Android Open Source - GenDbHandler Bug300408

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Java Source Code

package net.cattaka.util.gendbhandler.apt;
/* w w  w. j av  a2 s .c  o m*/
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.TreeMap;

import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;

/**
 * https://bugs.eclipse.org/bugs/show_bug.cgi?id=300408
 */
public class Bug300408 {

  public static List<? extends Element> getEnclosedElementsDeclarationOrder(
      TypeElement type) {
    List<? extends Element> result = null;
    try {
      Object binding = field(type, "_binding");

      Class<?> sourceTypeBinding = null;
      {
        Class<?> c = binding.getClass();
        do {
          if (c.getCanonicalName()
              .equals("org.eclipse.jdt.internal.compiler.lookup.SourceTypeBinding")) {
            sourceTypeBinding = c;
            break;
          }
        } while ((c = c.getSuperclass()) != null);
      }

      final List<Object> declarationOrder;
      if (sourceTypeBinding != null) {
        declarationOrder = findSourceOrder(binding);

        List<Element> enclosedElements = new ArrayList<Element>(
          type.getEnclosedElements());
        Collections.sort(enclosedElements, new Comparator<Element>() {
  
          public int compare(Element o1, Element o2) {
            try {
              Object o1Binding = field(o1, "_binding");
              Object o2Binding = field(o2, "_binding");
  
              int i1 = declarationOrder.indexOf(o1Binding);
              int i2 = declarationOrder.indexOf(o2Binding);
  
              return i1 - i2;
            } catch (Exception e) {
              return 0;
            }
          }
  
        });
        result = enclosedElements;
      }
    } catch (Exception e) {
      // ignore
    }
    return (result != null) ? result : type.getEnclosedElements();
  }

  private static List<Object> findSourceOrder(Object binding)
      throws Exception {
    Object referenceContext = field(field(binding, "scope"),
        "referenceContext");

    TreeMap<Integer, Object> orderedBindings = new TreeMap<Integer, Object>();

    collectSourceOrder(orderedBindings, referenceContext, "methods");
    collectSourceOrder(orderedBindings, referenceContext, "fields");
    collectSourceOrder(orderedBindings, referenceContext, "memberTypes");

    return new ArrayList<Object>(orderedBindings.values());
  }

  private static void collectSourceOrder(
      TreeMap<Integer, Object> orderedBindings, Object referenceContext,
      String fieldName) throws Exception {
    Object[] declarations = (Object[]) field(referenceContext, fieldName);
    if (declarations != null) {
      for (int i = 0; i < declarations.length; i++) {
        Integer declarationSourceStart = (Integer) field(
            declarations[i], "declarationSourceStart");
        orderedBindings.put(declarationSourceStart,
            field(declarations[i], "binding"));
      }
    }
  }

  private static Object field(Object o, String fieldName) throws Exception {
    if (o == null) {
      return null;
    }
    Field field = o.getClass().getField(fieldName);
    field.setAccessible(true);
    return field.get(o);
  }
}

Java Source Code List