platform/vcs-log/impl/src/com/intellij/vcs/log/data/VcsUserRegistry.java

/*
 * Copyright 2000-2013 JetBrains s.r.o.
 *
 * 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.intellij.vcs.log.data;

import com.intellij.util.containers.ContainerUtil;
import com.intellij.util.containers.Interner;
import com.intellij.vcs.log.VcsUser;
import com.intellij.vcs.log.impl.VcsUserImpl;
import org.jetbrains.annotations.NotNull;

import java.util.Set;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 *
 */
public class VcsUserRegistry {

  private final Interner<VcsUser> myUserMap = new Interner<VcsUser>();
  private final ReadWriteLock myLock = new ReentrantReadWriteLock();

  @NotNull
  public VcsUser createUser(@NotNull String name, @NotNull String email) {
    return addUser(new VcsUserImpl(name, email));
  }

  @NotNull
  public VcsUser addUser(@NotNull VcsUser user) {
    myLock.writeLock().lock();
    try {
      return myUserMap.intern(user);
    }
    finally {
      myLock.writeLock().unlock();
    }

  }

  @NotNull
  public Set<VcsUser> getUsers() {
    myLock.readLock().lock();
    try {
      return ContainerUtil.newHashSet(myUserMap.getValues());
    }
    finally {
      myLock.readLock().unlock();
    }
  }
}