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.resolve.scopes.receivers;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.jet.lang.types.JetType;
021    
022    public interface ReceiverValue {
023    
024        ReceiverValue NO_RECEIVER = new ReceiverValue() {
025            @NotNull
026            @Override
027            public JetType getType() {
028                throw new UnsupportedOperationException("NO_RECEIVER.getType()");
029            }
030    
031            @Override
032            public boolean exists() {
033                return false;
034            }
035    
036            @Override
037            public <R, D> R accept(@NotNull ReceiverValueVisitor<R, D> visitor, D data) {
038                return visitor.visitNoReceiver(this, data);
039            }
040    
041            @Override
042            public String toString() {
043                return "NO_RECEIVER";
044            }
045        };
046    
047        @NotNull
048        JetType getType();
049    
050        boolean exists();
051    
052        <R, D> R accept(@NotNull ReceiverValueVisitor<R, D> visitor, D data);
053    }