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