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* Licensed to the Apache Software Foundation (ASF) under one * | |
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* regarding copyright ownership. The ASF licenses this file * | |
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* "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 * | |
* * | |
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* software distributed under the License is distributed on an * | |
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package org.apache.james.mime4j; | |
import org.apache.james.mime4j.decoder.Base64InputStream; | |
import org.apache.james.mime4j.decoder.QuotedPrintableInputStream; | |
import org.apache.james.mime4j.field.Field; | |
import org.apache.james.mime4j.message.Header; | |
import java.io.InputStream; | |
import java.io.IOException; | |
/** | |
* Abstract implementation of ContentHandler that automates common | |
* tasks. Currently performs header parsing and applies content-transfer | |
* decoding to body parts. | |
* | |
* | |
*/ | |
public abstract class SimpleContentHandler extends AbstractContentHandler { | |
/** | |
* Called after headers are parsed. | |
*/ | |
public abstract void headers(Header header); | |
/** | |
* Called when the body of a discrete (non-multipart) entity is encountered. | |
* @param bd encapsulates the values (either read from the | |
* message stream or, if not present, determined implictly | |
* as described in the | |
* MIME rfc:s) of the <code>Content-Type</code> and | |
* <code>Content-Transfer-Encoding</code> header fields. | |
* @param is the contents of the body. Base64 or quoted-printable | |
* decoding will be applied transparently. | |
* @throws IOException should be thrown on I/O errors. | |
*/ | |
public abstract void bodyDecoded(BodyDescriptor bd, InputStream is) throws IOException; | |
/* Implement introduced callbacks. */ | |
private Header currHeader; | |
/** | |
* @see org.apache.james.mime4j.AbstractContentHandler#startHeader() | |
*/ | |
public final void startHeader() { | |
currHeader = new Header(); | |
} | |
/** | |
* @see org.apache.james.mime4j.AbstractContentHandler#field(java.lang.String) | |
*/ | |
public final void field(String fieldData) { | |
currHeader.addField(Field.parse(fieldData)); | |
} | |
/** | |
* @see org.apache.james.mime4j.AbstractContentHandler#endHeader() | |
*/ | |
public final void endHeader() { | |
Header tmp = currHeader; | |
currHeader = null; | |
headers(tmp); | |
} | |
/** | |
* @see org.apache.james.mime4j.AbstractContentHandler#body(org.apache.james.mime4j.BodyDescriptor, java.io.InputStream) | |
*/ | |
public final void body(BodyDescriptor bd, InputStream is) throws IOException { | |
if (bd.isBase64Encoded()) { | |
bodyDecoded(bd, new Base64InputStream(is)); | |
} | |
else if (bd.isQuotedPrintableEncoded()) { | |
bodyDecoded(bd, new QuotedPrintableInputStream(is)); | |
} | |
else { | |
bodyDecoded(bd, is); | |
} | |
} | |
} |