com.google.common.truth.codegen
Class CompilingClassLoader
java.lang.Object
java.lang.ClassLoader
com.google.common.truth.codegen.CompilingClassLoader
@GwtIncompatible(value="java.lang.reflect.*")
public class CompilingClassLoader
- extends ClassLoader
This is a Java ClassLoader that will attempt to load a class from a string of source code.
Example
String className = "com.foo.MyClass";
String classSource =
"package com.foo;\n" +
"public class MyClass implements Runnable {\n" +
" @Override public void run() {\n" +
" log(\"Hello world\");\n" +
" }\n" +
"}";
// Load class from source.
ClassLoader classLoader = new CompilingClassLoader(
parentClassLoader, className, classSource);
Class myClass = classLoader.loadClass(className);
// Use it.
Runnable instance = (Runnable)myClass.newInstance();
instance.run();
Only one chunk of source can be compiled per instance of CompilingClassLoader. If you need to
compile more, create multiple CompilingClassLoader instances.
Uses Java 1.6's in built compiler API.
If the class cannot be compiled, loadClass() will throw a ClassNotFoundException and log the
compile errors to System.err. If you don't want the messages logged, or want to explicitly handle
the messages you can provide your own DiagnosticListener
through
{#setDiagnosticListener()}.
- See Also:
ClassLoader
,
JavaCompiler
Methods inherited from class java.lang.ClassLoader |
clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, loadClass, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
CompilingClassLoader
public CompilingClassLoader(ClassLoader parent,
String className,
String sourceCode,
DiagnosticListener<JavaFileObject> diagnosticListener)
throws CompilingClassLoader.CompilerException
- Parameters:
parent
- Parent classloader to resolve dependencies from.className
- Name of class to compile. eg. "com.foo.MyClass".sourceCode
- Java source for class. e.g. "package com.foo; class MyClass { ... }".diagnosticListener
- Notified of compiler errors (may be null).
- Throws:
CompilingClassLoader.CompilerException
findClass
public Class<?> findClass(String name)
throws ClassNotFoundException
- Override ClassLoader's class resolving method. Don't call this directly, instead use
ClassLoader.loadClass(String)
.
- Overrides:
findClass
in class ClassLoader
- Throws:
ClassNotFoundException
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