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     */
017    package org.apache.commons.jexl2;
018    
019    /**
020     * Wraps an Object as a Jexl context.
021     * @param <T> the wrapped object type to use
022     * @since 2.1
023     */
024    public class ObjectContext<T> implements JexlContext {
025        /** The property solving jexl engine. */
026        private final JexlEngine jexl;
027        /** The object serving as context provider. */
028        private final T object;
029    
030        /**
031         * Creates a new ObjectContext.
032         * @param engine the jexl engine to use to solve properties
033         * @param wrapped the object to wrap in this context
034         */
035        public ObjectContext(JexlEngine engine, T wrapped) {
036            this.jexl = engine;
037            this.object = wrapped;
038        }
039    
040        /** {@inheritDoc} */
041        public Object get(String name) {
042            return jexl.getProperty(object, name);
043        }
044    
045        /** {@inheritDoc} */
046        public void set(String name, Object value) {
047            jexl.setProperty(object, name, value);
048        }
049    
050        /** {@inheritDoc} */
051        public boolean has(String name) {
052            return jexl.getUberspect().getPropertyGet(object, name, null) != null;
053        }
054    }