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.codegen;
018    
019    import kotlin.Function0;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.jet.storage.LockBasedStorageManager;
022    import org.jetbrains.jet.storage.NotNullLazyValue;
023    
024    public class ClassBuilderOnDemand extends DelegatingClassBuilder {
025        private final NotNullLazyValue<ClassBuilder> classBuilder;
026    
027        public ClassBuilderOnDemand(@NotNull Function0<ClassBuilder> createClassBuilder) {
028            this.classBuilder = LockBasedStorageManager.NO_LOCKS.createLazyValue(createClassBuilder);
029        }
030    
031        @Override
032        @NotNull
033        protected ClassBuilder getDelegate() {
034            return classBuilder.invoke();
035        }
036    
037        @Override
038        public void done() {
039            if (classBuilder.isComputed()) {
040                classBuilder.invoke().done();
041            }
042        }
043    }