hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/record/compiler/CppGenerator.java

/**
 * 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.hadoop.record.compiler;

import java.io.Writer;
import java.util.ArrayList;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;

import org.apache.commons.io.Charsets;
import org.apache.commons.io.output.FileWriterWithEncoding;
import org.apache.hadoop.util.StringUtils;

/**
 * C++ Code generator front-end for Hadoop record I/O.
 */
class CppGenerator extends CodeGenerator {
  
  CppGenerator() {
  }
  
  /**
   * Generate C++ code. This method only creates the requested file(s)
   * and spits-out file-level elements (such as include statements etc.)
   * record-level code is generated by JRecord.
   */
  @Override
  void genCode(String name, ArrayList<JFile> ilist,
               ArrayList<JRecord> rlist, String destDir, ArrayList<String> options)
    throws IOException {
    name = new File(destDir, (new File(name)).getName()).getAbsolutePath();

    try (Writer cc = new FileWriterWithEncoding(name+".cc", Charsets.UTF_8);
         Writer hh = new FileWriterWithEncoding(name+".hh", Charsets.UTF_8)) {
      String fileName = (new File(name)).getName();
      hh.write("#ifndef __"+
          StringUtils.toUpperCase(fileName).replace('.','_')+"__\n");
      hh.write("#define __"+
          StringUtils.toUpperCase(fileName).replace('.','_')+"__\n");
      hh.write("#include \"recordio.hh\"\n");
      hh.write("#include \"recordTypeInfo.hh\"\n");
      for (Iterator<JFile> iter = ilist.iterator(); iter.hasNext();) {
        hh.write("#include \""+iter.next().getName()+".hh\"\n");
      }

      cc.write("#include \""+fileName+".hh\"\n");
      cc.write("#include \"utils.hh\"\n");

      for (Iterator<JRecord> iter = rlist.iterator(); iter.hasNext();) {
        iter.next().genCppCode(hh, cc, options);
      }

      hh.write("#endif //"+
          StringUtils.toUpperCase(fileName).replace('.','_')+"__\n");
    }
  }
}