001    /*
002     * Copyright 2002-2005 the original author or authors.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005     * use this file except in compliance with the License. You may obtain a copy of
006     * the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013     * License for the specific language governing permissions and limitations under
014     * the License.
015     */
016    package org.springframework.binding.value;
017    
018    /**
019     * A value model that derives its value by applying some transformation to one
020     * or more source value models.
021     *
022     * <p>
023     * Typical usage would be a type converter or string formatter.
024     *
025     * @author Oliver Hutchison
026     */
027    public interface DerivedValueModel extends ValueModel {
028    
029            /**
030             * Returns an array of all values models that are used to derive the value
031             * represented by this value model.
032             */
033            ValueModel[] getSourceValueModels();
034    
035            /**
036             * Returns true if the implementation does not support calls setValue.
037             */
038            boolean isReadOnly();
039    }