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Groovy example source code file (ClosureModel.java)

This example Groovy source code file (ClosureModel.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

class, closure, closure, closuremodel, closuremodel, nestedvaluemodel, object, object, valuemodel, valuemodel

The Groovy ClosureModel.java source code

/*
 * 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 groovy.lang.Closure;

/**
 * Represents a value model using a closure to extract
 * the value from some source model and an optional write closure
 * for updating the value.
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 7922 $
 */
public class ClosureModel implements ValueModel, NestedValueModel {

    private final ValueModel sourceModel;
    private final Closure readClosure;
    private final Closure writeClosure;
    private final Class type;

    public ClosureModel(ValueModel sourceModel, Closure readClosure) {
        this(sourceModel, readClosure, null);
    }

    public ClosureModel(ValueModel sourceModel, Closure readClosure, Closure writeClosure) {
        this(sourceModel, readClosure, writeClosure, Object.class);
    }

    public ClosureModel(ValueModel sourceModel, Closure readClosure, Closure writeClosure, Class type) {
        this.sourceModel = sourceModel;
        this.readClosure = readClosure;
        this.writeClosure = writeClosure;
        this.type = type;
    }

    public ValueModel getSourceModel() {
        return sourceModel;
    }

    public Object getValue() {
        Object source = sourceModel.getValue();
        if (source != null) {
            return readClosure.call(source);
        }
        return null;
    }

    public void setValue(Object value) {
        if (writeClosure != null) {
            Object source = sourceModel.getValue();
            if (source != null) {
                writeClosure.call(new Object[] { source, value });
            }
        }
    }

    public Class getType() {
        return type;
    }

    public boolean isEditable() {
        return writeClosure != null;
    }
}

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