001    package org.apache.commons.ognl;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *   http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    import java.lang.reflect.Member;
023    import java.util.Map;
024    
025    /**
026     * Interface for accessing the type conversion facilities within a context.
027     *
028     * @author Luke Blanshard (blanshlu@netscape.net)
029     * @author Drew Davidson (drew@ognl.org)
030     */
031    public interface TypeConverter
032    {
033    
034        /**
035         * Converts the given value to a given type. The OGNL context, target, member and name of property being set are
036         * given. This method should be able to handle conversion in general without any context, target, member or property
037         * name specified.
038         *
039         * @param context      OGNL context under which the conversion is being done
040         * @param target       target object in which the property is being set
041         * @param member       member (Constructor, Method or Field) being set
042         * @param propertyName property name being set
043         * @param value        value to be converted
044         * @param toType       type to which value is converted
045         * @return Converted value of type toType or TypeConverter.NoConversionPossible to indicate that the conversion was
046         *         not possible.
047         */
048        <T> T convertValue( Map<String, Object> context, Object target, Member member, String propertyName, Object value,
049                            Class<T> toType );
050    
051    }