Class MatcherInput

java/com/google/re2j/MatcherInput.java:14–105

Abstract the representations of input text supplied to Matcher.

 * Abstract the representations of input text supplied to Matcher.
 */
abstract class MatcherInput {

  enum Encoding {
    UTF_16,
    UTF_8,
  }

  /**
   * Return the MatcherInput for UTF_16 encoding.
   */
  static MatcherInput utf16(CharSequence charSequence) {
    return new Utf16MatcherInput(charSequence);
  }

  /**
   * Return the MatcherInput for UTF_8 encoding.
   */
  static MatcherInput utf8(byte[] bytes) {
    return new Utf8MatcherInput(bytes);
  }

  /**
   * Return the MatcherInput for UTF_8 encoding.
   */
  static MatcherInput utf8(String input) {
    return new Utf8MatcherInput(input.getBytes(Charset.forName("UTF-8")));
  }

  abstract Encoding getEncoding();

  abstract CharSequence asCharSequence();

  abstract byte[] asBytes();

  abstract int length();

  static class Utf8MatcherInput extends MatcherInput {
    byte[] bytes;

    public Utf8MatcherInput(byte[] bytes) {
      this.bytes = bytes;
    }

    @Override
    public Encoding getEncoding() {
      return Encoding.UTF_8;
    }

    @Override
    public CharSequence asCharSequence() {
      return new String(bytes, Charset.forName("UTF-8"));
    }

    @Override
    public byte[] asBytes() {
      return bytes;
    }