lang/java/maven-plugin/src/main/java/org/apache/avro/mojo/IDLProtocolMojo.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.avro.mojo;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;

import org.apache.avro.Protocol;
import org.apache.avro.compiler.idl.Idl;
import org.apache.avro.compiler.idl.ParseException;
import org.apache.avro.compiler.specific.SpecificCompiler;
import org.apache.avro.generic.GenericData;

import org.apache.maven.artifact.DependencyResolutionRequiredException;

/**
 * Generate Java classes and interfaces from AvroIDL files (.avdl)
 *
 * @goal idl-protocol
 * @requiresDependencyResolution runtime
 * @phase generate-sources
 * @threadSafe
 */
public class IDLProtocolMojo extends AbstractAvroMojo {
  /**
   * A set of Ant-like inclusion patterns used to select files from the source
   * directory for processing. By default, the pattern
   * <code>**&#47;*.avdl</code> is used to select IDL files.
   *
   * @parameter
   */
  private String[] includes = new String[] { "**/*.avdl" };

  /**
   * A set of Ant-like inclusion patterns used to select files from the source
   * directory for processing. By default, the pattern
   * <code>**&#47;*.avdl</code> is used to select IDL files.
   *
   * @parameter
   */
  private String[] testIncludes = new String[] { "**/*.avdl" };

  @Override
  protected void doCompile(String filename, File sourceDirectory, File outputDirectory) throws IOException {
    try {
      @SuppressWarnings("rawtypes")
      List runtimeClasspathElements = project.getRuntimeClasspathElements();
      Idl parser;

      List<URL> runtimeUrls = new ArrayList<URL>();

      // Add the source directory of avro files to the classpath so that
      // imports can refer to other idl files as classpath resources
      runtimeUrls.add(sourceDirectory.toURI().toURL());

      // If runtimeClasspathElements is not empty values add its values to Idl path.
      if (runtimeClasspathElements != null && !runtimeClasspathElements.isEmpty()) {
        for (Object runtimeClasspathElement : runtimeClasspathElements) {
          String element = (String) runtimeClasspathElement;
          runtimeUrls.add(new File(element).toURI().toURL());
      }
      }

      URLClassLoader projPathLoader = new URLClassLoader
          (runtimeUrls.toArray(new URL[0]), Thread.currentThread().getContextClassLoader());
        parser = new Idl(new File(sourceDirectory, filename), projPathLoader);

      Protocol p = parser.CompilationUnit();
      String json = p.toString(true);
      Protocol protocol = Protocol.parse(json);
      SpecificCompiler compiler = new SpecificCompiler(protocol);
      compiler.setStringType(GenericData.StringType.valueOf(stringType));
      compiler.setTemplateDir(templateDirectory);
      compiler.setFieldVisibility(getFieldVisibility());
      compiler.setCreateSetters(createSetters);
      compiler.compileToDestination(null, outputDirectory);
    } catch (ParseException e) {
      throw new IOException(e);
    } catch (DependencyResolutionRequiredException drre) {
      throw new IOException(drre);
    }
  }

  @Override
  protected String[] getIncludes() {
    return includes;
  }


  @Override
  protected String[] getTestIncludes() {
    return testIncludes;
  }
}