/*****************************************************************
 *   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.cayenne.exp.parser;

import java.io.IOException;
import java.util.List;

import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.DataObject;
import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.map.Entity;
import org.apache.cayenne.map.ObjEntity;
import org.apache.cayenne.reflect.PropertyUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ASTObjPath extends ASTPath {

	private static final long serialVersionUID = -3574281576491705706L;

	private static final Logger LOGGER = LoggerFactory.getLogger(ASTObjPath.class);

	public static final String OBJ_PREFIX = "obj:";

	/**
	 * Constructor used by expression parser. Do not invoke directly.
	 */
	ASTObjPath(int id) {
		super(id);
	}

	public ASTObjPath() {
		super(ExpressionParserTreeConstants.JJTOBJPATH);
	}

	public ASTObjPath(Object value) {
		super(ExpressionParserTreeConstants.JJTOBJPATH);
		setPath(value);
	}

	@Override
	protected Object evaluateNode(Object o) throws Exception {
		return (o instanceof DataObject) ? ((DataObject) o).readNestedProperty(path)
				: (o instanceof Entity) ? evaluateEntityNode((Entity) o) : PropertyUtils.getProperty(o, path);
	}

	/**
	 * Creates a copy of this expression node, without copying children.
	 */
	@Override
	public Expression shallowCopy() {
		ASTObjPath copy = new ASTObjPath(id);
		copy.path = path;
		return copy;
	}

	/**
	 * @since 4.0
	 */
	@Override
	public void appendAsEJBQL(List<Object> parameterAccumulator, Appendable out, String rootId) throws IOException {
		out.append(rootId);
		out.append('.');
		out.append(path);
	}

	/**
	 * @since 4.0
	 */
	@Override
	public void appendAsString(Appendable out) throws IOException {
		out.append(path);
	}

	@Override
	public int getType() {
		return Expression.OBJ_PATH;
	}

	void injectValue(Object source, Object value) {
		if (!getPath().contains(ObjEntity.PATH_SEPARATOR)) {
			try {
				if (source instanceof DataObject) {
					((DataObject) source).writeProperty(getPath(), value);
				} else {
					PropertyUtils.setProperty(source, getPath(), value);
				}
			} catch (CayenneRuntimeException ex) {
				LOGGER.warn("Failed to inject value " + value + " on path " + getPath() + " to " + source, ex);
			}
		}
	}
}