apache-poi/src/java/org/apache/poi/util/FixedField.java

/* ====================================================================
 * The Apache Software License, Version 1.1
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 */

package org.apache.poi.util;

import org.apache.poi.util.LittleEndian.BufferUnderrunException;

import java.io.*;

/**
 * behavior of a field at a fixed location within a byte array
 *
 * @author Marc Johnson (mjohnson at apache dot org
 */

public interface FixedField
{

    /**
     * set the value from its offset into an array of bytes
     *
     * @param data the byte array from which the value is to be read
     *
     * @exception ArrayIndexOutOfBoundsException if the offset is out
     *            of the array's valid index range
     */

    public void readFromBytes(byte [] data)
        throws ArrayIndexOutOfBoundsException;

    /**
     * set the value from an InputStream
     *
     * @param stream the InputStream from which the value is to be
     *               read
     *
     * @exception BufferUnderrunException if there is not enough data
     *            available from the InputStream
     * @exception IOException if an IOException is thrown from reading
     *            the InputStream
     */

    public void readFromStream(InputStream stream)
        throws IOException, BufferUnderrunException;

    /**
     * write the value out to an array of bytes at the appropriate
     * offset
     *
     * @param data the array of bytes to which the value is to be
     *             written
     *
     * @exception ArrayIndexOutOfBoundsException if the offset is out
     *            of the array's valid index range
     */

    public void writeToBytes(byte [] data)
        throws ArrayIndexOutOfBoundsException;

    /**
     * return the value as a String
     *
     * @return the value as a String
     */

    public String toString();
}   // end public interface FixedField