org.hobbit.core.rabbit

Class RabbitMQUtils

java.lang.Object

org.hobbit.core.rabbit.RabbitMQUtils

public class RabbitMQUtils
extends Object

Contains utility methods for working with RabbitMQ.

Author:

Michael Röder (roeder@informatik.uni-leipzig.de)

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.jena.riot.Lang	DEFAULT_RDF_LANG
private static org.slf4j.Logger	LOGGER

Constructor Summary

Constructors

Constructor and Description
RabbitMQUtils()

Method Summary

Modifier and Type	Method and Description
static byte[]	readByteArray(ByteBuffer buffer) Reads a byte array from the given buffer assuming that it is preceded by an int value containing the length of the byte array.
static long	readLong(byte[] data) Reads a long value from the given byte array.
static long	readLong(byte[] data, int offset, int length) Reads a long value from the given byte array.
static org.apache.jena.rdf.model.Model	readModel(byte[] data) Reads an RDF model from the given byte array.
static org.apache.jena.rdf.model.Model	readModel(byte[] data, int offset, int length) Reads an RDF model from the given byte array.
static org.apache.jena.rdf.model.Model	readModel(ByteBuffer buffer) Reads an RDF model from the given byte buffer assuming that the byte array containing the model is preceded by an int containing its length.
static org.apache.jena.rdf.model.Model	readModel(String string) Reads an RDF model from the given String.
static String	readString(byte[] data) Transforms the given byte data into a String using the UTF-8 encoding.
static String	readString(byte[] data, int offset, int length) Transforms the given byte data into a String using the UTF-8 encoding.
static String	readString(ByteBuffer buffer) Reads a String from the given buffer assuming that it is preceded by an int value containing the length of the String.
static byte[]	writeByteArrays(byte[][] arrays) writes the given byte arrays and puts their length in front of them.
static byte[]	writeByteArrays(byte[] precedingData, byte[][] arrays, byte[] subsequentData) writes the given byte arrays and puts their length in front of them.
static byte[]	writeLong(long value) Creates a byte array representing the given long value.
static byte[]	writeModel(org.apache.jena.rdf.model.Model model) Creates a byte array containing the serialized RDF model using the DEFAULT_RDF_LANG.
static String	writeModel2String(org.apache.jena.rdf.model.Model model) Creates a String containing the serialized RDF model using the DEFAULT_RDF_LANG.
static byte[]	writeString(String string) Creates a byte array representation of the given String using UTF-8 encoding.

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

private static final org.slf4j.Logger LOGGER

DEFAULT_RDF_LANG

public static final org.apache.jena.riot.Lang DEFAULT_RDF_LANG

Constructor Detail

RabbitMQUtils

public RabbitMQUtils()

Method Detail

readByteArray

public static byte[] readByteArray(ByteBuffer buffer)

Reads a byte array from the given buffer assuming that it is preceded by an int value containing the length of the byte array.

Parameters:

buffer - the buffer containing an int containing the length of the byte array followed by the byte array itself

Returns:

the byte array or null if the given byte array is null

readModel

public static org.apache.jena.rdf.model.Model readModel(byte[] data)

Reads an RDF model from the given byte array.

Parameters:

data - the byte array containing the serialized RDF model

Returns:

the deserialized model

readModel

public static org.apache.jena.rdf.model.Model readModel(byte[] data,
                                                        int offset,
                                                        int length)

Reads an RDF model from the given byte array.

Parameters:

data - the byte array containing the serialized RDF model

offset - position at which the parsing will start

length - number of bytes that should be parsed

Returns:

the deserialized model

readModel

public static org.apache.jena.rdf.model.Model readModel(String string)

Reads an RDF model from the given String.

Parameters:

string - the String containing the serialized RDF model

Returns:

the deserialized model

readModel

public static org.apache.jena.rdf.model.Model readModel(ByteBuffer buffer)

Reads an RDF model from the given byte buffer assuming that the byte array containing the model is preceded by an int containing its length.

Parameters:

buffer - the buffer containing the length of the serialized model (as int) and the byte array containing the serialized model

Returns:

the deserialized model

readString

public static String readString(byte[] data)

Transforms the given byte data into a String using the UTF-8 encoding.

Parameters:

data - the byte array that should be transformed

Returns:

the String or null if the given byte array is null

readString

public static String readString(byte[] data,
                                int offset,
                                int length)

Transforms the given byte data into a String using the UTF-8 encoding.

Parameters:

data - the byte array that should be transformed

offset - position at which the parsing will start

length - number of bytes that should be parsed

Returns:

the String or null if the given byte array is null

readString

public static String readString(ByteBuffer buffer)

Reads a String from the given buffer assuming that it is preceded by an int value containing the length of the String.

Parameters:

buffer - the buffer that contains the byte data of the String

Returns:

the String or null if the given buffer is null

writeByteArrays

public static byte[] writeByteArrays(byte[][] arrays)

writes the given byte arrays and puts their length in front of them. Thus, they can be read using a ByteBuffer and the readByteArray(ByteBuffer) method.

Parameters:

arrays - arrays that should be written to a single array

Returns:

the byte array containing all given arrays and their lengths

writeByteArrays

public static byte[] writeByteArrays(byte[] precedingData,
                                     byte[][] arrays,
                                     byte[] subsequentData)

writes the given byte arrays and puts their length in front of them. Thus, they can be read using a ByteBuffer and the readByteArray(ByteBuffer) method.

Parameters:

precedingData - data that should be written before the arrays are written. Note that this data is not preceded with the byte array length.

arrays - arrays that should be written to a single array

subsequentData - data that should be written after the arrays are written. Note that this data is not preceded with the byte array length.

Returns:

the byte array containing all given arrays and their lengths

writeString

public static byte[] writeString(String string)

Creates a byte array representation of the given String using UTF-8 encoding.

Parameters:

string - the String that should be transformed into a byte array

Returns:

the UTF-8 byte array of the given String

writeModel2String

public static String writeModel2String(org.apache.jena.rdf.model.Model model)

Creates a String containing the serialized RDF model using the DEFAULT_RDF_LANG.

Parameters:

model - the model that should be serialized

Returns:

the String containing the model

writeModel

public static byte[] writeModel(org.apache.jena.rdf.model.Model model)

Creates a byte array containing the serialized RDF model using the DEFAULT_RDF_LANG.

Parameters:

model - the model that should be serialized

Returns:

the byte array containing the model

writeLong

public static byte[] writeLong(long value)

Creates a byte array representing the given long value.

Parameters:

value - the value that should be serialized

Returns:

the byte array containing the given long value

readLong

public static long readLong(byte[] data)

Reads a long value from the given byte array.

Parameters:

data - a serialized long value

Returns:

the value read from the array

readLong

public static long readLong(byte[] data,
                            int offset,
                            int length)

Reads a long value from the given byte array.

Parameters:

data - a serialized long value

offset - position at which the parsing will start

length - number of bytes that should be parsed (should equal Long.BYTES)

Returns:

the value read from the array