Package org.activiti.engine.impl.util

Class CollectionUtil

java.lang.Object

org.activiti.engine.impl.util.CollectionUtil

public class CollectionUtil
extends Object

helper/convenience methods for working with collections.

Method Summary

Modifier and Type	Method	Description
static boolean	isEmpty(Collection<?> collection)
static boolean	isNotEmpty(Collection<?> collection)
static Map<String,Object>	map(Object... objects)	Helper method to easily create a map with keys of type String and values of type Object.
static <T> Map<String,T>	mapOfClass(Class<T> clazz, Object... objects)	Helper method to easily create a map with keys of type String and values of a given Class.
static Map<String,Object>	singletonMap(String key, Object value)	Helper method that creates a singleton map.

Methods inherited from class java.lang.Object

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

Method Details

singletonMap

public static Map<String,Object> singletonMap(String key,
 Object value)

Helper method that creates a singleton map. Alternative for singletonMap()), since that method returns a generic typed map <K,T> depending on the input type, but we often need a <String, Object> map.

map

public static Map<String,Object> map(Object... objects)

Helper method to easily create a map with keys of type String and values of type Object. Null values are allowed.

Parameters:

objects - varargs containing the key1, value1, key2, value2, etc. Note: although an Object, we will cast the key to String internally

Throws:

ActivitiIllegalArgumentException - when objects are not even or key/value are not expected types

mapOfClass

public static <T> Map<String,T> mapOfClass(Class<T> clazz,
 Object... objects)

Helper method to easily create a map with keys of type String and values of a given Class. Null values are allowed.

Parameters:

clazz - the target Value class

objects - varargs containing the key1, value1, key2, value2, etc. Note: although an Object, we will cast the key to String internally

Throws:

ActivitiIllegalArgumentException - when objects are not even or key/value are not expected types

isEmpty

public static boolean isEmpty(Collection<?> collection)

isNotEmpty

public static boolean isNotEmpty(Collection<?> collection)