Java CharacterUtils.getJava4Instance方法代码示例

import org.apache.lucene.analysis.util.CharacterUtils; //导入方法依赖的package包/类
/**
 * Creates EdgeNGramTokenFilter that can generate n-grams in the sizes of the given range
 *
 * @param input {@link org.apache.lucene.analysis.TokenStream} holding the input to be tokenized
 * @param minGram the smallest n-gram to generate
 * @param maxGram the largest n-gram to generate
 */
public Lucene43EdgeNGramTokenFilter(TokenStream input, int minGram, int maxGram) {
  super(input);

  if (minGram < 1) {
    throw new IllegalArgumentException("minGram must be greater than zero");
  }

  if (minGram > maxGram) {
    throw new IllegalArgumentException("minGram must not be greater than maxGram");
  }

  this.charUtils = CharacterUtils.getJava4Instance();
  this.minGram = minGram;
  this.maxGram = maxGram;
}
 

import org.apache.lucene.analysis.util.CharacterUtils; //导入方法依赖的package包/类
private void init(Version version, int minGram, int maxGram, boolean edgesOnly) {
  if (!version.onOrAfter(Version.LUCENE_4_4_0)) {
    throw new IllegalArgumentException("This class only works with Lucene 4.4+. To emulate the old (broken) behavior of NGramTokenizer, use Lucene43NGramTokenizer/Lucene43EdgeNGramTokenizer");
  }
  charUtils = version.onOrAfter(Version.LUCENE_4_4_0)
      ? CharacterUtils.getInstance(version)
      : CharacterUtils.getJava4Instance();
  if (minGram < 1) {
    throw new IllegalArgumentException("minGram must be greater than zero");
  }
  if (minGram > maxGram) {
    throw new IllegalArgumentException("minGram must not be greater than maxGram");
  }
  this.minGram = minGram;
  this.maxGram = maxGram;
  this.edgesOnly = edgesOnly;
  charBuffer = CharacterUtils.newCharacterBuffer(2 * maxGram + 1024); // 2 * maxGram in case all code points require 2 chars and + 1024 for buffering to not keep polling the Reader
  buffer = new int[charBuffer.getBuffer().length];
  // Make the term att large enough
  termAtt.resizeBuffer(2 * maxGram);
}
 

import org.apache.lucene.analysis.util.CharacterUtils; //导入方法依赖的package包/类
private void init(Version version, int minGram, int maxGram, boolean edgesOnly) {
  if (!version.onOrAfter(Version.LUCENE_44)) {
    throw new IllegalArgumentException("This class only works with Lucene 4.4+. To emulate the old (broken) behavior of NGramTokenizer, use Lucene43NGramTokenizer/Lucene43EdgeNGramTokenizer");
  }
  charUtils = version.onOrAfter(Version.LUCENE_44)
      ? CharacterUtils.getInstance(version)
      : CharacterUtils.getJava4Instance();
  if (minGram < 1) {
    throw new IllegalArgumentException("minGram must be greater than zero");
  }
  if (minGram > maxGram) {
    throw new IllegalArgumentException("minGram must not be greater than maxGram");
  }
  this.minGram = minGram;
  this.maxGram = maxGram;
  this.edgesOnly = edgesOnly;
  charBuffer = CharacterUtils.newCharacterBuffer(2 * maxGram + 1024); // 2 * maxGram in case all code points require 2 chars and + 1024 for buffering to not keep polling the Reader
  buffer = new int[charBuffer.getBuffer().length];
  // Make the term att large enough
  termAtt.resizeBuffer(2 * maxGram);
}
 

import org.apache.lucene.analysis.util.CharacterUtils; //导入方法依赖的package包/类
/**
 * Creates Lucene43NGramTokenFilter with given min and max n-grams.
 * @param input {@link org.apache.lucene.analysis.TokenStream} holding the input to be tokenized
 * @param minGram the smallest n-gram to generate
 * @param maxGram the largest n-gram to generate
 */
public Lucene43NGramTokenFilter(TokenStream input, int minGram, int maxGram) {
  super(new CodepointCountFilter(input, minGram, Integer.MAX_VALUE));
  this.charUtils = CharacterUtils.getJava4Instance();
  if (minGram < 1) {
    throw new IllegalArgumentException("minGram must be greater than zero");
  }
  if (minGram > maxGram) {
    throw new IllegalArgumentException("minGram must not be greater than maxGram");
  }
  this.minGram = minGram;
  this.maxGram = maxGram;

  posIncAtt = new PositionIncrementAttribute() {
    @Override
    public void setPositionIncrement(int positionIncrement) {}
    @Override
    public int getPositionIncrement() {
        return 0;
      }
  };
  posLenAtt = new PositionLengthAttribute() {
    @Override
    public void setPositionLength(int positionLength) {}
    @Override
    public int getPositionLength() {
        return 0;
      }
  };
}
 

import org.apache.lucene.analysis.util.CharacterUtils; //导入方法依赖的package包/类
/**
 * @deprecated For {@link Version#LUCENE_4_3_0} or below, use {@link Lucene43EdgeNGramTokenFilter}, otherwise use {@link #EdgeNGramTokenFilter(TokenStream, int, int)}
 */
@Deprecated
public EdgeNGramTokenFilter(Version version, TokenStream input, Side side, int minGram, int maxGram) {
  super(input);

  if (version.onOrAfter(Version.LUCENE_4_4) && side == Side.BACK) {
    throw new IllegalArgumentException("Side.BACK is not supported anymore as of Lucene 4.4, use ReverseStringFilter up-front and afterward");
  }

  if (side == null) {
    throw new IllegalArgumentException("sideLabel must be either front or back");
  }

  if (minGram < 1) {
    throw new IllegalArgumentException("minGram must be greater than zero");
  }

  if (minGram > maxGram) {
    throw new IllegalArgumentException("minGram must not be greater than maxGram");
  }

  this.version = version;
  this.charUtils = version.onOrAfter(Version.LUCENE_4_4)
      ? CharacterUtils.getInstance(version)
      : CharacterUtils.getJava4Instance();
  this.minGram = minGram;
  this.maxGram = maxGram;
  this.side = side;
}
 

import org.apache.lucene.analysis.util.CharacterUtils; //导入方法依赖的package包/类
/**
 * Creates EdgeNGramTokenFilter that can generate n-grams in the sizes of the given range
 *
 * @param version the <a href="#version">Lucene match version</a>
 * @param input {@link TokenStream} holding the input to be tokenized
 * @param side the {@link Side} from which to chop off an n-gram
 * @param minGram the smallest n-gram to generate
 * @param maxGram the largest n-gram to generate
 */
@Deprecated
public EdgeNGramTokenFilter(Version version, TokenStream input, Side side, int minGram, int maxGram) {
  super(input);

  if (version == null) {
    throw new IllegalArgumentException("version must not be null");
  }

  if (version.onOrAfter(Version.LUCENE_44) && side == Side.BACK) {
    throw new IllegalArgumentException("Side.BACK is not supported anymore as of Lucene 4.4, use ReverseStringFilter up-front and afterward");
  }

  if (side == null) {
    throw new IllegalArgumentException("sideLabel must be either front or back");
  }

  if (minGram < 1) {
    throw new IllegalArgumentException("minGram must be greater than zero");
  }

  if (minGram > maxGram) {
    throw new IllegalArgumentException("minGram must not be greater than maxGram");
  }

  this.version = version;
  this.charUtils = version.onOrAfter(Version.LUCENE_44)
      ? CharacterUtils.getInstance(version)
      : CharacterUtils.getJava4Instance();
  this.minGram = minGram;
  this.maxGram = maxGram;
  this.side = side;
}