Package com.mckoi.database.interpret

Class FromClause

java.lang.Object
com.mckoi.database.interpret.FromClause
All Implemented Interfaces:
StatementTreeObject, Serializable, Cloneable
public final class FromClause extends Object implements Serializable, StatementTreeObject, Cloneable
A container for the From clause of a select statement. This handles the different types of joins.
Author:
Tobias Downer
See Also:

  • Constructor Details

    • FromClause

      public FromClause()

  • Method Details

    • addTable

      public void addTable(String table_name)
      Adds a table name to this FROM clause. Note that the given name may be a dot deliminated ref such as (schema.table_name).

    • addTable

      public void addTable(String table_name, String table_alias)
      Adds a table name + alias to this FROM clause.

    • addTableDeclaration

      public void addTableDeclaration(String table_name, TableSelectExpression select, String table_alias)
      A generic form of a table declaration. If any parameters are 'null' it means the information is not available.

    • addJoin

      public void addJoin(int type)
      Adds a Join to the from clause. 'type' must be a join type as defined in JoiningSet.

    • addPreviousJoin

      public void addPreviousJoin(int type, Expression on_expression)
      Hack, add a joining type to the previous entry from the end. This is an artifact of how joins are parsed.

    • addJoin

      public void addJoin(int type, Expression on_expression)
      Adds a Join to the from clause. 'type' must be a join type as defined in JoiningSet, and expression represents the ON condition.

    • getJoinSet

      public JoiningSet getJoinSet()
      Returns the JoiningSet object for the FROM clause.

    • getJoinType

      public int getJoinType(int n)
      Returns the type of join after table 'n' in the set of tables in the from clause. Returns, JoiningSet.INNER_JOIN, JoiningSet.FULL_OUTER_JOIN, etc.

    • getOnExpression

      public Expression getOnExpression(int n)
      Returns the ON Expression for the type of join after table 'n' in the set.

    • allTables

      public Collection allTables()
      Returns a Set of FromTableDef objects that represent all the tables that are in this from clause.

    • prepareExpressions

      public void prepareExpressions(ExpressionPreparer preparer) throws DatabaseException
      Description copied from interface: StatementTreeObject
      Prepares all expressions in this statement tree object by passing the ExpressionPreparer object to the 'prepare' method of the expression.
      Specified by:
      prepareExpressions in interface StatementTreeObject
      Throws:
      DatabaseException

    • clone

      public Object clone() throws CloneNotSupportedException
      Description copied from interface: StatementTreeObject
      Performs a DEEP clone of this object if it is mutable, or a deep clone of its mutable members. If the object is immutable then it may return 'this'.
      Specified by:
      clone in interface StatementTreeObject
      Overrides:
      clone in class Object
      Throws:
      CloneNotSupportedException