com.ericsson.otp.erlang
Class OtpErlangList

java.lang.Object
  com.ericsson.otp.erlang.OtpErlangObject
      com.ericsson.otp.erlang.OtpErlangList

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Iterable<OtpErlangObject>

Direct Known Subclasses:

OtpErlangList.SubList

public class OtpErlangList
extends OtpErlangObject
implements java.lang.Iterable<OtpErlangObject>

Provides a Java representation of Erlang lists. Lists are created from zero or more arbitrary Erlang terms.

The arity of the list is the number of elements it contains.

See Also:

Serialized Form

Nested Class Summary

static class

OtpErlangList.SubList

Nested classes/interfaces inherited from class com.ericsson.otp.erlang.OtpErlangObject

OtpErlangObject.Hash

Field Summary

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

hashCodeValue

Constructor Summary

OtpErlangList()
Create an empty list.

OtpErlangList(OtpErlangObject elem)
Create a list containing one element.

OtpErlangList(OtpErlangObject[] elems)
Create a list from an array of arbitrary Erlang terms.

OtpErlangList(OtpErlangObject[] elems, int start, int count)
Create a list from an array of arbitrary Erlang terms.

OtpErlangList(OtpErlangObject[] elems, OtpErlangObject lastTail)
Create a list from an array of arbitrary Erlang terms.

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

OtpErlangList(java.lang.String str)
Create a list of Erlang integers representing Unicode codePoints.

Method Summary

int	arity() Get the arity of the list.
java.lang.Object	clone()
protected int	doHashCode()
OtpErlangObject	elementAt(int i) Get the specified element from the list.
OtpErlangObject[]	elements() Get all the elements from the list as an array.
void	encode(OtpOutputStream buf) Convert this list to the equivalent Erlang external representation.
protected void	encode(OtpOutputStream buf, int start)
boolean	equals(java.lang.Object o) Determine if two lists are equal.
OtpErlangObject	getHead()
OtpErlangObject	getLastTail()
OtpErlangObject	getNthTail(int n)
OtpErlangObject	getTail()
boolean	isProper()
java.util.Iterator<OtpErlangObject>	iterator()
java.lang.String	stringValue() Convert a list of integers into a Unicode string, interpreting each integer as a Unicode code point value.
java.lang.String	toString() Get the string representation of the list.
protected java.lang.String	toString(int start)

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

decode, hashCode

Methods inherited from class java.lang.Object

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

Constructor Detail

OtpErlangList

public OtpErlangList()

Create an empty list.

OtpErlangList

public OtpErlangList(java.lang.String str)

Create a list of Erlang integers representing Unicode codePoints. This method does not check if the string contains valid code points.

Parameters:

str - the characters from which to create the list.

OtpErlangList

public OtpErlangList(OtpErlangObject elem)

Create a list containing one element.

Parameters:

elem - the elememet to make the list from.

OtpErlangList

public OtpErlangList(OtpErlangObject[] elems)

Create a list from an array of arbitrary Erlang terms.

Parameters:

elems - the array of terms from which to create the list.

OtpErlangList

public OtpErlangList(OtpErlangObject[] elems,
                     OtpErlangObject lastTail)
              throws OtpErlangException

Create a list from an array of arbitrary Erlang terms. Tail can be specified, if not null, the list will not be proper.

Parameters:

elems - array of terms from which to create the list

lastTail -

Throws:

OtpErlangException

OtpErlangList

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

Create a list from an array of arbitrary Erlang terms.

Parameters:

elems - the array of terms from which to create the list.

start - the offset of the first term to insert.

count - the number of terms to insert.

OtpErlangList

public OtpErlangList(OtpInputStream buf)
              throws OtpErlangDecodeException

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

Parameters:

buf - the stream containing the encoded list.

Throws:

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

Method Detail

arity

public int arity()

Get the arity of the list.

Returns:

the number of elements contained in the list.

elementAt

public OtpErlangObject elementAt(int i)

Get the specified element from the list.

Parameters:

i - the index of the requested element. List 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 list as an array.

Returns:

an array containing all of the list's elements.

toString

public java.lang.String toString()

Get the string representation of the list.

Specified by:

toString in class OtpErlangObject

Returns:

the string representation of the list.

toString

protected java.lang.String toString(int start)

encode

public void encode(OtpOutputStream buf)

Convert this list to the equivalent Erlang external representation. Note that this method never encodes lists as strings, even when it is possible to do so.

Specified by:

encode in class OtpErlangObject

Parameters:

buf - An output stream to which the encoded list should be written.

encode

protected void encode(OtpOutputStream buf,
                      int start)

equals

public boolean equals(java.lang.Object o)

Determine if two lists are equal. Lists are equal if they have the same arity and all of the elements are equal.

Specified by:

equals in class OtpErlangObject

Parameters:

o - the list to compare to.

Returns:

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

getLastTail

public OtpErlangObject getLastTail()

doHashCode

protected int doHashCode()

Overrides:

doHashCode in class OtpErlangObject

clone

public java.lang.Object clone()

Overrides:

clone in class OtpErlangObject

iterator

public java.util.Iterator<OtpErlangObject> iterator()

Specified by:

iterator in interface java.lang.Iterable<OtpErlangObject>

isProper

public boolean isProper()

Returns:

true if the list is proper, i.e. the last tail is nil

getHead

public OtpErlangObject getHead()

getTail

public OtpErlangObject getTail()

getNthTail

public OtpErlangObject getNthTail(int n)

stringValue

public java.lang.String stringValue()
                             throws OtpErlangException

Convert a list of integers into a Unicode string, interpreting each integer as a Unicode code point value.

Returns:

A java.lang.String object created through its constructor String(int[], int, int).

Throws:

OtpErlangException - for non-proper and non-integer lists.

OtpErlangRangeException - if any integer does not fit into a Java int.

java.security.InvalidParameterException - if any integer is not within the Unicode range.

See Also:

String.String(int[], int, int)