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/*******************************************************************************
 * Copyright (c) 2011 Michael Doberenz.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Michael Doberenz - initial API and implementation
 ******************************************************************************/
package org.fuwjin.util;

import java.util.Arrays;

/**
 * Simple class for managing indention during serialization.
 */
public class Indent {
   private static char[] spaces = arr(100);

   private static char[] arr(final int len) {
      final char[] arr = new char[len];
      Arrays.fill(arr, ' ');
      arr[0] = '\n';
      return arr;
   }

   private int width = 3;

   /**
    * Decreases the indention.
    */
   public void decrease() {
      width -= 2;
   }

   /**
    * Increases the indention.
    */
   public void increase() {
      width += 2;
   }

   @Override
   public String toString() {
      if(width > spaces.length) {
         spaces = arr(spaces.length * 2);
      }
      return new String(spaces, 0, width);
   }
}