src/main/java/org/apache/commons/jexl2/ObjectContext.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.jexl2;

/**
 * Wraps an Object as a Jexl context.
 * @param <T> the wrapped object type to use
 * @since 2.1
 */
public class ObjectContext<T> implements JexlContext {
    /** The property solving jexl engine. */
    private final JexlEngine jexl;
    /** The object serving as context provider. */
    final T object; // package access for use by test code

    /**
     * Creates a new ObjectContext.
     * @param engine the jexl engine to use to solve properties
     * @param wrapped the object to wrap in this context
     */
    public ObjectContext(JexlEngine engine, T wrapped) {
        this.jexl = engine;
        this.object = wrapped;
    }

    /** {@inheritDoc} */
    public Object get(String name) {
        return jexl.getProperty(object, name);
    }

    /** {@inheritDoc} */
    public void set(String name, Object value) {
        jexl.setProperty(object, name, value);
    }

    /** {@inheritDoc} */
    public boolean has(String name) {
        return jexl.getUberspect().getPropertyGet(object, name, null) != null;
    }
}