From 578c6638badb1c427f2335432cb93d9a1a1eddce Mon Sep 17 00:00:00 2001
From: leventov <leventov@ya.ru>
Date: Sun, 30 Oct 2016 13:47:34 -0600
Subject: [PATCH] Add Throwables utilities, inspired by Guava

---
 .../chronicle/hash/impl/util/Throwables.java  | 48 ++++++++++++
 .../hash/impl/util/ThrowablesTest.java        | 76 +++++++++++++++++++
 2 files changed, 124 insertions(+)
 create mode 100644 src/main/java/net/openhft/chronicle/hash/impl/util/Throwables.java
 create mode 100644 src/test/java/net/openhft/chronicle/hash/impl/util/ThrowablesTest.java

diff --git a/src/main/java/net/openhft/chronicle/hash/impl/util/Throwables.java b/src/main/java/net/openhft/chronicle/hash/impl/util/Throwables.java
new file mode 100644
index 000000000..733ccb44b
--- /dev/null
+++ b/src/main/java/net/openhft/chronicle/hash/impl/util/Throwables.java
@@ -0,0 +1,48 @@
+/*
+ *      Copyright (C) 2012, 2016  higherfrequencytrading.com
+ *      Copyright (C) 2016 Roman Leventov
+ *
+ *      This program is free software: you can redistribute it and/or modify
+ *      it under the terms of the GNU Lesser General Public License as published by
+ *      the Free Software Foundation, either version 3 of the License.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU Lesser General Public License for more details.
+ *
+ *      You should have received a copy of the GNU Lesser General Public License
+ *      along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.openhft.chronicle.hash.impl.util;
+
+/**
+ * Inspired by Guava's Throwables
+ */
+public final class Throwables {
+
+    public static RuntimeException propagate(Throwable t) {
+        Objects.requireNonNull(t);
+        if (t instanceof Error)
+            throw (Error) t;
+        if (t instanceof RuntimeException)
+            throw (RuntimeException) t;
+        throw new RuntimeException(t);
+    }
+
+    public static <T extends Throwable> T propagateNotWrapping(
+            Throwable t, Class<T> notWrappingThrowableType) throws T {
+        Objects.requireNonNull(t);
+        Objects.requireNonNull(notWrappingThrowableType);
+        if (t instanceof Error)
+            throw (Error) t;
+        if (t instanceof RuntimeException)
+            throw (RuntimeException) t;
+        if (notWrappingThrowableType.isInstance(t))
+            throw notWrappingThrowableType.cast(t);
+        throw new RuntimeException(t);
+    }
+
+    private Throwables() {}
+}
diff --git a/src/test/java/net/openhft/chronicle/hash/impl/util/ThrowablesTest.java b/src/test/java/net/openhft/chronicle/hash/impl/util/ThrowablesTest.java
new file mode 100644
index 000000000..63b713f98
--- /dev/null
+++ b/src/test/java/net/openhft/chronicle/hash/impl/util/ThrowablesTest.java
@@ -0,0 +1,76 @@
+/*
+ *      Copyright (C) 2012, 2016  higherfrequencytrading.com
+ *      Copyright (C) 2016 Roman Leventov
+ *
+ *      This program is free software: you can redistribute it and/or modify
+ *      it under the terms of the GNU Lesser General Public License as published by
+ *      the Free Software Foundation, either version 3 of the License.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU Lesser General Public License for more details.
+ *
+ *      You should have received a copy of the GNU Lesser General Public License
+ *      along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.openhft.chronicle.hash.impl.util;
+
+import org.junit.Test;
+
+import java.io.IOException;
+
+@SuppressWarnings("ThrowableResultOfMethodCallIgnored")
+public class ThrowablesTest {
+
+    @Test(expected = NullPointerException.class)
+    public void testPropagateNull() {
+        Throwables.propagate(null);
+    }
+
+    @Test(expected = AssertionError.class)
+    public void testPropagateError() {
+        Throwables.propagate(new AssertionError());
+    }
+
+    @Test(expected = IllegalStateException.class)
+    public void testPropagateUncheckedException() {
+        Throwables.propagate(new IllegalStateException());
+    }
+
+    @Test(expected = RuntimeException.class)
+    public void testPropagateCheckedException() {
+        Throwables.propagate(new IOException());
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void testPropagateNotWrappingNull() throws IOException {
+        Throwables.propagateNotWrapping(null, IOException.class);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void testPropagateNotWrappingNullWrappingType() {
+        Throwables.propagateNotWrapping(new IOException(), null);
+    }
+
+    @Test(expected = AssertionError.class)
+    public void testPropagateNotWrappingError() throws IOException {
+        Throwables.propagateNotWrapping(new AssertionError(), IOException.class);
+    }
+
+    @Test(expected = IllegalStateException.class)
+    public void testPropagateNotWrappingUncheckedException() throws IOException {
+        Throwables.propagateNotWrapping(new IllegalStateException(), IOException.class);
+    }
+
+    @Test(expected = IOException.class)
+    public void testPropagateNotWrappingNotWrappingEException() throws IOException {
+        Throwables.propagateNotWrapping(new IOException(), IOException.class);
+    }
+
+    @Test(expected = RuntimeException.class)
+    public void testPropagateNotWrappingCheckedException() throws IOException {
+        Throwables.propagateNotWrapping(new Exception(), IOException.class);
+    }
+}