1 files changed, 72 insertions, 0 deletions
diff --git a/predicate-search-core/src/main/java/com/yahoo/document/predicate/Negation.java b/predicate-search-core/src/main/java/com/yahoo/document/predicate/Negation.java
new file mode 100644
index 00000000000..c5a4cb802ee
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+++ b/predicate-search-core/src/main/java/com/yahoo/document/predicate/Negation.java
@@ -0,0 +1,72 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.document.predicate;
+
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen Hult</a>
+ */
+public class Negation extends PredicateOperator {
+
+    private Predicate operand;
+
+    public Negation(Predicate operand) {
+        Objects.requireNonNull(operand, "operand");
+        this.operand = operand;
+    }
+
+    public Negation setOperand(Predicate operand) {
+        Objects.requireNonNull(operand, "operand");
+        this.operand = operand;
+        return this;
+    }
+
+    public Predicate getOperand() {
+        return operand;
+    }
+
+    @Override
+    public List<Predicate> getOperands() {
+        return java.util.Arrays.asList(operand);
+    }
+
+    @Override
+    public Negation clone() throws CloneNotSupportedException {
+        Negation obj = (Negation)super.clone();
+        obj.operand = operand.clone();
+        return obj;
+    }
+
+    @Override
+    public int hashCode() {
+        return operand.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (!(obj instanceof Negation)) {
+            return false;
+        }
+        Negation rhs = (Negation)obj;
+        if (!operand.equals(rhs.operand)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    protected void appendTo(StringBuilder out) {
+        if (operand instanceof FeatureSet) {
+            ((FeatureSet)operand).appendNegatedTo(out);
+        } else {
+            out.append("not (");
+            operand.appendTo(out);
+            out.append(')');
+        }
+    }
+
+}