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
017package org.jetbrains.jet.lang.resolve.java.kt;
018
019import com.intellij.psi.PsiAnnotation;
020import com.intellij.psi.PsiAnnotationMemberValue;
021import com.intellij.psi.PsiLiteralExpression;
022import org.jetbrains.annotations.NotNull;
023import org.jetbrains.annotations.Nullable;
024
025public class PsiAnnotationUtils {
026
027    private PsiAnnotationUtils() {
028    }
029
030    @NotNull
031    public static String getStringAttribute(@Nullable PsiAnnotation annotation, @NotNull String field, @NotNull String defaultValue) {
032        return getAttribute(annotation, field, defaultValue);
033    }
034
035    public static boolean getBooleanAttribute(@Nullable PsiAnnotation annotation, @NotNull String field, boolean defaultValue) {
036        return getAttribute(annotation, field, defaultValue);
037    }
038
039    public static int getIntAttribute(@Nullable PsiAnnotation annotation, @NotNull String field, int defaultValue) {
040        return getAttribute(annotation, field, defaultValue);
041    }
042
043    @NotNull
044    private static <T> T getAttribute(@Nullable PsiAnnotation annotation, @NotNull String field, @NotNull T defaultValue) {
045        if (annotation == null) {
046            return defaultValue;
047        }
048        else {
049            PsiAnnotationMemberValue value = annotation.findAttributeValue(field);
050            if (value instanceof PsiLiteralExpression) {
051                PsiLiteralExpression attributeValue = (PsiLiteralExpression) value;
052                return (T) attributeValue.getValue();
053            }
054            else {
055                return defaultValue;
056            }
057        }
058    }
059
060}