1 files changed, 108 insertions, 0 deletions
diff --git a/predicate-search/src/main/java/com/yahoo/search/predicate/serialization/PredicateQuerySerializer.java b/predicate-search/src/main/java/com/yahoo/search/predicate/serialization/PredicateQuerySerializer.java
new file mode 100644
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+++ b/predicate-search/src/main/java/com/yahoo/search/predicate/serialization/PredicateQuerySerializer.java
@@ -0,0 +1,108 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.predicate.serialization;
+
+import com.fasterxml.jackson.core.JsonFactory;
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.yahoo.search.predicate.PredicateQuery;
+import com.yahoo.search.predicate.PredicateQueryParser;
+import com.yahoo.search.predicate.SubqueryBitmap;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.util.List;
+
+import static java.util.stream.Collectors.toList;
+
+/**
+ * Converts {@link PredicateQuery} to and from JSON
+ *
+ * Example:
+ *  {
+ *      features: [
+ *          {"k": "key-name", "v":"value", "s":"0xDEADBEEFDEADBEEF"}
+ *      ],
+ *      rangeFeatures: [
+ *          {"k": "key-name", "v":42, "s":"0xDEADBEEFDEADBEEF"}
+ *      ]
+ *  }
+ *
+ * @author bjorncs
+ */
+public class PredicateQuerySerializer {
+    private final JsonFactory factory = new JsonFactory();
+    private final PredicateQueryParser parser = new PredicateQueryParser();
+
+    public String toJSON(PredicateQuery query) {
+        try {
+            StringWriter writer = new StringWriter(1024);
+            toJSON(query, writer);
+            return writer.toString();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void toJSON(PredicateQuery query, Writer writer) throws IOException {
+        try (JsonGenerator g = factory.createGenerator(writer)) {
+            g.writeStartObject();
+
+            // Write features
+            g.writeArrayFieldStart("features");
+            for (PredicateQuery.Feature feature : query.getFeatures()) {
+                writeFeature(feature.key, feature.value, feature.subqueryBitmap, g, JsonGenerator::writeStringField);
+            }
+            g.writeEndArray();
+
+            // Write rangeFeatures
+            g.writeArrayFieldStart("rangeFeatures");
+            for (PredicateQuery.RangeFeature rangeFeature : query.getRangeFeatures()) {
+                writeFeature(rangeFeature.key, rangeFeature.value, rangeFeature.subqueryBitmap, g,
+                        JsonGenerator::writeNumberField);
+            }
+            g.writeEndArray();
+
+            g.writeEndObject();
+        }
+    }
+
+    private static <T> void writeFeature(
+            String key, T value, long subqueryBitmap, JsonGenerator g, ValueWriter<T> valueWriter)
+            throws IOException {
+
+        g.writeStartObject();
+        g.writeStringField("k", key);
+        valueWriter.write(g, "v", value);
+        if (subqueryBitmap != SubqueryBitmap.DEFAULT_VALUE) {
+            g.writeStringField("s", toHexString(subqueryBitmap));
+        }
+        g.writeEndObject();
+    }
+
+    @FunctionalInterface
+    private interface ValueWriter<T> {
+        void write(JsonGenerator g, String key, T value) throws IOException;
+    }
+
+    public PredicateQuery fromJSON(String json) {
+        PredicateQuery query = new PredicateQuery();
+        parser.parseJsonQuery(json, query::addFeature, query::addRangeFeature);
+        return query;
+    }
+
+    public static List<PredicateQuery> parseQueriesFromFile(String queryFile, int maxQueryCount) throws IOException {
+        PredicateQuerySerializer serializer = new PredicateQuerySerializer();
+        try (BufferedReader reader = new BufferedReader(new FileReader(queryFile), 8 * 1024)) {
+            return reader.lines()
+                    .limit(maxQueryCount)
+                    .map(serializer::fromJSON)
+                    .collect(toList());
+        }
+    }
+
+    private static String toHexString(long subqueryBitMap) {
+        return "0x" + Long.toHexString(subqueryBitMap);
+    }
+}