Added Support for Instant ParsingStrategy.kt, created Test.

pom.xml

@@ -9,13 +9,13 @@
 	</parent>
 	<groupId>com.sipios</groupId>
 	<artifactId>spring-search</artifactId>
-	<version>0.2.4</version>
+	<version>0.2.5</version>
 	<name>spring-search</name>
 	<description>API for generating spring boot database queries</description>
 
 	<properties>
 		<java.version>1.8</java.version>
-		<kotlin.version>1.4.10</kotlin.version>
+		<kotlin.version>1.6.20</kotlin.version>
 		<antl4.version>4.9</antl4.version>
 		<grammar.package>com.sipios.springsearch.grammar</grammar.package>
 		<grammar.directory>com/sipios/springsearch/grammar</grammar.directory>

src/main/kotlin/com/sipios/springsearch/strategies/InstantStrategy.kt

@@ -0,0 +1,28 @@
+package com.sipios.springsearch.strategies
+
+import com.sipios.springsearch.SearchOperation
+import java.time.Instant
+import javax.persistence.criteria.CriteriaBuilder
+import javax.persistence.criteria.Path
+import javax.persistence.criteria.Predicate
+import kotlin.reflect.KClass
+
+class InstantStrategy : ParsingStrategy {
+    override fun buildPredicate(
+        builder: CriteriaBuilder,
+        path: Path<*>,
+        fieldName: String,
+        ops: SearchOperation?,
+        value: Any?
+    ): Predicate? {
+        return when (ops) {
+            SearchOperation.GREATER_THAN -> builder.greaterThan(path.get(fieldName), value as Instant)
+            SearchOperation.LESS_THAN -> builder.lessThan(path.get(fieldName), value as Instant)
+            else -> super.buildPredicate(builder, path, fieldName, ops, value)
+        }
+    }
+
+    override fun parse(value: String?, fieldClass: KClass<out Any>): Any? {
+        return Instant.parse(value)
+    }
+}

src/main/kotlin/com/sipios/springsearch/strategies/ParsingStrategy.kt

@@ -3,6 +3,7 @@ package com.sipios.springsearch.strategies
 import com.sipios.springsearch.SearchOperation
 import com.sipios.springsearch.anotation.SearchSpec
 import java.time.Duration
+import java.time.Instant
 import java.time.LocalDate
 import java.time.LocalDateTime
 import java.time.LocalTime
@@ -72,6 +73,7 @@ interface ParsingStrategy {
                 fieldClass == LocalDate::class -> LocalDateStrategy()
                 fieldClass == LocalTime::class -> LocalTimeStrategy()
                 fieldClass == LocalDateTime::class -> LocalDateTimeStrategy()
+                fieldClass == Instant::class -> InstantStrategy()
                 fieldClass == UUID::class -> UUIDStrategy()
                 else -> StringStrategy(searchSpecAnnotation)
             }