package org.apache.turbine.services.intake.model;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache Turbine" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
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 *
 * 5. Products derived from this software may not be called "Apache",
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import org.apache.commons.lang.StringUtils;

import org.apache.turbine.services.intake.IntakeException;
import org.apache.turbine.services.intake.validator.DoubleValidator;
import org.apache.turbine.services.intake.xmlmodel.XmlField;

/**
 * Creates Double Field objects.
 *
 * @deprecated Use the Fulcrum Intake component instead.
 * @version $Id$
 */
public class DoubleField
        extends Field
{
    /**
     * Constructor.
     *
     * @param field xml field definition object
     * @param group xml group definition object
     * @throws IntakeException thrown by superclass
     */
    public DoubleField(XmlField field, Group group)
            throws IntakeException
    {
        super(field, group);
    }

    /**
     * Sets the default value for a Double Field
     *
     * @param prop Parameter for the default values
     */
    public void setDefaultValue(String prop)
    {
        defaultValue = null;

        if (prop == null)
        {
            return;
        }

        defaultValue = new Double(prop);
    }

    /**
     * Set the empty Value. This value is used if Intake
     * maps a field to a parameter returned by the user and
     * the corresponding field is either empty (empty string)
     * or non-existant.
     *
     * @param prop The value to use if the field is empty.
     */
    public void setEmptyValue(String prop)
    {
        emptyValue = null;

        if (prop == null)
        {
            return;
        }

        emptyValue = new Double(prop);
    }

    /**
     * Provides access to emptyValue such that the value returned will be 
     * acceptable as an argument parameter to Method.invoke.  Subclasses
     * that deal with primitive types should ensure that they return an 
     * appropriate value wrapped in the object wrapper class for the 
     * primitive type.
     *   
     * @return the value to use when the field is empty or an Object that
     * wraps the empty value for primitive types.
     */
    protected Object getSafeEmptyValue()
    {
        if (isMultiValued)
        {
            return new double[0];
        }
        else
        {
            return (null == getEmptyValue()) 
                    ? new Double(0.0) : getEmptyValue();
        }
    }

    /**
     * A suitable validator.
     *
     * @return A suitable validator
     */
    protected String getDefaultValidator()
    {
        return DoubleValidator.class.getName();
    }

    /**
     * Sets the value of the field from data in the parser.
     */
    protected void doSetValue()
    {
        if (isMultiValued)
        {
            String[] inputs = parser.getStrings(getKey());
            double[] values = new double[inputs.length];
            for (int i = 0; i < inputs.length; i++)
            {
                values[i] = StringUtils.isNotEmpty(inputs[i])
                        ? new Double(inputs[i]).doubleValue() 
                        : ((Double) getEmptyValue()).doubleValue();
            }
            setTestValue(values);
        }
        else
        {
            String val = parser.getString(getKey());
            setTestValue(StringUtils.isNotEmpty(val) 
                    ? new Double(val) : (Double) getEmptyValue());
        }
    }
    
}