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;
018    
019    import com.intellij.openapi.util.text.StringUtil;
020    import com.intellij.psi.PsiClass;
021    import org.jetbrains.annotations.NotNull;
022    import org.jetbrains.jet.lang.resolve.java.kt.JetPackageClassAnnotation;
023    import org.jetbrains.jet.lang.resolve.name.FqName;
024    import org.jetbrains.jet.lang.resolve.name.Name;
025    
026    public class PackageClassUtils {
027    
028        private static final String DEFAULT_PACKAGE = "_DefaultPackage";
029    
030        // ex. <root> -> _DefaultPackage, a -> APackage, a.b -> BPackage
031        public static String getPackageClassName(@NotNull FqName packageFQN) {
032            if (packageFQN.isRoot()) {
033                return DEFAULT_PACKAGE;
034            }
035            return StringUtil.capitalize(packageFQN.shortName().asString()) + "Package";
036        }
037    
038        public static FqName getPackageClassFqName(@NotNull FqName packageFQN) {
039            return packageFQN.child(Name.identifier(getPackageClassName(packageFQN)));
040        }
041    
042        public static boolean isPackageClass(@NotNull PsiClass psiClass) {
043            return JetPackageClassAnnotation.get(psiClass).isDefined();
044        }
045    
046        public static boolean isPackageClass(@NotNull FqName fqName) {
047            if (fqName.isRoot()) {
048                return false;
049            }
050            return PackageClassUtils.getPackageClassFqName(fqName.parent()).equals(fqName);
051        }
052    }