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Groovy: A powerful, dynamic language for the JVM

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/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed 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 groovy.model;

import org.codehaus.groovy.runtime.InvokerHelper;

/**
 * Represents a property of a value as a model.
 * 
 * @author James Strachan
 * @version $Revision: 7054 $
 */
public class PropertyModel implements ValueModel, NestedValueModel {

    private ValueModel sourceModel;
    private String property;
    private Class type;
    boolean editable;

    public PropertyModel(ValueModel sourceModel, String property) {
        this(sourceModel, property, Object.class, true);
    }

    public PropertyModel(ValueModel sourceModel, String property, Class type) {
        this(sourceModel, property, type, true);
    }

    public PropertyModel(ValueModel sourceModel, String property, Class type, boolean editable) {
        this.sourceModel = sourceModel;
        this.property = property;
        this.type = type;
        //TODO After 1.1 we should introspect the meta property and set editable to false if the property is read only
        this.editable = editable;
    }

    public String getProperty() {
        return property;
    }

    public ValueModel getSourceModel() {
        return sourceModel;
    }

    public Object getValue() {
        Object source = sourceModel.getValue();
        if (source != null) {
            return InvokerHelper.getProperty(source, property);
        }
        return null;
    }

    public void setValue(Object value) {
        Object source = sourceModel.getValue();
        if (source != null) {
            InvokerHelper.setProperty(source, property, value);
        }
    }
    
    public Class getType() {
        return type;
    }

    public boolean isEditable() {
        return editable;
    }

}