Class Path

java.lang.Object
ch.tocco.nice2.persist.core.api.entity.Path
All Implemented Interfaces:
Serializable
public final class Path extends Object implements Serializable
Path class for working with entity field and relation paths. 

Example usage:
  Path path = Path.parse("someRel.anotherRel.aField");
  FieldModel fieldModel = (FieldModel) path.resolve(myEntityModelThatHasSomeRel);

Note: Features are turned off by default! 

Example with features:
  Path path = Path.parse("someRel[myselector].anotherRel?.aField", Path.Feature.SELECTORS, Path.Feature.OPTIONALS)
See Also:

  • Constructor Details

  • Method Details

    • parse

      public static Path parse(String path) throws IllegalArgumentException
      Parses the given string path into a path object and returns it.

      NOTE that this method is not too picky and does not try to resolve; invalid stuff will be detected in the resolve(EntityModel, Path.Feature...) method.

      Chunks that are given single-quoted like 'foo' lose the quotes here, calls to get(int) etc. will be without.

      Parameters:
      path - For example "someRel.someField" or "'someRel'.'someField'". Will be trimmed, may not be empty.
      Returns:
      The parsed path object
      Throws:
      IllegalArgumentException - On illegal syntax or empty input.

    • parse

      public static Path parse(String path, Path.Feature... features) throws IllegalArgumentException
      Throws:
      IllegalArgumentException

    • getFullPaths

      public List<Path> getFullPaths()
      Returns:
      all paths (including all sub paths rewritten as a full path)

    • equals

      public boolean equals(Object o)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object
      Returns:
      A machine-usable, re-parsable representation of the path, which happens to be very human-readable too.

    • toString

      public String toString(boolean quoteIdentifiers)

    • length

      public int length()

    • get

      public Path.PathElement get(int index)

    • getHead

      public Path.PathElement getHead()

    • getHead

      public Path getHead(int count)

    • getTail

      public Path.PathElement getTail()

    • getTail

      public Path getTail(int count)

    • stepUp

      public Path stepUp()
      Example: "aa.bb.cc" → "aa.bb"
      Returns:
      A new path without the last element.
      Throws:
      IndexOutOfBoundsException - If the path contains just one element.

    • stepDown

      public Path stepDown()
      Example: "aa.bb.cc" → "bb.cc"
      Returns:
      A new path without the first element.
      Throws:
      IndexOutOfBoundsException - If the path contains just one element.

    • hasFeature

      public boolean hasFeature(Path.Feature feature)

    • stripFeatures

      public Path stripFeatures(Path.Feature... features)

    • resolve

      public ModelElement resolve(EntityModel source, Path.Feature... features)
      Resolves the last element of this path and returns its model.
      Parameters:
      source - The model of the first element to start resolving.
      features - Enabled path features.
      Returns:
      Either an instance of FieldModel or RelationModel.
      Throws:
      PersistException - On a syntax or model error. Never contacts the persistence layer so it's more of a model exception.

    • resolveToLastEntity

      public Path.LastEntityResult resolveToLastEntity(EntityModel source, Path.Feature... features)
      Resolves the path to the last entity, returning that entity's model plus the path element after it.

      Example:

        Path "someRel.otherRel.someField"
   - The returned EntityModel is the target entity of the "otherRel" relation.
   - The returned PathElement is for the "someField", which is either for a standard field,
     for a localized field, or for a relation. If it is for a localized field then it may
     be just its base name.
      Parameters:
      source - The model of the first element to start resolving.
      features - Enabled path features.
      Throws:
      PersistException - On a syntax or model error. Never contacts the persistence layer so it's more of a model exception.

    • resolve

      public <T extends Path.Resolver> T resolve(EntityModel source, T resolver, Path.Feature... features)
      Resolves this path using a resolver.
      Parameters:
      source - The model of the first element to start resolving.
      resolver - A handler that handlers each step in the path.
      features - Enabled path features.
      Returns:
      The passed in resolver.
      Throws:
      PersistException - On a syntax or model error. Never contacts the persistence layer so it's more of a model exception.