Invokes the argument visitor based on the kind of this version range object.

This method equals to the following based on the type of this object:

 return visitor.accept(this, param);
 

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the Object.equals(Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

Checks if this version range can accept the argument version number.

Note that when working with BundleIdentifiers, any version qualifiers should be converted to version numbers.

Converts this version range to a semantically same string version range representation. The resulting string can be passed to valueOf(String), which will result in a VersionRange that equals to this.

Returns a string representation of the object.In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Parses a string in version range format and creates a VersionRange object.

This method will analyze the argument and convert it to a VersionRange object. The expected format can contain the following:

• Number: A version number in the format defined by BundleIdentifier. It must be one or more non-negative integers separated by dot ('.') characters. E.g. 1.2.3

  Numbers without any enclosing range declaration will allow any versions that start with the given number. E.g. the input 1.2 allows 1.2, 1.2.0, 1.2.1, and any following version numbers up until 1.3.

• Range: Two version numbers separated by comma (',') enclosed in either parentheses ('(' and ')') or brackets ('[' and ']'). The kind of enclosing characters may be used together. The enclosing characters correspond to the same semantics as in the notation used by intervals in mathematics. (Parentheses for open ended (exclusive) ranges, and brackets for closed (inclusive) ranges.)

  The right side of the range must be greater than the left side.

  E.g. [1, 2) includes any version starting from 1 and is smaller than 2.

• Singular range: A range declaration that only contains one version number. It can have three formats:
  • [1.0): meaning versions at least 1.0, without any upper bound.
  • (1.0]: meaning versions at most 1.0, without any lower bound. (The range is inclusive for 1.0.) This is semantically same as [0, 1.0], as the version 0 is the first one in order.
  • [1.0]: meaning exactly the version 1.0
  Note that a singular version range with parentheses on both end is illegal.
• Union relation: Any of the components can be enclosed in curly braces ('{' and '}) and separated by vertical bars ('|'). This declaration will enable versions matched by any of its compontents. E.g. {[1.0] | [2.0]} matches only the versions 1.0 and 2.0. Note that an union declaration without any components is considered to include no versions.
• Intersection relation: Any of the components can be enclosed in intersection relation with each other. The '&' character can be used to require that all parts of the input is satisfied. This relation exists for completeness of the version range format, and we haven't found a significant use-case for it as of yet. In general, intersections can be represented in a range based way more appropriately.

Examples:

• 1.0: Includes any version greater or equal to 1.0 and less than 1.1. Semantically same as [1.0, 1.1).
• {1 | 3}: Includes versions starting with 1 or 3, but doesn't include versions with other starting components.
  Included examples: 1, 1.0, 1.1, 3, 3.2
  Not included examples: 2, 2.0, 4.0
• {}: Doesn't include any versions. Unsatisfiable.
• (1.1, 1.4): Includes versions greater than 1.1 and less than 1.4.
  Included examples: 1.1.0, 1.1.1, 1.2, 1.3.9, 1.3.9.0
  Not included examples: 1.0, 1.1, 1.4, 1.4.0
• {1.0}: Same as 1.0.

Calling toString() on the result, and valueOf(String) again will result in a new VersionRange that equals to the returned one.

The method may return a version range that doesn't exactly match the input, but only semantically. Meaning that it may perform some optimizations.