corejava第10版

corejava第10版/v2ch08/compiler/CompilerTest.java

@@ -0,0 +1,101 @@
+package compiler;
+
+import java.awt.*;
+import java.io.*;
+import java.util.*;
+import java.util.List;
+import javax.swing.*;
+import javax.tools.*;
+import javax.tools.JavaFileObject.*;
+
+/**
+ * @version 1.01 2016-05-10
+ * @author Cay Horstmann
+ */
+public class CompilerTest
+{
+   public static void main(final String[] args) throws IOException, ClassNotFoundException
+   {
+      JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
+
+      final List<ByteArrayJavaClass> classFileObjects = new ArrayList<>();
+
+      DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<>();
+
+      JavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, null, null);
+      fileManager = new ForwardingJavaFileManager<JavaFileManager>(fileManager)
+         {
+            public JavaFileObject getJavaFileForOutput(Location location, final String className,
+                  Kind kind, FileObject sibling) throws IOException
+            {
+               if (className.startsWith("x."))
+               {
+                  ByteArrayJavaClass fileObject = new ByteArrayJavaClass(className);
+                  classFileObjects.add(fileObject);
+                  return fileObject;
+               }
+               else return super.getJavaFileForOutput(location, className, kind, sibling);
+            }
+         };
+
+
+      String frameClassName = args.length == 0 ? "buttons2.ButtonFrame" : args[0]; 
+      JavaFileObject source = buildSource(frameClassName);
+      JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, diagnostics, null,
+            null, Arrays.asList(source));
+      Boolean result = task.call();
+
+      for (Diagnostic<? extends JavaFileObject> d : diagnostics.getDiagnostics())
+         System.out.println(d.getKind() + ": " + d.getMessage(null));
+      fileManager.close();
+      if (!result)
+      {
+         System.out.println("Compilation failed.");
+         System.exit(1);
+      }
+
+      EventQueue.invokeLater(() ->
+         {
+            try
+            {
+               Map<String, byte[]> byteCodeMap = new HashMap<>();
+               for (ByteArrayJavaClass cl : classFileObjects)
+                  byteCodeMap.put(cl.getName().substring(1), cl.getBytes());
+               ClassLoader loader = new MapClassLoader(byteCodeMap);
+               JFrame frame = (JFrame) loader.loadClass("x.Frame").newInstance();
+               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+               frame.setTitle("CompilerTest");
+               frame.setVisible(true);
+            }
+            catch (Exception ex)
+            {
+               ex.printStackTrace();
+            }
+         });
+   }
+
+   /*
+    * Builds the source for the subclass that implements the addEventHandlers method.
+    * @return a file object containing the source in a string builder
+    */
+   static JavaFileObject buildSource(String superclassName) 
+      throws IOException, ClassNotFoundException
+   {
+      StringBuilderJavaSource source = new StringBuilderJavaSource("x.Frame");
+      source.append("package x;\n");
+      source.append("public class Frame extends " + superclassName + " {");
+      source.append("protected void addEventHandlers() {");
+      final Properties props = new Properties();
+      props.load(Class.forName(superclassName).getResourceAsStream("action.properties"));
+      for (Map.Entry<Object, Object> e : props.entrySet())
+      {
+         String beanName = (String) e.getKey();
+         String eventCode = (String) e.getValue();
+         source.append(beanName + ".addActionListener(event -> {");
+         source.append(eventCode);
+         source.append("} );");
+      }
+      source.append("} }");
+      return source;
+   }
+}