1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 package org.apache.maven.api; 20 21 import org.apache.maven.api.annotations.Experimental; 22 import org.apache.maven.api.annotations.Immutable; 23 24 import static org.apache.maven.api.ExtensibleEnums.language; 25 26 /** 27 * Language. 28 * <p> 29 * This extensible enum has two defined values, {@link #NONE} and {@link #JAVA_FAMILY}, 30 * but can be extended by registering a {@code org.apache.maven.api.spi.LanguageProvider}. 31 * <p> 32 * Implementation must have {@code equals()} and {@code hashCode()} implemented, so implementations of this interface 33 * can be used as keys. 34 * 35 * @since 4.0.0 36 */ 37 @Experimental 38 @Immutable 39 @SuppressWarnings("checkstyle:InterfaceIsType") 40 public interface Language extends ExtensibleEnum { 41 42 /** 43 * The "none" language. It is not versioned, family is same to itself, and compatible with itself only. 44 * In turn, every {@link Language} implementation must be compatible with {@code NONE} language. 45 */ 46 Language NONE = language("none"); 47 48 // TODO: this should be moved out from here to Java Support (builtin into core) 49 Language JAVA_FAMILY = language("java"); 50 }