[GitHub] [lucene-solr] kwatters commented on a change in pull request #1954: SOLR-14787 - Adding support to use inequalities to the payload check query parser.

[GitBox <gi...@apache.org>]

kwatters commented on a change in pull request #1954:
URL: https://github.com/apache/lucene-solr/pull/1954#discussion_r552863407



##########
File path: lucene/queries/src/java/org/apache/lucene/queries/payloads/PayloadMatcherFactory.java
##########
@@ -0,0 +1,243 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.lucene.queries.payloads;
+
+import java.nio.charset.StandardCharsets;
+import java.util.HashMap;
+
+import org.apache.lucene.queries.payloads.SpanPayloadCheckQuery.PayloadType;
+import org.apache.lucene.util.BytesRef;
+
+/**
+ * Creates a payload matcher object based on a payload type and an operation.
+ * PayloadTypes of INT,FLOAT, or STRING are supported.  Inequality operations are supported.
+ */
+public class PayloadMatcherFactory {
+
+  private static final HashMap<PayloadType, HashMap<String, PayloadMatcher>> payloadCheckerOpTypeMap;
+  static {
+    payloadCheckerOpTypeMap= new HashMap<PayloadType, HashMap<String, PayloadMatcher>>();
+    // ints
+    HashMap<String, PayloadMatcher> intCheckers = new HashMap<String, PayloadMatcher>();
+    intCheckers.put("lt", new LTIntPayloadMatcher());
+    intCheckers.put("lte", new LTEIntPayloadMatcher());
+    intCheckers.put("gt", new GTIntPayloadMatcher());
+    intCheckers.put("gte", new GTEIntPayloadMatcher());
+    HashMap<String, PayloadMatcher> floatCheckers = new HashMap<String, PayloadMatcher>();
+    floatCheckers.put("lt", new LTFloatPayloadMatcher());
+    floatCheckers.put("lte", new LTEFloatPayloadMatcher());
+    floatCheckers.put("gt", new GTFloatPayloadMatcher());
+    floatCheckers.put("gte", new GTEFloatPayloadMatcher());
+    // strings
+    HashMap<String, PayloadMatcher> stringCheckers = new HashMap<String, PayloadMatcher>();
+    stringCheckers.put("lt", new LTStringPayloadMatcher());
+    stringCheckers.put("lte", new LTEStringPayloadMatcher());
+    stringCheckers.put("gt", new GTStringPayloadMatcher());
+    stringCheckers.put("gte", new GTEStringPayloadMatcher());
+    // load the matcher maps per payload type
+    payloadCheckerOpTypeMap.put(PayloadType.INT, intCheckers);
+    payloadCheckerOpTypeMap.put(PayloadType.FLOAT, floatCheckers);
+    payloadCheckerOpTypeMap.put(PayloadType.STRING, stringCheckers);
+  }
+  
+  /**
+   * Return a payload matcher for use in the SpanPayloadCheckQuery that will decode the ByteRef from 
+   * a payload based on the payload type, and apply a matching inequality operations (eq,lt,lte,gt,and gte)
+   * 
+   * @param payloadType the type of the payload to decode, STRING, INT, FLOAT
+   * @param op and inequalit operation as the test (example: eq for equals, gt for greater than)
+   * @return a payload matcher that decodes the payload and applies the operation inequality test.
+   * 
+   */
+  public static PayloadMatcher createMatcherForOpAndType(PayloadType payloadType, String op) {
+    // special optimization, binary/byte comparison
+    if (op == null || "eq".contentEquals(op)) {
+      return new EQPayloadMatcher();
+    }
+    // otherwise, we need to pay attention to the payload type and operation
+    return payloadCheckerOpTypeMap.get(payloadType).get(op);

Review comment:
       added a null test to default to unknown operations resulting in an equality comparison.




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