com.cedarsoftware.util

Class MapUtilities

java.lang.Object

com.cedarsoftware.util.MapUtilities

public class MapUtilities
extends Object

Usefule utilities for Maps

Author:

Kenneth Partlow
Copyright (c) Cedar Software LLC

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Method Summary

Modifier and Type	Method and Description
static <T> T	get(Map map, String key, T def) Retrieves a value from a map by key
static boolean	isEmpty(Map map) Returns null safe isEmpty check for Map

Methods inherited from class java.lang.Object

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

Method Detail

get

public static <T> T get(Map map,
                        String key,
                        T def)

Retrieves a value from a map by key

Parameters:

map - Map to retrieve item from

key - the key whose associated value is to be returned

def - value to return if item was not found.

Returns:

Returns a string value that was found at the location key. If the item is null then the def value is sent back. If the item is not the expected type, an exception is thrown.

Throws:

ClassCastException - if the item found is not a the expected type.

isEmpty

public static boolean isEmpty(Map map)

Returns null safe isEmpty check for Map

Parameters:

map - Map to check, can be null

Returns:

Returns true if map is empty or null