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 org.jetbrains.annotations.NotNull;
020    import org.jetbrains.jet.lang.resolve.name.FqName;
021    import org.jetbrains.jet.lang.resolve.name.Name;
022    
023    public final class PackageClassUtils {
024        public static final String PACKAGE_CLASS_NAME_SUFFIX = "Package";
025        private static final String DEFAULT_PACKAGE_CLASS_NAME = "_Default" + PACKAGE_CLASS_NAME_SUFFIX;
026    
027        private PackageClassUtils() {
028        }
029    
030        // ex. <root> -> _DefaultPackage, a -> APackage, a.b -> BPackage
031        @NotNull
032        public static String getPackageClassName(@NotNull FqName packageFQN) {
033            if (packageFQN.isRoot()) {
034                return DEFAULT_PACKAGE_CLASS_NAME;
035            }
036            return capitalizeNonEmptyString(packageFQN.shortName().asString()) + PACKAGE_CLASS_NAME_SUFFIX;
037        }
038    
039        @NotNull
040        private static String capitalizeNonEmptyString(@NotNull String s) {
041            return Character.isUpperCase(s.charAt(0)) ? s : Character.toUpperCase(s.charAt(0)) + s.substring(1);
042        }
043    
044        @NotNull
045        public static FqName getPackageClassFqName(@NotNull FqName packageFQN) {
046            return packageFQN.child(Name.identifier(getPackageClassName(packageFQN)));
047        }
048    
049        public static boolean isPackageClassFqName(@NotNull FqName fqName) {
050            return !fqName.isRoot() && getPackageClassFqName(fqName.parent()).equals(fqName);
051        }
052    }