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.util.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.
  @SuppressWarnings("nullness")
  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];
    }
  };
}