software.amazon.ion.util

Class IonStreamUtils

java.lang.Object

software.amazon.ion.util.IonStreamUtils

public class IonStreamUtils
extends Object

Utility methods for working with the Ion streaming interfaces, IonReader and IonWriter.

Constructor Summary

Constructors

Constructor and Description
IonStreamUtils()

Method Summary

Modifier and Type	Method and Description
static boolean	isGzip(byte[] buffer, int offset, int length) Determines whether a buffer contains GZIPped data.
static boolean	isIonBinary(byte[] buffer) Determines whether a buffer contains Ion binary data by looking for the presence of the Ion Version Marker at its start.
static boolean	isIonBinary(byte[] buffer, int offset, int length) Determines whether a buffer contains Ion binary data by looking for the presence of the Ion Version Marker at a given offset.
static InputStream	unGzip(InputStream in) Returns a stream that decompresses a stream if it contains GZIPped data, otherwise has no effect on the stream (but may wrap it).
static void	writeBoolList(IonWriter writer, boolean[] values) writes an IonList with a series of IonBool values.
static void	writeFloatList(IonWriter writer, double[] values) writes an IonList with a series of IonFloat values.
static void	writeFloatList(IonWriter writer, float[] values) writes an IonList with a series of IonFloat values.
static void	writeIntList(IonWriter writer, byte[] values) writes an IonList with a series of IonInt values.
static void	writeIntList(IonWriter writer, int[] values) writes an IonList with a series of IonInt values.
static void	writeIntList(IonWriter writer, long[] values) writes an IonList with a series of IonInt values.
static void	writeIntList(IonWriter writer, short[] values) writes an IonList with a series of IonInt values.
static void	writeStringList(IonWriter writer, String[] values) writes an IonList with a series of IonString values.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IonStreamUtils

public IonStreamUtils()

Method Detail

isIonBinary

public static boolean isIonBinary(byte[] buffer)

Determines whether a buffer contains Ion binary data by looking for the presence of the Ion Version Marker at its start. A false result does not imply that the buffer has Ion text, just that it's not Ion binary.

Parameters:

buffer - the data to check.

Returns:

true if the buffer contains Ion binary (starting from offset zero); false if the buffer is null or too short.

See Also:

isIonBinary(byte[], int, int)

isIonBinary

public static boolean isIonBinary(byte[] buffer,
                                  int offset,
                                  int length)

Determines whether a buffer contains Ion binary data by looking for the presence of the Ion Version Marker at a given offset. A false result does not imply that the buffer has Ion text, just that it's not Ion binary.

Parameters:

buffer - the data to check.

offset - the position in the buffer at which to start reading.

length - the number of bytes in the buffer that are valid, starting from offset.

Returns:

true if the buffer contains Ion binary (starting from offset); false if the buffer is null or if the length is too short.

See Also:

isIonBinary(byte[])

isGzip

public static boolean isGzip(byte[] buffer,
                             int offset,
                             int length)

Determines whether a buffer contains GZIPped data.

Parameters:

buffer - the data to check.

offset - the position in the buffer at which to start reading.

length - the number of bytes in the buffer that are valid, starting from offset.

Returns:

true if the buffer contains GZIPped data; false if the buffer is null or if the length is too short.

unGzip

public static InputStream unGzip(InputStream in)
                          throws IOException

Returns a stream that decompresses a stream if it contains GZIPped data, otherwise has no effect on the stream (but may wrap it).

Throws:

IOException

writeBoolList

public static void writeBoolList(IonWriter writer,
                                 boolean[] values)
                          throws IOException

writes an IonList with a series of IonBool values. This starts a List, writes the values (without any annoations) and closes the list. For text and tree writers this is just a convienience, but for the binary writer it can be optimized internally.

Parameters:

values - boolean values to populate the list with

Throws:

IOException

writeFloatList

public static void writeFloatList(IonWriter writer,
                                  float[] values)
                           throws IOException

writes an IonList with a series of IonFloat values. This starts a List, writes the values (without any annoations) and closes the list. For text and tree writers this is just a convienience, but for the binary writer it can be optimized internally. Note that since, currently, IonFloat is a 64 bit float this is a helper that simply casts the passed in floats to double before writing them.

Parameters:

values - 32 bit float values to populate the lists IonFloat's with

Throws:

IOException

writeFloatList

public static void writeFloatList(IonWriter writer,
                                  double[] values)
                           throws IOException

writes an IonList with a series of IonFloat values. This starts a List, writes the values (without any annoations) and closes the list. For text and tree writers this is just a convienience, but for the binary writer it can be optimized internally.

Parameters:

values - 64 bit float values to populate the lists IonFloat's with

Throws:

IOException

writeIntList

public static void writeIntList(IonWriter writer,
                                byte[] values)
                         throws IOException

writes an IonList with a series of IonInt values. This starts a List, writes the values (without any annoations) and closes the list. For text and tree writers this is just a convienience, but for the binary writer it can be optimized internally.

Parameters:

values - signed byte values to populate the lists int's with

Throws:

IOException

writeIntList

public static void writeIntList(IonWriter writer,
                                short[] values)
                         throws IOException

writes an IonList with a series of IonInt values. This starts a List, writes the values (without any annoations) and closes the list. For text and tree writers this is just a convienience, but for the binary writer it can be optimized internally.

Parameters:

values - signed short values to populate the lists int's with

Throws:

IOException

writeIntList

public static void writeIntList(IonWriter writer,
                                int[] values)
                         throws IOException

writes an IonList with a series of IonInt values. This starts a List, writes the values (without any annoations) and closes the list. For text and tree writers this is just a convienience, but for the binary writer it can be optimized internally.

Parameters:

values - signed int values to populate the lists int's with

Throws:

IOException

writeIntList

public static void writeIntList(IonWriter writer,
                                long[] values)
                         throws IOException

writes an IonList with a series of IonInt values. This starts a List, writes the values (without any annoations) and closes the list. For text and tree writers this is just a convienience, but for the binary writer it can be optimized internally.

Parameters:

values - signed long values to populate the lists int's with

Throws:

IOException

writeStringList

public static void writeStringList(IonWriter writer,
                                   String[] values)
                            throws IOException

writes an IonList with a series of IonString values. This starts a List, writes the values (without any annoations) and closes the list. For text and tree writers this is just a convienience, but for the binary writer it can be optimized internally.

Parameters:

values - Java String to populate the lists IonString's from

Throws:

IOException