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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this version of the Tomahawk library.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.myfaces.converter;

import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.webapp.ConverterELTag;
import javax.servlet.jsp.JspException;

/**
 * Implementation of ConverterELTag
 * 
 * This is a copy of org.apache.myfaces.taglib.core.ConverterTag from 
 * myfaces core impl 1.2. This is copied here because we need a base class
 * where all custom converters must inherit.
 *  
 * @since 1.1.7
 * @author Bruno Aranda (latest modification by $Author: lu4242 $)
 * @version $Revision: 691871 $ $Date: 2008-09-03 23:32:08 -0500 (Wed, 03 Sep 2008) $
 */
public class ConverterTag extends ConverterELTag
{

    private static final long serialVersionUID = -4506829108081L;
    private ValueExpression _converterId;
    private ValueExpression _binding;
    private String _converterIdString = null;

    public ConverterTag()
    {
        super();
    }

    public void setConverterId(ValueExpression converterId)
    {
        _converterId = converterId;
    }

    public void setBinding(ValueExpression binding)
    {
        _binding = binding;
    }

    /**
     * Use this method to specify the converterId programmatically.
     *
     * @param converterIdString
     */
    public void setConverterIdString(String converterIdString)
    {
        _converterIdString = converterIdString;
    }

    public void release()
    {
        super.release();
        _converterId = null;
        _binding = null;
        _converterIdString = null;
    }

    protected Converter createConverter()
            throws JspException
    {
        Converter converter = null;

        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();

        // try to create the converter from the binding expression first, and then from
        // the converterId
        if (_binding != null)
        {
            try
            {
                converter = (Converter) _binding.getValue(elContext);

                if (converter != null)
                {
                    return converter;
                }
            }
            catch (Exception e)
            {
                throw new JspException("Exception creating converter using binding", e);
            }
        }

        if ((_converterId != null) || (_converterIdString != null))
        {
            try
            {
                if (null != _converterIdString)
                {
                    converter = facesContext.getApplication().createConverter(_converterIdString);
                } else 
                {
                    String converterId = (String) _converterId.getValue(elContext);
                    converter = facesContext.getApplication().createConverter(converterId);
                }

                // with binding no converter was created, set its value with the converter
                // created using the converterId
                if (converter != null && _binding != null)
                {
                    _binding.setValue(elContext, converter);
                }
            }
            catch (Exception e)
            {
                throw new JspException("Exception creating converter with converterId: " + _converterId, e);
            }
        }

        return converter;
    }

}