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/*
 * Copyright 2010-2013 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jetbrains.jet.lang.types;

import org.jetbrains.annotations.Nullable;

public interface TypeSubstitution {
    TypeSubstitution EMPTY = new TypeSubstitution() {
        @Override
        public TypeProjection get(TypeConstructor key) {
            return null;
        }

        @Override
        public boolean isEmpty() {
            return true;
        }

        @Override
        public String toString() {
            return "Empty TypeSubstitution";
        }
    };

    @Nullable
    TypeProjection get(TypeConstructor key);
    boolean isEmpty();
}