Remove Mammoth prefix from util classes

1 files changed, 97 insertions, 0 deletions

diff --git a/src/main/java/org/zwobble/mammoth/internal/util/Maps.java b/src/main/java/org/zwobble/mammoth/internal/util/Maps.java
new file mode 100644
index 0000000..76ce5cf
--- /dev/null
+++ b/src/main/java/org/zwobble/mammoth/internal/util/Maps.java
@@ -0,0 +1,97 @@
+package org.zwobble.mammoth.internal.util;
+
+import java.util.*;
+import java.util.function.Function;
+
+public class Maps {
+    public static <K, V> Map<K, V> map() {
+        return Collections.emptyMap();
+    }
+
+    public static <K, V> Map<K, V> map(K key1, V value1) {
+        return Collections.singletonMap(key1, value1);
+    }
+
+    public static <K, V> Map<K, V> map(K key1, V value1, K key2, V value2) {
+        Map<K, V> map = new HashMap<>();
+        map.put(key1, value1);
+        map.put(key2, value2);
+        return map;
+    }
+
+    public static <K, V> Map<K, V> map(K key1, V value1, K key2, V value2, K key3, V value3) {
+        Map<K, V> map = new HashMap<>();
+        map.put(key1, value1);
+        map.put(key2, value2);
+        map.put(key3, value3);
+        return map;
+    }
+
+    public static <K, V> Map.Entry<K, V> entry(K key, V value) {
+        return new AbstractMap.SimpleImmutableEntry<K, V>(key, value);
+    }
+
+    public static <K, V> Optional<V> lookup(Map<K, V> map, K key) {
+        return Optional.ofNullable(map.get(key));
+    }
+
+    public static <T, K> Map<K, T> toMapWithKey(Iterable<T> iterable, Function<T, K> function) {
+        return toMap(iterable, element -> entry(function.apply(element), element));
+    }
+
+    public static <T, K, V> Map<K, V> toMap(Iterable<T> iterable, Function<T, Map.Entry<K, V>> function) {
+        Map<K, V> map = new HashMap<>();
+        for (T element : iterable) {
+            Map.Entry<K, V> entry = function.apply(element);
+            map.put(entry.getKey(), entry.getValue());
+        }
+        return map;
+    }
+
+    public static <T, K> Map<K, List<T>> toMultiMapWithKey(Iterable<T> iterable, Function<T, K> function) {
+        return toMultiMap(iterable, element -> entry(function.apply(element), element));
+    }
+
+    public static <T, K, V> Map<K, List<V>> toMultiMap(Iterable<T> iterable, Function<T, Map.Entry<K, V>> function) {
+        Map<K, List<V>> map = new HashMap<>();
+        for (T element : iterable) {
+            Map.Entry<K, V> pair = function.apply(element);
+            map.computeIfAbsent(pair.getKey(), key -> new ArrayList<V>())
+                .add(pair.getValue());
+        }
+        return map;
+    }
+
+    public static <K1, K2, V> Map<K2, V> eagerMapKeys(Map<K1, V> map, Function<K1, K2> function) {
+        Map<K2, V> result = new HashMap<>();
+        for (Map.Entry<K1, V> element : map.entrySet()) {
+            result.put(function.apply(element.getKey()), element.getValue());
+        }
+        return result;
+    }
+
+    public static <K, V1, V2> Map<K, V2> eagerMapValues(Map<K, V1> map, Function<V1, V2> function) {
+        Map<K, V2> result = new HashMap<>();
+        for (Map.Entry<K, V1> element : map.entrySet()) {
+            result.put(element.getKey(), function.apply(element.getValue()));
+        }
+        return result;
+    }
+
+    public static <K, V> Builder<K, V> builder() {
+        return new Builder<>();
+    }
+
+    public static class Builder<K, V> {
+        private final Map<K, V> values = new HashMap<>();
+
+        public Builder<K, V> put(K key, V value) {
+            values.put(key, value);
+            return this;
+        }
+
+        public Map<K, V> build() {
+            return values;
+        }
+    }
+}