CCompiler.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * 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 org.kaaproject.kaa.avro.avrogen.compiler;

import org.apache.avro.Schema;
import org.apache.velocity.VelocityContext;
import org.kaaproject.kaa.avro.avrogen.GenerationContext;
import org.kaaproject.kaa.avro.avrogen.KaaGeneratorException;
import org.kaaproject.kaa.avro.avrogen.StyleUtils;
import org.kaaproject.kaa.avro.avrogen.TypeConverter;

import java.io.OutputStream;
import java.io.StringWriter;
import java.util.List;
import java.util.Map;

public class CCompiler extends Compiler {

  public CCompiler(String schemaPath, String outputPath, String sourceName)
      throws KaaGeneratorException {
    super(schemaPath, outputPath, sourceName);
  }

  public CCompiler(Schema schema, String sourceName, OutputStream hdrS, OutputStream srcS)
      throws KaaGeneratorException {
    super(schema, sourceName, hdrS, srcS);
  }

  public CCompiler(List<Schema> schemas, String sourceName, OutputStream hdrS, OutputStream srcS)
      throws KaaGeneratorException {
    super(schemas, sourceName, hdrS, srcS);
  }

  @Override
  protected String headerTemplateGen() {
    return "src/main/resources/header.tmpl.gen";
  }

  @Override
  protected String sourceTemplateGen() {
    return "src/main/resources/source.tmpl.gen";
  }

  @Override
  protected String headerTemplate() {
    return "header.tmpl";
  }

  @Override
  protected String sourceTemplate() {
    return "source.tmpl";
  }

  @Override
  protected String getSourceExtension() {
    return ".c";
  }

  @Override
  protected void doGenerate() {
    for (Map.Entry<Schema, GenerationContext> cursor : schemaGenerationQueue.entrySet()) {
      switch (cursor.getKey().getType()) {
        case RECORD:
          processRecord(cursor.getKey(), "record.h.vm", "record.c.vm");
          break;
        case UNION:
          processUnion(cursor.getKey(), cursor.getValue());
          break;
        case ENUM:
          processEnum(cursor.getKey(), "enum.h.vm");
          break;
        default:
          break;
      }
    }
    completeGeneration();
  }

  private void processUnion(Schema schema, GenerationContext genContext) {
    VelocityContext context = new VelocityContext();

    context.put("schema", schema);
    context.put("generationContext", genContext);
    context.put("StyleUtils", StyleUtils.class);
    context.put("TypeConverter", TypeConverter.class);
    context.put("namespacePrefix", namespacePrefix);

    StringWriter headerWriter = new StringWriter();
    engine.getTemplate("union.h.vm").merge(context, headerWriter);
    appendResult(headerWriter.toString(), true);

    StringWriter sourceWriter = new StringWriter();
    engine.getTemplate("union.c.vm").merge(context, sourceWriter);
    appendResult(sourceWriter.toString(), false);
  }

  private void completeGeneration() {
    headerWriter.write("#ifdef __cplusplus\n}      /* extern \"C\" */\n#endif\n#endif");
  }
}