/* ====================================================================   Copyright 2002-2004   Apache Software Foundation   Licensed 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       http://www.apache.org/licenses/LICENSE-2.0   Unless required by applicable law or agreed to in writing, software   distributed under the License is distributed on an "AS IS" BASIS,   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   See the License for the specific language governing permissions and   limitations under the License.==================================================================== */        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