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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.common.compiler.support;
import javassist.CtClass;
import java.util.Arrays;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* JavassistCompiler. (SPI, Singleton, ThreadSafe)
*/
public class JavassistCompiler extends AbstractCompiler {
public static final String NAME = "javassist";
private static final Pattern IMPORT_PATTERN = Pattern.compile("import\\s+([\\w\\.\\*]+);\n");
private static final Pattern EXTENDS_PATTERN = Pattern.compile("\\s+extends\\s+([\\w\\.]+)[^\\{]*\\{\n");
private static final Pattern IMPLEMENTS_PATTERN = Pattern.compile("\\s+implements\\s+([\\w\\.]+)\\s*\\{\n");
private static final Pattern METHODS_PATTERN = Pattern.compile("\n(private|public|protected)\\s+");
private static final Pattern FIELD_PATTERN = Pattern.compile("[^\n]+=[^\n]+;");
@Override
public Class doCompile(String name, String source) throws Throwable {
CtClassBuilder builder = new CtClassBuilder();
builder.setClassName(name);
// process imported classes
Matcher matcher = IMPORT_PATTERN.matcher(source);
while (matcher.find()) {
builder.addImports(matcher.group(1).trim());
}
// process extended super class
matcher = EXTENDS_PATTERN.matcher(source);
if (matcher.find()) {
builder.setSuperClassName(matcher.group(1).trim());
}
// process implemented interfaces
matcher = IMPLEMENTS_PATTERN.matcher(source);
if (matcher.find()) {
String[] ifaces = matcher.group(1).trim().split("\\,");
Arrays.stream(ifaces).forEach(i -> builder.addInterface(i.trim()));
}
// process constructors, fields, methods
String body = source.substring(source.indexOf('{') + 1, source.length() - 1);
String[] methods = METHODS_PATTERN.split(body);
String className = ClassUtils.getSimpleClassName(name);
Arrays.stream(methods).map(String::trim).filter(m -> !m.isEmpty()).forEach(method -> {
if (method.startsWith(className)) {
builder.addConstructor("public " + method);
} else if (FIELD_PATTERN.matcher(method).matches()) {
builder.addField("private " + method);
} else {
builder.addMethod("public " + method);
}
});
// compile
ClassLoader classLoader = org.apache.dubbo.common.utils.ClassUtils.getCallerClassLoader(getClass());
CtClass cls = builder.build(classLoader);
return cls.toClass(classLoader, JavassistCompiler.class.getProtectionDomain());
}
}