001    /*
002     * Copyright 2010-2014 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.java.structure.impl;
018    
019    import com.intellij.psi.PsiExpression;
020    import com.intellij.psi.impl.JavaConstantExpressionEvaluator;
021    import com.intellij.psi.util.PsiUtil;
022    import org.jetbrains.annotations.NotNull;
023    import org.jetbrains.annotations.Nullable;
024    import org.jetbrains.jet.lang.descriptors.PropertyDescriptor;
025    import org.jetbrains.jet.lang.evaluate.ConstantExpressionEvaluator;
026    import org.jetbrains.jet.lang.resolve.constants.CompileTimeConstant;
027    import org.jetbrains.jet.lang.resolve.constants.ConstantsPackage;
028    import org.jetbrains.jet.lang.resolve.java.structure.JavaField;
029    import org.jetbrains.jet.lang.resolve.java.structure.JavaPropertyInitializerEvaluator;
030    
031    public class JavaPropertyInitializerEvaluatorImpl implements JavaPropertyInitializerEvaluator {
032        @Nullable
033        @Override
034        public CompileTimeConstant<?> getInitializerConstant(@NotNull JavaField field, @NotNull PropertyDescriptor descriptor) {
035            PsiExpression initializer = ((JavaFieldImpl) field).getInitializer();
036            Object evaluatedExpression = JavaConstantExpressionEvaluator.computeConstantExpression(initializer, false);
037            if (evaluatedExpression != null) {
038                return ConstantsPackage.createCompileTimeConstant(
039                        evaluatedExpression,
040                        ConstantExpressionEvaluator.OBJECT$.isPropertyCompileTimeConstant(descriptor),
041                        false,
042                        true,
043                        descriptor.getType());
044            }
045            return null;
046        }
047    
048        @Override
049        public boolean isNotNullCompileTimeConstant(@NotNull JavaField field) {
050            // PsiUtil.isCompileTimeConstant returns false for null-initialized fields,
051            // see com.intellij.psi.util.IsConstantExpressionVisitor.visitLiteralExpression()
052            return PsiUtil.isCompileTimeConstant(((JavaFieldImpl) field).getPsi());
053        }
054    }