exec/java-exec/src/main/java/org/apache/drill/exec/compile/DrillJavaFileManager.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.drill.exec.compile;

import java.io.IOException;
import java.util.Set;

import javax.tools.FileObject;
import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.JavaFileObject.Kind;

import com.google.common.base.Predicate;
import com.google.common.collect.Sets;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/* package */
class DrillJavaFileManager extends ForwardingJavaFileManager<JavaFileManager> {
  private static final Logger logger = LoggerFactory.getLogger(DrillJavaFileManager.class);

  public static final Predicate<Kind> NO_SOURCES_KIND = input -> input != Kind.SOURCE;

  private final ClassLoader classLoader;

  protected DrillJavaFileManager(JavaFileManager fileManager, ClassLoader classLoader) {
    super(fileManager);
    this.classLoader = classLoader;
  }

  @Override
  public ClassLoader getClassLoader(Location location) {
    return classLoader;
  }

  @Override
  public Iterable<JavaFileObject> list(Location location, String packageName, Set<Kind> kinds, boolean recurse) throws IOException {
    return super.list(location, packageName, Sets.filter(kinds, NO_SOURCES_KIND), recurse);
  }

  @Override
  public JavaFileObject getJavaFileForOutput(Location location, String className, Kind kind, FileObject sibling) throws IOException {
    logger.trace("Creating JavaFileForOutput@(location:{}, className:{}, kinds:{})", location, className, kind);
    if (sibling instanceof DrillJavaFileObject) {
      return ((DrillJavaFileObject) sibling).addOutputJavaFile(className);
    }
    throw new IOException("The source file passed to getJavaFileForOutput() is not a DrillJavaFileObject: " + sibling);
  }

}