Interface ValueIterator


public interface ValueIterator

Interface for enabling iteration over sets of <int, Object>, where int is the sorted integer index in ascending order, and Object its associated value.

The ValueIterator allows iterations over integer indexes in the range of Integer.MIN_VALUE to Integer.MAX_VALUE inclusive. Implementations of ValueIterator should specify their own maximum subrange within the above range that is meaningful to its applications.

Most implementations will be created by factory methods, such as the character name iterator in UCharacter.getNameIterator. See example below. Example of use:

 ValueIterator iterator = UCharacter.getNameIterator();
 ValueIterator.Element result = new ValueIterator.Element();
 iterator.setRange(UCharacter.MIN_VALUE, UCharacter.MAX_VALUE);
 while (iterator.next(result)) {
     System.out.println("Codepoint \\u" +
                        Integer.toHexString(result.integer) +
                        " has the character name " + (String)result.value);
 }
 
Author:
synwee
  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Interface
    Description
    static final class 
    The return result container of each iteration.
  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    Returns the next result for this iteration and returns true if we are not at the end of the iteration, false otherwise.
    void
    Resets the iterator to start iterating from the integer index Integer.MIN_VALUE or X if a setRange(X, Y) has been called previously.
    void
    setRange(int start, int limit)
    Restricts the range of integers to iterate and resets the iteration to begin at the index argument start.
  • Method Details

    • next

      boolean next(ValueIterator.Element element)

      Returns the next result for this iteration and returns true if we are not at the end of the iteration, false otherwise.

      If this returns a false, the contents of elements will not be updated.

      Parameters:
      element - for storing the result index and value
      Returns:
      true if we are not at the end of the iteration, false otherwise.
      See Also:
    • reset

      void reset()

      Resets the iterator to start iterating from the integer index Integer.MIN_VALUE or X if a setRange(X, Y) has been called previously.

    • setRange

      void setRange(int start, int limit)

      Restricts the range of integers to iterate and resets the iteration to begin at the index argument start.

      If setRange(start, end) is not performed before next(element) is called, the iteration will start from the integer index Integer.MIN_VALUE and end at Integer.MAX_VALUE.

      If this range is set outside the meaningful range specified by the implementation, next(element) will always return false.

      Parameters:
      start - first integer in the range to iterate
      limit - one more than the last integer in the range
      Throws:
      IllegalArgumentException - thrown when attempting to set an illegal range. E.g limit <= start