Examples of org.hibernate.dialect.function.SQLFunction

org.hibernate.dialect.function.SQLFunction
Provides support routines for the HQL functions as used in the various SQL Dialects Provides an interface for supporting various HQL functions that are translated to SQL. The Dialect and its sub-classes use this interface to provide details required for processing of the function. @author David Channon

   * @param functionName The name of the function to locate
   * @return The sql function.
   * @throws QueryException Indicates no matching sql functions could be found.
   */
  private SQLFunction requireSQLFunction(String functionName) {
    SQLFunction f = findSQLFunction( functionName );
    if ( f == null ) {
      throw new QueryException( "Unable to find SQL function: " + functionName );
    }
    return f;
  }

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   * @param first        The first argument expression.
   * @return the function return type given the function name and the first argument expression node.
   */
  public Type findFunctionReturnType(String functionName, AST first) {
    // locate the registered function by the given name
    SQLFunction sqlFunction = requireSQLFunction( functionName );


    // determine the type of the first argument...
    Type argumentType = null;
    if ( first != null ) {
      if ( "cast".equals(functionName) ) {
        argumentType = TypeFactory.heuristicType( first.getNextSibling().getText() );
      }
      else if ( first instanceof SqlNode ) {
        argumentType = ( (SqlNode) first ).getDataType();
      }
    }


    return sqlFunction.getReturnType( argumentType, sfi );
  }

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    }
  }


  protected void beginFunctionTemplate(AST m, AST i) {
    MethodNode methodNode = ( MethodNode ) m;
    SQLFunction template = methodNode.getSQLFunction();
    if ( template == null ) {
      // if template is null we just write the function out as it appears in the hql statement
      super.beginFunctionTemplate( m, i );
    }
    else {

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    }
  }


  protected void endFunctionTemplate(AST m) {
    MethodNode methodNode = ( MethodNode ) m;
    SQLFunction template = methodNode.getSQLFunction();
    if ( template == null ) {
      super.endFunctionTemplate( m );
    }
    else {
      // this function has a template -> restore output, apply the template and write the result out
      FunctionArguments functionArguments = ( FunctionArguments ) writer;   // TODO: Downcast to avoid using an interface?  Yuck.
      writer = ( SqlWriter ) outputStack.removeFirst();
      out( template.render( functionArguments.getArgs(), sessionFactory ) );
    }
  }

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    // checking for "(" is currently redundant because it is checked before getting here;
    // doing the check anyhow, in case that earlier check goes away;
    if ( "(".equals( nextToken ) ) {
      return true;
    }
    SQLFunction function = functionRegistry.findSQLFunction(lcToken);
    if ( function == null ) {
      // lcToken does not refer to a function
      return false;
    }
    // if function.hasParenthesesIfNoArguments() is true, then assume
    // lcToken is not a function (since it is not followed by '(')
    return ! function.hasParenthesesIfNoArguments();
  }

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  protected SQLFunction getFunction(CriteriaQuery criteriaQuery) {
    return getFunction( getFunctionName(), criteriaQuery );
  }


  protected SQLFunction getFunction(String functionName, CriteriaQuery criteriaQuery) {
    final SQLFunction function = criteriaQuery.getFactory()
        .getSqlFunctionRegistry()
        .findSQLFunction( functionName );
    if ( function == null ) {
      throw new HibernateException( "Unable to locate mapping for function named [" + functionName + "]" );
    }

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    return getFunction( criteriaQuery ).render( null, ARGS, criteriaQuery.getFactory() ) + " as y" + position + '_';
  }


  protected SQLFunction getFunction(CriteriaQuery criteriaQuery) {
    final SQLFunctionRegistry sqlFunctionRegistry = criteriaQuery.getFactory().getSqlFunctionRegistry();
    final SQLFunction function = sqlFunctionRegistry.findSQLFunction( "count" );
    if ( function == null ) {
      throw new HibernateException( "Unable to locate count function mapping" );
    }
    return function;
  }

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  @Override
  protected void beginFunctionTemplate(AST node, AST nameNode) {
    // NOTE for AGGREGATE both nodes are the same; for METHOD the first is the METHOD, the second is the
    //     METHOD_NAME
    FunctionNode functionNode = (FunctionNode) node;
    SQLFunction sqlFunction = functionNode.getSQLFunction();
    if ( sqlFunction == null ) {
      // if SQLFunction is null we just write the function out as it appears in the hql statement
      super.beginFunctionTemplate( node, nameNode );
    }
    else {

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  }


  @Override
  protected void endFunctionTemplate(AST node) {
    FunctionNode functionNode = (FunctionNode) node;
    SQLFunction sqlFunction = functionNode.getSQLFunction();
    if ( sqlFunction == null ) {
      super.endFunctionTemplate( node );
    }
    else {
      final Type functionType = functionNode.getFirstArgumentType();
      // this function has a registered SQLFunction -> redirect output and catch the arguments
      FunctionArguments functionArguments = (FunctionArguments) writer;
      writer = outputStack.removeFirst();
      out( sqlFunction.render( functionType, functionArguments.getArgs(), sessionFactory ) );
    }
  }

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   * @return The sql function.
   *
   * @throws QueryException Indicates no matching sql functions could be found.
   */
  private SQLFunction requireSQLFunction(String functionName) {
    SQLFunction f = findSQLFunction( functionName );
    if ( f == null ) {
      throw new QueryException( "Unable to find SQL function: " + functionName );
    }
    return f;
  }

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