When using https://github.com/goldmansachs/reladomo Reladomo, queries are usually expressed using its code-generated Finder language. java Operation operation = MyTypeFinder.optionalString().eq("value") .and(MyTypeFinder.optionalInteger().eq(4)); MyTypeList mithraList = MyTypeFinder.findMany(operation); In some situations, it can be useful to have a more dynamic way of expressing queries.That's where ReladomoOperationCompiler comes in. It can take a String and compile it into a Reladomo https://www.mvndoc.com/c/com.goldmansachs.reladomo/reladomo/com/gs/fw/finder/Operation.html Operation.In this example, this.stringProperty = "value" & this.integerProperty = 4 is the equivalent query.This can be used for dynamic ad-hoc queries, and combines well with graphql/bundle.md Liftwizard's GraphQL features. java MyTypeFinder finder = MyTypeFinder.getFinderInstance(); var operationText = "this.stringProperty = \"value\" & this.integerProperty = 4"; var compiler = new ReladomoOperationCompiler(); Operation operation = compiler.compile(finder, operationText); MyTypeList mithraList = MyTypeFinder.findMany(operation); Compiling toString() representation The syntax closely matches the toString() representation of Reladomo's Operations, with a little added flexibility. In general, you can call operation.toString() and compile the output to get back an equivalent Operation. java Operation operation = ...; String operationText = operation.toString(); Operation recompiled = compiler.compile(finder, operationText); assertThat(recompiled, is(operation)); Error messages The compiler is designed to give helpful error messages on inputs that parse but don't compile.For example, running the compiler on this.invalidAttributeName = "Value" might throw an error like: Could not find attribute 'invalidAttributeName' on type 'MyType' in this.invalidAttributeName = "Value". Valid attributes: [idProperty, stringProperty, integerProperty, longProperty, doubleProperty, floatProperty, booleanProperty, instantProperty, localDateProperty, createdById, createdOn, lastUpdatedById, systemFrom, systemTo] Flexible syntax The compiler allows some flexibility in the syntax. toString() Alternatives `&` `&&`, `and` `|` `||`, `or` `<class name>` `this` `lower` `toLowerCase` `abs` `absoluteValue` `=` `==`, `eq` `!=` `not eq`, `notEq` `>` `greaterThan` `>=` `greaterThanEquals` `<` `lessThan` `<=` `lessThanEquals` `not in` `notIn` `not startsWith` `notStartsWith` `not endsWith` `notEndsWith` `not contains` `notContains` `not wildCardEquals` `wildCardNotEquals` `all of <class name>` `all` `is null` `== null` `is not null` `!= null` `all of <class name}` `all` Complete examples # Attribute types this.booleanProperty = true this.integerProperty = 4 this.longProperty = 5 this.floatProperty = 6.6 this.doubleProperty = 7.7 this.dateProperty = "2010-12-31" this.timeProperty = "2010-12-31T23:59:00.0Z" this.stringProperty = "Value" this.system = "2010-12-31T23:59:00.0Z" # Conjunctions this.booleanProperty = true & this.integerProperty = 4 this.booleanProperty = true && this.integerProperty = 4 this.booleanProperty = true and this.integerProperty = 4 this.booleanProperty = true | this.integerProperty = 4 this.booleanProperty = true || this.integerProperty = 4 this.booleanProperty = true or this.integerProperty = 4 # Equality operators this.stringProperty = "Value" this.stringProperty != "Value" this.stringProperty is null this.stringProperty == null this.stringProperty is not null this.stringProperty != null this.stringProperty in ["Value", "Value2", null] this.stringProperty not in ["Value", "Value2", null] # String operators this.stringProperty endsWith "Value" this.stringProperty contains "Value" this.stringProperty startsWith "Value" this.stringProperty wildCardEquals "Value?" this.stringProperty not endsWith "Value" this.stringProperty not contains "Value" this.stringProperty not startsWith "Value" this.stringProperty not wildCardEquals "Value?" # Numeric operators this.stringProperty > "Value" this.stringProperty >= "Value" this.stringProperty < "Value" this.stringProperty <= "Value" # Functions / derived attributes toLowerCase(this.stringProperty) = "value" substring(this.stringProperty, 2, 3) = "value" substring(toLowerCase(this.stringProperty), 2, 3) = "value" # Flexible number literals this.floatProperty = 42.0f this.floatProperty = 42.0d this.floatProperty = 42 this.doubleProperty = 42.0f this.doubleProperty = 42.0d this.doubleProperty = 42 this.longProperty = 10_000_000_000 this.integerProperty = 1_000_000_000 # Number / date functions / derived attributes abs(this.integerProperty) = 1 year(this.timeProperty) = 1999 month(this.timeProperty) = 12 dayOfMonth(this.timeProperty) = 31 year(this.dateProperty) = 1999 month(this.dateProperty) = 12 dayOfMonth(this.dateProperty) = 31 # Relationships this.target.value = "value" this.target exists this.target not exists this.target { RelatedType.source.value = "value" } not exists # Edge points this.system equalsEdgePoint