Java example source code file (Main.java)
The Main.java Java example source code/*
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* 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.
*
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package sun.rmi.rmic.newrmic;
import com.sun.javadoc.ClassDoc;
import com.sun.javadoc.RootDoc;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import sun.rmi.rmic.newrmic.jrmp.JrmpGenerator;
import sun.tools.util.CommandLine;
/**
* The rmic front end. This class contains the "main" method for rmic
* command line invocation.
*
* A Main instance contains the stream to output error messages and
* other diagnostics to.
*
* An rmic compilation batch (for example, one rmic command line
* invocation) is executed by invoking the "compile" method of a Main
* instance.
*
* WARNING: The contents of this source file are not part of any
* supported API. Code that depends on them does so at its own risk:
* they are subject to change or removal without notice.
*
* NOTE: If and when there is a J2SE API for invoking SDK tools, this
* class should be updated to support that API.
*
* NOTE: This class is the front end for a "new" rmic implementation,
* which uses javadoc and the doclet API for reading class files and
* javac for compiling generated source files. This implementation is
* incomplete: it lacks any CORBA-based back end implementations, and
* thus the command line options "-idl", "-iiop", and their related
* options are not yet supported. The front end for the "old",
* oldjavac-based rmic implementation is sun.rmi.rmic.Main.
*
* @author Peter Jones
**/
public class Main {
/*
* Implementation note:
*
* In order to use the doclet API to read class files, much of
* this implementation of rmic executes as a doclet within an
* invocation of javadoc. This class is used as the doclet class
* for such javadoc invocations, via its static "start" and
* "optionLength" methods. There is one javadoc invocation per
* rmic compilation batch.
*
* The only guaranteed way to pass data to a doclet through a
* javadoc invocation is through doclet-specific options on the
* javadoc "command line". Rather than passing numerous pieces of
* individual data in string form as javadoc options, we use a
* single doclet-specific option ("-batchID") to pass a numeric
* identifier that uniquely identifies the rmic compilation batch
* that the javadoc invocation is for, and that identifier can
* then be used as a key in a global table to retrieve an object
* containing all of batch-specific data (rmic command line
* arguments, etc.).
*/
/** guards "batchCount" */
private static final Object batchCountLock = new Object();
/** number of batches run; used to generated batch IDs */
private static long batchCount = 0;
/** maps batch ID to batch data */
private static final Map<Long,Batch> batchTable =
Collections.synchronizedMap(new HashMap<Long,Batch>());
/** stream to output error messages and other diagnostics to */
private final PrintStream out;
/** name of this program, to use in error messages */
private final String program;
/**
* Command line entry point.
**/
public static void main(String[] args) {
Main rmic = new Main(System.err, "rmic");
System.exit(rmic.compile(args) ? 0 : 1);
}
/**
* Creates a Main instance that writes output to the specified
* stream. The specified program name is used in error messages.
**/
public Main(OutputStream out, String program) {
this.out = out instanceof PrintStream ?
(PrintStream) out : new PrintStream(out);
this.program = program;
}
/**
* Compiles a batch of input classes, as given by the specified
* command line arguments. Protocol-specific generators are
* determined by the choice options on the command line. Returns
* true if successful, or false if an error occurred.
*
* NOTE: This method is retained for transitional consistency with
* previous implementations.
**/
public boolean compile(String[] args) {
long startTime = System.currentTimeMillis();
long batchID;
synchronized (batchCountLock) {
batchID = batchCount++; // assign batch ID
}
// process command line
Batch batch = parseArgs(args);
if (batch == null) {
return false; // terminate if error occurred
}
/*
* With the batch data retrievable in the global table, run
* javadoc to continue the rest of the batch's compliation as
* a doclet.
*/
boolean status;
try {
batchTable.put(batchID, batch);
status = invokeJavadoc(batch, batchID);
} finally {
batchTable.remove(batchID);
}
if (batch.verbose) {
long deltaTime = System.currentTimeMillis() - startTime;
output(Resources.getText("rmic.done_in",
Long.toString(deltaTime)));
}
return status;
}
/**
* Prints the specified string to the output stream of this Main
* instance.
**/
public void output(String msg) {
out.println(msg);
}
/**
* Prints an error message to the output stream of this Main
* instance. The first argument is used as a key in rmic's
* resource bundle, and the rest of the arguments are used as
* arguments in the formatting of the resource string.
**/
public void error(String msg, String... args) {
output(Resources.getText(msg, args));
}
/**
* Prints rmic's usage message to the output stream of this Main
* instance.
*
* This method is public so that it can be used by the "parseArgs"
* methods of Generator implementations.
**/
public void usage() {
error("rmic.usage", program);
}
/**
* Processes rmic command line arguments. Returns a Batch object
* representing the command line arguments if successful, or null
* if an error occurred. Processed elements of the args array are
* set to null.
**/
private Batch parseArgs(String[] args) {
Batch batch = new Batch();
/*
* Pre-process command line for @file arguments.
*/
try {
args = CommandLine.parse(args);
} catch (FileNotFoundException e) {
error("rmic.cant.read", e.getMessage());
return null;
} catch (IOException e) {
e.printStackTrace(out);
return null;
}
for (int i = 0; i < args.length; i++) {
if (args[i] == null) {
// already processed by a generator
continue;
} else if (args[i].equals("-Xnew")) {
// we're already using the "new" implementation
args[i] = null;
} else if (args[i].equals("-show")) {
// obselete: fail
error("rmic.option.unsupported", args[i]);
usage();
return null;
} else if (args[i].equals("-O")) {
// obselete: warn but tolerate
error("rmic.option.unsupported", args[i]);
args[i] = null;
} else if (args[i].equals("-debug")) {
// obselete: warn but tolerate
error("rmic.option.unsupported", args[i]);
args[i] = null;
} else if (args[i].equals("-depend")) {
// obselete: warn but tolerate
// REMIND: should this fail instead?
error("rmic.option.unsupported", args[i]);
args[i] = null;
} else if (args[i].equals("-keep") ||
args[i].equals("-keepgenerated"))
{
batch.keepGenerated = true;
args[i] = null;
} else if (args[i].equals("-g")) {
batch.debug = true;
args[i] = null;
} else if (args[i].equals("-nowarn")) {
batch.noWarn = true;
args[i] = null;
} else if (args[i].equals("-nowrite")) {
batch.noWrite = true;
args[i] = null;
} else if (args[i].equals("-verbose")) {
batch.verbose = true;
args[i] = null;
} else if (args[i].equals("-Xnocompile")) {
batch.noCompile = true;
batch.keepGenerated = true;
args[i] = null;
} else if (args[i].equals("-bootclasspath")) {
if ((i + 1) >= args.length) {
error("rmic.option.requires.argument", args[i]);
usage();
return null;
}
if (batch.bootClassPath != null) {
error("rmic.option.already.seen", args[i]);
usage();
return null;
}
args[i] = null;
batch.bootClassPath = args[++i];
assert batch.bootClassPath != null;
args[i] = null;
} else if (args[i].equals("-extdirs")) {
if ((i + 1) >= args.length) {
error("rmic.option.requires.argument", args[i]);
usage();
return null;
}
if (batch.extDirs != null) {
error("rmic.option.already.seen", args[i]);
usage();
return null;
}
args[i] = null;
batch.extDirs = args[++i];
assert batch.extDirs != null;
args[i] = null;
} else if (args[i].equals("-classpath")) {
if ((i + 1) >= args.length) {
error("rmic.option.requires.argument", args[i]);
usage();
return null;
}
if (batch.classPath != null) {
error("rmic.option.already.seen", args[i]);
usage();
return null;
}
args[i] = null;
batch.classPath = args[++i];
assert batch.classPath != null;
args[i] = null;
} else if (args[i].equals("-d")) {
if ((i + 1) >= args.length) {
error("rmic.option.requires.argument", args[i]);
usage();
return null;
}
if (batch.destDir != null) {
error("rmic.option.already.seen", args[i]);
usage();
return null;
}
args[i] = null;
batch.destDir = new File(args[++i]);
assert batch.destDir != null;
args[i] = null;
if (!batch.destDir.exists()) {
error("rmic.no.such.directory", batch.destDir.getPath());
usage();
return null;
}
} else if (args[i].equals("-v1.1") ||
args[i].equals("-vcompat") ||
args[i].equals("-v1.2"))
{
Generator gen = new JrmpGenerator();
batch.generators.add(gen);
// JrmpGenerator only requires base BatchEnvironment class
if (!gen.parseArgs(args, this)) {
return null;
}
} else if (args[i].equalsIgnoreCase("-iiop")) {
error("rmic.option.unimplemented", args[i]);
return null;
// Generator gen = new IiopGenerator();
// batch.generators.add(gen);
// if (!batch.envClass.isAssignableFrom(gen.envClass())) {
// error("rmic.cannot.use.both",
// batch.envClass.getName(), gen.envClass().getName());
// return null;
// }
// batch.envClass = gen.envClass();
// if (!gen.parseArgs(args, this)) {
// return null;
// }
} else if (args[i].equalsIgnoreCase("-idl")) {
error("rmic.option.unimplemented", args[i]);
return null;
// see implementation sketch above
} else if (args[i].equalsIgnoreCase("-xprint")) {
error("rmic.option.unimplemented", args[i]);
return null;
// see implementation sketch above
}
}
/*
* At this point, all that remains non-null in the args
* array are input class names or illegal options.
*/
for (int i = 0; i < args.length; i++) {
if (args[i] != null) {
if (args[i].startsWith("-")) {
error("rmic.no.such.option", args[i]);
usage();
return null;
} else {
batch.classes.add(args[i]);
}
}
}
if (batch.classes.isEmpty()) {
usage();
return null;
}
/*
* If options did not specify at least one protocol-specific
* generator, then JRMP is the default.
*/
if (batch.generators.isEmpty()) {
batch.generators.add(new JrmpGenerator());
}
return batch;
}
/**
* Doclet class entry point.
**/
public static boolean start(RootDoc rootDoc) {
/*
* Find batch ID among javadoc options, and retrieve
* corresponding batch data from global table.
*/
long batchID = -1;
for (String[] option : rootDoc.options()) {
if (option[0].equals("-batchID")) {
try {
batchID = Long.parseLong(option[1]);
} catch (NumberFormatException e) {
throw new AssertionError(e);
}
}
}
Batch batch = batchTable.get(batchID);
assert batch != null;
/*
* Construct batch environment using class agreed upon by
* generator implementations.
*/
BatchEnvironment env;
try {
Constructor<? extends BatchEnvironment> cons =
batch.envClass.getConstructor(new Class<?>[] { RootDoc.class });
env = cons.newInstance(rootDoc);
} catch (NoSuchMethodException e) {
throw new AssertionError(e);
} catch (IllegalAccessException e) {
throw new AssertionError(e);
} catch (InstantiationException e) {
throw new AssertionError(e);
} catch (InvocationTargetException e) {
throw new AssertionError(e);
}
env.setVerbose(batch.verbose);
/*
* Determine the destination directory (the top of the package
* hierarchy) for the output of this batch; if no destination
* directory was specified on the command line, then the
* default is the current working directory.
*/
File destDir = batch.destDir;
if (destDir == null) {
destDir = new File(System.getProperty("user.dir"));
}
/*
* Run each input class through each generator.
*/
for (String inputClassName : batch.classes) {
ClassDoc inputClass = rootDoc.classNamed(inputClassName);
try {
for (Generator gen : batch.generators) {
gen.generate(env, inputClass, destDir);
}
} catch (NullPointerException e) {
/*
* We assume that this means that some class that was
* needed (perhaps even a bootstrap class) was not
* found, and that javadoc has already reported this
* as an error. There is nothing for us to do here
* but try to continue with the next input class.
*
* REMIND: More explicit error checking throughout
* would be preferable, however.
*/
}
}
/*
* Compile any generated source files, if configured to do so.
*/
boolean status = true;
List<File> generatedFiles = env.generatedFiles();
if (!batch.noCompile && !batch.noWrite && !generatedFiles.isEmpty()) {
status = batch.enclosingMain().invokeJavac(batch, generatedFiles);
}
/*
* Delete any generated source files, if configured to do so.
*/
if (!batch.keepGenerated) {
for (File file : generatedFiles) {
file.delete();
}
}
return status;
}
/**
* Doclet class method that indicates that this doclet class
* recognizes (only) the "-batchID" option on the javadoc command
* line, and that the "-batchID" option comprises two arguments on
* the javadoc command line.
**/
public static int optionLength(String option) {
if (option.equals("-batchID")) {
return 2;
} else {
return 0;
}
}
/**
* Runs the javadoc tool to invoke this class as a doclet, passing
* command line options derived from the specified batch data and
* indicating the specified batch ID.
*
* NOTE: This method currently uses a J2SE-internal API to run
* javadoc. If and when there is a J2SE API for invoking SDK
* tools, this method should be updated to use that API instead.
**/
private boolean invokeJavadoc(Batch batch, long batchID) {
List<String> javadocArgs = new ArrayList
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