java.lang.Object
- org.apache.sysds.parser.Expression

All Implemented Interfaces:

ParseInfo

Direct Known Subclasses:

BinaryExpression, BooleanExpression, ExpressionList, Identifier, IterablePredicate, RelationalExpression
```
public abstract class Expression
extends Object
implements ParseInfo
```

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`Expression.BinaryOp`	Binary operators.
`static class`	`Expression.BooleanOp`	Boolean operators.
`static class`	`Expression.DataOp`	Data operators.
`static class`	`Expression.FunctCallOp`	Function call operators.
`static class`	`Expression.RelationalOp`	Relational operators.

Constructor Summary

Constructors
Constructor Description

Expression()

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`static Types.DataType`	`computeDataType(Expression expression1, Expression expression2, boolean cast)`	Compute data type based on expressions.
`static Types.DataType`	`computeDataType(Identifier identifier1, Identifier identifier2, boolean cast)`	Compute data type based on identifiers.
`static Types.ValueType`	`computeValueType(Expression expr1, Types.ValueType v1, Types.ValueType v2, boolean cast)`
`static Types.ValueType`	`computeValueType(Expression expression1, Expression expression2, boolean cast)`	Compute value type based on expressions.
`static Types.ValueType`	`computeValueType(Identifier identifier1, Identifier identifier2, boolean cast)`	Compute value type based on identifiers.
`static Types.FileFormat`	`convertFormatType(String format)`	Convert string format type to `Hop.FileFormatTypes`.
`boolean`	`equals(Object that)`
`int`	`getBeginColumn()`
`int`	`getBeginLine()`
`static MatrixCharacteristics`	`getBinaryMatrixCharacteristics(Expression expression1, Expression expression2)`	Returns the matrix characteristics for scalar-scalar, scalar-matrix, matrix-scalar, matrix-matrix operations.
`static Expression.BinaryOp`	`getBinaryOp(String val)`	Convert string value to binary operator.
`static Expression.BooleanOp`	`getBooleanOp(String val)`	Convert string value to boolean operator.
`int`	`getEndColumn()`
`int`	`getEndLine()`
`String`	`getFilename()`
`Identifier`	`getOutput()`	Obtain identifier.
`Identifier[]`	`getOutputs()`	Obtain identifiers.
`ArrayList<String>`	`getParseExceptionList()`
`static Expression.RelationalOp`	`getRelationalOp(String val)`	Convert string value to relational operator.
`static String`	`getTempName()`	Obtain temporary name ("parsertemp" + _tempId) for expression.
`String`	`getText()`
`int`	`hashCode()`
`String`	`printErrorLocation()`
`String`	`printInfoLocation()`	Return info message containing the filename, the beginning line position, and the beginning column position.
`String`	`printWarningLocation()`
`void`	`raiseValidateError(String message)`	Throw a LanguageException with the message.
`void`	`raiseValidateError(String message, boolean conditional)`	Throw a LanguageException with the message if conditional is `false`; otherwise log the message as a warning.
`void`	`raiseValidateError(String msg, boolean conditional, String errorCode)`	Throw a LanguageException with the message (and optional error code) if conditional is `false`; otherwise log the message as a warning.
`abstract Expression`	`rewriteExpression(String prefix)`
`void`	`setBeginColumn(int passed)`
`void`	`setBeginLine(int passed)`
`void`	`setCtxValues(org.antlr.v4.runtime.ParserRuleContext ctx)`	Set ParserRuleContext values (begin line, begin column, end line, end column, and text).
`void`	`setCtxValuesAndFilename(org.antlr.v4.runtime.ParserRuleContext ctx, String filename)`	Set ParserRuleContext values (begin line, begin column, end line, end column, and text) and file name.
`void`	`setEndColumn(int passed)`
`void`	`setEndLine(int passed)`
`void`	`setFilename(String passed)`
`void`	`setOutput(Identifier output)`
`void`	`setParseExceptionList(ArrayList<String> passed)`
`void`	`setParseInfo(ParseInfo parseInfo)`	Set parse information.
`void`	`setText(String text)`
`void`	`validateExpression(HashMap<String,DataIdentifier> ids, HashMap<String,ConstIdentifier> currConstVars, boolean conditional)`
`void`	`validateExpression(MultiAssignmentStatement mas, HashMap<String,DataIdentifier> ids, HashMap<String,ConstIdentifier> currConstVars, boolean conditional)`
`abstract VariableSet`	`variablesRead()`
`abstract VariableSet`	`variablesUpdated()`

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Expression
```
public Expression()
```
- Method Detail
  - rewriteExpression
```
public abstract Expression rewriteExpression(String prefix)
```
  - setOutput
```
public void setOutput(Identifier output)
```
  - getOutput
```
public Identifier getOutput()
```
    Obtain identifier.
    
    Returns:
    
    Identifier
  - getOutputs
```
public Identifier[] getOutputs()
```
    Obtain identifiers.
    
    Returns:
    
    Identifiers
  - validateExpression
```
public void validateExpression(HashMap<String,DataIdentifier> ids,
                               HashMap<String,ConstIdentifier> currConstVars,
                               boolean conditional)
```
  - validateExpression
```
public void validateExpression(MultiAssignmentStatement mas,
                               HashMap<String,DataIdentifier> ids,
                               HashMap<String,ConstIdentifier> currConstVars,
                               boolean conditional)
```
  - getBinaryOp
```
public static Expression.BinaryOp getBinaryOp(String val)
```
    Convert string value to binary operator.
    
    Parameters:
    
    val - String value ('+', '-', '*', '/', '%%', '%/%', '^', %*%')
    
    Returns:
    
    Binary operator (BinaryOp.PLUS, BinaryOp.MINUS, BinaryOp.MULT, BinaryOp.DIV, BinaryOp.MODULUS, BinaryOp.INTDIV, BinaryOp.POW, BinaryOp.MATMULT). Returns BinaryOp.INVALID if string value not recognized.
  - getRelationalOp
```
public static Expression.RelationalOp getRelationalOp(String val)
```
    Convert string value to relational operator.
    
    Parameters:
    
    val - String value ('<', '<=', '>', '>=', '==', '!=')
    
    Returns:
    
    Relational operator (RelationalOp.LESS, RelationalOp.LESSEQUAL, RelationalOp.GREATER, RelationalOp.GREATEREQUAL, RelationalOp.EQUAL, RelationalOp.NOTEQUAL). Returns RelationalOp.INVALID if string value not recognized.
  - getBooleanOp
```
public static Expression.BooleanOp getBooleanOp(String val)
```
    Convert string value to boolean operator.
    
    Parameters:
    
    val - String value ('&&', '&', '||', '|', '!')
    
    Returns:
    
    Boolean operator (BooleanOp.CONDITIONALAND, BooleanOp.LOGICALAND, BooleanOp.CONDITIONALOR, BooleanOp.LOGICALOR, BooleanOp.NOT). Returns BooleanOp.INVALID if string value not recognized.
  - convertFormatType
```
public static Types.FileFormat convertFormatType(String format)
```
    Convert string format type to Hop.FileFormatTypes.
    
    Parameters:
    
    format - String format type ("text", "binary", "mm", "csv")
    
    Returns:
    
    Format as Hop.FileFormatTypes. Can be FileFormatTypes.TEXT, FileFormatTypes.BINARY, FileFormatTypes.MM, or FileFormatTypes.CSV. Unrecognized type is set to FileFormatTypes.TEXT.
  - getTempName
```
public static String getTempName()
```
    Obtain temporary name ("parsertemp" + _tempId) for expression. Used to construct Hops from parse tree.
    
    Returns:
    
    Temporary name of expression.
  - variablesRead
```
public abstract VariableSet variablesRead()
```
  - variablesUpdated
```
public abstract VariableSet variablesUpdated()
```
  - computeDataType
```
public static Types.DataType computeDataType(Expression expression1,
                                             Expression expression2,
                                             boolean cast)
```
    Compute data type based on expressions. The identifier for each expression is obtained and passed to computeDataType(Identifier, Identifier, boolean). If the identifiers have the same data type, the shared data type is returned. Otherwise, if cast is true and one of the identifiers is a matrix and the other identifier is a scalar, return DataType.MATRIX. Otherwise, throw a LanguageException.
    
    Parameters:
    
    expression1 - First expression
    
    expression2 - Second expression
    
    cast - Whether a cast should potentially be performed
    
    Returns:
    
    The data type (Types.DataType)
  - computeDataType
```
public static Types.DataType computeDataType(Identifier identifier1,
                                             Identifier identifier2,
                                             boolean cast)
```
    Compute data type based on identifiers. If the identifiers have the same data type, the shared data type is returned. Otherwise, if cast is true and one of the identifiers is a matrix and the other identifier is a scalar, return DataType.MATRIX. Otherwise, throw a LanguageException.
    
    Parameters:
    
    identifier1 - First identifier
    
    identifier2 - Second identifier
    
    cast - Whether a cast should potentially be performed
    
    Returns:
    
    The data type (Types.DataType)
  - computeValueType
```
public static Types.ValueType computeValueType(Expression expression1,
                                               Expression expression2,
                                               boolean cast)
```
    Compute value type based on expressions. The identifier for each expression is obtained and passed to computeValueType(Identifier, Identifier, boolean). If the identifiers have the same value type, the shared value type is returned. Otherwise, if cast is true and one value type is a double and the other is an int, return ValueType.DOUBLE. If cast is true and one value type is a string or the other value type is a string, return ValueType.STRING. Otherwise, throw a LanguageException.
    
    Parameters:
    
    expression1 - First expression
    
    expression2 - Second expression
    
    cast - Whether a cast should potentially be performed
    
    Returns:
    
    The value type (Types.ValueType)
  - computeValueType
```
public static Types.ValueType computeValueType(Identifier identifier1,
                                               Identifier identifier2,
                                               boolean cast)
```
    Compute value type based on identifiers. If the identifiers have the same value type, the shared value type is returned. Otherwise, if cast is true and one value type is a double and the other is an int, return ValueType.DOUBLE. If cast is true and one value type is a string or the other value type is a string, return ValueType.STRING. Otherwise, throw a LanguageException.
    
    Parameters:
    
    identifier1 - First identifier
    
    identifier2 - Second identifier
    
    cast - Whether a cast should potentially be performed
    
    Returns:
    
    The value type (Types.ValueType)
  - computeValueType
```
public static Types.ValueType computeValueType(Expression expr1,
                                               Types.ValueType v1,
                                               Types.ValueType v2,
                                               boolean cast)
```
  - equals
```
public boolean equals(Object that)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - raiseValidateError
```
public void raiseValidateError(String message)
```
    Throw a LanguageException with the message.
    
    Parameters:
    
    message - the error message
  - raiseValidateError
```
public void raiseValidateError(String message,
                               boolean conditional)
```
    Throw a LanguageException with the message if conditional is false; otherwise log the message as a warning.
    
    Parameters:
    
    message - the error (or warning) message
    
    conditional - if true, display log warning message. Otherwise, the message will be thrown as a LanguageException
  - raiseValidateError
```
public void raiseValidateError(String msg,
                               boolean conditional,
                               String errorCode)
```
    Throw a LanguageException with the message (and optional error code) if conditional is false; otherwise log the message as a warning.
    
    Parameters:
    
    msg - the error (or warning) message
    
    conditional - if true, display log warning message. Otherwise, the message (and optional error code) will be thrown as a LanguageException
    
    errorCode - optional error code
  - getBinaryMatrixCharacteristics
```
public static MatrixCharacteristics getBinaryMatrixCharacteristics(Expression expression1,
                                                                   Expression expression2)
```
    Returns the matrix characteristics for scalar-scalar, scalar-matrix, matrix-scalar, matrix-matrix operations. This method is aware of potentially unknowns and matrix-vector (col/row) operations.
    
    Parameters:
    
    expression1 - The first expression
    
    expression2 - The second expression
    
    Returns:
    
    matrix characteristics [1] is the number of columns (clen), [2] is the number of rows in a block (blen), and [3] is the number of columns in a block (blen). Default (unknown) values are -1. Scalar values are all 0.
  - setFilename
```
public void setFilename(String passed)
```
    Specified by:
    
    setFilename in interface ParseInfo
  - setBeginLine
```
public void setBeginLine(int passed)
```
    Specified by:
    
    setBeginLine in interface ParseInfo
  - setBeginColumn
```
public void setBeginColumn(int passed)
```
    Specified by:
    
    setBeginColumn in interface ParseInfo
  - setEndLine
```
public void setEndLine(int passed)
```
    Specified by:
    
    setEndLine in interface ParseInfo
  - setEndColumn
```
public void setEndColumn(int passed)
```
    Specified by:
    
    setEndColumn in interface ParseInfo
  - setText
```
public void setText(String text)
```
    Specified by:
    
    setText in interface ParseInfo
  - setParseExceptionList
```
public void setParseExceptionList(ArrayList<String> passed)
```
  - setParseInfo
```
public void setParseInfo(ParseInfo parseInfo)
```
    Set parse information.
    
    Parameters:
    
    parseInfo - parse information, such as beginning line position, beginning column position, ending line position, ending column position, text, and filename
  - setCtxValues
```
public void setCtxValues(org.antlr.v4.runtime.ParserRuleContext ctx)
```
    Set ParserRuleContext values (begin line, begin column, end line, end column, and text).
    
    Parameters:
    
    ctx - the antlr ParserRuleContext
  - setCtxValuesAndFilename
```
public void setCtxValuesAndFilename(org.antlr.v4.runtime.ParserRuleContext ctx,
                                    String filename)
```
    Set ParserRuleContext values (begin line, begin column, end line, end column, and text) and file name.
    
    Parameters:
    
    ctx - the antlr ParserRuleContext
    
    filename - the filename (if it exists)
  - getFilename
```
public String getFilename()
```
    Specified by:
    
    getFilename in interface ParseInfo
  - getBeginLine
```
public int getBeginLine()
```
    Specified by:
    
    getBeginLine in interface ParseInfo
  - getBeginColumn
```
public int getBeginColumn()
```
    Specified by:
    
    getBeginColumn in interface ParseInfo
  - getEndLine
```
public int getEndLine()
```
    Specified by:
    
    getEndLine in interface ParseInfo
  - getEndColumn
```
public int getEndColumn()
```
    Specified by:
    
    getEndColumn in interface ParseInfo
  - getText
```
public String getText()
```
    Specified by:
    
    getText in interface ParseInfo
  - getParseExceptionList
```
public ArrayList<String> getParseExceptionList()
```
  - printErrorLocation
```
public String printErrorLocation()
```
  - printWarningLocation
```
public String printWarningLocation()
```
  - printInfoLocation
```
public String printInfoLocation()
```
    Return info message containing the filename, the beginning line position, and the beginning column position.
    
    Returns:
    
    the info message

Class Expression

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Expression

Method Detail

rewriteExpression

setOutput

getOutput

getOutputs

validateExpression

validateExpression

getBinaryOp

getRelationalOp

getBooleanOp

convertFormatType

getTempName

variablesRead

variablesUpdated

computeDataType

computeDataType

computeValueType

computeValueType

computeValueType

equals

hashCode

raiseValidateError

raiseValidateError

raiseValidateError

getBinaryMatrixCharacteristics

setFilename

setBeginLine

setBeginColumn

setEndLine

setEndColumn

setText

setParseExceptionList

setParseInfo

setCtxValues

setCtxValuesAndFilename

getFilename

getBeginLine

getBeginColumn

getEndLine

getEndColumn

getText

getParseExceptionList

printErrorLocation

printWarningLocation

printInfoLocation