DATAMONGO-1530 - Add support for missing MongoDB 3.2 aggregation pipeline operators.

Original Pull Request: #410

Author: sebge2emasphere

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/spel/MethodReferenceNode.java

@@ -15,32 +15,89 @@
  */
 package org.springframework.data.mongodb.core.spel;
 
+import org.springframework.expression.spel.ExpressionState;
+import org.springframework.expression.spel.ast.MethodReference;
+
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
-import org.springframework.expression.spel.ExpressionState;
-import org.springframework.expression.spel.ast.MethodReference;
-
 /**
  * An {@link ExpressionNode} representing a method reference.
- * 
+ *
  * @author Oliver Gierke
  * @author Thomas Darimont
+ * @author Sebastien Gerard
  */
 public class MethodReferenceNode extends ExpressionNode {
 
 	private static final Map<String, String> FUNCTIONS;
 
 	static {
-
 		Map<String, String> map = new HashMap<String, String>();
 
+		map.put("and", "$and"); // Returns true only when all its expressions evaluate to true.
+		map.put("or", "$or"); // Returns true when any of its expressions evaluates to true.
+		map.put("not", "$not"); // Returns the boolean value that is the opposite of its argument expression.
+
+		map.put("setEquals", "$setEquals"); // Returns true if the input sets have the same distinct elements.
+		map.put("setIntersection", "$setIntersection"); // Returns a set with elements that appear in all of the input sets.
+		map.put("setUnion", "$setUnion"); // Returns a set with elements that appear in any of the input sets.
+		map.put("setDifference", "$setDifference"); // Returns a set with elements that appear in the 1st set but not in the
+		// 2nd.
+		map.put("setIsSubset", "$setIsSubset"); // Returns true if all elements of the 1st set appear in the 2nd set.
+		map.put("anyElementTrue", "$anyElementTrue"); // Returns whether any elements of a set evaluate to true.
+		map.put("allElementsTrue", "$allElementsTrue"); // Returns whether no element of a set evaluates to false.
+
+		map.put("cmp", "$cmp"); // Returns: 0 if the two values are equivalent, 1 if the first value is greater than the
+		// second, and -1 if the first value is less than the second.
+		map.put("eq", "$eq"); // Returns true if the values are equivalent.
+		map.put("gt", "$gt"); // Returns true if the first value is greater than the second.
+		map.put("gte", "$gte"); // Returns true if the first value is greater than or equal to the second.
+		map.put("lt", "$lt"); // Returns true if the first value is less than the second.
+		map.put("lte", "$lte"); // Returns true if the first value is less than or equal to the second.
+		map.put("ne", "$ne"); // Returns true if the values are not equivalent.
+
+		map.put("abs", "$abs"); // Returns the absolute value of a number.;
+		map.put("add", "$add"); // Adds numbers to return the sum, or adds numbers and a date to return a new date.
+		map.put("ceil", "$ceil"); // Returns the smallest integer greater than or equal to the specified number.
+		map.put("divide", "$divide"); // Returns the result of dividing the first number by the second.
+		map.put("exp", "$exp"); // Raises e to the specified exponent.
+		map.put("floor", "$floor"); // Returns the largest integer less than or equal to the specified number.
+		map.put("ln", "$ln"); // Calculates the natural log of a number.
+		map.put("log", "$log"); // Calculates the log of a number in the specified base.
+		map.put("log10", "$log10"); // Calculates the log base 10 of a number.
+		map.put("mod", "$mod"); // Returns the remainder of the first number divided by the second.
+		map.put("multiply", "$multiply"); // Multiplies numbers to return the product.
+		map.put("pow", "$pow"); // Raises a number to the specified exponent.
+		map.put("sqrt", "$sqrt"); // Calculates the square root.
+		map.put("subtract", "$subtract"); // Returns the result of subtracting the second value from the first. If the
+		// two values are numbers, return the difference. If the two values are dates, return the difference in
+		// milliseconds.
+		map.put("trunc", "$trunc"); // Truncates a number to its integer.
+
 		map.put("concat", "$concat"); // Concatenates two strings.
-		map.put("strcasecmp", "$strcasecmp"); // Compares two strings and returns an integer that reflects the comparison.
 		map.put("substr", "$substr"); // Takes a string and returns portion of that string.
 		map.put("toLower", "$toLower"); // Converts a string to lowercase.
 		map.put("toUpper", "$toUpper"); // Converts a string to uppercase.
+		map.put("strcasecmp", "$strcasecmp"); // Compares two strings and returns an integer that reflects the comparison.
+
+		map.put("meta", "$meta"); // Access text search metadata.
+
+		map.put("arrayElemAt", "$arrayElemAt"); // Returns the element at the specified array index.
+		map.put("concatArrays", "$concatArrays"); // Concatenates arrays to return the concatenated array.
+		map.put("filter", "$filter"); // Selects a subset of the array to return an array with only the elements that
+		// match the filter condition.
+		map.put("isArray", "$isArray"); // Determines if the operand is an array. Returns a boolean.
+		map.put("size", "$size"); // Returns the number of elements in the array.
+		map.put("slice", "$slice"); // Returns a subset of an array.
+
+		map.put("map", "$map"); // Applies a subexpression to each element of an array and returns the array of
+		// resulting values in order.
+		map.put("let", "$let"); // Defines variables for use within the scope of a subexpression and returns the result
+		// of the subexpression.
+
+		map.put("literal", "$literal"); // Return a value without parsing.
 
 		map.put("dayOfYear", "$dayOfYear"); // Converts a date to a number between 1 and 366.
 		map.put("dayOfMonth", "$dayOfMonth"); // Converts a date to a number between 1 and 31.
@@ -53,6 +110,13 @@ public class MethodReferenceNode extends ExpressionNode {
 		map.put("second", "$second"); // Converts a date into a number between 0 and 59. May be 60 to account for leap
 		// seconds.
 		map.put("millisecond", "$millisecond"); // Returns the millisecond portion of a date as an integer between 0 and
+		// 999.
+		map.put("dateToString", "$dateToString"); // Returns the date as a formatted string.
+
+		map.put("cond", "$cond"); // A ternary operator that evaluates one expression, and depending on the result,
+		// returns the value of one of the other two expressions.
+		map.put("ifNull", "$ifNull"); // Returns either the non-null result of the first expression or the result of the
+		// second expression if the first expression results in a null result.
 
 		FUNCTIONS = Collections.unmodifiableMap(map);
 	}
@@ -63,11 +127,8 @@ public class MethodReferenceNode extends ExpressionNode {
 
 	/**
 	 * Returns the name of the method.
-	 * 
-	 * @return
 	 */
 	public String getMethodName() {
-
 		String name = getName();
 		String methodName = name.substring(0, name.indexOf('('));
 		return FUNCTIONS.get(methodName);

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/spel/OperatorNode.java

@@ -29,7 +29,7 @@
 
 /**
  * An {@link ExpressionNode} representing an operator.
- * 
+ *
  * @author Oliver Gierke
  * @author Thomas Darimont
  */
@@ -47,14 +47,18 @@ public class OperatorNode extends ExpressionNode {
 		map.put("/", "$divide");
 		map.put("%", "$mod");
 
+		map.put("and", "and");
+		map.put("or", "or");
+		map.put("!", "not");
+
 		OPERATORS = Collections.unmodifiableMap(map);
 	}
 
 	private final Operator operator;
 
 	/**
 	 * Creates a new {@link OperatorNode} from the given {@link Operator} and {@link ExpressionState}.
-	 * 
+	 *
 	 * @param node must not be {@literal null}.
 	 * @param state must not be {@literal null}.
 	 */