org.epics.pvmanager.data
Class ExpressionLanguage

java.lang.Object
  org.epics.pvmanager.data.ExpressionLanguage

public class ExpressionLanguage
extends java.lang.Object

PVManager expression language support for EPICS types.

Author:

carcassi

vDoubleOf

@Deprecated
public static SourceRateExpression<VDouble> vDoubleOf(SourceRateExpression<?> expression)

Deprecated. use vNumber(java.lang.String)

Expects a numeric scalar (VDouble or VInt) and converts it to a VDouble.

Parameters:

expression - an expression that returns a numeric scalar

Returns:

a new expression

vDoubleArrayOf

@Deprecated
public static SourceRateExpression<VDoubleArray> vDoubleArrayOf(SourceRateExpression<?> expression)

Deprecated. use vNumberArray(java.lang.String)

Expects a numeric array (VDoubleArray, VFloatArray, VIntArray, VShortArray or VByteArray) and converts it to a VDoubleArray.

Parameters:

expression - an expression that returns a numeric array

Returns:

a new expression

vDoubleArrayOf

public static DesiredRateExpression<VDoubleArray> vDoubleArrayOf(DesiredRateExpressionList<? extends VNumber> expressions)

Transforms a list of numeric scalar into a double array.

Parameters:

expressions - a list of numeric expressions

Returns:

a new double array expression

vType

public static ChannelExpression<VType,java.lang.Object> vType(java.lang.String name)

A channel with the given name that returns any of the value type.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vNumber

public static ChannelExpression<VNumber,java.lang.Number> vNumber(java.lang.String name)

A channel with the given name of type VNumber.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vDouble

public static ChannelExpression<VDouble,java.lang.Double> vDouble(java.lang.String name)

A channel with the given name of type VDouble.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vInt

public static ChannelExpression<VInt,java.lang.Integer> vInt(java.lang.String name)

A channel with the given name of type VInt.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vNumberArray

public static ChannelExpression<VNumberArray,ListNumber> vNumberArray(java.lang.String name)

A channel with the given name of type VNumberArray.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vFloatArray

public static ChannelExpression<VFloatArray,float[]> vFloatArray(java.lang.String name)

A channel with the given name of type VFloatArray.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vDoubleArray

public static ChannelExpression<VDoubleArray,float[]> vDoubleArray(java.lang.String name)

A channel with the given name of type VDoubleArray.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vByteArray

public static ChannelExpression<VByteArray,byte[]> vByteArray(java.lang.String name)

A channel with the given name of type VByteArray.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vShortArray

public static ChannelExpression<VShortArray,short[]> vShortArray(java.lang.String name)

A channel with the given name of type VShortArray.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vIntArray

public static ChannelExpression<VIntArray,int[]> vIntArray(java.lang.String name)

A channel with the given name of type VIntArray.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vString

public static ChannelExpression<VString,java.lang.String> vString(java.lang.String name)

A channel with the given name of type VString.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vStringArray

public static ChannelExpression<VStringArray,java.lang.String[]> vStringArray(java.lang.String name)

A channel with the given name of type VStringArray.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vEnum

public static ChannelExpression<VEnum,java.lang.Integer> vEnum(java.lang.String name)

A channel with the given name of type VEnum.

Parameters:

name - the channel name; can't be null

Returns:

an expression representing the channel

vDoubles

public static ChannelExpressionList<VDouble,java.lang.Double> vDoubles(java.util.List<java.lang.String> names)

A list of channels with the given names, all of type VDouble.

Parameters:

names - the channel names; can't be null

Returns:

a list of expressions representing the channels

vConst

public static DesiredRateExpression<VDouble> vConst(double value)

A constant representing a double. Alarm will be none, timestamp now and no display information.

Parameters:

value - the constant value

Returns:

a double expression

vConst

public static DesiredRateExpression<VInt> vConst(int value)

A constant representing an int. Alarm will be none, timestamp now and no display information.

Parameters:

value - the constant value

Returns:

an int expression

vConst

public static DesiredRateExpression<VDoubleArray> vConst(double... values)

A constant representing a double array. Alarm will be none, timestamp now and no display information.

Parameters:

values - the constant values

Returns:

a double array expression

vConst

public static DesiredRateExpression<VDoubleArray> vConst(ListDouble values)

A constant representing a double array. Alarm will be none, timestamp now and no display information.

Parameters:

values - the constant values

Returns:

a double array expression

vConst

public static DesiredRateExpression<VIntArray> vConst(ListInt values)

A constant representing an int array. Alarm will be none, timestamp now and no display information.

Parameters:

values - the constant values

Returns:

an int array expression

vDoubleConstants

public static DesiredRateExpressionList<VDouble> vDoubleConstants(java.util.List<java.lang.Double> values)

A list of constant expressions of type VDouble.

Parameters:

values - the list of constants

Returns:

a list of double expression

vIntConstants

public static DesiredRateExpressionList<VInt> vIntConstants(java.util.List<java.lang.Integer> values)

A list of constant expressions of type VDouble.

Parameters:

values - the list of constants

Returns:

a list of int expression

vStringConstants

public static DesiredRateExpressionList<VString> vStringConstants(java.util.List<java.lang.String> values)

A list of constant expressions of type VString.

Parameters:

values - the list of constants

Returns:

a list of string expression

averageOf

public static DesiredRateExpression<VDouble> averageOf(SourceRateExpression<VDouble> doublePv)

Aggregates the sample at the scan rate and takes the average.

Parameters:

doublePv - the expression to take the average of; can't be null

Returns:

an expression representing the average of the expression

statisticsOf

public static DesiredRateExpression<VStatistics> statisticsOf(SourceRateExpression<VDouble> doublePv)

Aggregates the sample at the scan rate and calculates statistical information.

Parameters:

doublePv - the expression to calculate the statistics information on; can't be null

Returns:

an expression representing the statistical information of the expression

statisticsOf

public static DesiredRateExpressionList<VStatistics> statisticsOf(SourceRateExpressionList<VDouble> doubleExpressions)

Applies statisticsOf(org.epics.pvmanager.expression.SourceRateExpression) to all arguments.

Parameters:

doubleExpressions - a list of double expressions

Returns:

a list of statistical expressions

synchronizedArrayOf

public static DesiredRateExpression<VMultiDouble> synchronizedArrayOf(TimeDuration tolerance,
                                                                      SourceRateExpressionList<VDouble> expressions)

A synchronized array from the given expression.

Parameters:

tolerance - maximum time difference between samples

expressions - the expressions from which to reconstruct the array

Returns:

an expression for the array

synchronizedArrayOf

public static DesiredRateExpression<VMultiDouble> synchronizedArrayOf(TimeDuration tolerance,
                                                                      TimeDuration cacheDepth,
                                                                      SourceRateExpressionList<VDouble> expressions)

A synchronized array from the given expression.

Parameters:

tolerance - maximum time difference between samples in the reconstructed array

cacheDepth - maximum time difference between samples in the caches used to reconstruct the array

expressions - the expressions from which to reconstruct the array

Returns:

an expression for the array

column

public static VTableColumn column(java.lang.String name,
                                  DesiredRateExpressionList<?> values)

A column for an aggregated vTable.

Parameters:

name - the name of the column

values - the value of the column

Returns:

the column

vTable

public static DesiredRateExpression<VTable> vTable(VTableColumn... columns)

Creates a vTable by aggregating different values from different pvs.

Parameters:

columns - columns of the table

Returns:

an expression for the table