org.apache.pig.data

Class AbstractTuple

java.lang.Object

org.apache.pig.data.AbstractTuple

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable, java.lang.Iterable<java.lang.Object>, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable, Tuple

Direct Known Subclasses:

DefaultTuple, ExampleTuple, SchemaTuple, TargetedTuple

public abstract class AbstractTuple
extends java.lang.Object
implements Tuple

This class provides a convenient base for Tuple implementations. This makes it easier to provide default implementations as the Tuple interface is evolved.

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.apache.pig.data.Tuple

NOTNULL, NULL

Constructor Summary

Constructors

Constructor and Description
AbstractTuple()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(java.lang.Object other)
byte	getType(int fieldNum) Find the type of a given field.
boolean	isNull(int fieldNum) Find out if a given field is null.
java.util.Iterator<java.lang.Object>	iterator()
void	reference(Tuple t) Make this tuple reference the contents of another.
java.lang.String	toDelimitedString(java.lang.String delim) Write a tuple of values into a string.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.pig.data.Tuple

append, get, getAll, getMemorySize, set, size

Methods inherited from interface org.apache.hadoop.io.Writable

readFields, write

Methods inherited from interface java.lang.Comparable

compareTo

Constructor Detail

AbstractTuple

public AbstractTuple()

Method Detail

iterator

public java.util.Iterator<java.lang.Object> iterator()

Specified by:

iterator in interface java.lang.Iterable<java.lang.Object>

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toDelimitedString

public java.lang.String toDelimitedString(java.lang.String delim)
                                   throws ExecException

Write a tuple of values into a string. The output will be the result of calling toString on each of the values in the tuple.

Specified by:

toDelimitedString in interface Tuple

Parameters:

delim - Delimiter to use in the string.

Returns:

A string containing the tuple.

Throws:

ExecException - this is never thrown. This only exists for backwards compatability reasons.

getType

public byte getType(int fieldNum)
             throws ExecException

Find the type of a given field.

Specified by:

getType in interface Tuple

Parameters:

fieldNum - Number of field to get the type for.

Returns:

type, encoded as a byte value. The values are defined in DataType. If the field is null, then DataType.UNKNOWN will be returned.

Throws:

ExecException - if the field number is greater than or equal to the number of fields in the tuple.

isNull

public boolean isNull(int fieldNum)
               throws ExecException

Find out if a given field is null.

Specified by:

isNull in interface Tuple

Parameters:

fieldNum - Number of field to check for null.

Returns:

true if the field is null, false otherwise.

Throws:

ExecException - if the field number given is greater than or equal to the number of fields in the tuple.

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

reference

public void reference(Tuple t)

Description copied from interface: Tuple

Make this tuple reference the contents of another. This method does not copy the underlying data. It maintains references to the data from the original tuple (and possibly even to the data structure holding the data).

Specified by:

reference in interface Tuple

Parameters:

t - Tuple to reference.