Class ByteOrderDataInStream

1	/*
2	* Copyright (c) 2016 Vivid Solutions.
3	*
4	* All rights reserved. This program and the accompanying materials
5	* are made available under the terms of the Eclipse Public License 2.0
6	* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
7	* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v20.html
8	* and the Eclipse Distribution License is available at
9	*
10	* http://www.eclipse.org/org/documents/edl-v10.php.
11	*/
12	package org.locationtech.jts.io;
13
14	import java.io.IOException;
15
16	/**
17	* Allows reading a stream of Java primitive datatypes from an underlying
18	* {@link InStream},
19	* with the representation being in either common byte ordering.
20	*/
21	public class ByteOrderDataInStream
22	{
23	private int byteOrder = ByteOrderValues.BIG_ENDIAN;
24	private InStream stream;
25	// buffers to hold primitive datatypes
26	private byte[] buf1 = new byte[1];
27	private byte[] buf4 = new byte[4];
28	private byte[] buf8 = new byte[8];
29
30	public ByteOrderDataInStream()
31	{
32	this.stream = null;
33	}
34
35	public ByteOrderDataInStream(InStream stream)
36	{
37	this.stream = stream;
38	}
39
40	/**
41	* Allows a single ByteOrderDataInStream to be reused
42	* on multiple InStreams.
43	*
44	* @param stream
45	*/
46	public void setInStream(InStream stream)
47	{
48	this.stream = stream;
49	}
50	public void setOrder(int byteOrder)
51	{
52	this.byteOrder = byteOrder;
53	}
54
55	/**
56	* Reads a byte value
57	*
58	* @return the byte read
59	*/
60	public byte readByte()
61	throws IOException
62	{
63	stream.read(buf1);
64	return buf1[0];
65	}
66
67	public int readInt()
68	throws IOException
69	{
70	stream.read(buf4);
71	return ByteOrderValues.getInt(buf4, byteOrder);
72	}
73	public long readLong()
74	throws IOException
75	{
76	stream.read(buf8);
77	return ByteOrderValues.getLong(buf8, byteOrder);
78	}
79
80	public double readDouble()
81	throws IOException
82	{
83	stream.read(buf8);
84	return ByteOrderValues.getDouble(buf8, byteOrder);
85	}
86
87	}
88