com.ericsson.otp.erlang
Class OtpErlangTuple

java.lang.Object
  |
  +--com.ericsson.otp.erlang.OtpErlangObject
        |
        +--com.ericsson.otp.erlang.OtpErlangTuple

public class OtpErlangTuple

extends OtpErlangObject

implements java.io.Serializable, java.lang.Cloneable

Provides a Java representation of Erlang tuples. Tuples are created from one or more arbitrary Erlang terms.

The arity of the tuple is the number of elements it contains. Elements are indexed from 0 to (arity-1) and can be retrieved individually by using the appropriate index.

See Also:

Serialized Form

Constructor Summary

OtpErlangTuple(OtpErlangObject elem)
Create a unary tuple containing the given element.

OtpErlangTuple(OtpErlangObject[] elems)
Create a tuple from an array of terms.

OtpErlangTuple(OtpErlangObject[] elems, int start, int count)
Create a tuple from an array of terms.

OtpErlangTuple(OtpInputStream buf)
Create a tuple from a stream containing an tuple encoded in Erlang external format.

Method Summary

int	arity() Get the arity of the tuple.
java.lang.Object	clone()
OtpErlangObject	elementAt(int i) Get the specified element from the tuple.
OtpErlangObject[]	elements() Get all the elements from the tuple as an array.
void	encode(OtpOutputStream buf) Convert this tuple to the equivalent Erlang external representation.
boolean	equals(java.lang.Object o) Determine if two tuples are equal.
java.lang.String	toString() Get the string representation of the tuple.

Methods inherited from class com.ericsson.otp.erlang.OtpErlangObject

decode

Methods inherited from class java.lang.Object

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

Constructor Detail

OtpErlangTuple

public OtpErlangTuple(OtpErlangObject elem)

Create a unary tuple containing the given element.

Parameters:

elem - the element to create the tuple from.

Throws:

java.lang.IllegalArgumentException - if the array is empty (null).

OtpErlangTuple

public OtpErlangTuple(OtpErlangObject[] elems)

Create a tuple from an array of terms.

Parameters:

elems - the array of terms to create the tuple from.

Throws:

java.lang.IllegalArgumentException - if the array is empty (null) or contains null elements.

OtpErlangTuple

public OtpErlangTuple(OtpErlangObject[] elems,
                      int start,
                      int count)

Create a tuple from an array of terms.

Parameters:

elems - the array of terms to create the tuple from.

start - the offset of the first term to insert.

count - the number of terms to insert.

Throws:

java.lang.IllegalArgumentException - if the array is empty (null) or contains null elements.

OtpErlangTuple

public OtpErlangTuple(OtpInputStream buf)
               throws OtpErlangDecodeException

Create a tuple from a stream containing an tuple encoded in Erlang external format.

Parameters:

buf - the stream containing the encoded tuple.

Throws:

OtpErlangDecodeException - if the buffer does not contain a valid external representation of an Erlang tuple.

Method Detail

arity

public int arity()

Get the arity of the tuple.

Returns:

the number of elements contained in the tuple.

elementAt

public OtpErlangObject elementAt(int i)

Get the specified element from the tuple.

Parameters:

i - the index of the requested element. Tuple elements are numbered as array elements, starting at 0.

Returns:

the requested element, of null if i is not a valid element index.

elements

public OtpErlangObject[] elements()

Get all the elements from the tuple as an array.

Returns:

an array containing all of the tuple's elements.

toString

public java.lang.String toString()

Get the string representation of the tuple.

Overrides:

toString in class OtpErlangObject

Returns:

the string representation of the tuple.

encode

public void encode(OtpOutputStream buf)

Convert this tuple to the equivalent Erlang external representation.

Overrides:

encode in class OtpErlangObject

Parameters:

buf - an output stream to which the encoded tuple should be written.

equals

public boolean equals(java.lang.Object o)

Determine if two tuples are equal. Tuples are equal if they have the same arity and all of the elements are equal.

Overrides:

equals in class OtpErlangObject

Parameters:

o - the tuple to compare to.

Returns:

true if the tuples have the same arity and all the elements are equal.

clone

public java.lang.Object clone()

Overrides:

clone in class OtpErlangObject