randomaccessstream.java

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package org.garret.perst;

/**
 * This interface extends nomal Java streams with seek capability.
 * This interface is implemented by Perst BLOB streams
 */
public interface RandomAccessStream { 
    /**
     * Set position in the stream
     * @param pos new absolute poistion in the strwam
     * @return actual position - it can be less than specified if end of stream is reached
     */
    public long setPosition(long pos);

    /**
     * Get current position in the stream
     * @return current poistion in the stream
     */
    public long getPosition();

    /**
     * Get size of the stream
     * @return number of bytes available in the stream
     */
    public long size();
}