2002-01-30 21:22:28 -05:00
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/* ====================================================================
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2004-04-09 09:05:39 -04:00
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Copyright 2002-2004 Apache Software Foundation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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2002-01-30 21:22:28 -05:00
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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 an integer (32-bit) field at a fixed location
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* within 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 IntegerField
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implements FixedField
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{
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private int _value;
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private final int _offset;
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/**
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* construct the IntegerField 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 the offset is
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* negative
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*/
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public IntegerField(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("negative 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 IntegerField 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 the offset is
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* negative
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*/
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public IntegerField(final int offset, final int 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 IntegerField 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 IntegerField(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 IntegerField 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 the offset is
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* negative or too large
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*/
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public IntegerField(final int offset, final int 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 IntegerField's current value
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*
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* @return current value
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*/
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public int 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 IntegerField'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 int 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 IntegerField's current value and write it to a byte
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* 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 too
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* large
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*/
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public void set(final int 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 too
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* large
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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.getInt(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.readInt(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 too
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* large
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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.putInt(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 IntegerField
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