001    /*
002     * Copyright 2010-2013 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.jet.lang.types;
018    
019    import org.jetbrains.jet.lang.types.checker.JetTypeChecker;
020    
021    import java.util.Iterator;
022    import java.util.List;
023    
024    public abstract class AbstractJetType implements JetType {
025        @Override
026        public final int hashCode() {
027            int result = getConstructor().hashCode();
028            result = 31 * result + getArguments().hashCode();
029            result = 31 * result + (isNullable() ? 1 : 0);
030            return result;
031        }
032    
033        @Override
034        public final boolean equals(Object obj) {
035            if (this == obj) return true;
036            if (!(obj instanceof JetType)) return false;
037    
038            JetType type = (JetType) obj;
039    
040            return isNullable() == type.isNullable() && JetTypeChecker.INSTANCE.equalTypes(this, type);
041        }
042    
043        @Override
044        public String toString() {
045            List<TypeProjection> arguments = getArguments();
046            return getConstructor() + (arguments.isEmpty() ? "" : "<" + argumentsToString(arguments) + ">") + (isNullable() ? "?" : "");
047        }
048    
049        private static StringBuilder argumentsToString(List<TypeProjection> arguments) {
050            StringBuilder stringBuilder = new StringBuilder();
051            for (Iterator<TypeProjection> iterator = arguments.iterator(); iterator.hasNext();) {
052                TypeProjection argument = iterator.next();
053                stringBuilder.append(argument);
054                if (iterator.hasNext()) {
055                    stringBuilder.append(", ");
056                }
057            }
058            return stringBuilder;
059        }
060    }