content: /*
   * 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.
   */
  package org.apache.calcite.avatica.util;
  
  /**
   * Efficiently writes strings of spaces.
   */
  public class Spacer {
    private int n;
  
    /** Creates a Spacer with zero spaces. */
    public Spacer() {
      this(0);
    }
  
    /** Creates a Spacer with a given number of spaces. */
    public Spacer(int n) {
      set(n);
    }
  
    /** Sets the current number of spaces. */
    public Spacer set(int n) {
      this.n = n;
      return this;
    }
  
    /** Returns the current number of spaces. */
    public int get() {
      return n;
    }
  
    /** Increases the current number of spaces by {@code n}. */
    public Spacer add(int n) {
      return set(this.n + n);
    }
  
    /** Reduces the current number of spaces by {@code n}. */
    public Spacer subtract(int n) {
      return set(this.n - n);
    }
  
    /** Returns a string of the current number of spaces. */
    public String toString() {
      return Spaces.of(n);
    }
  
    /** Appends current number of spaces to a {@link StringBuilder}. */
    public StringBuilder spaces(StringBuilder buf) {
      return Spaces.append(buf, n);
    }
  
    /** Returns a string that is padded on the right with spaces to the current
     * length. */
    public String padRight(String string) {
      Spaces.padRight(string, n);
      final int x = n - string.length();
      if (x <= 0) {
        return string;
      }
      // Replacing StringBuffer with String would hurt performance.
      //noinspection StringBufferReplaceableByString
      return Spaces.append(new StringBuilder(string), x).toString();
    }
  }
  
  // End Spacer.java
  