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.codegen;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.kotlin.descriptors.ClassifierDescriptor;
021    import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor;
022    import org.jetbrains.kotlin.load.java.descriptors.JavaClassDescriptor;
023    import org.jetbrains.kotlin.load.java.sam.SingleAbstractMethodUtils;
024    import org.jetbrains.kotlin.types.JetType;
025    
026    public class SamType {
027        public static SamType create(@NotNull JetType originalType) {
028            if (!SingleAbstractMethodUtils.isSamType(originalType)) return null;
029            return new SamType(originalType);
030        }
031    
032        private final JetType type;
033    
034        private SamType(@NotNull JetType type) {
035            this.type = type;
036        }
037    
038        @NotNull
039        public JetType getType() {
040            return type;
041        }
042    
043        @NotNull
044        public JavaClassDescriptor getJavaClassDescriptor() {
045            ClassifierDescriptor classifier = type.getConstructor().getDeclarationDescriptor();
046            assert classifier instanceof JavaClassDescriptor : "Sam interface not a Java class: " + classifier;
047            return (JavaClassDescriptor) classifier;
048        }
049    
050        @NotNull
051        public JetType getKotlinFunctionType() {
052            //noinspection ConstantConditions
053            return getJavaClassDescriptor().getFunctionTypeForSamInterface();
054        }
055    
056        @NotNull
057        public SimpleFunctionDescriptor getAbstractMethod() {
058            return (SimpleFunctionDescriptor) SingleAbstractMethodUtils.getAbstractMembers(type).get(0);
059        }
060    
061        @Override
062        public boolean equals(Object o) {
063            return o instanceof SamType && type.equals(((SamType) o).type);
064        }
065    
066        @Override
067        public int hashCode() {
068            return type.hashCode();
069        }
070    
071        @Override
072        public String toString() {
073            return "SamType(" + type + ")";
074        }
075    }