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.java.kotlinSignature;
018    
019    import com.intellij.openapi.util.text.StringUtil;
020    import jet.runtime.typeinfo.KotlinSignature;
021    import org.jetbrains.annotations.NotNull;
022    import org.jetbrains.annotations.Nullable;
023    import org.jetbrains.jet.lang.resolve.java.resolver.JavaAnnotationResolver;
024    import org.jetbrains.jet.lang.resolve.java.structure.JavaAnnotation;
025    import org.jetbrains.jet.lang.resolve.java.structure.JavaAnnotationArgument;
026    import org.jetbrains.jet.lang.resolve.java.structure.JavaLiteralAnnotationArgument;
027    import org.jetbrains.jet.lang.resolve.java.structure.JavaMember;
028    import org.jetbrains.jet.lang.resolve.name.FqName;
029    import org.jetbrains.jet.lang.resolve.name.Name;
030    
031    import static org.jetbrains.jet.lang.resolve.java.resolver.DescriptorResolverUtils.fqNameByClass;
032    
033    public class SignaturesUtil {
034        public static final FqName KOTLIN_SIGNATURE = fqNameByClass(KotlinSignature.class);
035        public static final Name KOTLIN_SIGNATURE_VALUE_FIELD_NAME = Name.identifier("value");
036    
037        private SignaturesUtil() {
038        }
039    
040        @Nullable
041        public static String getKotlinSignature(@NotNull JavaAnnotationResolver annotationResolver, @NotNull JavaMember member) {
042            JavaAnnotation annotation = annotationResolver.findAnnotationWithExternal(member, KOTLIN_SIGNATURE);
043    
044            if (annotation != null) {
045                JavaAnnotationArgument argument = annotation.findArgument(KOTLIN_SIGNATURE_VALUE_FIELD_NAME);
046                if (argument instanceof JavaLiteralAnnotationArgument) {
047                    Object value = ((JavaLiteralAnnotationArgument) argument).getValue();
048                    if (value instanceof String) {
049                        return StringUtil.unescapeStringCharacters((String) value);
050                    }
051                }
052            }
053    
054            return null;
055        }
056    }