archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-20 19:14:38 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

6604599: ToolProvider should be less compiler-specific

Browse source 
Reviewed-by: darcy
This commit is contained in:
Jonathan Gibbons 2010-08-26 15:17:17 -07:00
parent 34fda8a36d
commit de9921986c
4 changed files with 363 additions and 66 deletions
Download patch file Download diff file Expand all files Collapse all files

177
langtools/src/share/classes/javax/tools/ToolProvider.java
View file

@ -26,10 +26,14 @@
package javax.tools;
import java.io.File;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.MalformedURLException;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.logging.Logger;
import java.util.logging.Level;
import static java.util.logging.Level.*;
@ -44,8 +48,6 @@ import static java.util.logging.Level.*;
*/
public class ToolProvider {
private ToolProvider() {}
private static final String propertyName = "sun.tools.ToolProvider";
private static final String loggerName = "javax.tools";
@ -87,6 +89,9 @@ public class ToolProvider {
return null;
}
private static final String defaultJavaCompilerName
= "com.sun.tools.javac.api.JavacTool";
/**
* Gets the Java™ programming language compiler provided
* with this platform.
@ -94,13 +99,7 @@ public class ToolProvider {
* {@code null} if no compiler is provided
*/
public static JavaCompiler getSystemJavaCompiler() {
if (Lazy.compilerClass == null)
return trace(WARNING, "Lazy.compilerClass == null");
try {
return Lazy.compilerClass.newInstance();
} catch (Throwable e) {
return trace(WARNING, e);
}
return instance().getSystemTool(JavaCompiler.class, defaultJavaCompilerName);
}
/**
@ -113,63 +112,109 @@ public class ToolProvider {
* or {@code null} if no tools are provided
*/
public static ClassLoader getSystemToolClassLoader() {
if (Lazy.compilerClass == null)
return trace(WARNING, "Lazy.compilerClass == null");
return Lazy.compilerClass.getClassLoader();
}
/**
* This class will not be initialized until one of the above
* methods are called. This ensures that searching for the
* compiler does not affect platform start up.
*/
static class Lazy {
private static final String defaultJavaCompilerName
= "com.sun.tools.javac.api.JavacTool";
private static final String[] defaultToolsLocation
= { "lib", "tools.jar" };
static final Class<? extends JavaCompiler> compilerClass;
static {
Class<? extends JavaCompiler> c = null;
try {
c = findClass().asSubclass(JavaCompiler.class);
} catch (Throwable t) {
trace(WARNING, t);
}
compilerClass = c;
}
private static Class<?> findClass()
throws MalformedURLException, ClassNotFoundException
{
try {
return enableAsserts(Class.forName(defaultJavaCompilerName, false, null));
} catch (ClassNotFoundException e) {
trace(FINE, e);
}
File file = new File(System.getProperty("java.home"));
if (file.getName().equalsIgnoreCase("jre"))
file = file.getParentFile();
for (String name : defaultToolsLocation)
file = new File(file, name);
URL[] urls = {file.toURI().toURL()};
trace(FINE, urls[0].toString());
ClassLoader cl = URLClassLoader.newInstance(urls);
cl.setPackageAssertionStatus("com.sun.tools.javac", true);
return Class.forName(defaultJavaCompilerName, false, cl);
}
private static Class<?> enableAsserts(Class<?> cls) {
try {
ClassLoader loader = cls.getClassLoader();
if (loader != null)
loader.setPackageAssertionStatus("com.sun.tools.javac", true);
else
trace(FINE, "loader == null");
} catch (SecurityException ex) {
trace(FINE, ex);
}
return cls;
try {
Class<? extends JavaCompiler> c =
instance().getSystemToolClass(JavaCompiler.class, defaultJavaCompilerName);
return c.getClassLoader();
} catch (Throwable e) {
return trace(WARNING, e);
}
}
private static ToolProvider instance;
private static synchronized ToolProvider instance() {
if (instance == null)
instance = new ToolProvider();
return instance;
}
// Cache for tool classes.
// Use weak references to avoid keeping classes around unnecessarily
private Map<String, Reference<Class<?>>> toolClasses = new HashMap<String, Reference<Class<?>>>();
// Cache for tool classloader.
// Use a weak reference to avoid keeping it around unnecessarily
private Reference<ClassLoader> refToolClassLoader = null;
private ToolProvider() { }
private <T> T getSystemTool(Class<T> clazz, String name) {
Class<? extends T> c = getSystemToolClass(clazz, name);
try {
return c.asSubclass(clazz).newInstance();
} catch (Throwable e) {
trace(WARNING, e);
return null;
}
}
private <T> Class<? extends T> getSystemToolClass(Class<T> clazz, String name) {
Reference<Class<?>> refClass = toolClasses.get(name);
Class<?> c = (refClass == null ? null : refClass.get());
if (c == null) {
try {
c = findSystemToolClass(name);
} catch (Throwable e) {
return trace(WARNING, e);
}
toolClasses.put(name, new WeakReference<Class<?>>(c));
}
return c.asSubclass(clazz);
}
private static final String[] defaultToolsLocation = { "lib", "tools.jar" };
private Class<?> findSystemToolClass(String toolClassName)
throws MalformedURLException, ClassNotFoundException
{
// try loading class directly, in case tool is on the bootclasspath
try {
return enableAsserts(Class.forName(toolClassName, false, null));
} catch (ClassNotFoundException e) {
trace(FINE, e);
// if tool not on bootclasspath, look in default tools location (tools.jar)
ClassLoader cl = (refToolClassLoader == null ? null : refToolClassLoader.get());
if (cl == null) {
File file = new File(System.getProperty("java.home"));
if (file.getName().equalsIgnoreCase("jre"))
file = file.getParentFile();
for (String name : defaultToolsLocation)
file = new File(file, name);
// if tools not found, no point in trying a URLClassLoader
// so rethrow the original exception.
if (!file.exists())
throw e;
URL[] urls = { file.toURI().toURL() };
trace(FINE, urls[0].toString());
cl = URLClassLoader.newInstance(urls);
cl.setPackageAssertionStatus("com.sun.tools.javac", true);
refToolClassLoader = new WeakReference<ClassLoader>(cl);
}
return Class.forName(toolClassName, false, cl);
}
}
private static Class<?> enableAsserts(Class<?> cls) {
try {
ClassLoader loader = cls.getClassLoader();
if (loader != null)
loader.setPackageAssertionStatus("com.sun.tools.javac", true);
else
trace(FINE, "loader == null");
} catch (SecurityException ex) {
trace(FINE, ex);
}
return cls;
}
}