Publish

1 files changed, 51 insertions, 0 deletions

diff --git a/container-search/src/main/java/com/yahoo/search/grouping/request/InterpolatedLookup.java b/container-search/src/main/java/com/yahoo/search/grouping/request/InterpolatedLookup.java
new file mode 100644
index 00000000000..a49ccdddbbc
--- /dev/null
+++ b/container-search/src/main/java/com/yahoo/search/grouping/request/InterpolatedLookup.java
@@ -0,0 +1,51 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.grouping.request;
+
+import com.google.common.annotations.Beta;
+
+/**
+ * This class represents a lookup in a multivalue document
+ * attribute in a {@link GroupingExpression}.  It takes the
+ * attribute (assumed to contain a sorted array) from the input
+ * {@link com.yahoo.search.result.Hit} and finds the index that
+ * the second (lookup) argument expression would have, with linear
+ * interpolation when the lookup argument is between two array
+ * element values.
+ *
+ * @author arnej27959
+ */
+@Beta
+public class InterpolatedLookup extends DocumentValue {
+
+    private final String attributeName;
+    private final GroupingExpression arg2;
+
+    /**
+     * Constructs a new instance of this class.
+     *
+     * @param attributeName The attribute name the lookup should happen in
+     * @param lookupArg Expression giving a floating-point value for the lookup argument
+     */
+    public InterpolatedLookup(String attributeName, GroupingExpression lookupArg) {
+        super("interpolatedlookup(" + attributeName + ", " + lookupArg + ")");
+        this.attributeName = attributeName;
+	this.arg2 = lookupArg;
+    }
+
+    /**
+     * Get the name of the attribute to be retrieved from the input hit.
+     * @return The attribute name.
+     */
+    public String getAttributeName() {
+        return attributeName;
+    }
+
+    /**
+     * Get the expression that will be evaluated before lookup.
+     * @return grouping expression argument
+     */
+    public GroupingExpression getLookupArgument() {
+	return arg2;
+    }
+
+}