001    /*
002     * Copyright 2010-2015 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.kotlin.name;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    
022    import java.util.List;
023    
024    public abstract class FqNameBase {
025    
026        protected FqNameBase() {
027            if (!(this instanceof FqName || this instanceof FqNameUnsafe)) {
028                throw new AssertionError("do not use this class directly");
029            }
030        }
031    
032        @NotNull
033        protected abstract String asString();
034    
035        @NotNull
036        private FqNameUnsafe toFqNameUnsafe() {
037            if (this instanceof FqName) {
038                return ((FqName) this).toUnsafe();
039            }
040            else if (this instanceof FqNameUnsafe) {
041                return ((FqNameUnsafe) this);
042            }
043            else {
044                throw new AssertionError();
045            }
046        }
047    
048        public final boolean equalsTo(@Nullable FqName that) {
049            return that != null && equalsTo(that.toUnsafe());
050        }
051    
052        public final boolean equalsTo(@Nullable FqNameUnsafe that) {
053            return toFqNameUnsafe().equals(that);
054        }
055    
056        @NotNull
057        public abstract Name shortNameOrSpecial();
058    
059        @NotNull
060        public abstract List<Name> pathSegments();
061    }