/*
 * Copyright 2014 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.gwt.dev.util.arg;

import com.google.gwt.dev.js.JsNamespaceOption;
import com.google.gwt.util.tools.ArgHandlerEnum;

/**
 * When enabled, the GWT compiler will place most JavaScript globals into
 * namespaces instead of putting them all on the "window" object. This reduces
 * the number of globals but increases code size.
 */
public class ArgHandlerNamespace extends ArgHandlerEnum<JsNamespaceOption> {
  private final OptionNamespace options;

  public ArgHandlerNamespace(OptionNamespace options) {
    super(JsNamespaceOption.class);
    this.options = options;
  }

  @Override
  public String getPurpose() {
    return "Puts most JavaScript globals into namespaces. "
        + "Default: PACKAGE for -draftCompile, otherwise NONE";
  }

  @Override
  public boolean isExperimental() {
    return true;
  }

  @Override
  public String getTag() {
    return "-Xnamespace";
  }

  @Override
  public void setValue(JsNamespaceOption value) {
    if (options.getNamespace() != value) {
      options.setNamespace(value);
    }
  }
}