254 lines
7.6 KiB
Java
254 lines
7.6 KiB
Java
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2003 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache POI" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache POI", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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package org.apache.poi.util;
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import org.apache.poi.util.LittleEndian.BufferUnderrunException;
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import java.io.*;
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/**
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* representation of a long (16-bit) field at a fixed location within
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* a byte array
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*
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* @author Marc Johnson (mjohnson at apache dot org
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*/
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public class LongField
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implements FixedField
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{
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private long _value;
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private final int _offset;
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/**
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* construct the LongField with its offset into its containing
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* byte array
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*
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* @param offset of the field within its byte array
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*
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* @exception ArrayIndexOutOfBoundsException if offset is negative
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*/
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public LongField(final int offset)
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throws ArrayIndexOutOfBoundsException
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{
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if (offset < 0)
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{
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throw new ArrayIndexOutOfBoundsException("Illegal offset: "
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+ offset);
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}
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_offset = offset;
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}
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/**
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* construct the LongField with its offset into its containing
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* byte array and initialize its value
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*
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* @param offset of the field within its byte array
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* @param value the initial value
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*
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* @exception ArrayIndexOutOfBoundsException if offset is negative
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*/
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public LongField(final int offset, final long value)
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throws ArrayIndexOutOfBoundsException
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{
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this(offset);
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set(value);
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}
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/**
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* Construct the LongField with its offset into its containing
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* byte array and initialize its value from its byte array
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*
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* @param offset of the field within its byte array
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* @param data the byte array to read the value from
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*
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* @exception ArrayIndexOutOfBoundsException if the offset is not
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* within the range of 0..(data.length - 1)
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*/
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public LongField(final int offset, final byte [] data)
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throws ArrayIndexOutOfBoundsException
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{
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this(offset);
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readFromBytes(data);
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}
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/**
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* construct the LongField with its offset into its containing
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* byte array, initialize its value, and write the value to a byte
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* array
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*
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* @param offset of the field within its byte array
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* @param value the initial value
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* @param data the byte array to write the value to
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*
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* @exception ArrayIndexOutOfBoundsException if offset is negative
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*/
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public LongField(final int offset, final long value, final byte [] data)
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throws ArrayIndexOutOfBoundsException
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{
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this(offset);
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set(value, data);
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}
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/**
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* get the LongField's current value
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*
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* @return current value
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*/
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public long get()
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{
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return _value;
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}
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/**
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* set the LongField's current value
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*
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* @param value to be set
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*/
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public void set(final long value)
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{
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_value = value;
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}
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/**
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* set the LongField's current value and write it to a byte array
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*
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* @param value to be set
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* @param data the byte array to write the value to
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*
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* @exception ArrayIndexOutOfBoundsException if the offset is out
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* of range
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*/
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public void set(final long value, final byte [] data)
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throws ArrayIndexOutOfBoundsException
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{
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_value = value;
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writeToBytes(data);
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}
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/* ********** START implementation of FixedField ********** */
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/**
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* set the value from its offset into an array of bytes
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*
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* @param data the byte array from which the value is to be read
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*
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* @exception ArrayIndexOutOfBoundsException if the offset is out
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* of range
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*/
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public void readFromBytes(final byte [] data)
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throws ArrayIndexOutOfBoundsException
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{
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_value = LittleEndian.getLong(data, _offset);
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}
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/**
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* set the value from an InputStream
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*
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* @param stream the InputStream from which the value is to be
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* read
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*
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* @exception BufferUnderrunException if there is not enough data
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* available from the InputStream
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* @exception IOException if an IOException is thrown from reading
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* the InputStream
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*/
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public void readFromStream(final InputStream stream)
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throws IOException, BufferUnderrunException
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{
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_value = LittleEndian.readLong(stream);
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}
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/**
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* write the value out to an array of bytes at the appropriate
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* offset
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*
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* @param data the array of bytes to which the value is to be
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* written
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*
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* @exception ArrayIndexOutOfBoundsException if the offset is out
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* of range
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*/
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public void writeToBytes(final byte [] data)
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throws ArrayIndexOutOfBoundsException
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{
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LittleEndian.putLong(data, _offset, _value);
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}
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/**
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* return the value as a String
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*
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* @return the value as a String
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*/
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public String toString()
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{
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return String.valueOf(_value);
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}
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/* ********** END implementation of FixedField ********** */
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} // end public class LongField
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