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## jif.types.label
Class AccessPathConstant

    java.lang.Object
      jif.types.label.AccessPath
          jif.types.label.AccessPathRoot
              jif.types.label.AccessPathConstant

All Implemented Interfaces:
  java.io.Serializable

    public class AccessPathConstant

extends AccessPathRoot

Represents a final access path consisting of a constant label or principal, that is, either a NewLabel expression or an External principal. For example, "new label {Alice:}" or "Alice". These access paths only arise during method instantiation. For example, given a method

        int{*lb} m(label{} lb);

and a call site

        m(new label{Alice:});

the type system needs to be precise enough to realize that the method call returns an int with label {Alice:}. This is achieved through the use of AccessPathConstants.

See Also:
  `AccessPath`, `JifUtil.exprToAccessPath(Expr, JifContext)`, Serialized Form

Constructor Summary
`AccessPathConstant(Label label, polyglot.types.Type type, polyglot.util.Position pos)`
`AccessPathConstant(Principal principal, polyglot.types.Type type, polyglot.util.Position pos)`

Method Summary
`java.lang.Object` | `constantValue()`
`boolean` | `equals(java.lang.Object o)`
`int` | `hashCode()`
`boolean` | `isCanonical()`
`boolean` | `isLabelConstant()`
`boolean` | `isNeverNull()`
`boolean` | `isPrincipalConstant()`
`AccessPath` | `subst(AccessPathRoot r, AccessPath e)` Return the result of substituting the root r with the access path e.
`java.lang.String` | `toString()`
`polyglot.types.Type` | `type()` The type of the access path (when the access path is regarded as an expression).

Methods inherited from class jif.types.label.AccessPathRoot
`equivalentTo, isUninterpreted, labelcheck, root`

Methods inherited from class jif.types.label.AccessPath
`exprString, position, throwTypes, verify`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### AccessPathConstant

    public AccessPathConstant(Label label,
                              polyglot.types.Type type,
                              polyglot.util.Position pos)

### AccessPathConstant

    public AccessPathConstant(Principal principal,
                              polyglot.types.Type type,
                              polyglot.util.Position pos)

Method Detail

### constantValue

    public java.lang.Object constantValue()

### isLabelConstant

    public boolean isLabelConstant()

### isNeverNull

    public boolean isNeverNull()

  Specified by:
    `isNeverNull` in class `AccessPath`

### isPrincipalConstant

    public boolean isPrincipalConstant()

### isCanonical

    public boolean isCanonical()

  Specified by:
    `isCanonical` in class `AccessPath`

### subst

    public AccessPath subst(AccessPathRoot r,
                            AccessPath e)

  Description copied from class: `AccessPath`
  Return the result of substituting the root r with the access path e. For example, given a field access path "this.f", substituting the access path root "this" for the access path "o.g" will result in the access path "o.g.f". This method is used to instantiate procedures for calls, and labels of fields.

  Specified by:
    `subst` in class `AccessPath`

### toString

    public java.lang.String toString()

  Overrides:
    `toString` in class `java.lang.Object`

### equals

    public boolean equals(java.lang.Object o)

  Specified by:
    `equals` in class `AccessPath`

### hashCode

    public int hashCode()

  Specified by:
    `hashCode` in class `AccessPath`

### type

    public polyglot.types.Type type()

  Description copied from class: `AccessPath`
  The type of the access path (when the access path is regarded as an expression).

  Specified by:
    `type` in class `AccessPath`

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