Android Open Source - storm-gen Converter Processor

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License

The source code is released under:

Apache License

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Java Source Code

/*******************************************************************************
 * Copyright 2012 Google, Inc.//  www. ja v a 2 s  . co  m
 *
 * 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.turbomanage.storm.apt.converter;

import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;

import com.turbomanage.storm.api.Converter;
import com.turbomanage.storm.apt.ClassProcessor;
import com.turbomanage.storm.apt.StormEnvironment;
import com.turbomanage.storm.types.TypeConverter.BindType;
import com.turbomanage.storm.types.TypeConverter.SqlType;

public class ConverterProcessor extends ClassProcessor {

  private ConverterModel cm;

  public ConverterProcessor(Element el, StormEnvironment stormEnv) {
    super(el, stormEnv);
  }

  @Override
  protected ConverterModel getModel() {
    return cm;
  }

  @Override
  // TODO verify presence of static GET field
  public void populateModel() {
    String converterClass = this.typeElement.getQualifiedName().toString();
    Converter annotation = this.typeElement.getAnnotation(Converter.class);
    BindType bindType = annotation.bindType();
    SqlType sqlType = annotation.sqlType();
    // Read forTypes={byte.class,Byte.class} into String[]
    // This is complicated because you can't directly reference class values in annotations
    List<? extends AnnotationMirror> annoMirrors = this.typeElement
        .getAnnotationMirrors();
    for (AnnotationMirror anno : annoMirrors) {
      Map<? extends ExecutableElement, ? extends AnnotationValue> annoValues = anno
          .getElementValues();
      for (Entry<? extends ExecutableElement, ? extends AnnotationValue> e : annoValues.entrySet()) {
        String key = e.getKey().getSimpleName().toString();
        if ("forTypes".equals(key)) {
          AnnotationValue val = e.getValue();
          String[] types = val.accept(
              new ConverterTypeAnnotationValuesVisitor(),
              stormEnv.getLogger());
          this.cm = new ConverterModel(converterClass, types, bindType, sqlType);
          if (!stormEnv.addConverter(this.cm))
            stormEnv.getLogger()
            .error("Converter already registered for type "
                , this.typeElement);
        }
      }
    }
  }

}

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