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;
018
019import com.intellij.openapi.util.text.StringUtil;
020import com.intellij.psi.PsiClass;
021import org.jetbrains.annotations.NotNull;
022import org.jetbrains.jet.lang.resolve.java.kt.JetPackageClassAnnotation;
023import org.jetbrains.jet.lang.resolve.name.FqName;
024import org.jetbrains.jet.lang.resolve.name.Name;
025
026public 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}