apache-mime4j-0.6/src/main/java/org/apache/james/mime4j/io/LineReaderInputStream.java

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package org.apache.james.mime4j.io;

import org.apache.james.mime4j.util.ByteArrayBuffer;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * Input stream capable of reading lines of text. 
 */
public abstract class LineReaderInputStream extends FilterInputStream {

    protected LineReaderInputStream(InputStream in) {
        super(in);
    }

    /**
     * Reads one line of text into the given {@link ByteArrayBuffer}.
     *  
     * @param dst Destination
     * @return number of bytes copied or <code>-1</code> if the end of 
     * the stream has been reached.
     * 
     * @throws IOException in case of an I/O error.
     */
    public abstract int readLine(final ByteArrayBuffer dst) throws IOException;
    
}