Package ptolemy.data

Class LongToken

  • All Implemented Interfaces:
    BitwiseOperationToken, PartiallyOrderedToken
    public class LongToken
extends ScalarToken
    A token that contains a signed 64-bit long integer. Generally, this class handles overflow the same way that overflow for Java native types are handled. In other words, overflow just past java.lang.Long.MAX_VALUE results in negative values close to java.lang.Long.MIN_VALUE.
    Since:
    Ptolemy II 0.2
    Version:
    $Id$
    Author:
    Neil Smyth, Yuhong Xiong, Steve Neuendorffer, contributor: Christopher Brooks
    Pt.AcceptedRating:
    Red (cxh)
    Pt.ProposedRating:
    Yellow (cxh) nil token, ONE, ZERO

    • Field Detail

      • NIL

        public static final LongToken NIL
        A token that represents a missing value. Null or missing tokens are common in analytical systems like R and SAS where they are used to handle sparsely populated data sources. In database parlance, missing tokens are sometimes called null tokens. Since null is a Java keyword, we use the term "nil". The toString() method on a nil token returns the string "nil".

      • ONE

        public static final LongToken ONE
        A LongToken with the value 1.0.

      • ZERO

        public static final LongToken ZERO
        A LongToken with the value 0.0.

    • Constructor Detail

      • LongToken

        public LongToken()
        Construct a token with long integer 0.

      • LongToken

        public LongToken​(long value)
        Construct a token with the specified value.
        Parameters:
        value - The specified value.

      • LongToken

        public LongToken​(java.lang.String init)
          throws IllegalActionException
        Construct a token from the given String.
        Parameters:
        init - The specified string, for example 1L 2L. Note that 3 will also result a LongToken with a value of 3 being created.
        Throws:
        IllegalActionException - If the Token could not be created with the given String.

    • Method Detail

      • convert

        public static LongToken convert​(Token token)
                         throws IllegalActionException
        Convert the specified token into an instance of LongToken. This method does lossless conversion. The units of the returned token will be the same as the units of the given token. If the argument is already an instance of LongToken, it is returned without any change. If the argument is a nil token, then a new nil Token is returned, see NIL. Otherwise, if the argument is below LongToken in the type hierarchy, it is converted to an instance of LongToken or one of the subclasses of LongToken and returned. If none of the above condition is met, an exception is thrown.
        Parameters:
        token - The token to be converted to a LongToken.
        Returns:
        A LongToken.
        Throws:
        IllegalActionException - If the conversion cannot be carried out.

      • equals

        public boolean equals​(java.lang.Object object)
        Return true if the argument's class is LongToken and it has the same values as this token.
        Overrides:
        equals in class java.lang.Object
        Parameters:
        object - An instance of Object.
        Returns:
        True if the argument is an IntToken with the same value. If either this object or the argument is a nil Token, return false.

      • getType

        public Type getType()
        Return the type of this token.
        Specified by:
        getType in class ScalarToken
        Returns:
        BaseType.LONG_MATRIX

      • hashCode

        public int hashCode()
        Return a hash code value for this token. This method returns the value of this token, casted to integer.
        Overrides:
        hashCode in class java.lang.Object
        Returns:
        A hash code value for this token.

      • isNil

        public boolean isNil()
        Return true if the token is nil, (aka null or missing). Nil or missing tokens occur when a data source is sparsely populated.
        Overrides:
        isNil in class Token
        Returns:
        True if the token is the NIL token.

      • leftShift

        public ScalarToken leftShift​(int bits)
        Returns a token representing the result of shifting the bits of this token towards the most significant bit, filling the least significant bits with zeros.
        Overrides:
        leftShift in class ScalarToken
        Parameters:
        bits - The number of bits to shift.
        Returns:
        The left shift. If this token is nil, then NIL is returned.

      • logicalRightShift

        public ScalarToken logicalRightShift​(int bits)
        Returns a token representing the result of shifting the bits of this token towards the least significant bit, filling the most significant bits with zeros. This treats the value as an unsigned number, which may have the effect of destroying the sign of the value.
        Overrides:
        logicalRightShift in class ScalarToken
        Parameters:
        bits - The number of bits to shift.
        Returns:
        The logical right shift. If this token is nil, then NIL is returned.

      • longValue

        public long longValue()
        Return the value in the token as a long.
        Overrides:
        longValue in class ScalarToken
        Returns:
        The value of this token as a long.

      • one

        public Token one()
        Returns a LongToken with value 1.
        Overrides:
        one in class Token
        Returns:
        A LongToken with value 1.

      • rightShift

        public ScalarToken rightShift​(int bits)
        Returns a token representing the result of shifting the bits of this token towards the least significant bit, filling the most significant bits with the sign of the value. This preserves the sign of the result.
        Overrides:
        rightShift in class ScalarToken
        Parameters:
        bits - The number of bits to shift.
        Returns:
        The right shift. If this token is nil, then NIL is returned.

      • toString

        public java.lang.String toString()
        Return the value of this token as a string that can be parsed by the expression language to recover a token with the same value.
        Overrides:
        toString in class Token
        Returns:
        A String formed using java.lang.Long.toString().

      • zero

        public Token zero()
        Returns a LongToken with value 0.
        Overrides:
        zero in class Token
        Returns:
        A LongToken with value 0.

      • _absolute

        protected ScalarToken _absolute()
        Return a ScalarToken containing the absolute value of the value of this token. If this token contains a non-negative number, it is returned directly; otherwise, a new token is is return. Note that it is explicitly allowable to return this token, since the units are the same.
        Specified by:
        _absolute in class ScalarToken
        Returns:
        An LongToken.

      • _add

        protected ScalarToken _add​(ScalarToken rightArgument)
        Return a new token whose value is the value of the argument Token added to the value of this Token. It is assumed that the type of the argument is an LongToken.
        Specified by:
        _add in class ScalarToken
        Parameters:
        rightArgument - The token to add to this token.
        Returns:
        A new LongToken containing the result.

      • _bitwiseAnd

        protected ScalarToken _bitwiseAnd​(ScalarToken rightArgument)
        Returns a token representing the bitwise AND of this token and the given token. It is assumed that the type of the argument is an LongToken.
        Specified by:
        _bitwiseAnd in class ScalarToken
        Parameters:
        rightArgument - The LongToken to bitwise AND with this one.
        Returns:
        The bitwise AND.

      • _bitwiseNot

        protected ScalarToken _bitwiseNot()
        Returns a token representing the bitwise NOT of this token. It is assumed that the type of the argument is an LongToken.
        Specified by:
        _bitwiseNot in class ScalarToken
        Returns:
        The bitwise NOT of this token.

      • _bitwiseOr

        protected ScalarToken _bitwiseOr​(ScalarToken rightArgument)
        Returns a token representing the bitwise OR of this token and the given token. It is assumed that the type of the argument is an LongToken.
        Specified by:
        _bitwiseOr in class ScalarToken
        Parameters:
        rightArgument - The LongToken to bitwise OR with this one.
        Returns:
        The bitwise OR.

      • _bitwiseXor

        protected ScalarToken _bitwiseXor​(ScalarToken rightArgument)
        Returns a token representing the bitwise XOR of this token and the given token. It is assumed that the type of the argument is an LongToken.
        Specified by:
        _bitwiseXor in class ScalarToken
        Parameters:
        rightArgument - The LongToken to bitwise XOR with this one.
        Returns:
        The bitwise XOR.

      • _divide

        protected ScalarToken _divide​(ScalarToken rightArgument)
        Return a new token whose value is the value of this token divided by the value of the argument token. It is assumed that the type of the argument is an LongToken
        Specified by:
        _divide in class ScalarToken
        Parameters:
        rightArgument - The token to divide this token by.
        Returns:
        A new LongToken containing the result.

      • _isCloseTo

        protected BooleanToken _isCloseTo​(ScalarToken rightArgument,
                                  double epsilon)
        Test whether the value of this token is close to the first argument, where "close" means that the distance between their values is less than or equal to the second argument. It is assumed that the type of the first argument is LongToken.
        Specified by:
        _isCloseTo in class ScalarToken
        Parameters:
        rightArgument - The token to compare to this token.
        epsilon - The distance.
        Returns:
        A token containing true if the value of the first argument is close to the value of this token.

      • _isLessThan

        protected BooleanToken _isLessThan​(ScalarToken rightArgument)
                            throws IllegalActionException
        Test for ordering of the values of this Token and the argument Token. It is assumed that the type of the argument is LongToken.
        Specified by:
        _isLessThan in class ScalarToken
        Parameters:
        rightArgument - The token to add to this token.
        Returns:
        A new Token containing the result.
        Throws:
        IllegalActionException - If this method is not supported by the derived class.

      • _modulo

        protected ScalarToken _modulo​(ScalarToken rightArgument)
        Return a new token whose value is the value of this token modulo the value of the argument token. It is assumed that the type of the argument is an LongToken.
        Specified by:
        _modulo in class ScalarToken
        Parameters:
        rightArgument - The token to modulo this token by.
        Returns:
        A new LongToken containing the result.

      • _multiply

        protected ScalarToken _multiply​(ScalarToken rightArgument)
        Return a new token whose value is the value of this token multiplied by the value of the argument token. It is assumed that the type of the argument is an LongToken.
        Specified by:
        _multiply in class ScalarToken
        Parameters:
        rightArgument - The token to multiply this token by.
        Returns:
        A new LongToken containing the result.

      • _subtract

        protected ScalarToken _subtract​(ScalarToken rightArgument)
        Return a new token whose value is the value of the argument token subtracted from the value of this token. It is assumed that the type of the argument is an LongToken.
        Specified by:
        _subtract in class ScalarToken
        Parameters:
        rightArgument - The token to subtract from this token.
        Returns:
        A new LongToken containing the result.