| /** |
| * 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.drill.exec.compile; |
| |
| import java.io.File; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| |
| import org.apache.drill.common.util.DrillStringUtils; |
| import org.apache.drill.exec.compile.ClassTransformer.ClassNames; |
| import org.apache.drill.exec.exception.ClassTransformationException; |
| import org.codehaus.commons.compiler.CompileException; |
| |
| public abstract class AbstractClassCompiler { |
| protected boolean debug = false; |
| |
| AbstractClassCompiler(boolean debug) { |
| this.debug = debug; |
| } |
| |
| public byte[][] getClassByteCode(ClassNames className, String sourceCode) |
| throws CompileException, IOException, ClassNotFoundException, ClassTransformationException { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Compiling (source size={}):\n{}", DrillStringUtils.readable(sourceCode.length()), prefixLineNumbers(sourceCode)); |
| |
| /* uncomment this to get a dump of the generated source in /tmp |
| // This can be used to write out the generated operator classes for debugging purposes |
| // TODO: should these be put into a directory named with the query id and/or fragment id |
| final int lastSlash = className.slash.lastIndexOf('/'); |
| final File dir = new File("/tmp", className.slash.substring(0, lastSlash)); |
| dir.mkdirs(); |
| final File file = new File(dir, className.slash.substring(lastSlash + 1) + ".java"); |
| final FileWriter writer = new FileWriter(file); |
| writer.write(sourceCode); |
| writer.close(); |
| */ |
| } |
| return getByteCode(className, sourceCode); |
| } |
| |
| protected String prefixLineNumbers(String code) { |
| if (!debug) { |
| return code; |
| } |
| |
| StringBuilder out = new StringBuilder(); |
| int i = 1; |
| for (String line : code.split("\n")) { |
| int start = out.length(); |
| out.append(i++); |
| int numLength = out.length() - start; |
| out.append(":"); |
| for (int spaces = 0; spaces < 7 - numLength; ++spaces) { |
| out.append(" "); |
| } |
| out.append(line); |
| out.append('\n'); |
| } |
| return out.toString(); |
| } |
| |
| protected abstract byte[][] getByteCode(ClassNames className, String sourcecode) |
| throws CompileException, IOException, ClassNotFoundException, ClassTransformationException; |
| |
| protected abstract org.slf4j.Logger getLogger(); |
| |
| } |