com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/scoping/DescriptorProvider.java

/*
 * Created on May 30, 2011
 *
 * 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.
 *
 * Copyright @2011 the original author or authors.
 */
package com.google.eclipse.protobuf.scoping;

import org.eclipse.xtext.parser.IParser;

import com.google.inject.*;

/**
 * Provider of a singleton instance of <code>{@link Descriptor}</code>.
 *
 * @author Alex Ruiz
 */
@Singleton
public class DescriptorProvider implements Provider<Descriptor> {

  @Inject private IParser parser;

  private Descriptor descriptor;

  public synchronized Descriptor get() {
    if (descriptor == null) descriptor = new Descriptor(parser);
    return descriptor;
  }
}