From 4e4ebd89421a330f33723d24f93908e221736c56 Mon Sep 17 00:00:00 2001
From: "Jesus M. Castagnetto" <jesus@upch.pe>
Date: Tue, 4 Jun 2013 15:52:41 -0500
Subject: [PATCH] restore Xor.java content, removed in a botched commit

---
 .../refine/expr/functions/booleans/Xor.java   | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/main/src/com/google/refine/expr/functions/booleans/Xor.java b/main/src/com/google/refine/expr/functions/booleans/Xor.java
index e69de29bb..72fdb1e16 100644
--- a/main/src/com/google/refine/expr/functions/booleans/Xor.java
+++ b/main/src/com/google/refine/expr/functions/booleans/Xor.java
@@ -0,0 +1,65 @@
+/*
+Copyright (c) 2013, Jesus M. Castagnetto
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+- Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package com.google.refine.expr.functions.booleans;
+
+import java.util.Properties;
+
+import org.json.JSONException;
+import org.json.JSONWriter;
+
+import com.google.refine.expr.EvalError;
+import com.google.refine.grel.ControlFunctionRegistry;
+import com.google.refine.grel.Function;
+
+public class Xor implements Function {
+
+    /* naive implementation of the XOR operation */
+    @Override
+    public Object call(Properties bindings, Object[] args) {
+        if (args.length == 2 && 
+                args[0] != null && args[0] instanceof Boolean && 
+                args[1] != null && args[0] instanceof Boolean) {
+            boolean o1 = ((Boolean) args[0]).booleanValue();
+            boolean o2 = ((Boolean) args[1]).booleanValue();
+            return o1 != o2;
+        }
+        return new EvalError(ControlFunctionRegistry.getFunctionName(this) + " expects 2 booleans");
+    }
+
+    @Override
+    public void write(JSONWriter writer, Properties options)
+            throws JSONException {
+
+        writer.object();
+        writer.key("description");
+        writer.value("XORs two boolean values");
+        writer.key("params");
+        writer.value("boolean a, boolean b");
+        writer.key("returns");
+        writer.value("boolean");
+        writer.endObject();
+    }
+}