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

java.lang.Object
  org.apache.openjpa.jdbc.kernel.exps.AbstractVal
      org.apache.openjpa.jdbc.kernel.exps.StringFunction
          org.apache.openjpa.jdbc.kernel.exps.StringLength

All Implemented Interfaces:

Serializable, Val, Value

public class StringLength
extends StringFunction

Returns the number of characters in a string.

Author:

Marc Prud'hommeaux

See Also:

Serialized Form

Field Summary

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

StringLength(Val val)
Constructor.

Method Summary

void	appendTo(Select sel, ExpContext ctx, ExpState state, SQLBuffer buf, int index) Append the indexth SQL element to the given buffer.
int	getId()
Class	getType() Return the expected type for this value, or Object if the type is unknown.
void	setImplicitType(Class type) Set the implicit type of the value, based on how it is used in the filter.

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

acceptVisit, calculateValue, getMetaData, getValue, groupBy, initialize, length, load, orderBy, select, selectColumns, setMetaData

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

appendIndex, appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendSize, appendType, getAlias, 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

Constructor Detail

StringLength

public StringLength(Val val)

Constructor. Provide the string to operate on.

Method Detail

getType

public Class getType()

Description copied from interface: Value

Return the expected type for this value, or Object if the type is unknown.

Specified by:

getType in interface Value

Overrides:

getType in class StringFunction

setImplicitType

public void setImplicitType(Class type)

Description copied from interface: Value

Set the implicit type of the value, based on how it is used in the filter. This method is only called on values who return Object from Value.getType().

Specified by:

setImplicitType in interface Value

Overrides:

setImplicitType in class StringFunction

appendTo

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

Description copied from interface: Val

Append the indexth SQL element to the given buffer.

getId

public int getId()

Specified by:

getId in interface Val

Overrides:

getId in class AbstractVal