Platform.java

/*
 * Copyright (c) 2010 Google 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 com.google.api.client.escape;

/**
 * Methods factored out so that they can be emulated differently in GWT.
 */
final class Platform {
  private Platform() {
  }

  /** Returns a thread-local 1024-char array. */
  // DEST_TL.get() is not null because initialValue() below returns a non-null.
  static char[] charBufferFromThreadLocal() {
    return DEST_TL.get();
  }

  /**
   * A thread-local destination buffer to keep us from creating new buffers. The
   * starting size is 1024 characters. If we grow past this we don't put it back
   * in the threadlocal, we just keep going and grow as needed.
   */
  private static final ThreadLocal<char[]> DEST_TL = new ThreadLocal<char[]>() {
    @Override
    protected char[] initialValue() {
      return new char[1024];
    }
  };
}