JarCastingmap-support
Map utilities for Java.
Examples
Factory methods
Unmodifiable maps
Use fun.mike.map.alpha.Factory/mapOf to make unordered unmodifiable maps.
import static fun.mike.map.alpha.Factory.mapOf;
Map<String, Integer> map = mapOf("foo", 1,
"bar", 2);
// => {bar=2, foo=1} (java.util.Collections$UnmodifiableMap from java.util.HashMap)
Ordered unmodifiable maps
Use fun.mike.map.alpha.Factory/orderedMapOf to make ordered unmodifiable maps.
import static fun.mike.map.alpha.Factory.orderedMapOf;
Map<String, Integer> map = orderedMapOf("foo", 1,
"bar", 2);
// => {foo=1, bar=2} (java.util.Collections$UnmodifiableMap from java.util.LinkedHashMap)
Mutable maps
Use fun.mike.map.alpha.MutableFactory/mutableMapOf to make unordered mutable maps.
import static fun.mike.map.alpha.Factory.mutableMapOf;
Map<String, Integer> map = mutableMapOf("foo", 1,
"bar", 2);
// => {bar=2, foo=1} (java.util.HashMap)
Ordered mutable maps
Use fun.mike.map.alpha.MutableFactory/mutableMapOf to make ordered mutable maps.
import static fun.mike.map.alpha.MutableFactory.mutableOrderedMapOf;
Map<String, Integer> map = mutableOrderedMapOf("foo", 1,
"bar", 2);
// => {foo=1, bar=2} (java.util.LinkedHashMap)
Access
Use fun.mike.map.alpha.Get to get validated values from maps.
Anything
import static fun.mike.map.alpha.Get.required;
Map<String, Object> map = mapOf("foo", "bar");
required(map, "foo");
// => "bar"
required(map, "baz");
// => java.util.NoSuchElementException: Missing required value for key "baz".
Strings
Required strings:
import static fun.mike.map.alpha.Get.requiredString;
Map<String, Object> map = mapOf("ok", "foo",
"text", 1);
requiredString(map, "ok");
// => "foo"
requiredString(map, "missing");
// => java.util.NoSuchElementException: Missing required string value for key "missing".
requiredString(map, "text");
// => java.lang.IllegalArgumentException: Value "1" of class "java.lang.Integer" for key "text" must be a string.
Populated strings:
import static fun.mike.map.alpha.Get.populatedString;
Map<String, Object> map = mapOf("ok", "foo",
"empty", " ",
"text", 1);
populatedString(map, "ok");
// => "foo"
populated(map, "missing");
// => java.util.NoSuchElementException: Missing required string value for key "missing".
populated(map, "empty");
// => java.util.NoSuchElementException: Value " " for key "empty" must be populated.
populatedString(map, "text");
// => java.lang.IllegalArgumentException: Value "1" of class "java.lang.Integer" for key "text" must be a string.
String URLs:
import static fun.mike.map.alpha.Get.populatedString;
Map<String, Object> map = mapOf("valid", "http://foo.com",
"invalid", "hewa:/ea90mS-fwa");
populatedString(map, "valid");
// => "http://foo.com",
populatedString(map, "invalid");
// => java.lang.IllegalArgumentException: Invalid URL value "hewa:/ea90mS-fwa" for key "foo": Scheme "hewa" not allowed. Allowed schemes: http, https
Build
Copyright and License
This project is licensed under the terms of the Apache 2.0 license.