home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Lucene example source code file (OpenStringBuilder.java)

This example Lucene source code file (OpenStringBuilder.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

appendable, appendable, charsequence, charsequence, openstringbuilder, openstringbuilder, string, string, unsupportedoperationexception

The Lucene OpenStringBuilder.java source code

package org.apache.lucene.analysis.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.
 */

/**
 * A StringBuilder that allows one to access the array.
 */
public class OpenStringBuilder implements Appendable, CharSequence {
  protected char[] buf;
  protected int len;

  public OpenStringBuilder() {
    this(32);
  }

  public OpenStringBuilder(int size) {
    buf = new char[size];
  }

  public OpenStringBuilder(char[] arr, int len) {
    set(arr, len);
  }

  public void setLength(int len) { this.len = len; }

  public void set(char[] arr, int end) {
    this.buf = arr;
    this.len = end;
  }

  public char[] getArray() { return buf; }
  public int size() { return len; }
  public int length() { return len; }
  public int capacity() { return buf.length; }

  public Appendable append(CharSequence csq) {
    return append(csq, 0, csq.length());
  }

  public Appendable append(CharSequence csq, int start, int end) {
    reserve(end-start);
    for (int i=start; i<end; i++) {
      unsafeWrite(csq.charAt(i));
    }
    return this;
  }

  public Appendable append(char c) {
    write(c);
    return this;
  }

  public char charAt(int index) {
    return buf[index];
  }

  public void setCharAt(int index, char ch) {
    buf[index] = ch;    
  }

  public CharSequence subSequence(int start, int end) {
    throw new UnsupportedOperationException(); // todo
  }

  public void unsafeWrite(char b) {
    buf[len++] = b;
  }

  public void unsafeWrite(int b) { unsafeWrite((char)b); }

  public void unsafeWrite(char b[], int off, int len) {
    System.arraycopy(b, off, buf, this.len, len);
    this.len += len;
  }

  protected void resize(int len) {
    char newbuf[] = new char[Math.max(buf.length << 1, len)];
    System.arraycopy(buf, 0, newbuf, 0, size());
    buf = newbuf;
  }

  public void reserve(int num) {
    if (len + num > buf.length) resize(len + num);
  }

  public void write(char b) {
    if (len >= buf.length) {
      resize(len +1);
    }
    unsafeWrite(b);
  }

  public void write(int b) { write((char)b); }

  public final void write(char[] b) {
    write(b,0,b.length);
  }

  public void write(char b[], int off, int len) {
    reserve(len);
    unsafeWrite(b, off, len);
  }

  public final void write(OpenStringBuilder arr) {
    write(arr.buf, 0, len);
  }

  public void write(String s) {
    reserve(s.length());
    s.getChars(0,s.length(),buf, len);
    len +=s.length();
  }

  public void flush() {
  }

  public final void reset() {
    len =0;
  }

  public char[] toCharArray() {
    char newbuf[] = new char[size()];
    System.arraycopy(buf, 0, newbuf, 0, size());
    return newbuf;
  }

  public String toString() {
    return new String(buf, 0, size());
  }
}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene OpenStringBuilder.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.