oracle.javatools.db.sql
Class FromObject

java.lang.Object
  oracle.javatools.db.AbstractDBObject
      oracle.javatools.db.sql.AbstractSQLFragment
          oracle.javatools.db.sql.AbstractAliasFragment
              oracle.javatools.db.sql.FromObject

All Implemented Interfaces:

AliasFragment, Copyable, DBObject, DynamicPropertySet, SQLFragment

public class FromObject

extends AbstractAliasFragment

Object that represents a clause in the FROM statement of a SQL query.

Since:

10.1.3

Field Summary

static java.lang.String

TYPE

Fields inherited from class oracle.javatools.db.sql.AbstractSQLFragment

EMPTY, EMPTY_ARRAY, NEWLINE, SPACE

Fields inherited from interface oracle.javatools.db.sql.SQLFragment

FROM, GROUPBY, HAVING, ORDERBY, SELECT, WHERE

Fields inherited from interface oracle.javatools.db.DBObject

COMMENT

Constructor Summary

FromObject()
Create an empty FROM object.

FromObject(SQLFragment expression, java.lang.String alias)
Create a FROM object with the given expression and alias.

Method Summary

boolean	canHaveAlias() In certain circumstances an AliasFragment cannot have an alias.
java.lang.Object	copyTo(java.lang.Object target) Copies the state of this DBObject to another instance.
boolean	equals(java.lang.Object obj)
java.lang.String	getType() Returns the type of this object.
void	setExpression(SQLFragment exp) Sets the expression part of the fragment.

Methods inherited from class oracle.javatools.db.sql.AbstractAliasFragment

canUseAsAlias, copyToImpl, equalsImpl, getAlias, getExpression, getName, getOwnedObjectsImpl, getSQLText, getUsableAlias, setAlias, setName, toString, useAsBeforeAlias

Methods inherited from class oracle.javatools.db.sql.AbstractSQLFragment

appendToBuffer, changeParent, copyList, copyList, getChildren, getParent, getTextOrNull, hashCode, removeParent, setParent, setParents

Methods inherited from class oracle.javatools.db.AbstractDBObject

compareToImpl, copyToImpl, equalsImpl, findOwnedObject, getID, getOwnedObjects, getOwnedObjects, getProperties, getProperty, getProperty, getReferenceIDs, getReferenceIDsImpl, replaceReferenceIDs, setID, setProperties, setProperty

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface oracle.javatools.db.sql.SQLFragment

getChildren, getParent, setParent

Methods inherited from interface oracle.javatools.db.DBObject

findOwnedObject, getID, getOwnedObjects, getOwnedObjects, getReferenceIDs, replaceReferenceIDs, setID

Methods inherited from interface oracle.javatools.util.DynamicPropertySet

getProperties, getProperty, getProperty, setProperties, setProperty

Field Detail

TYPE

public static final java.lang.String TYPE

See Also:

Constant Field Values

Constructor Detail

FromObject

public FromObject()

Create an empty FROM object.

FromObject

public FromObject(SQLFragment expression,
                  java.lang.String alias)

Create a FROM object with the given expression and alias.

Method Detail

getType

public java.lang.String getType()

Description copied from interface: DBObject

Returns the type of this object. Valid types include things like tables, views, synonyms, and columns.

Specified by:

getType in interface DBObject

Overrides:

getType in class AbstractSQLFragment

copyTo

public java.lang.Object copyTo(java.lang.Object target)

Description copied from interface: DBObject

Copies the state of this DBObject to another instance. If null is specified for the target, a new instance will be created.

The entire state of the object will be copied, with a few exceptions. In particular, any observers registered will NOT be copied. In cases where this instance contains child DBObjects, new instances of those children will be created, and the state copied to them. The copy will thus contain its own unique state; after making the copy, changing one instance will not cause any changes to occur to the copy. The properties will be copied; however, copies will not be made of the values referenced by the properties - thus, the copy will refer to the same instance as the original. Child objects that are copied will still point to the original parent; it is the responsibility of a copied parent to update the parent of copies of its children point to the copy of itself.

The ID associated with this object will not be copied. If the copy is intended to be a temporary copy of this object (to be used in a dialog editing the object for example), then the caller should explicitly set the ID of the copy to be the same as on this object. However, if the new object is intended to exist separately from this object, the caller should ensure that the new object have a different ID from this object.

Parameters:

target - The object to copy to. If target is null, a new instance will be created, and the state will be copied to that object.

Returns:

the copy.

equals

public boolean equals(java.lang.Object obj)

setExpression

public void setExpression(SQLFragment exp)

Description copied from class: AbstractAliasFragment

Sets the expression part of the fragment.

Specified by:

setExpression in interface AliasFragment

Overrides:

setExpression in class AbstractAliasFragment

canHaveAlias

public boolean canHaveAlias()

Description copied from class: AbstractAliasFragment

In certain circumstances an AliasFragment cannot have an alias. This method returns false if that is the case.

Overrides:

canHaveAlias in class AbstractAliasFragment