elresolverfactorybean.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.spring.factory;

import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;

import org.springframework.beans.FatalBeanException;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.util.Assert;

/**
 * {@link FactoryBean} resolving JSF EL value expressions.
 * 
 * @author Andreas Kuhrwahl
 */
public final class ELResolverFactoryBean implements FactoryBean {

    /** The {@link ValueBinding} representing the given expression. */
    private final ValueBinding valueBinding;

    /** The type of the object. */
    private final Class objectType;

    /**
     * Default constructor.
     * 
     * @param expression
     *            the el expression
     * @throws FatalBeanException
     *             in case of errors
     */
    public ELResolverFactoryBean(final String expression) {
        Assert.notNull(expression);
        try {
            FacesContext context = FacesContext.getCurrentInstance();
            this.valueBinding = context.getApplication().createValueBinding(
                    expression);
            Class resolvedObjectType = this.valueBinding.getType(context);
            if (FactoryBean.class.isAssignableFrom(resolvedObjectType)) {
                resolvedObjectType = Object.class;
            }
            this.objectType = resolvedObjectType;
        } catch (Throwable ex) {
            throw new FatalBeanException(ex.getMessage(), ex);
        }
    }

    /**
     * {@inheritDoc}
     */
    public Object getObject() throws Exception {
        return this.valueBinding.getValue(FacesContext.getCurrentInstance());
    }

    /**
     * {@inheritDoc}
     */
    public Class getObjectType() {
        return this.objectType;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isSingleton() {
        return false;
    }

}