() : vars; 48 } 49 50 @Override 51 public boolean has(final String name) { 52 return map.containsKey(name); 53 } 54 55 @Override 56 public Object get(final String name) { 57 return map.get(name); 58 } 59 60 @Override 61 public void set(final String name, final Object value) { 62 map.put(name, value); 63 } 64 65 /** 66 * Clears all variables. 67 */ 68 public void clear() { 69 map.clear(); 70 } 71 }