Package org.castor.cpa.persistence.sql.query.visitor

Class DefaultQueryVisitor

java.lang.Object
org.castor.cpa.persistence.sql.query.visitor.DefaultQueryVisitor
All Implemented Interfaces:
Visitor
Direct Known Subclasses:
DefaultDoubleQuoteNameQueryVisitor, SapDbQueryVisitor
public class DefaultQueryVisitor extends Object implements Visitor
Class representing a alias of a specific table or a database.
Version:
$Revision: 8469 $ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $
Author:
Dennis Butterstein, Ralf Joachim

  • Field Details

    • _queryString

      protected final StringBuilder _queryString
      StringBuilder used to append query string.

    • LOG

      protected static final org.apache.commons.logging.Log LOG
      The Jakarta Commons Logging instance used for all logging.

  • Constructor Details

    • DefaultQueryVisitor

      public DefaultQueryVisitor()

  • Method Details

    • visit

      public void visit(Assignment assignment)
      Visit method to handle Assignment elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      assignment - Assignment object to be handled.

    • visit

      public void visit(Delete delete)
      Visit method to handle Delete elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      delete - Delete object to be handled.

    • visit

      public void visit(Insert insert)
      Visit method to handle Insert elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      insert - Insert object to be handled.

    • visit

      public void visit(Join join)
      Visit method to handle Join elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      join - Join object to be handled

    • visit

      public void visit(Select select)
      Visit method to handle select elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      select - Select object to be handled.

    • handleJoinConstruction

      protected final void handleJoinConstruction(Qualifier qualifier)
      Method handling construction of joins. If Processing of joins is delegated to visit(Table) and visit(TableAlias) method we get the problem that they are processed by every class holding qualifier as well (e. g. compare). This behavior can result in an infinite loop.
      Parameters:
      qualifier - Qualifier to process joins from.

    • addTableNames

      protected void addTableNames(Qualifier qualifier)
      Method adding table-names in case of joins. Normal table => Adding table name only, Aliased table => adding table name SPACE table alias.
      Parameters:
      qualifier - Qualifier to add names from

    • visit

      public void visit(Table table)
      Visit method to handle Table elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      table - Table object to be handled.

    • visit

      public void visit(TableAlias tableAlias)
      Visit method to handle TableAlias elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      tableAlias - TableAlias object to be handled.

    • visit

      public void visit(Update update)
      Visit method to handle update elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      update - Update object to be handled.

    • visit

      public void visit(AndCondition andCondition)
      Visit method to handle AndCondition elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      andCondition - AndCondition object to be handled.

    • visit

      public void visit(Compare compare)
      Visit method to handle Compare elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      compare - Compare object to be handled.

    • visit

      public void visit(IsNullPredicate isNullPredicate)
      Visit method to handle IsNullPredicate elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      isNullPredicate - IsNullPredicate object to be handled.

    • visit

      public void visit(OrCondition orCondition)
      Visit method to handle OrCondition elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      orCondition - OrCondition object to be handled.

    • visit

      public void visit(Column column)
      Visit method to handle Column elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      column - Column object to be handled.

    • visit

      public void visit(NextVal nextVal)
      Visit method to handle NextVal elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      nextVal - NextVal object to be handled.

    • visit

      public void visit(Parameter parameter)
      Visit method to handle Parameter elements.
      Specified by:
      visit in interface Visitor
      Parameters:
      parameter - Parameter object to be handled.

    • quoteName

      protected String quoteName(String name)
      Method returning prepared string to match requirements of specific databases if needed.
      Parameters:
      name - String to be prepared.
      Returns:
      Prepared string.

    • getSequenceNextValString

      protected String getSequenceNextValString(String seqName)
      Returns the database engine specific string to fetch sequence next value.
      Parameters:
      seqName - Name of the sequence.
      Returns:
      String to fetch sequence next value.

    • handleLock

      protected void handleLock(Select select)
      Method appending lock clauses as "FOR UPDATE" when needed.
      Parameters:
      select - Select to check if locking-clauses have to be appended or not.

    • toString

      public String toString()
      Method returning constructed String.
      Specified by:
      toString in interface Visitor
      Overrides:
      toString in class Object
      Returns:
      Constructed query string.