/* | |
* Copyright 1999-2011 Alibaba Group. | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package com.alibaba.dubbo.common.compiler.support; | |
import java.util.regex.Matcher; | |
import java.util.regex.Pattern; | |
import com.alibaba.dubbo.common.compiler.Compiler; | |
/** | |
* Abstract compiler. (SPI, Prototype, ThreadSafe) | |
* | |
* @author william.liangf | |
*/ | |
public abstract class AbstractCompiler implements Compiler { | |
private static final Pattern PACKAGE_PATTERN = Pattern.compile("package\\s+([_a-zA-Z][_a-zA-Z0-9\\.]*);"); | |
private static final Pattern CLASS_PATTERN = Pattern.compile("class\\s+([_a-zA-Z][_a-zA-Z0-9]*)\\s+"); | |
public Class<?> compile(String code, ClassLoader classLoader) { | |
code = code.trim(); | |
Matcher matcher = PACKAGE_PATTERN.matcher(code); | |
String pkg; | |
if (matcher.find()) { | |
pkg = matcher.group(1); | |
} else { | |
pkg = ""; | |
} | |
matcher = CLASS_PATTERN.matcher(code); | |
String cls; | |
if (matcher.find()) { | |
cls = matcher.group(1); | |
} else { | |
throw new IllegalArgumentException("No such class name in " + code); | |
} | |
String className = pkg != null && pkg.length() > 0 ? pkg + "." + cls : cls; | |
try { | |
return Class.forName(className, true, Thread.currentThread().getContextClassLoader()); | |
} catch (ClassNotFoundException e) { | |
if (! code.endsWith("}")) { | |
throw new IllegalStateException("The java code not endsWith \"}\", code: \n" + code + "\n"); | |
} | |
try { | |
return doCompile(className, code); | |
} catch (RuntimeException t) { | |
throw t; | |
} catch (Throwable t) { | |
throw new IllegalStateException("Failed to compile class, cause: " + t.getMessage() + ", class: " + className + ", code: \n" + code + "\n, stack: " + ClassUtils.toString(t)); | |
} | |
} | |
} | |
protected abstract Class<?> doCompile(String name, String source) throws Throwable; | |
} |