Class JDOQLQueryHelper


  • public class JDOQLQueryHelper
    extends java.lang.Object
    JDOQL query helper class providing key information about the language etc.
    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.String getCandidateFromJDOQLString​(java.lang.String query)
      Convenience method to extract the FROM candidate from a JDOQL query string.
      static java.lang.String getJDOQLForExpression​(Expression expr)  
      static boolean isKeyword​(java.lang.String name)
      Convenience method returning if the supplied name is a keyword for this query language.
      static boolean isKeywordExtended​(java.lang.String name)
      Convenience method returning if the supplied name is a keyword for this query language, allowing the DataNucleus extension keywords (UPDATE, DELETE, SET).
      static boolean isValidJavaIdentifierForJDOQL​(java.lang.String s)
      Utility to check if a name is a valid Java identifier.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • SINGLE_STRING_KEYWORDS

        static final java.lang.String[] SINGLE_STRING_KEYWORDS
        Keywords used in single-string JDOQL. Uppercase variants specified here, but we allow the lowercase form.
      • SINGLE_STRING_KEYWORDS_LOWERCASE

        static final java.lang.String[] SINGLE_STRING_KEYWORDS_LOWERCASE
        Keywords in lowercase (we avoid calling toLowerCase() multiple times, which is expensive operation)
      • DYADIC_OP_JDOQL_MAP

        private static final java.util.Map<Expression.Operator,​java.lang.String> DYADIC_OP_JDOQL_MAP
    • Constructor Detail

      • JDOQLQueryHelper

        public JDOQLQueryHelper()
    • Method Detail

      • isKeyword

        public static boolean isKeyword​(java.lang.String name)
        Convenience method returning if the supplied name is a keyword for this query language.
        Parameters:
        name - Name to check
        Returns:
        Whether it is a keyword
      • isKeywordExtended

        public static boolean isKeywordExtended​(java.lang.String name)
        Convenience method returning if the supplied name is a keyword for this query language, allowing the DataNucleus extension keywords (UPDATE, DELETE, SET).
        Parameters:
        name - Name to check
        Returns:
        Whether it is a keyword
      • isValidJavaIdentifierForJDOQL

        public static boolean isValidJavaIdentifierForJDOQL​(java.lang.String s)
        Utility to check if a name is a valid Java identifier. Used by JDOQL in validating the names of parameters/variables.
        Parameters:
        s - The name
        Returns:
        Whether it is a valid identifier in Java.
      • getCandidateFromJDOQLString

        public static java.lang.String getCandidateFromJDOQLString​(java.lang.String query)
        Convenience method to extract the FROM candidate from a JDOQL query string.
        Parameters:
        query - The query string
        Returns:
        The from candidate
      • getJDOQLForExpression

        public static java.lang.String getJDOQLForExpression​(Expression expr)