attrData-class {graph} | R Documentation

## Class "attrData"

### Description

A container class to manage generic attributes. Supports named attributes with default values with methods for vectorized access.

### Objects from the Class

Objects can be created by calls of the form `new("attrData", defaults)`. The `defaults` argument should be a named list containing the initial attribute names and default values.

### Slots

`data`:

  Where custom attribute data is stored

`defaults`:

  A named list of known attribute names and defualt values.

### Methods

attrDataItem<-

  `signature(self = "attrData", x = "character", attr = "character")`: ...

attrDataItem

  `signature(self = "attrData", x = "character", attr = "missing")`: ...

attrDataItem

  `signature(self = "attrData", x = "character", attr = "character")`: ...

attrDefaults<-

  `signature(self = "attrData", attr = "character", value = "ANY")`: ...

attrDefaults<-

  `signature(self = "attrData", attr = "missing", value = "list")`: ...

attrDefaults

  `signature(self = "attrData", attr = "missing")`: ...

attrDefaults

  `signature(self = "attrData", attr = "character")`: ...

initialize

  `signature(.Object = "attrData")`: ...

names

  return the names of the stored attributes

names<-

  set the names of the stored attributes

removeAttrDataItem

  `signature(self="attrData", x="character", value="NULL")`: Remove the data associated with the key specified by `x`.

### Author(s)

Seth Falcon

### Examples

    defaultProps <- list(weight=1, color="blue", friends=c("Bob", "Alice"))
    adat <- new("attrData", defaults=defaultProps)

    ## Get all defaults
    attrDefaults(adat)

    ## Or get only a specific attribute
    attrDefaults(adat, attr="color")

    ## Update default weight
    attrDefaults(adat, attr="weight") <- 500

    ## Add new attribute
    attrDefaults(adat, attr="length") <- 0

    ## Asking for the attributes of an element you haven't customized
    ## returns the defaults
    attrDataItem(adat, x=c("n1", "n2"), attr="length")

    ## You can customize values
    attrDataItem(adat, x=c("n1", "n2"), attr="length") <- 5

    ## What keys have been customized?
    names(adat)

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