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From mben...@apache.org
Subject [03/15] bval git commit: lazy
Date Wed, 15 Nov 2017 22:54:08 GMT
lazy


Project: http://git-wip-us.apache.org/repos/asf/bval/repo
Commit: http://git-wip-us.apache.org/repos/asf/bval/commit/29a6ded2
Tree: http://git-wip-us.apache.org/repos/asf/bval/tree/29a6ded2
Diff: http://git-wip-us.apache.org/repos/asf/bval/diff/29a6ded2

Branch: refs/heads/bv2
Commit: 29a6ded2f44f68fc0b9dda8f213d354990e6457f
Parents: bc99828
Author: Matt Benson <mbenson@apache.org>
Authored: Wed Nov 15 14:50:30 2017 -0600
Committer: Matt Benson <mbenson@apache.org>
Committed: Wed Nov 15 16:53:42 2017 -0600

----------------------------------------------------------------------
 .../main/java/org/apache/bval/util/Lazy.java    | 51 ++++++++++++++++++++
 .../main/java/org/apache/bval/util/LazyInt.java | 49 +++++++++++++++++++
 2 files changed, 100 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/bval/blob/29a6ded2/bval-core/src/main/java/org/apache/bval/util/Lazy.java
----------------------------------------------------------------------
diff --git a/bval-core/src/main/java/org/apache/bval/util/Lazy.java b/bval-core/src/main/java/org/apache/bval/util/Lazy.java
new file mode 100644
index 0000000..b1cd9c3
--- /dev/null
+++ b/bval-core/src/main/java/org/apache/bval/util/Lazy.java
@@ -0,0 +1,51 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You 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.
+ */
+package org.apache.bval.util;
+
+import java.util.Optional;
+import java.util.function.Supplier;
+
+/**
+ * @since 2.0
+ *
+ * @param <T>
+ */
+public class Lazy<T> implements Supplier<T> {
+    private T value;
+    private Supplier<T> init;
+
+    public Lazy(Supplier<T> init) {
+        this.init = Validate.notNull(init);
+    }
+
+    @Override
+    public T get() {
+        if (init != null) {
+            synchronized (this) {
+                if (init != null) {
+                    value = init.get();
+                    init = null;
+                }
+            }
+        }
+        return value;
+    }
+
+    public Optional<T> optional() {
+        return Optional.ofNullable(value);
+    }
+}

http://git-wip-us.apache.org/repos/asf/bval/blob/29a6ded2/bval-core/src/main/java/org/apache/bval/util/LazyInt.java
----------------------------------------------------------------------
diff --git a/bval-core/src/main/java/org/apache/bval/util/LazyInt.java b/bval-core/src/main/java/org/apache/bval/util/LazyInt.java
new file mode 100644
index 0000000..44e09dd
--- /dev/null
+++ b/bval-core/src/main/java/org/apache/bval/util/LazyInt.java
@@ -0,0 +1,49 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You 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.
+ */
+package org.apache.bval.util;
+
+import java.util.OptionalInt;
+import java.util.function.IntSupplier;
+
+/**
+ * @since 2.0
+ */
+public class LazyInt implements IntSupplier {
+    private int value;
+    private IntSupplier init;
+
+    public LazyInt(IntSupplier init) {
+        this.init = Validate.notNull(init);
+    }
+
+    @Override
+    public int getAsInt() {
+        if (init != null) {
+            synchronized (this) {
+                if (init != null) {
+                    value = init.getAsInt();
+                    init = null;
+                }
+            }
+        }
+        return value;
+    }
+
+    public synchronized OptionalInt optional() {
+        return init == null ? OptionalInt.of(value) : OptionalInt.empty();
+    }
+}


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