ModelBuilder: support indexMaxValueLength.

(cherry picked from commit 4e13480)

Author: greenrobot-team

objectbox-java/src/main/java/io/objectbox/ModelBuilder.java

@@ -63,6 +63,7 @@ public class PropertyBuilder {
         private long uid;
         private int indexId;
         private long indexUid;
+        private int indexMaxValueLength;
 
         PropertyBuilder(String name, @Nullable String targetEntityName, @Nullable String virtualTarget, int type) {
             this.type = type;
@@ -85,6 +86,12 @@ public PropertyBuilder indexId(int indexId, long indexUid) {
             return this;
         }
 
+        public PropertyBuilder indexMaxValueLength(int indexMaxValueLength) {
+            checkNotFinished();
+            this.indexMaxValueLength = indexMaxValueLength;
+            return this;
+        }
+
         public PropertyBuilder flags(int flags) {
             checkNotFinished();
             this.flags = flags;
@@ -125,6 +132,9 @@ public int finish() {
                 int indexIdOffset = IdUid.createIdUid(fbb, indexId, indexUid);
                 ModelProperty.addIndexId(fbb, indexIdOffset);
             }
+            if (indexMaxValueLength > 0) {
+                ModelProperty.addMaxIndexValueLength(fbb, indexMaxValueLength);
+            }
             ModelProperty.addType(fbb, type);
             if (flags != 0) {
                 ModelProperty.addFlags(fbb, flags);