CompareTo Semantics[通俗易懂]

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For the property types other than BOOLEAN, NAME, PATH and BINARY, comparison relationsare defined in terms of the result of the compareTo method oninstances V1 and V2 of the Java classcorresponding to the JCR property type (see each section below for the relevantclass). For those types:

·        V₁ is equal to V₂if and only if V1.compareTo(V2) == 0.

·        V₁ is ordered before V₂if and only if V1.compareTo(V2) < 0.

·        V₁ is ordered after V₂if and only if V1.compareTo(V2) > 0.

STRING ，URL，REFFERENCE  and    WEAKREFERENCE

If V₁and V₂ are values of type STRING, URI, REFERENCE or WEAKREFERENCE then the repository shoulduse the semantics of java.lang.String.compareTo, as described in CompareToSemantics.

DATE

If V₁and V₂ are values of type DATE then the repository mustuse the semantics of java.lang.Calendar.compareTo, as described in  CompareToSemantics.

DOUBLE

If V₁and V₂ are values of type DOUBLE then the repository mustuse the semantics of java.lang.Double.compareTo, as described in CompareToSemantics.

Long

If V₁and V₂ are values of type LONG then the repository mustuse the semantics of java.lang.Long.compareTo, as described in  CompareToSemantics.

DECIMAL

If V₁and V₂ are values of type DECIMAL then the repository mustuse the semantics of java.lang.BigDecimal.compareTo, as described in  CompareToSemantics.

BOOLEAN

If V₁and V₂ are values of type BOOLEAN then

·        V₁ is equal to V₂if and only if V1 == V2.

·        V₁ is ordered before V₂if and only if V1 == false and V2 == true.

·        V₁ is ordered after V₂if and only if V1 == true and V2 == false.

NAME

If V₁and V₂ are values of type NAME and V₁ = (N₁, L₁) and V₂= (N₂, L₂) where N₁ and N₂ are JCR namespaces and L₁ and L₂are JCR local names then

·        V₁ is equal to V₂if and only if N₁ is equalto N₂ and L₁ is equal to L₂, according to thesemantics of String.compareTo (see §3.2.7Equality of Names).

·        Ordering isimplementation-specific. The only requirement is that a total order on values of type NAME must be defined,meaning that if V₁ and V₂ are not equal then either V₁ is ordered before V₂ or V₁ is ordered after V₂.

PATH

If V₁and V₂ are values of type PATH then

·        V₁ is equal to V₂if and only if V₁ and V₂ are segment-equal (see §3.3.8 Equalityof Paths).

·        Ordering isimplementation-specific. The only requirement is that a total order on values of type PATH must be defined,meaning that if V₁ and V₂ are not equal then either V₁ is ordered before V₂ or V₁ is ordered after V₂.

BINARY

If V₁and V₂ are values of type BINARY and given,

·        V₁ is equal to V₂if and only if V₁ and V₂ are bitwise equivalent.

·        Ordering is implementation-specific.