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/*
 * Copyright (c) 2008-2014 MongoDB, Inc.
 *
 * Licensed 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.bson.json;

public class JsonBuffer {

  private final String buffer;
  private int position;

  public JsonBuffer(final String buffer) {
    this.buffer = buffer;
  }

  public int getPosition() {
    return position;
  }

  public void setPosition(final int position) {
    this.position = position;
  }

  public int read() {
    return (position >= buffer.length()) ? -1 : buffer.charAt(position++);
  }

  public void unread(final int c) {
    if (c != -1 && buffer.charAt(position - 1) == c) {
      position--;
    }
  }

  public String substring(final int beginIndex) {
    return buffer.substring(beginIndex);
  }

  public String substring(final int beginIndex, final int endIndex) {
    return buffer.substring(beginIndex, endIndex);
  }
}