scala.xml

Equality

object Equality

In an attempt to contain the damage being inflicted on consistency by the ad hoc equals methods spread around xml, the logic is centralized and all the xml classes go through the xml.Equality trait. There are two forms of xml comparison.

  1. def strict_==(other: scala.xml.Equality)

This one tries to honor the little things like symmetry and hashCode contracts. The equals method routes all comparisons through this.

  1. xml_==(other: Any)

This one picks up where strict_== leaves off. It might declare any two things equal.

As things stood, the logic not only made a mockery of the collections equals contract, but also laid waste to that of case classes.

Among the obstacles to sanity are/were:

Node extends NodeSeq extends Seq[Node] MetaData extends Iterable[MetaData] The hacky "Group" xml node which throws exceptions with wild abandon, so don't get too close Rampant asymmetry and impossible hashCodes Most classes claiming to be equal to "String" if some specific stringification of it was the same. String was never going to return the favor.

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  1. final def !=(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

    Definition Classes
    AnyRef → Any

  3. final def ==(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  4. final def asInstanceOf[T0]: T0

    Definition Classes
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  5. def asRef(x: Any): AnyRef

  6. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  7. def compareBlithely(x1: AnyRef, x2: AnyRef): Boolean

  8. def compareBlithely(x1: AnyRef, x2: Node): Boolean

  9. def compareBlithely(x1: AnyRef, x2: String): Boolean

    Note - these functions assume strict equality has already failed.

  10. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  11. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  12. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
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    Annotations
    @throws( classOf[java.lang.Throwable] )

  13. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any

  14. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  15. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  16. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  17. final def notify(): Unit

    Definition Classes
    AnyRef

  18. final def notifyAll(): Unit

    Definition Classes
    AnyRef

  19. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
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  20. def toString(): String

    Definition Classes
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  21. final def wait(): Unit

    Definition Classes
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    @throws( ... )

  22. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
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    @throws( ... )

  23. final def wait(arg0: Long): Unit

    Definition Classes
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    @throws( ... )