OtpErlangList (Java-Erlang Interface Library)
Keywords: com.ericsson.otp.erlang.OtpErlangList class

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## 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>, java.io.Serializable, java.lang.Cloneable

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)`

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