valuebindingpropertyeditor.java

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/*
 * Copyright 2002-2004 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 de.mindmatters.faces.el;

import java.beans.PropertyEditorSupport;

import javax.faces.FactoryFinder;
import javax.faces.application.Application;
import javax.faces.application.ApplicationFactory;
import javax.faces.el.ValueBinding;

import org.springframework.util.Assert;

/**
 * Editor for {@link ValueBinding}, to directly populate a ValueBinding
 * property.
 * 
 * @author Andreas Kuhrwahl
 * 
 */
public class ValueBindingPropertyEditor extends PropertyEditorSupport {

    /** The Application of the underlying JSF implementation. */
    private final Application application;

    /**
     * Standard constructor.
     */
    public ValueBindingPropertyEditor() {
        this(((ApplicationFactory) FactoryFinder
                .getFactory(FactoryFinder.APPLICATION_FACTORY))
                .getApplication());
    }

    /**
     * Creates a ValueBindingPropertyEditor with the given {@link Application}.
     * 
     * @param application
     *            the Application of the underlying JSF implementation
     */
    public ValueBindingPropertyEditor(final Application application) {
        super();
        Assert.notNull(application);
        this.application = application;
    }

    /**
     * {@inheritDoc}
     */
    public void setAsText(final String text) {
        try {
            setValue(this.application.createValueBinding(text));
        } catch (Exception ex) {
            throw new IllegalArgumentException(ex.getMessage());
        }
    }

    /**
     * {@inheritDoc}
     */
    public String getAsText() {
        ValueBinding vb = (ValueBinding) getValue();
        String result = "";
        if (vb != null) {
            result = vb.getExpressionString();
        }
        return result;
    }

}