Java tutorial
/**************************************************************** * Licensed to the Apache Software Foundation (ASF) under one * * or more contributor license agreements. See the NOTICE file * * distributed with this work for additional information * * regarding copyright ownership. The ASF licenses this file * * to you 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 org.apache.james.jmap.api.vacation; import java.util.Objects; import com.google.common.base.Preconditions; import com.google.common.base.Strings; public class AccountId { public static AccountId fromString(String identifier) { Preconditions.checkArgument(!Strings.isNullOrEmpty(identifier), "AccountId identifier should not be null or empty"); return new AccountId(identifier); } private final String identifier; private AccountId(String identifier) { this.identifier = identifier; } public String getIdentifier() { return identifier; } @Override public boolean equals(Object o) { if (o == null || getClass() != o.getClass()) { return false; } AccountId accountId = (AccountId) o; return Objects.equals(this.identifier, accountId.identifier); } @Override public int hashCode() { return Objects.hash(identifier); } }