1:/*
  2: * @(#)ByteArrayDataSource.java   1.2 00/05/24
  3: *
  4: * Copyright 1998-2000 Sun Microsystems, Inc. All Rights Reserved.
  5: *
  6: * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
  7: * modify and redistribute this software in source and binary code form,
  8: * provided that i) this copyright notice and license appear on all copies of
  9: * the software; and ii) Licensee does not utilize the software in a manner
 10: * which is disparaging to Sun.
 11: *
 12: * This software is provided "AS IS," without a warranty of any kind. ALL
 13: * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 14: * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 15: * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 16: * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 17: * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 18: * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 19: * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 20: * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 21: * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 22: * POSSIBILITY OF SUCH DAMAGES.
 23: *
 24: * This software is not designed or intended for use in on-line control of
 25: * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 26: * the design, construction, operation or maintenance of any nuclear
 27: * facility. Licensee represents and warrants that it will not use or
 28: * redistribute the Software for such purposes.
 29: */
 30:
 31:import java.io.*;
 32:import javax.activation.*;
 33:
 34:/**
 35: * A simple DataSource for demonstration purposes.
 36: * This class implements a DataSource from:
 37: *    an InputStream
 38: *  a byte array
 39: *    a String
 40: *
 41: * @author John Mani
 42: * @author Bill Shannon
 43: * @author Max Spivak
 44: */
 45:public class ByteArrayDataSource implements DataSource {
 46:    private byte[] data;    // data
 47:    private String type;    // content-type
 48:
 49:    /* Create a DataSource from an input stream */
 50:    public ByteArrayDataSource(InputStream is, String type) {
 51:        this.type = type;
 52:        try { 
 53:            ByteArrayOutputStream os = new ByteArrayOutputStream();
 54:        int ch;
 55:
 56:        while ((ch = is.read()) != -1)
 57:                // XXX - must be made more efficient by
 58:            // doing buffered reads, rather than one byte reads
 59:            os.write(ch);
 60:        data = os.toByteArray();
 61:
 62:        } catch (IOException ioex) { }
 63:    }
 64:
 65:    /* Create a DataSource from a byte array */
 66:    public ByteArrayDataSource(byte[] data, String type) {
 67:        this.data = data;
 68:    this.type = type;
 69:    }
 70:
 71:    /* Create a DataSource from a String */
 72:    public ByteArrayDataSource(String data, String type) {
 73:    try {
 74:        // Assumption that the string contains only ASCII
 75:        // characters!  Otherwise just pass a charset into this
 76:        // constructor and use it in getBytes()
 77:        this.data = data.getBytes("iso-8859-1");
 78:    } catch (UnsupportedEncodingException uex) { }
 79:    this.type = type;
 80:    }
 81:
 82:    /**
 83:     * Return an InputStream for the data.
 84:     * Note - a new stream must be returned each time.
 85:     */
 86:    public InputStream getInputStream() throws IOException {
 87:    if (data == null)
 88:        throw new IOException("no data");
 89:    return new ByteArrayInputStream(data);
 90:    }
 91:
 92:    public OutputStream getOutputStream() throws IOException {
 93:    throw new IOException("cannot do this");
 94:    }
 95:
 96:    public String getContentType() {
 97:        return type;
 98:    }
 99:
100:    public String getName() {
101:        return "dummy";
102:    }
103:}