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.kt;
018    
019    import com.intellij.openapi.util.text.StringUtil;
020    import com.intellij.psi.PsiAnnotation;
021    import com.intellij.psi.PsiModifierListOwner;
022    import org.jetbrains.annotations.NotNull;
023    import org.jetbrains.annotations.Nullable;
024    import org.jetbrains.jet.lang.resolve.java.JvmStdlibNames;
025    import org.jetbrains.jet.lang.resolve.java.resolver.JavaAnnotationResolver;
026    
027    public class KotlinSignatureAnnotation extends PsiAnnotationWrapper {
028        private static final KotlinSignatureAnnotation NULL_ANNOTATION = new KotlinSignatureAnnotation(null);
029        static {
030            NULL_ANNOTATION.checkInitialized();
031        }
032    
033        private String signature;
034    
035        private KotlinSignatureAnnotation(@Nullable PsiAnnotation psiAnnotation) {
036            super(psiAnnotation);
037        }
038    
039        @Override
040        protected void initialize() {
041            signature = StringUtil.unescapeStringCharacters(getStringAttribute(JvmStdlibNames.KOTLIN_SIGNATURE_VALUE_METHOD, ""));
042        }
043    
044        @NotNull
045        public String signature() {
046            checkInitialized();
047            return signature;
048        }
049    
050        @NotNull
051        public static KotlinSignatureAnnotation get(PsiModifierListOwner psiModifierListOwner) {
052            PsiAnnotation annotation =
053                    JavaAnnotationResolver.findAnnotationWithExternal(psiModifierListOwner, JvmStdlibNames.KOTLIN_SIGNATURE.getFqName().asString());
054            return annotation != null ? new KotlinSignatureAnnotation(annotation) : NULL_ANNOTATION;
055        }
056    }