org.apache.hawq.pxf.api.utilities

Class Utilities

java.lang.Object

org.apache.hawq.pxf.api.utilities.Utilities

public class Utilities
extends java.lang.Object

Utilities class exposes helper method for PXF classes

Constructor Summary

Constructors

Constructor and Description
Utilities()

Method Summary

Modifier and Type	Method and Description
static void	byteArrayToOctalString(byte[] bytes, java.lang.StringBuilder sb) Transforms a byte array into a string of octal codes in the form \\xyz\\xyz We double escape each char because it is required in postgres bytea for some bytes.
static java.lang.Object	createAnyInstance(java.lang.Class<?> confClass, java.lang.String className, InputData metaData) Creates an object using the class name.
static java.lang.Object	createAnyInstance(java.lang.String className) Creates an object using the class name with its default constructor.
static java.lang.String	maskNonPrintables(java.lang.String input) Replaces any non-alpha-numeric character with a '.'.

Methods inherited from class java.lang.Object

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

Constructor Detail

Utilities

public Utilities()

Method Detail

createAnyInstance

public static java.lang.Object createAnyInstance(java.lang.Class<?> confClass,
                                                 java.lang.String className,
                                                 InputData metaData)
                                          throws java.lang.Exception

Creates an object using the class name. The class name has to be a class located in the webapp's CLASSPATH.

Parameters:

confClass - the class of the metaData used to initialize the instance

className - a class name to be initialized.

metaData - input data used to initialize the class

Returns:

Initialized instance of given className

Throws:

java.lang.Exception - throws exception if classname was not found in classpath, didn't have expected constructor or failed to be instantiated

createAnyInstance

public static java.lang.Object createAnyInstance(java.lang.String className)
                                          throws java.lang.Exception

Creates an object using the class name with its default constructor. The class name has to be a class located in the webapp's CLASSPATH.

Parameters:

className - a class name to be initialized

Returns:

initialized instance of given className

Throws:

java.lang.Exception - throws exception if classname was not found in classpath, didn't have expected constructor or failed to be instantiated

byteArrayToOctalString

public static void byteArrayToOctalString(byte[] bytes,
                                          java.lang.StringBuilder sb)

Transforms a byte array into a string of octal codes in the form \\xyz\\xyz We double escape each char because it is required in postgres bytea for some bytes. In the minimum all non-printables, backslash, null and single quote. Easier to just escape everything see http://www.postgresql.org/docs/9.0/static/datatype-binary.html Octal codes must be padded to 3 characters (001, 012)

Parameters:

bytes - bytes to escape

sb - octal codes of given bytes

maskNonPrintables

public static java.lang.String maskNonPrintables(java.lang.String input)

Replaces any non-alpha-numeric character with a '.'. This measure is used to prevent cross-site scripting (XSS) when an input string might include code or script. By removing all special characters and returning a censured string to the user this threat is avoided.

Parameters:

input - string to be masked

Returns:

masked string