Java example source code file (CreateSymbols.java)

This example Java source code file (CreateSymbols.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, attribute, charsequence, classsymbol, file, hashset, ioexception, javactaskimpl, must, pool, runtimeexception, set, string, throwable, util

The CreateSymbols.java Java example source code

/*
 * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.tools.javac.sym;

import com.sun.tools.javac.api.JavacTaskImpl;
import com.sun.tools.javac.code.Kinds;
import com.sun.tools.javac.code.Scope;
import com.sun.tools.javac.code.Symbol.*;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Attribute;
import com.sun.tools.javac.code.Symtab;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.code.Types;
import com.sun.tools.javac.jvm.ClassWriter;
import com.sun.tools.javac.jvm.Pool;
import com.sun.tools.javac.processing.JavacProcessingEnvironment;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.Names;
import com.sun.tools.javac.util.Pair;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.Set;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedOptions;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileManager.Location;
import javax.tools.JavaFileObject;
import static javax.tools.JavaFileObject.Kind.CLASS;
import javax.tools.StandardJavaFileManager;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;

/**
 * Used to generate a "symbol file" representing rt.jar that only
 * includes supported or legacy proprietary API.  Valid annotation
 * processor options:
 *
 * <dl>
 * <dt>com.sun.tools.javac.sym.Jar
 * <dd>Specifies the location of rt.jar.
 * <dt>com.sun.tools.javac.sym.Dest
 * <dd>Specifies the destination directory.
 * </dl>
 *
 * <p>This is NOT part of any supported API.
 * If you write code that depends on this, you do so at your own
 * risk.  This code and its internal interfaces are subject to change
 * or deletion without notice.</b>

 *
 * @author Peter von der Ah\u00e9
 */
@SupportedOptions({
    "com.sun.tools.javac.sym.Jar",
    "com.sun.tools.javac.sym.Dest",
    "com.sun.tools.javac.sym.Profiles"})
@SupportedAnnotationTypes("*")
public class CreateSymbols extends AbstractProcessor {

    static Set<String> getLegacyPackages() {
        ResourceBundle legacyBundle
            = ResourceBundle.getBundle("com.sun.tools.javac.resources.legacy");
        Set<String> keys = new HashSet();
        for (Enumeration<String> e = legacyBundle.getKeys(); e.hasMoreElements(); )
            keys.add(e.nextElement());
        return keys;
    }

    public boolean process(Set<? extends TypeElement> tes, RoundEnvironment renv) {
        try {
            if (renv.processingOver())
                createSymbols();
        } catch (IOException e) {
            CharSequence msg = e.getLocalizedMessage();
            if (msg == null)
                msg = e.toString();
            processingEnv.getMessager()
                .printMessage(Diagnostic.Kind.ERROR, msg);
        } catch (Throwable t) {
            t.printStackTrace();
            Throwable cause = t.getCause();
            if (cause == null)
                cause = t;
            CharSequence msg = cause.getLocalizedMessage();
            if (msg == null)
                msg = cause.toString();
            processingEnv.getMessager()
                .printMessage(Diagnostic.Kind.ERROR, msg);
        }
        return true;
    }

    void createSymbols() throws IOException {
        Set<String> legacy = getLegacyPackages();
        Set<String> legacyProprietary = getLegacyPackages();
        Set<String> documented = new HashSet();
        Set<PackageSymbol> packages =
            ((JavacProcessingEnvironment)processingEnv).getSpecifiedPackages();
        Map<String,String> pOptions = processingEnv.getOptions();
        String jarName = pOptions.get("com.sun.tools.javac.sym.Jar");
        if (jarName == null)
            throw new RuntimeException("Must use -Acom.sun.tools.javac.sym.Jar=LOCATION_OF_JAR");
        String destName = pOptions.get("com.sun.tools.javac.sym.Dest");
        if (destName == null)
            throw new RuntimeException("Must use -Acom.sun.tools.javac.sym.Dest=LOCATION_OF_JAR");
        String profileSpec=pOptions.get("com.sun.tools.javac.sym.Profiles");
        if (profileSpec == null)
            throw new RuntimeException("Must use -Acom.sun.tools.javac.sym.Profiles=PROFILES_SPEC");
        Profiles profiles = Profiles.read(new File(profileSpec));

        for (PackageSymbol psym : packages) {
            String name = psym.getQualifiedName().toString();
            legacyProprietary.remove(name);
            documented.add(name);
        }

        JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
        StandardJavaFileManager fm = tool.getStandardFileManager(null, null, null);
        Location jarLocation = StandardLocation.locationFor(jarName);
        File jarFile = new File(jarName);
        fm.setLocation(jarLocation, List.of(jarFile));
        fm.setLocation(StandardLocation.CLASS_PATH, List.<File>nil());
        fm.setLocation(StandardLocation.SOURCE_PATH, List.<File>nil());
        {
            ArrayList<File> bootClassPath = new ArrayList();
            bootClassPath.add(jarFile);
            for (File path : fm.getLocation(StandardLocation.PLATFORM_CLASS_PATH)) {
                if (!new File(path.getName()).equals(new File("rt.jar")))
                    bootClassPath.add(path);
            }
            System.err.println("Using boot class path = " + bootClassPath);
            fm.setLocation(StandardLocation.PLATFORM_CLASS_PATH, bootClassPath);
        }
        // System.out.println(fm.getLocation(StandardLocation.PLATFORM_CLASS_PATH));
        File destDir = new File(destName);
        if (!destDir.exists())
            if (!destDir.mkdirs())
                throw new RuntimeException("Could not create " + destDir);
        fm.setLocation(StandardLocation.CLASS_OUTPUT, List.of(destDir));
        Set<String> hiddenPackages = new HashSet();
        Set<String> crisp = new HashSet();
        List<String> options = List.of("-XDdev");
        // options = options.prepend("-doe");
        // options = options.prepend("-verbose");
        JavacTaskImpl task = (JavacTaskImpl)
            tool.getTask(null, fm, null, options, null, null);
        com.sun.tools.javac.main.JavaCompiler compiler =
            com.sun.tools.javac.main.JavaCompiler.instance(task.getContext());
        ClassWriter writer = ClassWriter.instance(task.getContext());
        Symtab syms = Symtab.instance(task.getContext());
        Names names = Names.instance(task.getContext());
        Attribute.Compound proprietaryAnno =
            new Attribute.Compound(syms.proprietaryType,
                                   List.<Pairnil());
        Attribute.Compound[] profileAnnos = new Attribute.Compound[profiles.getProfileCount() + 1];
        Symbol.MethodSymbol profileValue = (MethodSymbol) syms.profileType.tsym.members().lookup(names.value).sym;
        for (int i = 1; i < profileAnnos.length; i++) {
            profileAnnos[i] = new Attribute.Compound(syms.profileType,
                    List.<Pairof(
                    new Pair<Symbol.MethodSymbol, Attribute>(profileValue, new Attribute.Constant(syms.intType, i))));
        }

        Type.moreInfo = true;
        Types types = Types.instance(task.getContext());
        Pool pool = new Pool(types);
        for (JavaFileObject file : fm.list(jarLocation, "", EnumSet.of(CLASS), true)) {
            String className = fm.inferBinaryName(jarLocation, file);
            int index = className.lastIndexOf('.');
            String pckName = index == -1 ? "" : className.substring(0, index);
            boolean addLegacyAnnotation = false;
            if (documented.contains(pckName)) {
                if (!legacy.contains(pckName))
                    crisp.add(pckName);
                // System.out.println("Documented: " + className);
            } else if (legacyProprietary.contains(pckName)) {
                addLegacyAnnotation = true;
                // System.out.println("Legacy proprietary: " + className);
            } else {
                // System.out.println("Hidden " + className);
                hiddenPackages.add(pckName);
                continue;
            }
            TypeSymbol sym = (TypeSymbol)compiler.resolveIdent(className);
            if (sym.kind != Kinds.TYP) {
                if (className.indexOf('$') < 0) {
                    System.err.println("Ignoring (other) " + className + " : " + sym);
                    System.err.println("   " + sym.getClass().getSimpleName() + " " + sym.type);
                }
                continue;
            }
            sym.complete();
            if (sym.getEnclosingElement().getKind() != ElementKind.PACKAGE) {
                System.err.println("Ignoring (bad) " + sym.getQualifiedName());
                continue;
            }
            ClassSymbol cs = (ClassSymbol) sym;
            if (addLegacyAnnotation) {
                cs.prependAttributes(List.of(proprietaryAnno));
            }
            int p = profiles.getProfile(cs.fullname.toString().replace(".", "/"));
            if (0 < p && p < profileAnnos.length)
                cs.prependAttributes(List.of(profileAnnos[p]));
            writeClass(pool, cs, writer);
        }

        if (false) {
            for (String pckName : crisp)
                System.out.println("Crisp: " + pckName);
            for (String pckName : hiddenPackages)
                System.out.println("Hidden: " + pckName);
            for (String pckName : legacyProprietary)
                System.out.println("Legacy proprietary: " + pckName);
            for (String pckName : documented)
                System.out.println("Documented: " + pckName);
        }
    }

    void writeClass(final Pool pool, final ClassSymbol cs, final ClassWriter writer)
        throws IOException
    {
        try {
            pool.reset();
            cs.pool = pool;
            writer.writeClass(cs);
            for (Scope.Entry e = cs.members().elems; e != null; e = e.sibling) {
                if (e.sym.kind == Kinds.TYP) {
                    ClassSymbol nestedClass = (ClassSymbol)e.sym;
                    nestedClass.complete();
                    writeClass(pool, nestedClass, writer);
                }
            }
        } catch (ClassWriter.StringOverflow ex) {
            throw new RuntimeException(ex);
        } catch (ClassWriter.PoolOverflow ex) {
            throw new RuntimeException(ex);
        }
    }

    public SourceVersion getSupportedSourceVersion() {
        return SourceVersion.latest();
    }

    // used for debugging
    public static void main(String... args) {
        String rt_jar = args[0];
        String dest = args[1];
        args = new String[] {
            "-Xbootclasspath:" + rt_jar,
            "-XDprocess.packages",
            "-proc:only",
            "-processor",
            "com.sun.tools.javac.sym.CreateSymbols",
            "-Acom.sun.tools.javac.sym.Jar=" + rt_jar,
            "-Acom.sun.tools.javac.sym.Dest=" + dest,
            // <editor-fold defaultstate="collapsed">
            "java.applet",
            "java.awt",
            "java.awt.color",
            "java.awt.datatransfer",
            "java.awt.dnd",
            "java.awt.event",
            "java.awt.font",
            "java.awt.geom",
            "java.awt.im",
            "java.awt.im.spi",
            "java.awt.image",
            "java.awt.image.renderable",
            "java.awt.print",
            "java.beans",
            "java.beans.beancontext",
            "java.io",
            "java.lang",
            "java.lang.annotation",
            "java.lang.instrument",
            "java.lang.management",
            "java.lang.ref",
            "java.lang.reflect",
            "java.math",
            "java.net",
            "java.nio",
            "java.nio.channels",
            "java.nio.channels.spi",
            "java.nio.charset",
            "java.nio.charset.spi",
            "java.rmi",
            "java.rmi.activation",
            "java.rmi.dgc",
            "java.rmi.registry",
            "java.rmi.server",
            "java.security",
            "java.security.acl",
            "java.security.cert",
            "java.security.interfaces",
            "java.security.spec",
            "java.sql",
            "java.text",
            "java.text.spi",
            "java.util",
            "java.util.concurrent",
            "java.util.concurrent.atomic",
            "java.util.concurrent.locks",
            "java.util.jar",
            "java.util.logging",
            "java.util.prefs",
            "java.util.regex",
            "java.util.spi",
            "java.util.zip",
            "javax.accessibility",
            "javax.activation",
            "javax.activity",
            "javax.annotation",
            "javax.annotation.processing",
            "javax.crypto",
            "javax.crypto.interfaces",
            "javax.crypto.spec",
            "javax.imageio",
            "javax.imageio.event",
            "javax.imageio.metadata",
            "javax.imageio.plugins.jpeg",
            "javax.imageio.plugins.bmp",
            "javax.imageio.spi",
            "javax.imageio.stream",
            "javax.jws",
            "javax.jws.soap",
            "javax.lang.model",
            "javax.lang.model.element",
            "javax.lang.model.type",
            "javax.lang.model.util",
            "javax.management",
            "javax.management.loading",
            "javax.management.monitor",
            "javax.management.relation",
            "javax.management.openmbean",
            "javax.management.timer",
            "javax.management.modelmbean",
            "javax.management.remote",
            "javax.management.remote.rmi",
            "javax.naming",
            "javax.naming.directory",
            "javax.naming.event",
            "javax.naming.ldap",
            "javax.naming.spi",
            "javax.net",
            "javax.net.ssl",
            "javax.print",
            "javax.print.attribute",
            "javax.print.attribute.standard",
            "javax.print.event",
            "javax.rmi",
            "javax.rmi.CORBA",
            "javax.rmi.ssl",
            "javax.script",
            "javax.security.auth",
            "javax.security.auth.callback",
            "javax.security.auth.kerberos",
            "javax.security.auth.login",
            "javax.security.auth.spi",
            "javax.security.auth.x500",
            "javax.security.cert",
            "javax.security.sasl",
            "javax.sound.sampled",
            "javax.sound.sampled.spi",
            "javax.sound.midi",
            "javax.sound.midi.spi",
            "javax.sql",
            "javax.sql.rowset",
            "javax.sql.rowset.serial",
            "javax.sql.rowset.spi",
            "javax.swing",
            "javax.swing.border",
            "javax.swing.colorchooser",
            "javax.swing.filechooser",
            "javax.swing.event",
            "javax.swing.table",
            "javax.swing.text",
            "javax.swing.text.html",
            "javax.swing.text.html.parser",
            "javax.swing.text.rtf",
            "javax.swing.tree",
            "javax.swing.undo",
            "javax.swing.plaf",
            "javax.swing.plaf.basic",
            "javax.swing.plaf.metal",
            "javax.swing.plaf.multi",
            "javax.swing.plaf.synth",
            "javax.tools",
            "javax.transaction",
            "javax.transaction.xa",
            "javax.xml.parsers",
            "javax.xml.bind",
            "javax.xml.bind.annotation",
            "javax.xml.bind.annotation.adapters",
            "javax.xml.bind.attachment",
            "javax.xml.bind.helpers",
            "javax.xml.bind.util",
            "javax.xml.soap",
            "javax.xml.ws",
            "javax.xml.ws.handler",
            "javax.xml.ws.handler.soap",
            "javax.xml.ws.http",
            "javax.xml.ws.soap",
            "javax.xml.ws.spi",
            "javax.xml.transform",
            "javax.xml.transform.sax",
            "javax.xml.transform.dom",
            "javax.xml.transform.stax",
            "javax.xml.transform.stream",
            "javax.xml",
            "javax.xml.crypto",
            "javax.xml.crypto.dom",
            "javax.xml.crypto.dsig",
            "javax.xml.crypto.dsig.dom",
            "javax.xml.crypto.dsig.keyinfo",
            "javax.xml.crypto.dsig.spec",
            "javax.xml.datatype",
            "javax.xml.validation",
            "javax.xml.namespace",
            "javax.xml.xpath",
            "javax.xml.stream",
            "javax.xml.stream.events",
            "javax.xml.stream.util",
            "org.ietf.jgss",
            "org.omg.CORBA",
            "org.omg.CORBA.DynAnyPackage",
            "org.omg.CORBA.ORBPackage",
            "org.omg.CORBA.TypeCodePackage",
            "org.omg.stub.java.rmi",
            "org.omg.CORBA.portable",
            "org.omg.CORBA_2_3",
            "org.omg.CORBA_2_3.portable",
            "org.omg.CosNaming",
            "org.omg.CosNaming.NamingContextExtPackage",
            "org.omg.CosNaming.NamingContextPackage",
            "org.omg.SendingContext",
            "org.omg.PortableServer",
            "org.omg.PortableServer.CurrentPackage",
            "org.omg.PortableServer.POAPackage",
            "org.omg.PortableServer.POAManagerPackage",
            "org.omg.PortableServer.ServantLocatorPackage",
            "org.omg.PortableServer.portable",
            "org.omg.PortableInterceptor",
            "org.omg.PortableInterceptor.ORBInitInfoPackage",
            "org.omg.Messaging",
            "org.omg.IOP",
            "org.omg.IOP.CodecFactoryPackage",
            "org.omg.IOP.CodecPackage",
            "org.omg.Dynamic",
            "org.omg.DynamicAny",
            "org.omg.DynamicAny.DynAnyPackage",
            "org.omg.DynamicAny.DynAnyFactoryPackage",
            "org.w3c.dom",
            "org.w3c.dom.events",
            "org.w3c.dom.bootstrap",
            "org.w3c.dom.ls",
            "org.xml.sax",
            "org.xml.sax.ext",
            "org.xml.sax.helpers",
            "com.sun.java.browser.dom",
            "org.w3c.dom",
            "org.w3c.dom.bootstrap",
            "org.w3c.dom.ls",
            "org.w3c.dom.ranges",
            "org.w3c.dom.traversal",
            "org.w3c.dom.html",
            "org.w3c.dom.stylesheets",
            "org.w3c.dom.css",
            "org.w3c.dom.events",
            "org.w3c.dom.views",
            "com.sun.management",
            "com.sun.security.auth",
            "com.sun.security.auth.callback",
            "com.sun.security.auth.login",
            "com.sun.security.auth.module",
            "com.sun.security.jgss",
            "com.sun.net.httpserver",
            "com.sun.net.httpserver.spi",
            "javax.smartcardio"
            // </editor-fold>
        };
        com.sun.tools.javac.Main.compile(args);
    }

}