List of uniqueIdentifier() Examples

Examples of uniqueIdentifier()

com.ajjpj.amapper.core.AIdentifierExtractor.uniqueIdentifier()
Used to qualify the path segment in a collection mapping, or more generally to identify an object in the mapper's output. The mapper uses these identifiers when mapping collections to minimize changes to the target. They also qualify paths segments for collection elements, and application code may depend on them, especially when processing the result of a 'diff'.
The following properties are often desirable for uniqueIdentifier implementations (pretty much the same criteria that apply to good 'business keys' in persistent storage):
- stable: Running the same code with the same data returns the same key every time (as opposed to e.g. System.identityHashCode). For partially initialized or uninitialized objects, this criterion can often be skipped. Make sure that even for those objects, uniqueness is maintained!
- unique: "Different" elements have different identifiers, i.e. from an application perspective - old and new versions of the "same" element might well have the same identifier
- selective: Several versions of the "same" element have the same identifier - e.g. correcting a typo in a person's name does not change that person's identifier
- cheap: Identifiers are repeatedly calculated, and implementations assume that these calculations are not exensive.
- serializable / human readable: is often a direct consequence of "stable"
@param types contains the qualified type of the object that is passed in, as well as the type in terms of which it is viewed.
This information be redundant for some domains, e.g. for Java Beans. In other domains, an object's 'AType' may not be easily retrieved from the object, e.g. because all objects are represented by Map instances. So use what you need, and feel free to ignore the rest.

Examples of com.ajjpj.amapper.core.AIdentifierExtractor.uniqueIdentifier()


        if (targetColl.isEmpty()) {
            int index=0;
            // this is an optimization for the common case that the target collection is initially empty
            for (Object s: sourceColl) {
                final APath elPath = path.withElementChild (index++, identifierExtractor.uniqueIdentifier (s, types.source (), types.target ()));
                final AOption<Object> optT = worker.map (elPath, s, null, elementTypes, context);
                if (optT.isDefined()) {
                    targetColl.add(optT.get());
                }
            }

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Examples of com.ajjpj.amapper.core.AIdentifierExtractor.uniqueIdentifier()

            return h.fromJuCollection(targetColl, types.target());
        }


        final APredicate2NoThrow<Object, Object> eqPredicate = new APredicate2NoThrow<Object, Object> () {
            @Override public boolean apply (Object param1, Object param2) {
                final Object sourceIdent = identifierExtractor.uniqueIdentifier (param1, types.source (), types.target ());
                final Object targetIdent = identifierExtractor.uniqueIdentifier (param2, types.target (), types.target ());
                return Objects.equals (sourceIdent, targetIdent);
            }
        };

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Examples of com.ajjpj.amapper.core.AIdentifierExtractor.uniqueIdentifier()

        }


        final APredicate2NoThrow<Object, Object> eqPredicate = new APredicate2NoThrow<Object, Object> () {
            @Override public boolean apply (Object param1, Object param2) {
                final Object sourceIdent = identifierExtractor.uniqueIdentifier (param1, types.source (), types.target ());
                final Object targetIdent = identifierExtractor.uniqueIdentifier (param2, types.target (), types.target ());
                return Objects.equals (sourceIdent, targetIdent);
            }
        };


        final AObjectHolder<Integer> index = new AObjectHolder<> (0);

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Examples of com.ajjpj.amapper.core.AIdentifierExtractor.uniqueIdentifier()

        };


        final AObjectHolder<Integer> index = new AObjectHolder<> (0);
        final AFunction2NoThrow <Object, Object, AOption<Object>> mapFunction = new AFunction2NoThrow<Object, Object, AOption<Object>> () {
            @Override public AOption<Object> apply (Object s, Object t) {
                final APath elPath = path.withElementChild (index.value++, identifierExtractor.uniqueIdentifier (s, types.source (), types.target ()));
                return worker.map (elPath, s, t, elementTypes, context);
            }
        };


        LevenshteinDistance<Object, Object> levenshteinDistance = new LevenshteinDistance<> (sourceColl, targetColl, eqPredicate);

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Examples of com.ajjpj.amapper.core.AIdentifierExtractor.uniqueIdentifier()


        final AIdentifierExtractor identifierExtractor = worker.getIdentifierExtractor();


        final APredicate2NoThrow <Object, Object> equalsPredicate = new APredicate2NoThrow<Object, Object> () {
            @Override public boolean apply (Object param1, Object param2) {
                final Object ident1 = identifierExtractor.uniqueIdentifier (param1, types.source(), types.target());
                final Object ident2 = identifierExtractor.uniqueIdentifier (param2, types.source(), types.target());
                return Objects.equals (ident1, ident2);
            }
        };

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Examples of com.ajjpj.amapper.core.AIdentifierExtractor.uniqueIdentifier()

        final AIdentifierExtractor identifierExtractor = worker.getIdentifierExtractor();


        final APredicate2NoThrow <Object, Object> equalsPredicate = new APredicate2NoThrow<Object, Object> () {
            @Override public boolean apply (Object param1, Object param2) {
                final Object ident1 = identifierExtractor.uniqueIdentifier (param1, types.source(), types.target());
                final Object ident2 = identifierExtractor.uniqueIdentifier (param2, types.source(), types.target());
                return Objects.equals (ident1, ident2);
            }
        };


        LevenshteinDistance<Object, Object> levenshtein = new LevenshteinDistance<> (newColl, oldColl, equalsPredicate);

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