private PSItemDoc(ClassDoc classDoc) {
    this.classDoc = classDoc;
    this.name = classDoc.name();
    this.description = classDoc.commentText();
    this.itemFieldDocs = new ArrayList<>();
    this.providerDocs = new ArrayList<>();

    List<FieldDoc> allFields = new ArrayList<>();
    this.getAllFieldDocs(classDoc, allFields);

    for (FieldDoc fieldDoc : allFields) {
        PSItemFieldDoc itemFieldDoc = PSItemFieldDoc.build(this, fieldDoc);
        if (itemFieldDoc != null) this.itemFieldDocs.add(itemFieldDoc);
    }

    for (MethodDoc methodDoc : classDoc.methods()) {
        PSOperatorDoc providerDoc = PSOperatorDoc.build(classDoc, methodDoc);
        if (providerDoc != null) this.providerDocs.add(providerDoc);
    }
}
 

protected static String processExternalResources(ClassDoc classDoc) {
  StringBuilder cpText =
      new StringBuilder(
          "<dt><b>Configuration Parameters:</b></dt><dd><table><tr style=\"text-align: left\"><th>Parameter</th><th>Description</th><th>Default Value(s)</th></tr>");
  Map<String, String> rows = new TreeMap<>();

  for (FieldDoc field : getFields(classDoc)) {
    Entry<String, String> entry = createParameterRow(field);
    if (entry != null) {
      rows.put(entry.getKey(), entry.getValue());
    }
  }

  if (rows.isEmpty()) {
    cpText.setLength(0);
  } else {
    for (String s : rows.values()) {
      cpText.append(s);
    }
  }

  cpText.append("</table></dd>");
  return cpText.toString();
}
 

protected static String processConfigurationParameters(ClassDoc classDoc) {
  StringBuilder erText = new StringBuilder("<dt><b>External Resources:</b></dt><dd><ul>");

  List<String> resources = new ArrayList<>();
  for (FieldDoc field : getFields(classDoc)) {
    resources.addAll(createResourceItem(field));
  }

  if (resources.isEmpty()) {
    return null;
  } else {
    for (String s : resources) {
      erText.append(wrapWithTag("li", s, null));
    }
  }

  erText.append("</ul></dd>");
  return erText.toString();
}
 

private static Entry<String, String> createParameterRow(FieldDoc field) {
  Tag[] tags = field.tags("@" + ConfigurationParameters.NAME);
  if (tags.length == 0) {
    return null;
  }

  String name = wrapWithTag("td", field.constantValue(), "padding-right: 20px");
  String desc = wrapWithTag("td", field.commentText(), "padding-right: 20px");

  StringBuilder defaultValues = new StringBuilder("");
  for (Tag tag : tags) {
    defaultValues.append(tag.text());
    defaultValues.append("<br />");
  }
  String values = wrapWithTag("td", defaultValues.toString(), null);

  String row = wrapWithTag("tr", name + desc + values, null);

  return new AbstractMap.SimpleEntry<>(field.constantValue().toString(), row);
}
 

@Override
public Content getSignature(FieldDoc field) {
	final Content pre = new HtmlTree(HtmlTag.PRE);
	addAnnotations(field, pre);
	addModifiers(field, pre);
	if ((field.modifierSpecifier() & Modifier.FINAL) != 0) {
		pre.addContent(Utils.keyword(Utils.getKeywords().getValKeyword()));
	} else {
		pre.addContent(Utils.keyword(Utils.getKeywords().getVarKeyword()));
	}
	pre.addContent(this.writer.getSpace());
	if (this.configuration.linksource) {
		final Content fieldName = new StringContent(field.name());
		this.writer.addSrcLink(field, fieldName, pre);
	} else {
		addName(field.name(), pre);
	}
	pre.addContent(this.writer.getSpace());
	pre.addContent(Utils.getKeywords().getColonKeyword());
	pre.addContent(" "); //$NON-NLS-1$
	final  Content fieldlink = this.writer.getLink(new LinkInfoImpl(
			this.configuration, LinkInfoImpl.Kind.MEMBER, field.type()));
	pre.addContent(fieldlink);
	return pre;
}
 

/**
 * Parses an enum type definition
 * 
 * @param fieldDoc
 * @return
 */
protected EnumConstant parseEnumConstant(FieldDoc fieldDoc) {
	EnumConstant enumConstant = objectFactory.createEnumConstant();
	enumConstant.setName(fieldDoc.name());
	String comment = fieldDoc.commentText();
	if (comment.length() > 0) {
		enumConstant.setComment(comment);
	}

	for (AnnotationDesc annotationDesc : fieldDoc.annotations()) {
		enumConstant.getAnnotation().add(parseAnnotationDesc(annotationDesc, fieldDoc.qualifiedName()));
	}

	for (Tag tag : fieldDoc.tags()) {
		enumConstant.getTag().add(parseTag(tag));
	}

	return enumConstant;
}
 

protected Field parseField(FieldDoc fieldDoc) {
	Field fieldNode = objectFactory.createField();
	fieldNode.setType(parseTypeInfo(fieldDoc.type()));
	fieldNode.setName(fieldDoc.name());
	fieldNode.setQualified(fieldDoc.qualifiedName());
	String comment = fieldDoc.commentText();
	if (comment.length() > 0) {
		fieldNode.setComment(comment);
	}
	fieldNode.setScope(parseScope(fieldDoc));
	fieldNode.setFinal(fieldDoc.isFinal());
	fieldNode.setStatic(fieldDoc.isStatic());
	fieldNode.setVolatile(fieldDoc.isVolatile());
	fieldNode.setTransient(fieldDoc.isTransient());
	fieldNode.setConstant(fieldDoc.constantValueExpression());

	for (AnnotationDesc annotationDesc : fieldDoc.annotations()) {
		fieldNode.getAnnotation().add(parseAnnotationDesc(annotationDesc, fieldDoc.qualifiedName()));
	}

	for (Tag tag : fieldDoc.tags()) {
		fieldNode.getTag().add(parseTag(tag));
	}

	return fieldNode;
}
 

private PSItemFieldDoc(PSItemDoc psItemDoc, FieldDoc fieldDoc, AnnotationDesc annotation) {
    this.psItemDoc = psItemDoc;
    this.reference = fieldDoc.name();
    this.name = fieldDoc.constantValue().toString();
    this.description = fieldDoc.commentText().replace('\n', ' ');

    for (AnnotationDesc.ElementValuePair elementValuePair : annotation.elementValues()) {
        if ("type".equals(elementValuePair.element().name())) {
            Object typeValue = elementValuePair.value().value();
            this.type = (Type) typeValue;
        }
    }
}
 

public static PSItemFieldDoc build(PSItemDoc psItemDoc, FieldDoc fieldDoc) {
    AnnotationDesc[] annotations = fieldDoc.annotations();
    for (AnnotationDesc annotation : annotations) {
        AnnotationTypeDoc annotationType = annotation.annotationType();
        if (Consts.ITEM_FIELD_ANNOTATION.equals(annotationType.toString())) {
            return new PSItemFieldDoc(psItemDoc, fieldDoc, annotation);
        }
    }
    return null;
}
 

private void getAllFieldDocs(ClassDoc classDoc, List<FieldDoc> fieldDocs) {
    if (classDoc.superclass() != null) {
        this.getAllFieldDocs(classDoc.superclass(), fieldDocs);
    }
    if (isValidPSItem(classDoc)) {
        fieldDocs.addAll(Arrays.asList(classDoc.fields()));
    }
}
 

void dump(PrintWriter out, String prefix, ClassDoc cd) {
    out.println(prefix + "class: " + cd);
    for (FieldDoc fd: cd.fields()) {
        out.println(prefix + "  " + fd);
        if (fd.type().asClassDoc() != null) {
            dump(out, prefix + "    ", fd.type().asClassDoc());
        }
    }
}
 

/** Return a list of fields for this class and all it's superclasses */
protected static List<FieldDoc> getFields(ClassDoc classDoc) {
  List<FieldDoc> ret = new ArrayList<>();
  ClassDoc parent = classDoc.superclass();
  if (parent != null) {
    ret.addAll(getFields(parent));
  }

  ret.addAll(Arrays.asList(classDoc.fields()));

  return ret;
}
 

private static List<String> createResourceItem(FieldDoc field) {
  Tag[] tags = field.tags("@" + ExternalResources.NAME);
  if (tags.length == 0) {
    return Collections.emptyList();
  }

  List<String> ret = new ArrayList<>();

  String pkg = field.containingPackage().name();
  int levels = pkg.length() - pkg.replaceAll("\\.", "").length() + 1;

  StringBuilder linkLevels = new StringBuilder("");
  for (int i = 0; i < levels; i++) {
    linkLevels.append("../");
  }

  for (Tag tag : tags) {
    ret.add(
        "<a href=\""
            + linkLevels.toString()
            + tag.text().replaceAll("\\.", "/")
            + ".html\">"
            + tag.text()
            + "</a> (key = "
            + field.constantValue()
            + ")");
  }

  return ret;
}
 

public static ClassDocumentation fromClassDoc(ClassDoc classDoc) {
    ClassDocumentation cd = new ClassDocumentation();
    cd.setComment(classDoc.commentText());
    for (FieldDoc fieldDoc : classDoc.fields(false)) {
        cd.addField(fieldDoc);
    }
    for (MethodDoc methodDoc : classDoc.methods(false)) {
        cd.addMethod(methodDoc);
    }
    return cd;
}
 

public static FieldDocumentation fromFieldDoc(FieldDoc fieldDoc) {
    FieldDocumentation fd = new FieldDocumentation();
    fd.comment = fieldDoc.commentText();

    for (Tag tag : fieldDoc.tags()) {
        fd.tags.put(cleanupTagName(tag.name()), tag.text());
    }

    return fd;
}
 

/** Wrap a field doc.
 *
 * @param source the source
 * @return the wrapper.
 */
public FieldDoc wrap(FieldDoc source) {
	if (source == null || source instanceof Proxy<?> || !(source instanceof FieldDocImpl)) {
		return source;
	}
	return new FieldDocWrapper((FieldDocImpl) source);
}
 

/** Wrap a field doc.
 *
 * @param source the source
 * @return the wrapper.
 */
public FieldDoc[] wrap(FieldDoc[] source) {
	if (source == null) {
		return null;
	}
	final List<FieldDoc> list = new ArrayList<>();
	for (final FieldDoc element : source) {
		if (isIncluded(element)) {
			list.add(wrap(element));
		}
	}
	return Utils.toArray(source, list);
}
 

/**
 * start the doclet
 * @param root the document root
 * @return boolean
 * @throws Exception e
 */
public static boolean start(RootDoc root) throws Exception {
    ClassDoc[] classes = root.classes();
    initializeExceptions();
    boolean found = false;

    for (ClassDoc clas : classes) {

        ClassDoc parent = clas.findClass("org.apache.struts.action.Action");
        if (parent == null) {
            System.out.println("Skipping " + clas.name());
            continue;
        }

        if (clas.subclassOf(parent)) {
            for (FieldDoc field : clas.fields()) {
                if (!field.isFinal() && !hasException(clas.name(), field.name())) {
                    found = true;
                    System.out.println("WARNING: Action Class " + clas.name() +
                            " has member: " + field.name());
                }
            }
        }
    }
    if (found) {
        throw new InvalidObjectException("Found non-final, non-exempt member " +
                "variables in one or more Action classes.  See Warnings " +
                "above for more information.");
    }
    return true;
}
 

protected Enum parseEnum(ClassDoc classDoc) {
	Enum enumNode = objectFactory.createEnum();
	enumNode.setName(classDoc.name());
	enumNode.setQualified(classDoc.qualifiedName());
	String comment = classDoc.commentText();
	if (comment.length() > 0) {
		enumNode.setComment(comment);
	}
	enumNode.setIncluded(classDoc.isIncluded());
	enumNode.setScope(parseScope(classDoc));

	Type superClassType = classDoc.superclassType();
	if (superClassType != null) {
		enumNode.setClazz(parseTypeInfo(superClassType));
	}

	for (Type interfaceType : classDoc.interfaceTypes()) {
		enumNode.getInterface().add(parseTypeInfo(interfaceType));
	}

	for (FieldDoc field : classDoc.enumConstants()) {
		enumNode.getConstant().add(parseEnumConstant(field));
	}

	for (AnnotationDesc annotationDesc : classDoc.annotations()) {
		enumNode.getAnnotation().add(parseAnnotationDesc(annotationDesc, classDoc.qualifiedName()));
	}

	for (Tag tag : classDoc.tags()) {
		enumNode.getTag().add(parseTag(tag));
	}

	return enumNode;
}
 

protected Interface parseInterface(ClassDoc classDoc) {

		Interface interfaceNode = objectFactory.createInterface();
		interfaceNode.setName(classDoc.name());
		interfaceNode.setQualified(classDoc.qualifiedName());
		String comment = classDoc.commentText();
		if (comment.length() > 0) {
			interfaceNode.setComment(comment);
		}
		interfaceNode.setIncluded(classDoc.isIncluded());
		interfaceNode.setScope(parseScope(classDoc));

		for (TypeVariable typeVariable : classDoc.typeParameters()) {
			interfaceNode.getGeneric().add(parseTypeParameter(typeVariable));
		}

		for (Type interfaceType : classDoc.interfaceTypes()) {
			interfaceNode.getInterface().add(parseTypeInfo(interfaceType));
		}

		for (MethodDoc method : classDoc.methods()) {
			interfaceNode.getMethod().add(parseMethod(method));
		}

		for (AnnotationDesc annotationDesc : classDoc.annotations()) {
			interfaceNode.getAnnotation().add(parseAnnotationDesc(annotationDesc, classDoc.qualifiedName()));
		}

		for (Tag tag : classDoc.tags()) {
			interfaceNode.getTag().add(parseTag(tag));
		}

		for (FieldDoc field : classDoc.fields()) {
			interfaceNode.getField().add(parseField(field));
		}

		return interfaceNode;
	}
 

@Override
   public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
     String methodName = method.getName();
     if (target instanceof Doc) {
if (methodName.equals("isIncluded")) {
  Doc doc = (Doc) target;
  return !exclude(doc) && doc.isIncluded();
}
if (target instanceof RootDoc) {
  if (methodName.equals("classes")) {
    return filter(((RootDoc) target).classes(), ClassDoc.class);
  } else if (methodName.equals("specifiedClasses")) {
    return filter(((RootDoc) target).specifiedClasses(), ClassDoc.class);
  } else if (methodName.equals("specifiedPackages")) {
    return filter(((RootDoc) target).specifiedPackages(), PackageDoc.class);
  }
} else if (target instanceof ClassDoc) {
  if (isFiltered(args)) {
    if (methodName.equals("methods")) {
      return filter(((ClassDoc) target).methods(true), MethodDoc.class);
    } else if (methodName.equals("fields")) {
      return filter(((ClassDoc) target).fields(true), FieldDoc.class);
    } else if (methodName.equals("innerClasses")) {
      return filter(((ClassDoc) target).innerClasses(true),
	  ClassDoc.class);
    } else if (methodName.equals("constructors")) {
      return filter(((ClassDoc) target).constructors(true),
	  ConstructorDoc.class);
    }
  }
} else if (target instanceof PackageDoc) {
  if (methodName.equals("allClasses")) {
    if (isFiltered(args)) {
      return filter(((PackageDoc) target).allClasses(true),
	ClassDoc.class);
    } else {
      return filter(((PackageDoc) target).allClasses(), ClassDoc.class);  
    }
  } else if (methodName.equals("annotationTypes")) {
    return filter(((PackageDoc) target).annotationTypes(),
	AnnotationTypeDoc.class);
  } else if (methodName.equals("enums")) {
    return filter(((PackageDoc) target).enums(),
	ClassDoc.class);
  } else if (methodName.equals("errors")) {
    return filter(((PackageDoc) target).errors(),
	ClassDoc.class);
  } else if (methodName.equals("exceptions")) {
    return filter(((PackageDoc) target).exceptions(),
	ClassDoc.class);
  } else if (methodName.equals("interfaces")) {
    return filter(((PackageDoc) target).interfaces(),
	ClassDoc.class);
  } else if (methodName.equals("ordinaryClasses")) {
    return filter(((PackageDoc) target).ordinaryClasses(),
	ClassDoc.class);
  }
}
     }

     if (args != null) {
if (methodName.equals("compareTo") || methodName.equals("equals")
    || methodName.equals("overrides")
    || methodName.equals("subclassOf")) {
  args[0] = unwrap(args[0]);
}
     }
     try {
return process(method.invoke(target, args), method.getReturnType());
     } catch (InvocationTargetException e) {
throw e.getTargetException();
     }
   }
 

@Override
   public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
     String methodName = method.getName();
     if (target instanceof Doc) {
if (methodName.equals("isIncluded")) {
  Doc doc = (Doc) target;
  return !exclude(doc) && doc.isIncluded();
}
if (target instanceof RootDoc) {
  if (methodName.equals("classes")) {
    return filter(((RootDoc) target).classes(), ClassDoc.class);
  } else if (methodName.equals("specifiedClasses")) {
    return filter(((RootDoc) target).specifiedClasses(), ClassDoc.class);
  } else if (methodName.equals("specifiedPackages")) {
    return filter(((RootDoc) target).specifiedPackages(), PackageDoc.class);
  }
} else if (target instanceof ClassDoc) {
  if (isFiltered(args)) {
    if (methodName.equals("methods")) {
      return filter(((ClassDoc) target).methods(true), MethodDoc.class);
    } else if (methodName.equals("fields")) {
      return filter(((ClassDoc) target).fields(true), FieldDoc.class);
    } else if (methodName.equals("innerClasses")) {
      return filter(((ClassDoc) target).innerClasses(true),
	  ClassDoc.class);
    } else if (methodName.equals("constructors")) {
      return filter(((ClassDoc) target).constructors(true),
	  ConstructorDoc.class);
    }
  }
} else if (target instanceof PackageDoc) {
  if (methodName.equals("allClasses")) {
    if (isFiltered(args)) {
      return filter(((PackageDoc) target).allClasses(true),
	ClassDoc.class);
    } else {
      return filter(((PackageDoc) target).allClasses(), ClassDoc.class);  
    }
  } else if (methodName.equals("annotationTypes")) {
    return filter(((PackageDoc) target).annotationTypes(),
	AnnotationTypeDoc.class);
  } else if (methodName.equals("enums")) {
    return filter(((PackageDoc) target).enums(),
	ClassDoc.class);
  } else if (methodName.equals("errors")) {
    return filter(((PackageDoc) target).errors(),
	ClassDoc.class);
  } else if (methodName.equals("exceptions")) {
    return filter(((PackageDoc) target).exceptions(),
	ClassDoc.class);
  } else if (methodName.equals("interfaces")) {
    return filter(((PackageDoc) target).interfaces(),
	ClassDoc.class);
  } else if (methodName.equals("ordinaryClasses")) {
    return filter(((PackageDoc) target).ordinaryClasses(),
	ClassDoc.class);
  }
}
     }

     if (args != null) {
if (methodName.equals("compareTo") || methodName.equals("equals")
    || methodName.equals("overrides")
    || methodName.equals("subclassOf")) {
  args[0] = unwrap(args[0]);
}
     }
     try {
return process(method.invoke(target, args), method.getReturnType());
     } catch (InvocationTargetException e) {
throw e.getTargetException();
     }
   }
 

private void addField(FieldDoc fieldDoc) {
    this.fields.put(fieldDoc.name(), FieldDocumentation.fromFieldDoc(fieldDoc));
}
 

/** Replies the default value of the given parameter.
 *
 * @param member the member
 * @param param the parameter.
 * @param configuration the configuration.
 * @return the default value or {@code null}.
 */
@SuppressWarnings("checkstyle:nestedifdepth")
public static String getParameterDefaultValue(ExecutableMemberDoc member, Parameter param, SarlConfiguration configuration) {
	final AnnotationDesc annotation = Utils.findFirst(param.annotations(), it ->
			qualifiedNameEquals(it.annotationType().qualifiedTypeName(), getKeywords().getDefaultValueAnnnotationName()));
	if (annotation != null) {
		final ElementValuePair[] pairs = annotation.elementValues();
		if (pairs != null && pairs.length > 0) {
			final String fieldId = pairs[0].value().value().toString();

			final int index = fieldId.indexOf('#');
			ClassDoc fieldContainer;
			final String fieldName;
			if (index > 0) {
				final String referenceName = fieldId.substring(0, index);
				if (qualifiedNameEquals(referenceName, member.containingClass().qualifiedName())) {
					fieldContainer = member.containingClass();
				} else {
					fieldContainer = findFirst(configuration.classDocCatalog.allClasses(getPackageName(referenceName)),
							false, it -> false);
					if (fieldContainer == null) {
						fieldContainer = member.containingClass();
					}
				}
				fieldName = createNameForHiddenDefaultValueAttribute(fieldId.substring(index + 1));
			} else {
				fieldContainer = member.containingClass();
				fieldName = createNameForHiddenDefaultValueAttribute(fieldId);
			}

			final FieldDoc field = Utils.findFirst(fieldContainer.fields(),
					false, it -> simpleNameEquals(it.name(), fieldName));
			if (field != null) {
				final AnnotationDesc valueAnnotation = Utils.findFirst(field.annotations(), it ->
						qualifiedNameEquals(it.annotationType().qualifiedTypeName(), getKeywords().getSarlSourceCodeAnnotationName()));
				if (valueAnnotation != null) {
					return valueAnnotation.elementValues()[0].value().value().toString();
				}
			}
		}
	}
	return null;
}
 

@Override
public FieldDoc[] enumConstants() {
	return wrap(this.delegate.enumConstants());
}
 

@Override
public FieldDoc[] fields() {
	return wrap(this.delegate.fields());
}
 

@Override
public FieldDoc[] fields(boolean arg0) {
	return wrap(this.delegate.fields(arg0));
}
 

@Override
public FieldDoc[] serializableFields() {
	return wrap(this.delegate.serializableFields());
}
 

@Override
public FieldDoc findField(String fieldName) {
	return wrap(this.delegate.findField(fieldName));
}
 

@Override
public FieldDoc[] enumConstants() {
	return wrap(this.delegate.enumConstants());
}