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/**
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lubomir@1029
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* Back 2 Browser Bytecode Translator
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jaroslav@1787
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* Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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lubomir@1029
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.vm4brwsr;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.HashMap;
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import java.util.Map;
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import org.apidesign.bck2brwsr.core.ExtraJavaScript;
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import org.apidesign.vm4brwsr.ByteCodeParser.AnnotationParser;
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import org.apidesign.vm4brwsr.ByteCodeParser.ClassData;
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import org.apidesign.vm4brwsr.ByteCodeParser.FieldData;
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import org.apidesign.vm4brwsr.ByteCodeParser.MethodData;
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@ExtraJavaScript(processByteCode = false, resource="")
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final class ExportedSymbols {
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private final Bck2Brwsr.Resources resources;
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private final StringArray exported;
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private final Map<Object, Boolean> isMarkedAsExportedCache;
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ExportedSymbols(final Bck2Brwsr.Resources resources, StringArray explicitlyExported) {
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this.resources = resources;
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this.exported = explicitlyExported;
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isMarkedAsExportedCache = new HashMap<Object, Boolean>();
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}
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boolean isExported(ClassData classData) throws IOException {
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if (exported.contains(classData.getClassName())) {
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return true;
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}
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return classData.isPublic() && isMarkedAsExportedPackage(
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classData.getPkgName())
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|| isMarkedAsExported(classData);
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}
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boolean isExported(MethodData methodData) throws IOException {
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return isAccessible(methodData.access) && isExported(methodData.cls)
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|| isMarkedAsExported(methodData);
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}
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boolean isExported(FieldData fieldData) throws IOException {
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if (
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isAccessible(fieldData.access) &&
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isExported(fieldData.cls) || isMarkedAsExported(fieldData)
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) {
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return true;
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}
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if (
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fieldData.isStatic() && fieldData.getName().equals("$VALUES") &&
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"java/lang/Enum".equals(fieldData.cls.getSuperClassName())
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) {
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// enum values need to be exported
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return true;
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}
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return false;
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}
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private boolean isMarkedAsExportedPackage(String pkgName) {
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if (pkgName == null) {
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return false;
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}
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if (pkgName.startsWith("java/")) {
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return true;
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}
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final Boolean cachedValue = isMarkedAsExportedCache.get(pkgName);
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if (cachedValue != null) {
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return cachedValue;
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}
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final boolean newValue = resolveIsMarkedAsExportedPackage(pkgName);
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isMarkedAsExportedCache.put(pkgName, newValue);
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return newValue;
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}
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private boolean isMarkedAsExported(ClassData classData)
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throws IOException {
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final Boolean cachedValue = isMarkedAsExportedCache.get(classData);
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if (cachedValue != null) {
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return cachedValue;
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}
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final boolean newValue =
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isMarkedAsExported(classData.findAnnotationData(true),
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classData);
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isMarkedAsExportedCache.put(classData, newValue);
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return newValue;
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}
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private boolean isMarkedAsExported(MethodData methodData)
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throws IOException {
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return isMarkedAsExported(methodData.findAnnotationData(true),
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methodData.cls);
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}
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private boolean isMarkedAsExported(FieldData fieldData)
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throws IOException {
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return isMarkedAsExported(fieldData.findAnnotationData(true),
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fieldData.cls);
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}
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private boolean resolveIsMarkedAsExportedPackage(String pkgName) {
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if (exported.contains(pkgName + '/')) {
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return true;
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}
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try {
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final InputStream is =
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resources.get(pkgName + "/package-info.class");
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if (is == null) {
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return false;
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}
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try {
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final ClassData pkgInfoClass = new ClassData(is);
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return isMarkedAsExported(
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pkgInfoClass.findAnnotationData(true),
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pkgInfoClass);
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} finally {
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is.close();
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}
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} catch (final IOException e) {
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return false;
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}
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}
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static boolean isMarkedAsExported(byte[] arrData, ClassData cd)
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throws IOException {
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if (arrData == null) {
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return false;
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}
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final boolean[] found = { false };
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final AnnotationParser annotationParser =
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new AnnotationParser(false, false) {
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@Override
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protected void visitAnnotationStart(
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String type,
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boolean top) {
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if (top && type.equals("Lorg/apidesign/bck2brwsr"
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+ "/core/Exported;")) {
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found[0] = true;
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}
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}
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};
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annotationParser.parse(arrData, cd);
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return found[0];
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}
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private static boolean isAccessible(int access) {
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return (access & (ByteCodeParser.ACC_PUBLIC
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| ByteCodeParser.ACC_PROTECTED)) != 0;
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}
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}
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