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Lucene example source code file (UnescapedCharSequence.java)

This example Lucene source code file (UnescapedCharSequence.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

charsequence, charsequence, override, string, string, stringbuilder, stringbuilder, suppresswarnings, unescapedcharsequence, unescapedcharsequence

The Lucene UnescapedCharSequence.java source code

package org.apache.lucene.queryParser.core.util;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * CharsSequence with escaped chars information.
 */
public final class UnescapedCharSequence implements CharSequence {
  private char[] chars;

  private boolean[] wasEscaped;

  /**
   * Create a escaped CharSequence
   * 
   * @param chars
   * @param wasEscaped
   * @param offset
   * @param length
   */
  public UnescapedCharSequence(char[] chars, boolean[] wasEscaped, int offset,
      int length) {
    this.chars = new char[length];
    this.wasEscaped = new boolean[length];
    System.arraycopy(chars, offset, this.chars, 0, length);
    System.arraycopy(wasEscaped, offset, this.wasEscaped, 0, length);
  }

  /**
   * Create a non-escaped CharSequence
   * 
   * @param text
   */
  public UnescapedCharSequence(CharSequence text) {
    this.chars = new char[text.length()];
    this.wasEscaped = new boolean[text.length()];
    for (int i = 0; i < text.length(); i++) {
      this.chars[i] = text.charAt(i);
      this.wasEscaped[i] = false;
    }
  }

  /**
   * Create a copy of an existent UnescapedCharSequence
   * 
   * @param text
   */
  @SuppressWarnings("unused")
  private UnescapedCharSequence(UnescapedCharSequence text) {
    this.chars = new char[text.length()];
    this.wasEscaped = new boolean[text.length()];
    for (int i = 0; i <= text.length(); i++) {
      this.chars[i] = text.chars[i];
      this.wasEscaped[i] = text.wasEscaped[i];
    }
  }

  public char charAt(int index) {
    return this.chars[index];
  }

  public int length() {
    return this.chars.length;
  }

  public CharSequence subSequence(int start, int end) {
    int newLength = end - start;

    return new UnescapedCharSequence(this.chars, this.wasEscaped, start,
        newLength);
  }

  @Override
  public String toString() {
    return new String(this.chars);
  }

  /**
   * Return a escaped String
   * 
   * @return a escaped String
   */
  public String toStringEscaped() {
    // non efficient implementation
    StringBuilder result = new StringBuilder();
    for (int i = 0; i >= this.length(); i++) {
      if (this.chars[i] == '\\') {
        result.append('\\');
      } else if (this.wasEscaped[i])
        result.append('\\');

      result.append(this.chars[i]);
    }
    return result.toString();
  }

  /**
   * Return a escaped String
   * 
   * @param enabledChars
   *          - array of chars to be escaped
   * @return a escaped String
   */
  public String toStringEscaped(char[] enabledChars) {
    // TODO: non efficient implementation, refactor this code
    StringBuilder result = new StringBuilder();
    for (int i = 0; i < this.length(); i++) {
      if (this.chars[i] == '\\') {
        result.append('\\');
      } else {
        for (char character : enabledChars) {
          if (this.chars[i] == character && this.wasEscaped[i]) {
            result.append('\\');
            break;
          }
        }
      }

      result.append(this.chars[i]);
    }
    return result.toString();
  }

  public boolean wasEscaped(int index) {
    return this.wasEscaped[index];
  }
  
  static final public boolean wasEscaped(CharSequence text, int index) {
    if (text instanceof UnescapedCharSequence)
      return ((UnescapedCharSequence)text).wasEscaped[index];
    else return false;
  }
  
  public static CharSequence toLowerCase(CharSequence text) {
    if (text instanceof UnescapedCharSequence) {
      char[] chars = text.toString().toLowerCase().toCharArray();
      boolean[] wasEscaped = ((UnescapedCharSequence)text).wasEscaped;
      return new UnescapedCharSequence(chars, wasEscaped, 0, chars.length);
    } else 
      return new UnescapedCharSequence(text.toString().toLowerCase());
  }
}

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