Created utility class to casually inspect class files on the usage of classes, fields and methods

test/bytecode/resource/Bar.java

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+public interface Bar extends java.util.RandomAccess, java.util.Map {
+	String getName();
+}

test/bytecode/resource/Baz.java

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+public interface Baz {
+}

test/bytecode/resource/Buux.java

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+public class Buux extends java.util.ArrayList {
+	public Buux() {
+		super(7);
+		addSomething();
+	}
+	
+	public void addSomething() {
+		super.add("H\u3404l\0");
+	}
+}

test/bytecode/resource/Foo.java

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+public class Foo implements java.util.RandomAccess {
+	private static final String ONE = "Eén";
+	
+	{
+		String value = toString();
+		System.out.print(value);
+		System.out.print("Two" + "Four");
+	}
+}

test/bytecode/src/lombok/bytecode/ClassFileMetaDataTest.java

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+/*
+ * Copyright © 2010 Reinier Zwitserloot and Roel Spilker.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package lombok.bytecode;
+
+import static org.junit.Assert.*;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import javax.tools.JavaCompiler;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.ToolProvider;
+import javax.tools.JavaCompiler.CompilationTask;
+
+import lombok.Lombok;
+
+import org.junit.Test;
+
+public class ClassFileMetaDataTest {
+	
+	private ClassFileMetaData foo = create(new File("test/bytecode/resource/Foo.java"));
+	private ClassFileMetaData bar = create(new File("test/bytecode/resource/Bar.java"));
+	private ClassFileMetaData baz = create(new File("test/bytecode/resource/Baz.java"));
+	private ClassFileMetaData buux = create(new File("test/bytecode/resource/Buux.java"));
+	
+	@Test
+	public void testGetClassName() {
+		assertTrue(foo.containsUtf8("Foo"));
+		assertEquals("Foo", foo.getClassName());
+
+		assertTrue(bar.containsUtf8("Bar"));
+		assertEquals("Bar", bar.getClassName());
+		
+		assertTrue(baz.containsUtf8("Baz"));
+		assertEquals("Baz", baz.getClassName());
+	}
+	
+	@Test
+	public void testGetSuperClassName() {
+		assertTrue(foo.containsUtf8("java/lang/Object"));
+		assertEquals("java/lang/Object", foo.getSuperClassName());
+
+		assertEquals("java/lang/Object", bar.getSuperClassName());
+		assertEquals("java/lang/Object", baz.getSuperClassName());
+		
+		assertEquals("java/util/ArrayList", buux.getSuperClassName());
+	}
+	
+	
+	
+	@Test
+	public void testUsesClass() {
+		assertTrue(foo.usesClass("java/lang/System"));
+//		assertTrue(foo.usesClass("java/lang/String"));
+	}
+	
+	@Test
+	public void testUsesField() {
+		assertTrue(foo.usesField("java/lang/System", "out"));
+	}
+	
+	@Test
+	public void testUsesMethodWithName() {
+		assertTrue(foo.usesMethod("java/io/PrintStream", "print"));
+		
+		assertTrue(buux.usesMethod("java/util/ArrayList", "<init>"));
+		assertTrue(buux.usesMethod("java/util/ArrayList", "add"));
+		assertTrue(buux.usesMethod("Buux", "addSomething"));
+	}
+	
+	@Test
+	public void testUsesMethodWithNameAndDescriptor() {
+		assertTrue(foo.usesMethod("java/io/PrintStream", "print", "(Ljava/lang/String;)V"));
+		
+		assertTrue(buux.usesMethod("java/util/ArrayList", "<init>", "(I)V"));
+		assertTrue(buux.usesMethod("java/util/ArrayList", "add", "(Ljava/lang/Object;)Z"));
+		assertTrue(buux.usesMethod("Buux", "addSomething", "()V"));
+	}
+	
+	@Test
+	public void testGetInterfaces() {
+		assertTrue(foo.containsUtf8("java/util/RandomAccess"));
+		
+		List<String> fooInterfaces = foo.getInterfaces();
+		assertEquals(1, fooInterfaces.size());
+		assertEquals("java/util/RandomAccess", fooInterfaces.get(0));
+		
+		assertTrue(bar.containsUtf8("java/util/RandomAccess"));
+		assertTrue(bar.containsUtf8("java/util/Map"));
+		
+		List<String> barInterfaces = bar.getInterfaces();
+		assertEquals(2, barInterfaces.size());
+		assertEquals("java/util/RandomAccess", barInterfaces.get(0));
+		assertEquals("java/util/Map", barInterfaces.get(1));
+	}
+	
+	@Test
+	public void testContainsStringConstant() {
+		assertTrue(foo.containsStringConstant("Eén"));
+		assertTrue(foo.containsStringConstant("TwoFour"));
+		
+		assertTrue(buux.containsStringConstant("H\u3404l\0"));
+	}
+	
+	private ClassFileMetaData create(File file) {
+		return new ClassFileMetaData(compile(file));
+	}
+	
+	private byte[] compile(File file) {
+		try {
+			JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
+			File tempDir = getTempDir();
+			tempDir.mkdirs();
+			List<String> options = Arrays.asList("-nowarn", "-proc:none", "-d", tempDir.getAbsolutePath());
+			StringWriter captureWarnings = new StringWriter();
+			CompilationTask task = compiler.getTask(captureWarnings, null, null, options, null, Collections.singleton(new ContentBasedJavaFileObject(file.getPath(), readFileAsString(file))));
+			assertTrue(task.call());
+			return PostCompilerApp.readFile(new File(tempDir, file.getName().replaceAll("\\.java$", ".class")));
+		} catch (Exception e) {
+			throw Lombok.sneakyThrow(e);
+		}
+	}
+	
+	private File getTempDir() {
+		String[] rawDirs = {
+				System.getProperty("java.io.tmpdir"),
+				"/tmp",
+				"C:\\Windows\\Temp"
+		};
+		
+		for (String dir : rawDirs) {
+			if (dir == null) continue;
+			File f = new File(dir);
+			if (!f.isDirectory()) continue;
+			return new File(f, "lombok.bytecode-test");
+		}
+		
+		return new File("./build/tmp");
+	}
+	
+	static class ContentBasedJavaFileObject extends SimpleJavaFileObject {
+		private final String content;
+		
+		protected ContentBasedJavaFileObject(String name, String content) {
+			super(new File(name).toURI(), Kind.SOURCE);
+			this.content = content;
+		}
+		
+		@Override
+		public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
+			return content;
+		}
+	}
+	
+	private String readFileAsString(File file) {
+		try {
+			BufferedReader reader = new BufferedReader(new FileReader(file));
+			StringWriter writer = new StringWriter();
+			String line = reader.readLine();
+			while(line != null) {
+				writer.append(line).append("\n");
+				line = reader.readLine();
+			}
+			reader.close();
+			writer.close();
+			return writer.toString();
+		} catch (Exception e) {
+			throw Lombok.sneakyThrow(e);
+		}
+	}
+}