/*
 * $Header: /home/cvs/jakarta-commons/fileupload/src/java/org/apache/commons/fileupload/DefaultFileItemFactory.java,v 1.2 2003/05/31 22:31:08 martinc Exp $
 * $Revision: 1.2 $
 * $Date: 2003/05/31 22:31:08 $
 *
 * ====================================================================
 *
 * 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 acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * 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/>.
 *
 */


package org.apache.commons.fileupload;

import java.io.File;


/**
 * <p>The default {@link org.apache.commons.fileupload.FileItemFactory}
 * implementation. This implementation creates
 * {@link org.apache.commons.fileupload.FileItem} instances which keep their
 * content either in memory, for smaller items, or in a temporary file on disk,
 * for larger items. The size threshold, above which content will be stored on
 * disk, is configurable, as is the directory in which temporary files will be
 * created.</p>
 *
 * <p>If not otherwise configured, the default configuration values are as
 * follows:
 * <ul>
 *   <li>Size threshold is 10KB.</li>
 *   <li>Repository is the system default temp directory, as returned by
 *       <code>System.getProperty("java.io.tmpdir")</code>.</li>
 * </ul>
 * </p>
 *
 * @author <a href="mailto:martinc@apache.org">Martin Cooper</a>
 *
 * @version $Id: DefaultFileItemFactory.java,v 1.2 2003/05/31 22:31:08 martinc Exp $
 */
public class DefaultFileItemFactory implements FileItemFactory
{

    // ----------------------------------------------------- Manifest constants


    /**
     * The default threshold above which uploads will be stored on disk.
     */
    public static final int DEFAULT_SIZE_THRESHOLD = 10240;


    // ----------------------------------------------------- Instance Variables


    /**
     * The directory in which uploaded files will be stored, if stored on disk.
     */
    private File repository;


    /**
     * The threshold above which uploads will be stored on disk.
     */
    private int sizeThreshold = DEFAULT_SIZE_THRESHOLD;


    // ----------------------------------------------------------- Constructors


    /**
     * Constructs an unconfigured instance of this class. The resulting factory
     * may be configured by calling the appropriate setter methods.
     */
    public DefaultFileItemFactory()
    {
    }


    /**
     * Constructs a preconfigured instance of this class.
     *
     * @param sizeThreshold The threshold, in bytes, below which items will be
     *                      retained in memory and above which they will be
     *                      stored as a file.
     * @param repository    The data repository, which is the directory in
     *                      which files will be created, should the item size
     *                      exceed the threshold.
     */
    public DefaultFileItemFactory(int sizeThreshold, File repository)
    {
        this.sizeThreshold = sizeThreshold;
        this.repository = repository;
    }


    // ------------------------------------------------------------- Properties


    /**
     * Returns the directory used to temporarily store files that are larger
     * than the configured size threshold.
     *
     * @return The directory in which temporary files will be located.
     *
     * @see #setRepository(java.io.File)
     *
     */
    public File getRepository()
    {
        return repository;
    }


    /**
     * Sets the directory used to temporarily store files that are larger
     * than the configured size threshold.
     *
     * @param repository The directory in which temporary files will be located.
     *
     * @see #getRepository()
     *
     */
    public void setRepository(File repository)
    {
        this.repository = repository;
    }


    /**
     * Returns the size threshold beyond which files are written directly to
     * disk. The default value is 1024 bytes.
     *
     * @return The size threshold, in bytes.
     *
     * @see #setSizeThreshold(int)
     */
    public int getSizeThreshold()
    {
        return sizeThreshold;
    }


    /**
     * Sets the size threshold beyond which files are written directly to disk.
     *
     * @param sizeThreshold The size threshold, in bytes.
     *
     * @see #getSizeThreshold()
     *
     */
    public void setSizeThreshold(int sizeThreshold)
    {
        this.sizeThreshold = sizeThreshold;
    }


    // --------------------------------------------------------- Public Methods

    /**
     * Create a new {@link org.apache.commons.fileupload.DefaultFileItem}
     * instance from the supplied parameters and the local factory
     * configuration.
     *
     * @param fieldName   The name of the form field.
     * @param contentType The content type of the form field.
     * @param isFormField <code>true</code> if this is a plain form field;
     *                    <code>false</code> otherwise.
     * @param fileName    The name of the uploaded file, if any, as supplied
     *                    by the browser or other client.
     *
     * @return The newly created file item.
     */
    public FileItem createItem(
            String fieldName,
            String contentType,
            boolean isFormField,
            String fileName
            )
    {
        return new DefaultFileItem(fieldName, contentType,
                isFormField, fileName, sizeThreshold, repository);
    }

}