ICharacterIterator Interface

Definition

[Android.Runtime.Register("java/text/CharacterIterator", "", "Java.Text.ICharacterIteratorInvoker")]
public interface ICharacterIterator : IDisposable, Java.Interop.IJavaPeerable, Java.Lang.ICloneable

[<Android.Runtime.Register("java/text/CharacterIterator", "", "Java.Text.ICharacterIteratorInvoker")>]
type ICharacterIterator = interface
    interface ICloneable
    interface IJavaObject
    interface IDisposable
    interface IJavaPeerable

Derived

Java.Text.IAttributedCharacterIterator

Java.Text.StringCharacterIterator

Attributes

RegisterAttribute

Implements

IJavaObject IJavaPeerable ICloneable IDisposable

Remarks

This interface defines a protocol for bidirectional iteration over text. The iterator iterates over a bounded sequence of characters. Characters are indexed with values beginning with the value returned by getBeginIndex() and continuing through the value returned by getEndIndex()-1.

Iterators maintain a current character index, whose valid range is from getBeginIndex() to getEndIndex(); the value getEndIndex() is included to allow handling of zero-length text ranges and for historical reasons. The current index can be retrieved by calling getIndex() and set directly by calling setIndex(), first(), and last().

The methods previous() and next() are used for iteration. They return DONE if they would move outside the range from getBeginIndex() to getEndIndex() -1, signaling that the iterator has reached the end of the sequence. DONE is also returned by other methods to indicate that the current index is outside this range.

Examples:

Traverse the text from start to finish

{@code
            public void traverseForward(CharacterIterator iter) {
                for(char c = iter.first(); c != CharacterIterator.DONE; c = iter.next()) {
                    processChar(c);
                }
            }
            }

Traverse the text backwards, from end to start

{@code
            public void traverseBackward(CharacterIterator iter) {
                for(char c = iter.last(); c != CharacterIterator.DONE; c = iter.previous()) {
                    processChar(c);
                }
            }
            }

Traverse both forward and backward from a given position in the text. Calls to notBoundary() in this example represents some additional stopping criteria.

{@code
            public void traverseOut(CharacterIterator iter, int pos) {
                for (char c = iter.setIndex(pos);
                         c != CharacterIterator.DONE && notBoundary(c);
                         c = iter.next()) {
                }
                int end = iter.getIndex();
                for (char c = iter.setIndex(pos);
                        c != CharacterIterator.DONE && notBoundary(c);
                        c = iter.previous()) {
                }
                int start = iter.getIndex();
                processSection(start, end);
            }
            }

Added in 1.1.

Java documentation for java.text.CharacterIterator.

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Fields

Properties

Methods

Extension Methods

Applies to