1 files changed, 68 insertions, 0 deletions
diff --git a/indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/HexDecodeExpression.java b/indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/HexDecodeExpression.java
new file mode 100644
index 00000000000..11e58883b27
--- /dev/null
+++ b/indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/HexDecodeExpression.java
@@ -0,0 +1,68 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.vespa.indexinglanguage.expressions;
+
+import com.yahoo.document.DataType;
+import com.yahoo.document.DocumentType;
+import com.yahoo.document.datatypes.LongFieldValue;
+
+import java.math.BigInteger;
+
+/**
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
+ */
+public class HexDecodeExpression extends Expression {
+
+    private static final BigInteger ULONG_MAX = new BigInteger("18446744073709551616");
+
+    @Override
+    protected void doExecute(ExecutionContext ctx) {
+        String input = String.valueOf(ctx.getValue());
+        if (input.isEmpty()) {
+            ctx.setValue(new LongFieldValue(Long.MIN_VALUE));
+            return;
+        }
+        BigInteger output;
+        try {
+            output = new BigInteger(input, 16);
+        } catch (NumberFormatException e) {
+            throw new NumberFormatException("Illegal hex value '" + input + "'.");
+        }
+        if (output.bitLength() > 64) {
+            throw new NumberFormatException("Hex value '" + input + "' is out of range.");
+        }
+        if (output.compareTo(BigInteger.ZERO) == 1 && output.bitLength() == 64) {
+            output = output.subtract(ULONG_MAX); // flip to negative
+        }
+        ctx.setValue(new LongFieldValue(output.longValue()));
+    }
+
+    @Override
+    protected void doVerify(VerificationContext ctx) {
+        ctx.setValue(createdOutputType());
+    }
+
+    @Override
+    public DataType requiredInputType() {
+        return DataType.STRING;
+    }
+
+    @Override
+    public DataType createdOutputType() {
+        return DataType.LONG;
+    }
+
+    @Override
+    public String toString() {
+        return "hexdecode";
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof HexDecodeExpression;
+    }
+
+    @Override
+    public int hashCode() {
+        return getClass().hashCode();
+    }
+}