src/jdk.compiler/share/classes/com/sun/tools/sjavac/comp/SmartFileManager.java - toolchain/jdk/jdk9_langtools - Git at Google

 /*
  * Copyright (c) 2012, 2016, 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.sjavac.comp;

 import java.io.IOException;
 import java.io.PrintWriter;
 import java.net.URI;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;

 import javax.tools.*;
 import javax.tools.JavaFileObject.Kind;

 import com.sun.tools.javac.file.JavacFileManager;
 import com.sun.tools.javac.util.DefinedBy;
 import com.sun.tools.javac.util.DefinedBy.Api;
 import com.sun.tools.javac.util.ListBuffer;

 /**
  * Intercepts reads and writes to the file system to gather
  * information about what artifacts are generated.
  *
  * Traps writes to certain files, if the content written is identical
  * to the existing file.
  *
  * Can also blind out the filemanager from seeing certain files in the file system.
  * Necessary to prevent javac from seeing some sources where the source path points.
  *
  *  <p><b>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>
  */
 @com.sun.tools.javac.api.ClientCodeWrapper.Trusted
 public class SmartFileManager extends ForwardingJavaFileManager<JavaFileManager> {

     // Set of sources that can be seen by javac.
     Set<URI> visibleSources = new HashSet<>();
     // Map from modulename:packagename to artifacts.
     Map<String,Set<URI>> packageArtifacts = new HashMap<>();

     public SmartFileManager(JavaFileManager fileManager) {
         super(fileManager);
     }

     public void setVisibleSources(Set<URI> s) {
         visibleSources = s;
     }

     public void cleanArtifacts() {
         packageArtifacts = new HashMap<>();
     }

     /**
      * Set whether or not to use ct.sym as an alternate to rt.jar.
      */
     public void setSymbolFileEnabled(boolean b) {
         if (!(fileManager instanceof JavacFileManager))
             throw new IllegalStateException();
         ((JavacFileManager) fileManager).setSymbolFileEnabled(b);
     }

     @DefinedBy(Api.COMPILER)
     public String inferBinaryName(Location location, JavaFileObject file) {
         return super.inferBinaryName(location, locUnwrap(file));
     }


     public Map<String,Set<URI>> getPackageArtifacts() {
         return packageArtifacts;
     }

     @Override @DefinedBy(Api.COMPILER)
     public Iterable<JavaFileObject> list(Location location,
                                          String packageName,
                                          Set<Kind> kinds,
                                          boolean recurse) throws IOException {
         // TODO: Do this lazily by returning an iterable with a filtering Iterator
         // Acquire the list of files.
         Iterable<JavaFileObject> files = super.list(location, packageName, kinds, recurse);
         if (visibleSources.isEmpty()) {
             return locWrapMany(files, location);
         }
         // Now filter!
         ListBuffer<JavaFileObject> filteredFiles = new ListBuffer<>();
         for (JavaFileObject f : files) {
             URI uri = f.toUri();
             String t = uri.toString();
             if (t.startsWith("jar:")
                 || t.endsWith(".class")
                 || visibleSources.contains(uri)) {
                 filteredFiles.add(f);
             }
         }

         return locWrapMany(filteredFiles, location);
     }

     @Override @DefinedBy(Api.COMPILER)
     public JavaFileObject getJavaFileForInput(Location location,
                                               String className,
                                               Kind kind) throws IOException {
         JavaFileObject file = super.getJavaFileForInput(location, className, kind);
         file = locWrap(file, location);
         if (file == null || visibleSources.isEmpty()) {
             return file;
         }

         if (visibleSources.contains(file.toUri()) || isModuleInfo(file)) {
             return file;
         }
         return null;
     }

     @Override @DefinedBy(Api.COMPILER)
     public JavaFileObject getJavaFileForOutput(Location location,
                                                String className,
                                                Kind kind,
                                                FileObject sibling) throws IOException {
         JavaFileObject file = super.getJavaFileForOutput(location, className, kind, sibling);
         file = locWrap(file, location);
         if (file == null) return file;
         int dp = className.lastIndexOf('.');
         String pkg_name = "";
         if (dp != -1) {
             pkg_name = className.substring(0, dp);
         }
         // When modules are in use, then the mod_name might be something like "jdk_base"
         String mod_name = "";
         addArtifact(mod_name+":"+pkg_name, file.toUri());
         return file;
     }

     @Override @DefinedBy(Api.COMPILER)
     public FileObject getFileForInput(Location location,
                                       String packageName,
                                       String relativeName) throws IOException {
         FileObject file =  super.getFileForInput(location, packageName, relativeName);
         file = locWrap(file, location);
         if (file == null || visibleSources.isEmpty()) {
             return file;
         }

         if (visibleSources.contains(file.toUri()) || isModuleInfo(file)) {
             return file;
         }
         return null;
     }

     private boolean isModuleInfo(FileObject fo) {
         if (fo instanceof JavaFileObject) {
             JavaFileObject jfo = (JavaFileObject) fo;
             return jfo.isNameCompatible("module-info", Kind.SOURCE)
                 || jfo.isNameCompatible("module-info", Kind.CLASS);
         }
         return false;
     }

     @Override @DefinedBy(Api.COMPILER)
     public FileObject getFileForOutput(Location location,
                                        String packageName,
                                        String relativeName,
                                        FileObject sibling) throws IOException {
         FileObject superFile = super.getFileForOutput(location, packageName, relativeName, sibling);
         FileObject file = locWrap(superFile, location);
         if (file == null) return file;

         if (location.equals(StandardLocation.NATIVE_HEADER_OUTPUT) && superFile instanceof JavaFileObject) {
            file = new SmartFileObject((JavaFileObject) file);
            packageName = ":" + packageNameFromFileName(relativeName);
         }
         if (packageName.equals("")) {
             packageName = ":";
         }
         addArtifact(packageName, file.toUri());
         return file;
     }

     @Override
     public Location getModuleLocation(Location location, JavaFileObject fo, String pkgName) throws IOException {
         return super.getModuleLocation(location, locUnwrap(fo), pkgName);
     }

     private static String packageNameFromFileName(String fn) {
         StringBuilder sb = new StringBuilder();
         int p = fn.indexOf('_'), pp = 0;
         while (p != -1) {
             if (sb.length() > 0) sb.append('.');
             sb.append(fn.substring(pp,p));
             if (p == fn.length()-1) break;
             pp = p+1;
             p = fn.indexOf('_',pp);
         }
         return sb.toString();
     }

     void addArtifact(String pkgName, URI art) {
         Set<URI> s = packageArtifacts.get(pkgName);
         if (s == null) {
             s = new HashSet<>();
             packageArtifacts.put(pkgName, s);
         }
         s.add(art);
     }

     public static JavaFileObject locWrap(JavaFileObject jfo, Location loc) {

         // From sjavac's perspective platform classes are not interesting and
         // there is no need to track the location for these file objects.
         // Also, there exists some jfo instanceof checks which breaks if
         // the jfos for platform classes are wrapped.
         if (loc == StandardLocation.PLATFORM_CLASS_PATH)
             return jfo;

         return jfo == null ? null : new JavaFileObjectWithLocation<>(jfo, loc);
     }

     private static FileObject locWrap(FileObject fo, Location loc) {
         if (fo instanceof JavaFileObject)
             return locWrap((JavaFileObject) fo, loc);
         return fo == null ? null : new FileObjectWithLocation<>(fo, loc);
     }

     @DefinedBy(Api.COMPILER)
     @Override
     public boolean isSameFile(FileObject a, FileObject b) {
         return super.isSameFile(locUnwrap(a), locUnwrap(b));
     }

     private static ListBuffer<JavaFileObject> locWrapMany(Iterable<JavaFileObject> jfos,
                                                           Location loc) {
         ListBuffer<JavaFileObject> locWrapped = new ListBuffer<>();
         for (JavaFileObject f : jfos)
             locWrapped.add(locWrap(f, loc));
         return locWrapped;
     }

     private static FileObject locUnwrap(FileObject fo) {
         if (fo instanceof FileObjectWithLocation<?>)
             return ((FileObjectWithLocation<?>) fo).getDelegate();
         if (fo instanceof JavaFileObjectWithLocation<?>)
             return ((JavaFileObjectWithLocation<?>) fo).getDelegate();
         return fo;
     }

     private static JavaFileObject locUnwrap(JavaFileObject fo) {
         if (fo instanceof JavaFileObjectWithLocation<?>)
             return ((JavaFileObjectWithLocation<?>) fo).getDelegate();
         return fo;
     }
 }
	/*
	* Copyright (c) 2012, 2016, 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.sjavac.comp;

	import java.io.IOException;
	import java.io.PrintWriter;
	import java.net.URI;
	import java.nio.file.Path;
	import java.nio.file.Paths;
	import java.util.HashMap;
	import java.util.HashSet;
	import java.util.Map;
	import java.util.Set;

	import javax.tools.*;
	import javax.tools.JavaFileObject.Kind;

	import com.sun.tools.javac.file.JavacFileManager;
	import com.sun.tools.javac.util.DefinedBy;
	import com.sun.tools.javac.util.DefinedBy.Api;
	import com.sun.tools.javac.util.ListBuffer;

	/**
	* Intercepts reads and writes to the file system to gather
	* information about what artifacts are generated.
	*
	* Traps writes to certain files, if the content written is identical
	* to the existing file.
	*
	* Can also blind out the filemanager from seeing certain files in the file system.
	* Necessary to prevent javac from seeing some sources where the source path points.
	*
	* <p><b>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>
	*/
	@com.sun.tools.javac.api.ClientCodeWrapper.Trusted
	public class SmartFileManager extends ForwardingJavaFileManager<JavaFileManager> {

	// Set of sources that can be seen by javac.
	Set<URI> visibleSources = new HashSet<>();
	// Map from modulename:packagename to artifacts.
	Map<String,Set<URI>> packageArtifacts = new HashMap<>();

	public SmartFileManager(JavaFileManager fileManager) {
	super(fileManager);
	}

	public void setVisibleSources(Set<URI> s) {
	visibleSources = s;
	}

	public void cleanArtifacts() {
	packageArtifacts = new HashMap<>();
	}

	/**
	* Set whether or not to use ct.sym as an alternate to rt.jar.
	*/
	public void setSymbolFileEnabled(boolean b) {
	if (!(fileManager instanceof JavacFileManager))
	throw new IllegalStateException();
	((JavacFileManager) fileManager).setSymbolFileEnabled(b);
	}

	@DefinedBy(Api.COMPILER)
	public String inferBinaryName(Location location, JavaFileObject file) {
	return super.inferBinaryName(location, locUnwrap(file));
	}


	public Map<String,Set<URI>> getPackageArtifacts() {
	return packageArtifacts;
	}

	@Override @DefinedBy(Api.COMPILER)
	public Iterable<JavaFileObject> list(Location location,
	String packageName,
	Set<Kind> kinds,
	boolean recurse) throws IOException {
	// TODO: Do this lazily by returning an iterable with a filtering Iterator
	// Acquire the list of files.
	Iterable<JavaFileObject> files = super.list(location, packageName, kinds, recurse);
	if (visibleSources.isEmpty()) {
	return locWrapMany(files, location);
	}
	// Now filter!
	ListBuffer<JavaFileObject> filteredFiles = new ListBuffer<>();
	for (JavaFileObject f : files) {
	URI uri = f.toUri();
	String t = uri.toString();
	if (t.startsWith("jar:")
	\|\| t.endsWith(".class")
	\|\| visibleSources.contains(uri)) {
	filteredFiles.add(f);
	}
	}

	return locWrapMany(filteredFiles, location);
	}

	@Override @DefinedBy(Api.COMPILER)
	public JavaFileObject getJavaFileForInput(Location location,
	String className,
	Kind kind) throws IOException {
	JavaFileObject file = super.getJavaFileForInput(location, className, kind);
	file = locWrap(file, location);
	if (file == null \|\| visibleSources.isEmpty()) {
	return file;
	}

	if (visibleSources.contains(file.toUri()) \|\| isModuleInfo(file)) {
	return file;
	}
	return null;
	}

	@Override @DefinedBy(Api.COMPILER)
	public JavaFileObject getJavaFileForOutput(Location location,
	String className,
	Kind kind,
	FileObject sibling) throws IOException {
	JavaFileObject file = super.getJavaFileForOutput(location, className, kind, sibling);
	file = locWrap(file, location);
	if (file == null) return file;
	int dp = className.lastIndexOf('.');
	String pkg_name = "";
	if (dp != -1) {
	pkg_name = className.substring(0, dp);
	}
	// When modules are in use, then the mod_name might be something like "jdk_base"
	String mod_name = "";
	addArtifact(mod_name+":"+pkg_name, file.toUri());
	return file;
	}

	@Override @DefinedBy(Api.COMPILER)
	public FileObject getFileForInput(Location location,
	String packageName,
	String relativeName) throws IOException {
	FileObject file = super.getFileForInput(location, packageName, relativeName);
	file = locWrap(file, location);
	if (file == null \|\| visibleSources.isEmpty()) {
	return file;
	}

	if (visibleSources.contains(file.toUri()) \|\| isModuleInfo(file)) {
	return file;
	}
	return null;
	}

	private boolean isModuleInfo(FileObject fo) {
	if (fo instanceof JavaFileObject) {
	JavaFileObject jfo = (JavaFileObject) fo;
	return jfo.isNameCompatible("module-info", Kind.SOURCE)
	\|\| jfo.isNameCompatible("module-info", Kind.CLASS);
	}
	return false;
	}

	@Override @DefinedBy(Api.COMPILER)
	public FileObject getFileForOutput(Location location,
	String packageName,
	String relativeName,
	FileObject sibling) throws IOException {
	FileObject superFile = super.getFileForOutput(location, packageName, relativeName, sibling);
	FileObject file = locWrap(superFile, location);
	if (file == null) return file;

	if (location.equals(StandardLocation.NATIVE_HEADER_OUTPUT) && superFile instanceof JavaFileObject) {
	file = new SmartFileObject((JavaFileObject) file);
	packageName = ":" + packageNameFromFileName(relativeName);
	}
	if (packageName.equals("")) {
	packageName = ":";
	}
	addArtifact(packageName, file.toUri());
	return file;
	}

	@Override
	public Location getModuleLocation(Location location, JavaFileObject fo, String pkgName) throws IOException {
	return super.getModuleLocation(location, locUnwrap(fo), pkgName);
	}

	private static String packageNameFromFileName(String fn) {
	StringBuilder sb = new StringBuilder();
	int p = fn.indexOf('_'), pp = 0;
	while (p != -1) {
	if (sb.length() > 0) sb.append('.');
	sb.append(fn.substring(pp,p));
	if (p == fn.length()-1) break;
	pp = p+1;
	p = fn.indexOf('_',pp);
	}
	return sb.toString();
	}

	void addArtifact(String pkgName, URI art) {
	Set<URI> s = packageArtifacts.get(pkgName);
	if (s == null) {
	s = new HashSet<>();
	packageArtifacts.put(pkgName, s);
	}
	s.add(art);
	}

	public static JavaFileObject locWrap(JavaFileObject jfo, Location loc) {

	// From sjavac's perspective platform classes are not interesting and
	// there is no need to track the location for these file objects.
	// Also, there exists some jfo instanceof checks which breaks if
	// the jfos for platform classes are wrapped.
	if (loc == StandardLocation.PLATFORM_CLASS_PATH)
	return jfo;

	return jfo == null ? null : new JavaFileObjectWithLocation<>(jfo, loc);
	}

	private static FileObject locWrap(FileObject fo, Location loc) {
	if (fo instanceof JavaFileObject)
	return locWrap((JavaFileObject) fo, loc);
	return fo == null ? null : new FileObjectWithLocation<>(fo, loc);
	}

	@DefinedBy(Api.COMPILER)
	@Override
	public boolean isSameFile(FileObject a, FileObject b) {
	return super.isSameFile(locUnwrap(a), locUnwrap(b));
	}

	private static ListBuffer<JavaFileObject> locWrapMany(Iterable<JavaFileObject> jfos,
	Location loc) {
	ListBuffer<JavaFileObject> locWrapped = new ListBuffer<>();
	for (JavaFileObject f : jfos)
	locWrapped.add(locWrap(f, loc));
	return locWrapped;
	}

	private static FileObject locUnwrap(FileObject fo) {
	if (fo instanceof FileObjectWithLocation<?>)
	return ((FileObjectWithLocation<?>) fo).getDelegate();
	if (fo instanceof JavaFileObjectWithLocation<?>)
	return ((JavaFileObjectWithLocation<?>) fo).getDelegate();
	return fo;
	}

	private static JavaFileObject locUnwrap(JavaFileObject fo) {
	if (fo instanceof JavaFileObjectWithLocation<?>)
	return ((JavaFileObjectWithLocation<?>) fo).getDelegate();
	return fo;
	}
	}