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## gnu.prolog.term
Class CompoundTermTag

    java.lang.Object
      gnu.prolog.term.CompoundTermTag

All Implemented Interfaces:
  Serializable

    public final class CompoundTermTag

extends Object
implements Serializable

A tag of compound term. A tag consists of functor and arity. All tags are unique in one JVM.

Version:
  0.0.1
Author:
  Constatine Plotinikov
See Also:
  Serialized Form

Field Summary
`int` | `arity` arity of term.
`static CompoundTermTag` | `comma` comma tag
`static CompoundTermTag` | `curly1` '{}'/1 tag
`static CompoundTermTag` | `divide2` '/'/2 tag
`AtomTerm` | `functor` a functor of term
`static CompoundTermTag` | `minus2` '-'/2 tag

Constructor Summary
`protected` | `CompoundTermTag(AtomTerm f, int a)` a constructor

Method Summary
`boolean` | `equals(Object obj)`
`static CompoundTermTag` | `get(AtomTerm functor, int arity)` get compound term tag
`static CompoundTermTag` | `get(CompoundTerm predicateIndicator)` get compound term tag
`static CompoundTermTag` | `get(String functor, int arity)` get compound term tag
`CompoundTerm` | `getPredicateIndicator()` get predicate indicator for this tag
`int` | `hashCode()`
`static boolean` | `isPredicateIndicator(Term term)` check if term is predicate indicator
`Object` | `readResolve()` Return an object to replace the object extracted from the stream.
`String` | `toString()` convert tag to string

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

Field Detail

### comma

    public static final CompoundTermTag comma

  comma tag

### curly1

    public static final CompoundTermTag curly1

  '{}'/1 tag

### minus2

    public static final CompoundTermTag minus2

  '-'/2 tag

### divide2

    public static final CompoundTermTag divide2

  '/'/2 tag

### functor

    public final AtomTerm functor

  a functor of term

### arity

    public final int arity

  arity of term. Arity of tag could be 0. But in this case this tag could not be used to cunstruct the compound terms.

Constructor Detail

### CompoundTermTag

    protected CompoundTermTag(AtomTerm f,
                              int a)

  a constructor

  Parameters:
    `f` - functor of term
    `a` - arity of term

Method Detail

### getPredicateIndicator

    public CompoundTerm getPredicateIndicator()

  get predicate indicator for this tag

  Returns:
    the predicate indicator for this tag

### get

    public static CompoundTermTag get(CompoundTerm predicateIndicator)

  get compound term tag

  Parameters:
    `predicateIndicator` - a term which represent a predicate indicator of term
  Returns:
    a tag that have specified by a term which represent a predicate indicator of term
  Throws:
    `IllegalArgumentException` - if term is not a valid predicate indicator

### isPredicateIndicator

    public static boolean isPredicateIndicator(Term term)

  check if term is predicate indicator

  Parameters:
    `term` - term to check
  Returns:
    true if term is predicate indicator

### get

    public static CompoundTermTag get(String functor,
                                      int arity)

  get compound term tag

  Parameters:
    `functor` - functor of tag
    `arity` - arity of tag
  Returns:
    a tag that have specified arity ond functor

### get

    public static CompoundTermTag get(AtomTerm functor,
                                      int arity)

  get compound term tag

  Parameters:
    `functor` - functor of tag
    `arity` - arity of tag
  Returns:
    a tag that have specified arity ond functor

### readResolve

    public Object readResolve()

  Return an object to replace the object extracted from the stream. The object will be used in the graph in place of the original.

  Returns:
    resolved object
  See Also:
    `Resolvable`

### toString

    public String toString()

  convert tag to string

  Overrides:
    `toString` in class `Object`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`

### equals

    public boolean equals(Object obj)

  Overrides:
    `equals` in class `Object`

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