com.querydsl.codegen.utils.JDKEvaluatorFactory Maven / Gradle / Ivy

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/*
 * Copyright 2010, Mysema Ltd
 *
 * 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 com.querydsl.codegen.utils;

import com.querydsl.codegen.utils.model.ClassType;
import com.querydsl.codegen.utils.model.Type;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.tools.JavaCompiler;
import javax.tools.SimpleJavaFileObject;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;

/**
 * JDKEvaluatorFactory is a factory implementation for creating Evaluator instances
 *
 * @author tiwe
 */
public class JDKEvaluatorFactory extends AbstractEvaluatorFactory {

  private final MemFileManager fileManager;

  private final String classpath;

  private final List compilationOptions;

  private final JavaCompiler compiler;

  public JDKEvaluatorFactory(ClassLoader parent) {
    this(parent, ToolProvider.getSystemJavaCompiler());
  }

  public JDKEvaluatorFactory(ClassLoader parent, JavaCompiler compiler) {
    this.fileManager =
        new MemFileManager(parent, compiler.getStandardFileManager(null, null, null));
    this.compiler = compiler;
    this.classpath = SimpleCompiler.getClassPath(parent);
    this.loader = fileManager.getClassLoader(StandardLocation.CLASS_OUTPUT);
    this.compilationOptions = Arrays.asList("-classpath", classpath, "-g:none");
  }

  @Override
  protected void compile(
      String source,
      ClassType projectionType,
      String[] names,
      Type[] types,
      String id,
      Map constants)
      throws IOException {
    // create source
    source = createSource(source, projectionType, names, types, id, constants);

    // compile
    SimpleJavaFileObject javaFileObject = new MemSourceFileObject(id, source);
    Writer out = new StringWriter();

    var task =
        compiler.getTask(
            out,
            fileManager,
            null,
            compilationOptions,
            null,
            Collections.singletonList(javaFileObject));
    if (!task.call().booleanValue()) {
      throw new CodegenException("Compilation of " + source + " failed.\n" + out.toString());
    }
  }
}