Examples of org.apache.james.mime4j.parser.MimeStreamParser

org.apache.james.mime4j.parser.MimeStreamParser
Parses MIME (or RFC822) message streams of bytes or characters and reports parsing events to a ContentHandler instance.

Typical usage:
```
 ContentHandler handler = new MyHandler(); MimeStreamParser parser = new MimeStreamParser(); parser.setContentHandler(handler); parser.parse(new FileInputStream("mime.msg")); 
```
@version $Id: MimeStreamParser.java,v 1.8 2005/02/11 10:12:02 ntherning Exp $

        // Get the mime4j configuration, or use a default one
        MimeConfig config = new MimeConfig();
        config.setMaxLineLen(10000); // max length of any individual header
        config = context.get(MimeConfig.class, config);


        MimeStreamParser parser = new MimeStreamParser(config);
        XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);


        MailContentHandler mch = new MailContentHandler(
                xhtml, metadata, config.isStrictParsing());
        parser.setContentHandler(mch);
        parser.setContentDecoding(true);
        TaggedInputStream tagged = TaggedInputStream.get(stream);
        try {
            parser.parse(tagged);
        } catch (IOException e) {
            tagged.throwIfCauseOf(e);
            throw new TikaException("Failed to parse an email message", e);
        } catch (MimeException e) {
            // Unwrap the exception in case it was not thrown by mime4j

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     * 
     * @param is the stream to parse.
     * @throws IOException on I/O errors.
     */
    public Message(InputStream is) throws IOException {
        MimeStreamParser parser = new MimeStreamParser();
        parser.setContentHandler(new MessageBuilder());
        try {
            parser.parse(is);
        } catch (MimeException e) {
            IllegalStateException ise = new IllegalStateException(
                    "Unexpected message processing error");
            ise.initCause(e);
            throw ise;

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        ByteArrayInputStream bais = new ByteArrayInputStream(sb.toString().getBytes("US-ASCII"));
        
        final StringBuffer actual = new StringBuffer();
        
        MimeStreamParser parser = new MimeStreamParser();
        parser.setContentHandler(new AbstractContentHandler() {
            public void epilogue(InputStream is) throws IOException {
                int b;
                while ((b = is.read()) != -1) {
                    actual.append((char) b);
                }
            }
        });
        parser.parse(bais);
        
        assertEquals(epilogue.toString(), actual.toString());
    }

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        expected.add("From: foo@abr.com");
        sb.append(expected.getLast().toString() + "\r\n");
        expected.add("Subject: A subject");
        sb.append(expected.getLast().toString() + "\r\n");
        
        MimeStreamParser parser = new MimeStreamParser();
        parser.setContentHandler(new AbstractContentHandler() {
            public void field(String fieldData) {
                assertEquals((String) expected.removeFirst(), fieldData);
            }
        });
        
        parser.parse(new ByteArrayInputStream(sb.toString().getBytes()));
        
        assertEquals(0, expected.size());
    }

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        final LinkedList expected = new LinkedList();
        expected.add("The-field: This field\r\rcontains CR:s\r\r"
                        + "not\r\n\tfollowed by LF");
        sb.append(expected.getLast().toString() + "\r\n");
        
        MimeStreamParser parser = new MimeStreamParser();
        parser.setContentHandler(new AbstractContentHandler() {
            public void field(String fieldData) {
                assertEquals((String) expected.removeFirst(), fieldData);
            }
        });
        
        parser.parse(new ByteArrayInputStream(sb.toString().getBytes()));
        
        assertEquals(0, expected.size());
    }

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                        + " Wed, 19 Jun 96 18:12 MES");
        sb.append(expected.getLast().toString() + "\r\n");
        expected.add("Subject: A folded subject\r\n Line 2\r\n\tLine 3");
        sb.append(expected.getLast().toString() + "\r\n");
        
        MimeStreamParser parser = new MimeStreamParser();
        parser.setContentHandler(new AbstractContentHandler() {
            public void field(String fieldData) {
                assertEquals((String) expected.removeFirst(), fieldData);
            }
        });
        
        parser.parse(new ByteArrayInputStream(sb.toString().getBytes()));
        
        assertEquals(0, expected.size());
    }

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        assertEquals(0, expected.size());
    }
    
    public void testStop() throws Exception {
        final MimeStreamParser parser = new MimeStreamParser();
        TestHandler handler = new TestHandler() {
            public void endHeader() {
                super.endHeader();
                parser.stop();
            }
        };
        parser.setContentHandler(handler);


        String msg = "Subject: Yada yada\r\n"
                   + "From: foo@bar.com\r\n"
                   + "\r\n"
                   + "Line 1\r\n"
                   + "Line 2\r\n";
        String expected = "<message>\r\n"
                        + "<header>\r\n"
                        + "<field>\r\n"
                        + "Subject: Yada yada"
                        + "</field>\r\n"
                        + "<field>\r\n"
                        + "From: foo@bar.com"
                        + "</field>\r\n"
                        + "</header>\r\n"
                        + "<body>\r\n"
                        + "</body>\r\n"
                        + "</message>\r\n";
        
        parser.parse(new ByteArrayInputStream(msg.getBytes()));
        String result = handler.sb.toString();
        
        assertEquals(expected, result);
    }

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        sb.append(expected.getLast().toString() + "\r\n");
        expected.add("Subject: A subject");
        sb.append(expected.getLast().toString() + "\r\n");
        sb.append("A line which should be ignored\r\n");
        
        MimeStreamParser parser = new MimeStreamParser();
        parser.setContentHandler(new AbstractContentHandler() {
            public void field(String fieldData) {
                assertEquals((String) expected.removeFirst(), fieldData);
            }
        });
        
        parser.parse(new ByteArrayInputStream(sb.toString().getBytes()));
        
        assertEquals(0, expected.size());
    }

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        expected.add("startHeader");
        expected.add("endHeader");
        expected.add("body");
        expected.add("endMessage");
        
        MimeStreamParser parser = new MimeStreamParser();
        parser.setContentHandler(new AbstractContentHandler() {
            public void body(BodyDescriptor bd, InputStream is) {
                assertEquals((String) expected.removeFirst(), "body");
            }
            
            public void endMultipart() {
                fail("endMultipart shouldn't be called for empty stream");
            }


            public void endBodyPart() {
                fail("endBodyPart shouldn't be called for empty stream");
            }


            public void endHeader() {
                assertEquals((String) expected.removeFirst(), "endHeader");
            }


            public void endMessage() {
                assertEquals((String) expected.removeFirst(), "endMessage");
            }


            public void field(String fieldData) {
                fail("field shouldn't be called for empty stream");
            }


            public void startMultipart(BodyDescriptor bd) {
                fail("startMultipart shouldn't be called for empty stream");
            }


            public void startBodyPart() {
                fail("startBodyPart shouldn't be called for empty stream");
            }


            public void startHeader() {
                assertEquals((String) expected.removeFirst(), "startHeader");
            }


            public void startMessage() {
                assertEquals((String) expected.removeFirst(), "startMessage");
            }
        });
        
        parser.parse(new ByteArrayInputStream(new byte[0]));
        
        assertEquals(0, expected.size());
    }

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        sb.append("\r\n");
        sb.append("The body is right here\r\n");
        
        final StringBuffer body = new StringBuffer();
        
        MimeStreamParser parser = new MimeStreamParser();
        parser.setContentHandler(new AbstractContentHandler() {
            public void field(String fieldData) {
                fail("No fields should be reported");
            }
            public void body(BodyDescriptor bd, InputStream is) throws IOException {
                int b;
                while ((b = is.read()) != -1) {
                    body.append((char) b);
                }
            }
        });
        
        parser.parse(new ByteArrayInputStream(sb.toString().getBytes()));
        
        assertEquals("The body is right here\r\n", body.toString());
    }

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