1 files changed, 87 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/prelude/query/StringInItem.java b/container-search/src/main/java/com/yahoo/prelude/query/StringInItem.java
new file mode 100644
index 00000000000..ebcf0de1a21
--- /dev/null
+++ b/container-search/src/main/java/com/yahoo/prelude/query/StringInItem.java
@@ -0,0 +1,87 @@
+// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.prelude.query;
+
+import com.yahoo.compress.IntegerCompressor;
+
+import java.nio.ByteBuffer;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+
+/*
+ * Class representing an IN operator with a set of string values.
+ *
+ * @author toregge
+ */
+public class StringInItem extends InItem {
+    private Set<String> tokens;
+
+    public StringInItem(String indexName) {
+        super(indexName);
+        tokens = new HashSet<>(1000);
+    }
+
+    @Override
+    public ItemType getItemType() {
+        return ItemType.STRING_IN;
+    }
+
+    @Override
+    public int encode(ByteBuffer buffer) {
+        encodeThis(buffer);
+        return 1;
+    }
+
+    @Override
+    protected void encodeThis(ByteBuffer buffer) {
+        super.encodeThis(buffer);
+        IntegerCompressor.putCompressedPositiveNumber(tokens.size(), buffer);
+        putString(getIndexName(), buffer);
+        for (var entry : tokens) {
+            putString(entry, buffer);
+        }
+    }
+
+    @Override
+    public int getTermCount() {
+        return 1;
+    }
+
+    @Override
+    protected void appendBodyString(StringBuilder buffer) {
+        buffer.append(getIndexName());
+        buffer.append("{");
+        for (var entry : tokens) {
+            buffer.append("\"");
+            buffer.append(entry);
+            buffer.append("\",");
+        }
+        if (!tokens.isEmpty()) {
+            buffer.deleteCharAt(buffer.length() - 1); // remove extra ","
+        }
+        buffer.append("}");
+    }
+
+    public void addToken(String token) {
+        Objects.requireNonNull(token, "Token string must not be null");
+        tokens.add(token);
+    }
+
+    public Collection<String> getTokens() { return Set.copyOf(tokens); }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o == this) return true;
+        if ( ! super.equals(o)) return false;
+        var other = (StringInItem)o;
+        if ( ! Objects.equals(this.tokens, other.tokens)) return false;
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), tokens);
+    }
+
+}