org.apache.pig.impl.util
Class Utils

java.lang.Object
  org.apache.pig.impl.util.Utils

public class Utils
extends Object

Class with utility static methods

Constructor Summary

Utils()

Method Summary

static FuncSpec	buildSimpleFuncSpec(String className, byte... types)
static boolean	checkNullAndClass(Object obj1, Object obj2) This method is a helper for classes to implement Object.equals(java.lang.Object) The method checks whether the two arguments are both null or both not null and whether they are of the same class
static boolean	checkNullEquals(Object obj1, Object obj2, boolean checkEquality) This method is a helper for classes to implement Object.equals(java.lang.Object) checks if two objects are equals - two levels of checks are made - first if both are null or not null.
static ResourceSchema	getSchema(LoadFunc wrappedLoadFunc, String location, boolean checkExistence, org.apache.hadoop.mapreduce.Job job)
static Schema	getSchemaFromString(String schemaString)
static Schema	getScriptSchema(String loadFuncSignature, org.apache.hadoop.conf.Configuration conf) A helper function for retrieving the script schema set by the LOLoad function.
static String	getStringFromArray(String[] arr)
static String	getTmpFileCompressorName(PigContext pigContext)
static FileInputLoadFunc	getTmpFileStorageObject(org.apache.hadoop.conf.Configuration conf)
static <O> Collection<O>	mergeCollection(Collection<O> a, Collection<O> b)
static LogicalSchema	parseSchema(String schemaString)
static String	slashisize(String str) Replace sequences of two slashes ("\\") with one slash ("\") (not escaping a slash in grunt is disallowed, but a double slash doesn't get converted into a regular slash, so we have to do it instead)
static boolean	tmpFileCompression(PigContext pigContext)
static String	tmpFileCompressionCodec(PigContext pigContext)

Methods inherited from class java.lang.Object

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

Constructor Detail

Utils

public Utils()

Method Detail

checkNullEquals

public static boolean checkNullEquals(Object obj1,
                                      Object obj2,
                                      boolean checkEquality)

This method is a helper for classes to implement Object.equals(java.lang.Object) checks if two objects are equals - two levels of checks are made - first if both are null or not null. If either is null, check is made whether both are null. If both are non null, equality also is checked if so indicated

Parameters:

obj1 - first object to be compared

obj2 - second object to be compared

checkEquality - flag to indicate whether object equality should be checked if obj1 and obj2 are non-null

Returns:

true if the two objects are equal false otherwise

checkNullAndClass

public static boolean checkNullAndClass(Object obj1,
                                        Object obj2)

This method is a helper for classes to implement Object.equals(java.lang.Object) The method checks whether the two arguments are both null or both not null and whether they are of the same class

Parameters:

obj1 - first object to compare

obj2 - second object to compare

Returns:

true if both objects are null or both are not null and if both are of the same class if not null false otherwise

getScriptSchema

public static Schema getScriptSchema(String loadFuncSignature,
                                     org.apache.hadoop.conf.Configuration conf)
                              throws IOException

A helper function for retrieving the script schema set by the LOLoad function.

Parameters:

loadFuncSignature -

conf -

Returns:

Schema

Throws:

IOException

getSchema

public static ResourceSchema getSchema(LoadFunc wrappedLoadFunc,
                                       String location,
                                       boolean checkExistence,
                                       org.apache.hadoop.mapreduce.Job job)
                                throws IOException

Throws:

IOException

getSchemaFromString

public static Schema getSchemaFromString(String schemaString)
                                  throws ParserException

Parameters:

schemaString -

Returns:

Schema instance

Throws:

ParserException

parseSchema

public static LogicalSchema parseSchema(String schemaString)
                                 throws ParserException

Throws:

ParserException

getTmpFileCompressorName

public static String getTmpFileCompressorName(PigContext pigContext)

getTmpFileStorageObject

public static FileInputLoadFunc getTmpFileStorageObject(org.apache.hadoop.conf.Configuration conf)
                                                 throws IOException

Throws:

IOException

tmpFileCompression

public static boolean tmpFileCompression(PigContext pigContext)

tmpFileCompressionCodec

public static String tmpFileCompressionCodec(PigContext pigContext)
                                      throws IOException

Throws:

IOException

getStringFromArray

public static String getStringFromArray(String[] arr)

buildSimpleFuncSpec

public static FuncSpec buildSimpleFuncSpec(String className,
                                           byte... types)

slashisize

public static String slashisize(String str)

Replace sequences of two slashes ("\\") with one slash ("\") (not escaping a slash in grunt is disallowed, but a double slash doesn't get converted into a regular slash, so we have to do it instead)

Parameters:

str -

Returns:

the resulting string

mergeCollection

public static <O> Collection<O> mergeCollection(Collection<O> a,
                                                Collection<O> b)