com.jobs.lib_v1.net.http.multipart.Part.java Source code

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/**
 * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/methods/multipart/Part.java,v 1.16 2005/01/14 21:16:40 olegk Exp $
 * $Revision: 480424 $
 * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
 *
 * ====================================================================
 *
 *  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.
 * ====================================================================
 *
 * 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 com.jobs.lib_v1.net.http.multipart;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/***
 * Abstract class for one Part of a multipart post object.
 * 
 * @author <a href="mailto:mattalbright@yahoo.com">Matthew Albright</a>
 * @author <a href="mailto:jsdever@apache.org">Jeff Dever</a>
 * @author <a href="mailto:adrian@ephox.com">Adrian Sutton</a>
 * @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a>
 * @author <a href="mailto:oleg@ural.ru">Oleg Kalnichevski</a>
 * 
 * @since 2.0
 */
public abstract class Part {

    /***
     * The boundary
     * 
     * @deprecated use {@link org.apache.http.client.methods.multipart#MULTIPART_BOUNDARY}
     */
    protected static final String BOUNDARY = "----------------314159265358979323846";

    /***
     * The boundary as a byte array.
     * 
     * @deprecated
     */
    protected static final byte[] BOUNDARY_BYTES = BOUNDARY.getBytes();

    /***
     * The default boundary to be used if {@link #setPartBoundary(byte[])} has not been called.
     */
    private static final byte[] DEFAULT_BOUNDARY_BYTES = BOUNDARY_BYTES;

    /*** Carriage return/linefeed */
    protected static final String CRLF = "\r\n";

    /*** Carriage return/linefeed as a byte array */
    protected static final byte[] CRLF_BYTES = CRLF.getBytes();

    /*** Content dispostion characters */
    protected static final String QUOTE = "\"";

    /*** Content dispostion as a byte array */
    protected static final byte[] QUOTE_BYTES = QUOTE.getBytes();

    /*** Extra characters */
    protected static final String EXTRA = "--";

    /*** Extra characters as a byte array */
    protected static final byte[] EXTRA_BYTES = EXTRA.getBytes();

    /*** Content dispostion characters */
    protected static final String CONTENT_DISPOSITION = "Content-Disposition: form-data; name=";

    /*** Content dispostion as a byte array */
    protected static final byte[] CONTENT_DISPOSITION_BYTES = CONTENT_DISPOSITION.getBytes();

    /*** Content type header */
    protected static final String CONTENT_TYPE = "Content-Type: ";

    /*** Content type header as a byte array */
    protected static final byte[] CONTENT_TYPE_BYTES = CONTENT_TYPE.getBytes();

    /*** Content charset */
    protected static final String CHARSET = "; charset=";

    /*** Content charset as a byte array */
    protected static final byte[] CHARSET_BYTES = CHARSET.getBytes();

    /*** Content type header */
    protected static final String CONTENT_TRANSFER_ENCODING = "Content-Transfer-Encoding: ";

    /*** Content type header as a byte array */
    protected static final byte[] CONTENT_TRANSFER_ENCODING_BYTES = CONTENT_TRANSFER_ENCODING.getBytes();

    /***
     * Return the boundary string.
     * 
     * @return the boundary string
     * @deprecated uses a constant string. Rather use {@link #getPartBoundary}
     */
    public static String getBoundary() {
        return BOUNDARY;
    }

    /***
     * The ASCII bytes to use as the multipart boundary.
     */
    private byte[] boundaryBytes;

    /***
     * Return the name of this part.
     * 
     * @return The name.
     */
    public abstract String getName();

    /***
     * Returns the content type of this part.
     * 
     * @return the content type, or <code>null</code> to exclude the content type header
     */
    public abstract String getContentType();

    /***
     * Return the character encoding of this part.
     * 
     * @return the character encoding, or <code>null</code> to exclude the character encoding header
     */
    public abstract String getCharSet();

    /***
     * Return the transfer encoding of this part.
     * 
     * @return the transfer encoding, or <code>null</code> to exclude the transfer encoding header
     */
    public abstract String getTransferEncoding();

    /***
     * Gets the part boundary to be used.
     * 
     * @return the part boundary as an array of bytes.
     * 
     * @since 3.0
     */
    protected byte[] getPartBoundary() {
        if (boundaryBytes == null) {
            // custom boundary bytes have not been set, use the default.
            return DEFAULT_BOUNDARY_BYTES;
        } else {
            return boundaryBytes;
        }
    }

    /***
     * Sets the part boundary. Only meant to be used by {@link Part#sendParts(OutputStream, Part[], byte[])} and {@link Part#getLengthOfParts(Part[], byte[])}
     * 
     * @param boundaryBytes An array of ASCII bytes.
     * @since 3.0
     */
    void setPartBoundary(byte[] boundaryBytes) {
        this.boundaryBytes = boundaryBytes;
    }

    /***
     * Tests if this part can be sent more than once.
     * 
     * @return <code>true</code> if {@link #sendData(OutputStream)} can be successfully called more than once.
     * @since 3.0
     */
    public boolean isRepeatable() {
        return true;
    }

    /***
     * Write the start to the specified output stream
     * 
     * @param out The output stream
     * @throws IOException If an IO problem occurs.
     */
    protected void sendStart(OutputStream out) throws IOException {
        out.write(EXTRA_BYTES);
        out.write(getPartBoundary());
        out.write(CRLF_BYTES);
    }

    /***
     * Write the content disposition header to the specified output stream
     * 
     * @param out The output stream
     * @throws IOException If an IO problem occurs.
     */
    protected void sendDispositionHeader(OutputStream out) throws IOException {
        out.write(CONTENT_DISPOSITION_BYTES);
        out.write(QUOTE_BYTES);
        out.write(getName().getBytes());
        out.write(QUOTE_BYTES);
    }

    /***
     * Write the content type header to the specified output stream
     * 
     * @param out The output stream
     * @throws IOException If an IO problem occurs.
     */
    protected void sendContentTypeHeader(OutputStream out) throws IOException {
        String contentType = getContentType();
        if (contentType != null) {
            out.write(CRLF_BYTES);
            out.write(CONTENT_TYPE_BYTES);
            out.write(contentType.getBytes());

            String charSet = getCharSet();

            if (charSet != null) {
                out.write(CHARSET_BYTES);
                out.write(charSet.getBytes());
            }
        }
    }

    /***
     * Write the content transfer encoding header to the specified output stream
     * 
     * @param out The output stream
     * @throws IOException If an IO problem occurs.
     */
    protected void sendTransferEncodingHeader(OutputStream out) throws IOException {
        String transferEncoding = getTransferEncoding();
        if (transferEncoding != null) {
            out.write(CRLF_BYTES);
            out.write(CONTENT_TRANSFER_ENCODING_BYTES);
            out.write(transferEncoding.getBytes());
        }
    }

    /***
     * Write the end of the header to the output stream
     * 
     * @param out The output stream
     * @throws IOException If an IO problem occurs.
     */
    protected void sendEndOfHeader(OutputStream out) throws IOException {
        out.write(CRLF_BYTES);
        out.write(CRLF_BYTES);
    }

    /***
     * Write the data to the specified output stream
     * 
     * @param out The output stream
     * @throws IOException If an IO problem occurs.
     */
    protected abstract void sendData(OutputStream out) throws IOException;

    /***
     * Return the length of the main content
     * 
     * @return long The length.
     * @throws IOException If an IO problem occurs
     */
    protected abstract long lengthOfData() throws IOException;

    /***
     * Write the end data to the output stream.
     * 
     * @param out The output stream
     * @throws IOException If an IO problem occurs.
     */
    protected void sendEnd(OutputStream out) throws IOException {
        out.write(CRLF_BYTES);
    }

    /***
     * Write all the data to the output stream. If you override this method make sure to override #length() as well
     * 
     * @param out The output stream
     * @throws IOException If an IO problem occurs.
     */
    public void send(OutputStream out) throws IOException {
        sendStart(out);
        sendDispositionHeader(out);
        sendContentTypeHeader(out);
        sendTransferEncodingHeader(out);
        sendEndOfHeader(out);
        sendData(out);
        sendEnd(out);
    }

    /***
     * Return the full length of all the data. If you override this method make sure to override #send(OutputStream) as well
     * 
     * @return long The length.
     * @throws IOException If an IO problem occurs
     */
    public long length() throws IOException {
        if (lengthOfData() < 0) {
            return -1;
        }

        ByteArrayOutputStream overhead = new ByteArrayOutputStream();
        sendStart(overhead);
        sendDispositionHeader(overhead);
        sendContentTypeHeader(overhead);
        sendTransferEncodingHeader(overhead);
        sendEndOfHeader(overhead);
        sendEnd(overhead);

        return overhead.size() + lengthOfData();
    }

    /***
     * Return a string representation of this object.
     * 
     * @return A string representation of this object.
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return this.getName();
    }

    /***
     * Write all parts and the last boundary to the specified output stream.
     * 
     * @param out The stream to write to.
     * @param parts The parts to write.
     * 
     * @throws IOException If an I/O error occurs while writing the parts.
     */
    public static void sendParts(OutputStream out, final Part[] parts) throws IOException {
        sendParts(out, parts, DEFAULT_BOUNDARY_BYTES);
    }

    /***
     * Write all parts and the last boundary to the specified output stream.
     * 
     * @param out The stream to write to.
     * @param parts The parts to write.
     * @param partBoundary The ASCII bytes to use as the part boundary.
     * 
     * @throws IOException If an I/O error occurs while writing the parts.
     * 
     * @since 3.0
     */
    public static void sendParts(OutputStream out, Part[] parts, byte[] partBoundary) throws IOException {
        if (parts == null) {
            throw new IllegalArgumentException("Parts may not be null");
        }

        if (partBoundary == null || partBoundary.length == 0) {
            throw new IllegalArgumentException("partBoundary may not be empty");
        }

        for (int i = 0; i < parts.length; i++) {
            // set the part boundary before the part is sent
            parts[i].setPartBoundary(partBoundary);
            parts[i].send(out);
        }

        out.write(EXTRA_BYTES);
        out.write(partBoundary);
        out.write(EXTRA_BYTES);
        out.write(CRLF_BYTES);
    }

    /***
     * Return the total sum of all parts and that of the last boundary
     * 
     * @param parts The parts.
     * @return The total length
     * 
     * @throws IOException If an I/O error occurs while writing the parts.
     */
    public static long getLengthOfParts(Part[] parts) throws IOException {
        return getLengthOfParts(parts, DEFAULT_BOUNDARY_BYTES);
    }

    /***
     * Gets the length of the multipart message including the given parts.
     * 
     * @param parts The parts.
     * @param partBoundary The ASCII bytes to use as the part boundary.
     * @return The total length
     * 
     * @throws IOException If an I/O error occurs while writing the parts.
     * 
     * @since 3.0
     */
    public static long getLengthOfParts(Part[] parts, byte[] partBoundary) throws IOException {
        if (parts == null) {
            throw new IllegalArgumentException("Parts may not be null");
        }

        long total = 0;
        for (int i = 0; i < parts.length; i++) {
            // set the part boundary before we calculate the part's length
            parts[i].setPartBoundary(partBoundary);
            long l = parts[i].length();
            if (l < 0) {
                return -1;
            }
            total += l;
        }

        total += EXTRA_BYTES.length;
        total += partBoundary.length;
        total += EXTRA_BYTES.length;
        total += CRLF_BYTES.length;

        return total;
    }
}