ParamChecker (Apache Oozie Core 4.1.0 API)

java.lang.Object
- org.apache.oozie.util.ParamChecker

```
public class ParamChecker
extends Object
```
Utility class to check common parameter preconditions.

Constructor Summary

Constructors
Constructor and Description

ParamChecker()

Constructors
Constructor and Description
`ParamChecker()`

Method Summary

Methods
Modifier and Type	Method and Description
`static Date`	`checkDateOozieTZ(String date, String name)` Check whether the value is Oozie processing timezone data format.
`static String`	`checkFrequency(String val)` Check whether a value is a valid coordinator frequency.
`static int`	`checkGEZero(int value, String name)` Check whether the value is greater than or equals to 0.
`static int`	`checkGTZero(int value, String name)` Check whether the value is greater than or equals 0.
`static int`	`checkInteger(String val, String name)` Check whether the value is Integer.
`static int`	`checkLEZero(int value, String name)` Check whether the value is less than or equal to 0.
`static TimeZone`	`checkTimeZone(String tzStr, String name)` Check whether the value mention correct Timezone.
`static boolean`	`isMember(String item, String[] members, String name)` Check whether an item is a member of an array of string
`static boolean`	`isValidIdentifier(String token)` Return if the specified token is a valid Java identifier.
`static String`	`notEmpty(String str, String name)` Check that a string is not null and not empty.
`static String`	`notEmpty(String str, String name, String info)` Check that a string is not null and not empty.
`static List<String>`	`notEmptyElements(List<String> list, String name)` Check that a list is not null and that none of its elements is null.
`static <T> T`	`notNull(T obj, String name)` Check that a value is not null.
`static <T> List<T>`	`notNullElements(List<T> list, String name)` Check that a list is not null and that none of its elements is null.
`static String`	`validateActionName(String actionName)` Check that the given string is a valid action name [a-zA-Z_][0-9a-zA-Z_\-]* and not longer than 50 chars.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ParamChecker
```
public ParamChecker()
```
- Method Detail
  - notNull
```
public static <T> T notNull(T obj,
            String name)
```
    Check that a value is not null. If null throws an IllegalArgumentException.
    
    Parameters:
    obj - value.
    name - parameter name for the exception message.
    
    Returns:
    the given value.
  - notNullElements
```
public static <T> List<T> notNullElements(List<T> list,
                          String name)
```
    Check that a list is not null and that none of its elements is null. If null or if the list has emtpy elements throws an IllegalArgumentException.
    
    Parameters:
    list - the list of strings.
    name - parameter name for the exception message.
    
    Returns:
    the given list.
  - notEmpty
```
public static String notEmpty(String str,
              String name)
```
    Check that a string is not null and not empty. If null or emtpy throws an IllegalArgumentException.
    
    Parameters:
    str - value.
    name - parameter name for the exception message.
    
    Returns:
    the given value.
  - notEmpty
```
public static String notEmpty(String str,
              String name,
              String info)
```
    Check that a string is not null and not empty. If null or emtpy throws an IllegalArgumentException.
    
    Parameters:
    str - value.
    name - parameter name for the exception message.
    info - additional information to be printed with the exception message
    
    Returns:
    the given value.
  - notEmptyElements
```
public static List<String> notEmptyElements(List<String> list,
                            String name)
```
    Check that a list is not null and that none of its elements is null. If null or if the list has emtpy elements throws an IllegalArgumentException.
    
    Parameters:
    list - the list of strings.
    name - parameter name for the exception message.
    
    Returns:
    the given list.
  - validateActionName
```
public static String validateActionName(String actionName)
```
    Check that the given string is a valid action name [a-zA-Z_][0-9a-zA-Z_\-]* and not longer than 50 chars.
    
    Parameters:
    actionName - string to validate is a token.
    
    Returns:
    the given string.
  - isValidIdentifier
```
public static boolean isValidIdentifier(String token)
```
    Return if the specified token is a valid Java identifier.
    
    Parameters:
    token - string to validate if it is a valid Java identifier.
    
    Returns:
    if the specified token is a valid Java identifier.
  - checkGTZero
```
public static int checkGTZero(int value,
              String name)
```
    Check whether the value is greater than or equals 0.
    
    Parameters:
    value - : value to test
    name - : Name of the parameter
    
    Returns:
    If the value is > 0, return the value. Otherwise throw IllegalArgumentException
  - checkGEZero
```
public static int checkGEZero(int value,
              String name)
```
    Check whether the value is greater than or equals to 0.
    
    Parameters:
    value - : value to test
    name - : Name of the parameter
    
    Returns:
    If the value is >= 0, return the value. Otherwise throw IllegalArgumentException
  - checkLEZero
```
public static int checkLEZero(int value,
              String name)
```
    Check whether the value is less than or equal to 0.
    
    Parameters:
    value - : value to test
    name - : Name of the parameter
    
    Returns:
    If the value is <= 0, return the value. Otherwise throw IllegalArgumentException
  - checkInteger
```
public static int checkInteger(String val,
               String name)
```
    Check whether the value is Integer.
    
    Parameters:
    value - : value to test
    name - : Name of the parameter
    
    Returns:
    If the value is integer, return the value. Otherwise throw IllegalArgumentException
  - checkFrequency
```
public static String checkFrequency(String val)
```
    Check whether a value is a valid coordinator frequency.
    
    Parameters:
    value - : value to test
    
    Returns:
    If the value is a valid frequency, return the frequency, Otherwise throw IllegalArgumentException
  - checkDateOozieTZ
```
public static Date checkDateOozieTZ(String date,
                    String name)
```
    Check whether the value is Oozie processing timezone data format.
    
    Parameters:
    value - : value to test
    name - : Name of the parameter
    
    Returns:
    If the value is in Oozie processing timezone date format, return the value. Otherwise throw IllegalArgumentException
  - checkTimeZone
```
public static TimeZone checkTimeZone(String tzStr,
                     String name)
```
    Check whether the value mention correct Timezone.
    
    Parameters:
    value - : value to test
    name - : Name of the parameter
    
    Returns:
    If the value is correct TZ return the value. Otherwise throw IllegalArgumentException
  - isMember
```
public static boolean isMember(String item,
               String[] members,
               String name)
```
    Check whether an item is a member of an array of string
    
    Parameters:
    item - : item to test
    members - : List of items in string
    name - : Name of the parameter
    
    Returns:
    If the item is in the member return true. Otherwise throw IllegalArgumentException

Class ParamChecker

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ParamChecker

Method Detail

notNull

notNullElements

notEmpty

notEmpty

notEmptyElements

validateActionName

isValidIdentifier

checkGTZero

checkGEZero

checkLEZero

checkInteger

checkFrequency

checkDateOozieTZ

checkTimeZone

isMember