org.apache.openjpa.jdbc.kernel.exps
Class Type

java.lang.Object
  org.apache.openjpa.jdbc.kernel.exps.AbstractVal
      org.apache.openjpa.jdbc.kernel.exps.UnaryOp
          org.apache.openjpa.jdbc.kernel.exps.Type

All Implemented Interfaces:

Serializable, Val, Value

 class Type
extends UnaryOp

Entity Type expression.

Since:

2.0.0

Author:

Catalina Wei

Field Summary

(package private) Discriminator

_disc

Fields inherited from class org.apache.openjpa.jdbc.kernel.exps.AbstractVal

FALSE, TRUE

Fields inherited from interface org.apache.openjpa.jdbc.kernel.exps.Val

ABS_VAL, ARGS_VAL, CMP_EQUAL, COALESCE_VAL, CONCAT_VAL, FORCE_OUTER, GENERALCASE_VAL, INDEXOF_VAL, JOIN_REL, LENGTH_VAL, LOCATE_VAL, LOWER_VAL, MATH_VAL, NULL_CMP, NULLIF_VAL, SIMPLECASE_VAL, SQRT_VAL, SUBSTRING_VAL, TRIM_VAL, UPPER_VAL, VAL, WHENCONDITION_VAL, WHENSCALAR_VAL

Constructor Summary

Type(Val val)

Method Summary

void	appendTo(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql, int index) Append the indexth SQL element to the given buffer.
void	calculateValue(Select sel, ExpContext ctx, ExpState state, Val other, ExpState otherState) Calculate and cache the SQL for this value.
protected String	getOperator() Return the name of this operator.
protected Class	getType(Class c) Return the type of this value based on the argument type.
ExpState	initialize(Select sel, ExpContext ctx, int flags) Initialize the value.
Object	load(ExpContext ctx, ExpState state, Result res) Load the data for this value.
void	select(Select sel, ExpContext ctx, ExpState state, boolean pks) Select the data for this value.

Methods inherited from class org.apache.openjpa.jdbc.kernel.exps.UnaryOp

acceptVisit, getMetaData, getNoParen, getType, getValue, groupBy, initializeValue, length, orderBy, selectColumns, setImplicitType, setMetaData

Methods inherited from class org.apache.openjpa.jdbc.kernel.exps.AbstractVal

appendIndex, appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendSize, appendType, getAlias, getId, getName, getPath, getSelectAs, isAggregate, isVariable, isXPath, setAlias, toDataStoreValue

Methods inherited from class java.lang.Object

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

Field Detail

_disc

Discriminator _disc

Constructor Detail

Type

public Type(Val val)

Method Detail

initialize

public ExpState initialize(Select sel,
                           ExpContext ctx,
                           int flags)

Description copied from interface: Val

Initialize the value. This method should recursively initialize any sub-values.

Specified by:

initialize in interface Val

Overrides:

initialize in class UnaryOp

load

public Object load(ExpContext ctx,
                   ExpState state,
                   Result res)
            throws SQLException

Description copied from interface: Val

Load the data for this value.

Specified by:

load in interface Val

Overrides:

load in class UnaryOp

Throws:

SQLException

calculateValue

public void calculateValue(Select sel,
                           ExpContext ctx,
                           ExpState state,
                           Val other,
                           ExpState otherState)

Description copied from interface: Val

Calculate and cache the SQL for this value. This method is called before length or any append methods.

Specified by:

calculateValue in interface Val

Overrides:

calculateValue in class UnaryOp

other - the value being compared to, or null if not a comparison

select

public void select(Select sel,
                   ExpContext ctx,
                   ExpState state,
                   boolean pks)

Description copied from interface: Val

Select the data for this value.

Specified by:

select in interface Val

Overrides:

select in class UnaryOp

appendTo

public void appendTo(Select sel,
                     ExpContext ctx,
                     ExpState state,
                     SQLBuffer sql,
                     int index)

Description copied from interface: Val

Append the indexth SQL element to the given buffer.

Specified by:

appendTo in interface Val

Overrides:

appendTo in class UnaryOp

getType

protected Class getType(Class c)

Description copied from class: UnaryOp

Return the type of this value based on the argument type. Returns the argument type by default.

Overrides:

getType in class UnaryOp

getOperator

protected String getOperator()

Description copied from class: UnaryOp

Return the name of this operator.

Specified by:

getOperator in class UnaryOp