com.caucho.amber.expr
Class ColumnExpr

java.lang.Object
  com.caucho.amber.expr.AbstractAmberExpr
      com.caucho.amber.expr.ColumnExpr

All Implemented Interfaces:

AmberExpr

Direct Known Subclasses:

KeyColumnExpr

public class ColumnExpr
extends AbstractAmberExpr

Bound identifier expression.

Field Summary

protected FromItem	_fromItem
protected PathExpr	_parent

Fields inherited from interface com.caucho.amber.expr.AmberExpr

IS_INNER_JOIN, USES_DATA

Constructor Summary

ColumnExpr(PathExpr parent, AmberColumn column)
Creates a new unbound id expression.

Method Summary

AmberExpr	bindSelect(QueryParser parser) Binds the expression as a select item.
AmberExpr	createBoolean() Returns a boolean expression.
void	generateHaving(CharBuffer cb) Generates the having expression.
void	generateUpdateWhere(CharBuffer cb) Generates the (update) where expression.
void	generateWhere(CharBuffer cb) Generates the where expression.
AmberColumn	getColumn() Returns the name.
PathExpr	getParent() Returns the parent.
AmberType	getType() Returns the expr type.
boolean	hasRelationship() Returns true if this expr has any relationship.
AmberExpr	replaceJoin(JoinExpr join) Replaces linked join to eliminate a table.
java.lang.String	toString()
boolean	usesFrom(FromItem from, int type, boolean isNot) Returns true if the expression uses the from item.

Methods inherited from class com.caucho.amber.expr.AbstractAmberExpr

exists, exists, findItem, generateJoin, generateSelect, getCacheObject, getColumnCount, getObject, isBoolean, setInternalArgType, usesFrom

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

_parent

protected PathExpr _parent

_fromItem

protected FromItem _fromItem

Constructor Detail

ColumnExpr

public ColumnExpr(PathExpr parent,
                  AmberColumn column)

Creates a new unbound id expression.

Method Detail

getParent

public PathExpr getParent()

Returns the parent.

getColumn

public AmberColumn getColumn()

Returns the name.

getType

public AmberType getType()

Returns the expr type.

Specified by:

getType in interface AmberExpr

Overrides:

getType in class AbstractAmberExpr

hasRelationship

public boolean hasRelationship()

Returns true if this expr has any relationship.

Specified by:

hasRelationship in interface AmberExpr

Overrides:

hasRelationship in class AbstractAmberExpr

createBoolean

public AmberExpr createBoolean()
                        throws QueryParseException

Returns a boolean expression.

Specified by:

createBoolean in interface AmberExpr

Overrides:

createBoolean in class AbstractAmberExpr

Throws:

QueryParseException

bindSelect

public AmberExpr bindSelect(QueryParser parser)

Binds the expression as a select item.

Specified by:

bindSelect in interface AmberExpr

Specified by:

bindSelect in class AbstractAmberExpr

usesFrom

public boolean usesFrom(FromItem from,
                        int type,
                        boolean isNot)

Returns true if the expression uses the from item.

Specified by:

usesFrom in interface AmberExpr

Overrides:

usesFrom in class AbstractAmberExpr

replaceJoin

public AmberExpr replaceJoin(JoinExpr join)

Replaces linked join to eliminate a table.

Specified by:

replaceJoin in interface AmberExpr

Overrides:

replaceJoin in class AbstractAmberExpr

generateWhere

public void generateWhere(CharBuffer cb)

Generates the where expression.

Specified by:

generateWhere in interface AmberExpr

Overrides:

generateWhere in class AbstractAmberExpr

generateUpdateWhere

public void generateUpdateWhere(CharBuffer cb)

Generates the (update) where expression.

Specified by:

generateUpdateWhere in interface AmberExpr

Overrides:

generateUpdateWhere in class AbstractAmberExpr

generateHaving

public void generateHaving(CharBuffer cb)

Generates the having expression.

Specified by:

generateHaving in interface AmberExpr

Overrides:

generateHaving in class AbstractAmberExpr

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object