source: contrib/MailArchiver/sources/vendor/mime4j/custom/core/src/main/java/org/apache/james/mime4j/stream/LenientFieldBuilder.java @ 6785

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 * 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   *
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
 * KIND, either express or implied.  See the License for the    *
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 * under the License.                                           *
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package org.apache.james.mime4j.stream;

import org.apache.james.mime4j.MimeException;
import org.apache.james.mime4j.io.MaxHeaderLengthLimitException;
import org.apache.james.mime4j.util.ByteArrayBuffer;
import org.apache.james.mime4j.util.CharsetUtil;

public class LenientFieldBuilder implements FieldBuilder {

    private final ByteArrayBuffer buf;
    private final int maxlen;
    

    public LenientFieldBuilder(int maxlen) {
        this.buf = new ByteArrayBuffer(1024);
        this.maxlen = maxlen;
    }
    
    public void reset() {
        this.buf.clear();
    }
    
    public void append(final ByteArrayBuffer line) throws MaxHeaderLengthLimitException {
        if (line == null) {
            return;
        }
        int len = line.length();
        if (this.maxlen > 0 && this.buf.length() + len >= this.maxlen) {
            // buffer is over the max limit: quietly ignore all further input
            return;
        }
        if (this.buf == null) {
        }
        int beginIndex = 0;
        int endIndex = len;
        while (beginIndex < endIndex 
                && CharsetUtil.isWhitespace((char)(line.byteAt(beginIndex) & 0xff))) {
            beginIndex++;
        }
        while (endIndex > beginIndex 
                && CharsetUtil.isWhitespace((char)(line.byteAt(endIndex - 1) & 0xff))) {
            endIndex--;
        }
        if (this.buf.length() > 0) {
            this.buf.append(' ');
        }
        this.buf.append(line.buffer(), beginIndex, endIndex - beginIndex);
    }
    
    public RawField build() throws MimeException {
        if (this.buf == null) {
            return null;
        }
        RawField field = RawFieldParser.DEFAULT.parseField(this.buf);
        // Discard modified raw data
        return new RawField(field.getName(), field.getBody());
    }
    
    public ByteArrayBuffer getRaw() {
        return null;
    }
    
}