StrMatcher.java

package org.apache.commons.lang3.text;

import java.util.Arrays;
import org.apache.commons.lang3.StringUtils;

public abstract class StrMatcher
{
  private static final StrMatcher COMMA_MATCHER = new CharMatcher(',');

  private static final StrMatcher TAB_MATCHER = new CharMatcher('\t');

  private static final StrMatcher SPACE_MATCHER = new CharMatcher(' ');

  private static final StrMatcher SPLIT_MATCHER = new CharSetMatcher(" \t\n\r\f".toCharArray());

  private static final StrMatcher TRIM_MATCHER = new TrimMatcher();

  private static final StrMatcher SINGLE_QUOTE_MATCHER = new CharMatcher('\'');

  private static final StrMatcher DOUBLE_QUOTE_MATCHER = new CharMatcher('"');

  private static final StrMatcher QUOTE_MATCHER = new CharSetMatcher("'\"".toCharArray());

  private static final StrMatcher NONE_MATCHER = new NoMatcher();

  public static StrMatcher stringMatcher(String str)
  {
    if (StringUtils.isEmpty(str)) {
      return NONE_MATCHER;
    }
    return new StringMatcher(str);
  }

  public abstract int isMatch(char[] paramArrayOfChar, int paramInt1, int paramInt2, int paramInt3);

  static final class CharMatcher extends StrMatcher
  {
    private final char ch;

    CharMatcher(char ch)
    {
      this.ch = ch;
    }

    public int isMatch(char[] buffer, int pos, int bufferStart, int bufferEnd)
    {
      return this.ch == buffer[pos] ? 1 : 0;
    }
  }

  static final class CharSetMatcher extends StrMatcher
  {
    private final char[] chars;

    CharSetMatcher(char[] chars)
    {
      this.chars = ((char[])chars.clone());
      Arrays.sort(this.chars);
    }

    public int isMatch(char[] buffer, int pos, int bufferStart, int bufferEnd)
    {
      return Arrays.binarySearch(this.chars, buffer[pos]) >= 0 ? 1 : 0;
    }
  }

  static final class NoMatcher extends StrMatcher
  {
    public int isMatch(char[] buffer, int pos, int bufferStart, int bufferEnd)
    {
      return 0;
    }
  }

  static final class StringMatcher extends StrMatcher
  {
    private final char[] chars;

    StringMatcher(String str)
    {
      this.chars = str.toCharArray();
    }

    public int isMatch(char[] buffer, int pos, int bufferStart, int bufferEnd)
    {
      int len = this.chars.length;
      if (pos + len > bufferEnd) {
        return 0;
      }
      for (int i = 0; i < this.chars.length; pos++) {
        if (this.chars[i] != buffer[pos])
          return 0;
        i++;
      }

      return len;
    }
  }

  static final class TrimMatcher extends StrMatcher
  {
    public int isMatch(char[] buffer, int pos, int bufferStart, int bufferEnd)
    {
      return buffer[pos] <= ' ' ? 1 : 0;
    }
  }
}