Package org.datanucleus.store.query.expression

Class ExpressionCompiler

  • public class ExpressionCompiler
extends java.lang.Object
    Compiler for expressions. Responsible for taking a Node tree and creating an Expression tree.

    • Field Detail

      • aliasByPrefix

        java.util.Map<java.lang.String,​java.lang.String> aliasByPrefix

    • Constructor Detail

      • ExpressionCompiler

        public ExpressionCompiler()

    • Method Detail

      • setMethodAliases

        public void setMethodAliases​(java.util.Map<java.lang.String,​java.lang.String> aliasByPrefix)

      • setSymbolTable

        public void setSymbolTable​(SymbolTable symtbl)

      • compileOrderExpression

        public Expression compileOrderExpression​(Node node)
        Primary entry point for compiling a node for the order clause.
        Parameters:
        node - The node
        Returns:
        Its compiled expression

      • compileFromExpression

        public Expression compileFromExpression​(Node node,
                                        boolean classIsExpression)
        Primary entry point for compiling a node for the from clause.
        Parameters:
        node - The node
        classIsExpression - whether the class of the from node is an expression relating to the outer query
        Returns:
        Its compiled expression

      • compileExpression

        public Expression compileExpression​(Node node)
        Primary entry point for compiling a node for the filter, grouping, having, result clauses.
        Parameters:
        node - The node
        Returns:
        Its compiled expression

      • compileOrAndExpression

        private Expression compileOrAndExpression​(Node node)
        This method deals with the OR/AND conditions. A condition specifies a combination of one or more expressions and logical (Boolean) operators and returns a value of TRUE, FALSE, or unknown
        Parameters:
        node - The Node to process

      • compileRelationalExpression

        private Expression compileRelationalExpression​(Node node)

      • compileAdditiveMultiplicativeExpression

        private Expression compileAdditiveMultiplicativeExpression​(Node node)

      • compileUnaryExpression

        private Expression compileUnaryExpression​(Node node)

      • compilePrimaryExpression

        private Expression compilePrimaryExpression​(Node node)

      • getExpressionsForPropertiesOfNode

        private java.util.List<Expression> getExpressionsForPropertiesOfNode​(Node node)
        Convenience method to extract properties for this node and return the associated list of expressions.
        Parameters:
        node - The node
        Returns:
        The list of expressions for the properties (or null if no properties)

      • isOperator

        private boolean isOperator​(Node node,
                           java.lang.String operator)