lubomir@1029: /**
lubomir@1029:  * Back 2 Browser Bytecode Translator
lubomir@1029:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
lubomir@1029:  *
lubomir@1029:  * This program is free software: you can redistribute it and/or modify
lubomir@1029:  * it under the terms of the GNU General Public License as published by
lubomir@1029:  * the Free Software Foundation, version 2 of the License.
lubomir@1029:  *
lubomir@1029:  * This program is distributed in the hope that it will be useful,
lubomir@1029:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
lubomir@1029:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
lubomir@1029:  * GNU General Public License for more details.
lubomir@1029:  *
lubomir@1029:  * You should have received a copy of the GNU General Public License
lubomir@1029:  * along with this program. Look for COPYING file in the top folder.
lubomir@1029:  * If not, see http://opensource.org/licenses/GPL-2.0.
lubomir@1029:  */
lubomir@1029: package org.apidesign.vm4brwsr;
lubomir@1029: 
lubomir@1029: import java.io.IOException;
lubomir@1029: import java.io.InputStream;
lubomir@1029: import java.util.HashMap;
lubomir@1029: import java.util.Map;
lubomir@1029: import org.apidesign.bck2brwsr.core.ExtraJavaScript;
lubomir@1029: import org.apidesign.vm4brwsr.ByteCodeParser.AnnotationParser;
lubomir@1029: import org.apidesign.vm4brwsr.ByteCodeParser.ClassData;
lubomir@1029: import org.apidesign.vm4brwsr.ByteCodeParser.FieldData;
lubomir@1029: import org.apidesign.vm4brwsr.ByteCodeParser.MethodData;
lubomir@1029: 
lubomir@1029: @ExtraJavaScript(processByteCode = false, resource="")
lubomir@1029: final class ExportedSymbols {
lubomir@1029:     private final Bck2Brwsr.Resources resources;
jaroslav@1491:     private final StringArray exported;
lubomir@1029:     private final Map<Object, Boolean> isMarkedAsExportedCache;
lubomir@1029: 
jaroslav@1491:     ExportedSymbols(final Bck2Brwsr.Resources resources, StringArray explicitlyExported) {
lubomir@1029:         this.resources = resources;
jaroslav@1491:         this.exported = explicitlyExported;
lubomir@1029: 
lubomir@1029:         isMarkedAsExportedCache = new HashMap<Object, Boolean>();
lubomir@1029:     }
lubomir@1029: 
lubomir@1029:     boolean isExported(ClassData classData) throws IOException {
jaroslav@1491:         if (exported.contains(classData.getClassName())) {
jaroslav@1491:             return true;
jaroslav@1491:         }
lubomir@1029:         return classData.isPublic() && isMarkedAsExportedPackage(
lubomir@1029:                                            classData.getPkgName())
lubomir@1029:                    || isMarkedAsExported(classData);
lubomir@1029:     }
lubomir@1029: 
lubomir@1029:     boolean isExported(MethodData methodData) throws IOException {
lubomir@1029:         return isAccessible(methodData.access) && isExported(methodData.cls)
lubomir@1029:                    || isMarkedAsExported(methodData);
lubomir@1029:     }
lubomir@1029: 
lubomir@1029:     boolean isExported(FieldData fieldData) throws IOException {
jaroslav@1561:         if (
jaroslav@1561:             isAccessible(fieldData.access) && 
jaroslav@1561:             isExported(fieldData.cls) || isMarkedAsExported(fieldData)
jaroslav@1561:         ) {
jaroslav@1561:             return true;
jaroslav@1561:         }
jaroslav@1561:         if (
jaroslav@1561:             fieldData.isStatic() && fieldData.getName().equals("$VALUES") &&
jaroslav@1561:             "java/lang/Enum".equals(fieldData.cls.getSuperClassName())
jaroslav@1561:         ) {
jaroslav@1561:             // enum values need to be exported
jaroslav@1561:             return true;
jaroslav@1561:         }
jaroslav@1561:         return false;
lubomir@1029:     }
lubomir@1029: 
lubomir@1029:     private boolean isMarkedAsExportedPackage(String pkgName) {
lubomir@1029:         if (pkgName == null) {
lubomir@1029:             return false;
lubomir@1029:         }
jaroslav@1592:         if (pkgName.startsWith("java/")) {
jaroslav@1592:             return true;
jaroslav@1592:         }
lubomir@1029: 
lubomir@1029:         final Boolean cachedValue = isMarkedAsExportedCache.get(pkgName);
lubomir@1029:         if (cachedValue != null) {
lubomir@1029:             return cachedValue;
lubomir@1029:         }
lubomir@1029: 
lubomir@1029:         final boolean newValue = resolveIsMarkedAsExportedPackage(pkgName);
lubomir@1029:         isMarkedAsExportedCache.put(pkgName, newValue);
lubomir@1029: 
lubomir@1029:         return newValue;
lubomir@1029:     }
lubomir@1029: 
lubomir@1029:     private boolean isMarkedAsExported(ClassData classData)
lubomir@1029:             throws IOException {
lubomir@1029:         final Boolean cachedValue = isMarkedAsExportedCache.get(classData);
lubomir@1029:         if (cachedValue != null) {
lubomir@1029:             return cachedValue;
lubomir@1029:         }
lubomir@1029: 
lubomir@1029:         final boolean newValue =
lubomir@1029:                 isMarkedAsExported(classData.findAnnotationData(true),
lubomir@1029:                                    classData);
lubomir@1029:         isMarkedAsExportedCache.put(classData, newValue);
lubomir@1029: 
lubomir@1029:         return newValue;
lubomir@1029:     }
lubomir@1029: 
lubomir@1029:     private boolean isMarkedAsExported(MethodData methodData)
lubomir@1029:             throws IOException {
lubomir@1029:         return isMarkedAsExported(methodData.findAnnotationData(true),
lubomir@1029:                                   methodData.cls);
lubomir@1029:     }
lubomir@1029: 
lubomir@1029:     private boolean isMarkedAsExported(FieldData fieldData)
lubomir@1029:             throws IOException {
lubomir@1029:         return isMarkedAsExported(fieldData.findAnnotationData(true),
lubomir@1029:                                   fieldData.cls);
lubomir@1029:     }
lubomir@1029: 
lubomir@1029:     private boolean resolveIsMarkedAsExportedPackage(String pkgName) {
jaroslav@1583:         if (exported.contains(pkgName + '/')) {
jaroslav@1583:             return true;
jaroslav@1583:         }
lubomir@1029:         try {
lubomir@1029:             final InputStream is =
lubomir@1029:                     resources.get(pkgName + "/package-info.class");
lubomir@1029:             if (is == null) {
lubomir@1029:                 return false;
lubomir@1029:             }
lubomir@1029: 
lubomir@1029:             try {
lubomir@1029:                 final ClassData pkgInfoClass = new ClassData(is);
lubomir@1029:                 return isMarkedAsExported(
lubomir@1029:                                pkgInfoClass.findAnnotationData(true),
lubomir@1029:                                pkgInfoClass);
lubomir@1029:             } finally {
lubomir@1029:                 is.close();
lubomir@1029:             }
lubomir@1029:         } catch (final IOException e) {
lubomir@1029:             return false;
lubomir@1029:         }
lubomir@1029:     }
lubomir@1029: 
jaroslav@1586:     static boolean isMarkedAsExported(byte[] arrData, ClassData cd)
lubomir@1029:             throws IOException {
lubomir@1029:         if (arrData == null) {
lubomir@1029:             return false;
lubomir@1029:         }
lubomir@1029: 
lubomir@1029:         final boolean[] found = { false };
lubomir@1029:         final AnnotationParser annotationParser =
lubomir@1029:                 new AnnotationParser(false, false) {
lubomir@1029:                     @Override
lubomir@1029:                     protected void visitAnnotationStart(
lubomir@1029:                             String type,
lubomir@1029:                             boolean top) {
lubomir@1029:                         if (top && type.equals("Lorg/apidesign/bck2brwsr"
lubomir@1029:                                                    + "/core/Exported;")) {
lubomir@1029:                             found[0] = true;
lubomir@1029:                         }
lubomir@1029:                     }
lubomir@1029:                 };
lubomir@1029:         annotationParser.parse(arrData, cd);
lubomir@1029:         return found[0];
lubomir@1029:     }
lubomir@1029: 
lubomir@1029:     private static boolean isAccessible(int access) {
lubomir@1029:         return (access & (ByteCodeParser.ACC_PUBLIC
lubomir@1029:                               | ByteCodeParser.ACC_PROTECTED)) != 0;
lubomir@1029:     }
lubomir@1029: }