本文整理了Java中net.sourceforge.pmd.lang.ast.Node.getFirstDescendantOfType()方法的一些代码示例，展示了Node.getFirstDescendantOfType()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Node.getFirstDescendantOfType()方法的具体详情如下：
包路径：net.sourceforge.pmd.lang.ast.Node
类名称：Node
方法名：getFirstDescendantOfType

Node.getFirstDescendantOfType介绍

[英]Traverses down the tree to find the first descendant instance of type descendantType without crossing find boundaries.
[中]沿树向下遍历，以查找类型为genderantType的第一个子实例，而不跨越查找边界。

代码示例

代码示例来源：origin: pmd/pmd

private boolean isAdditive(Node n) {
  ASTAdditiveExpression add = n.getFirstDescendantOfType(ASTAdditiveExpression.class);
  // if the first descendant additive expression is deeper than 4 levels,
  // it belongs to a nested method call and not anymore to the append
  // argument.
  return add != null && add.getNthParent(4) == n;
}

代码示例来源：origin: pmd/pmd

private int processAdditive(Node sn) {
  ASTAdditiveExpression additive = sn.getFirstDescendantOfType(ASTAdditiveExpression.class);
  if (additive == null) {
    return 0;
  }
  int anticipatedLength = 0;
  for (int ix = 0; ix < additive.jjtGetNumChildren(); ix++) {
    Node childNode = additive.jjtGetChild(ix);
    ASTLiteral literal = childNode.getFirstDescendantOfType(ASTLiteral.class);
    if (literal != null && literal.getImage() != null) {
      anticipatedLength += literal.getImage().length() - 2;
    }
  }
  return anticipatedLength;
}

代码示例来源：origin: pmd/pmd

private String getExpressionVarName(Node e) {
  String assignedVar = getFirstNameImage(e);
  if (assignedVar == null) {
    ASTPrimarySuffix suffix = e.getFirstDescendantOfType(ASTPrimarySuffix.class);
    if (suffix != null) {
      assignedVar = suffix.getImage();
      ASTPrimaryPrefix prefix = e.getFirstDescendantOfType(ASTPrimaryPrefix.class);
      if (prefix != null) {
        if (prefix.usesThisModifier()) {
          assignedVar = "this." + assignedVar;
        } else if (prefix.usesSuperModifier()) {
          assignedVar = "super." + assignedVar;
        }
      }
    }
  }
  return assignedVar;
}

代码示例来源：origin: pmd/pmd

private void recursivelyEvaluateCRUDMethodCalls(final AbstractApexNode<?> self,
    final Set<ASTMethodCallExpression> innerMethodCalls, final ASTBlockStatement blockStatement) {
  if (blockStatement != null) {
    int numberOfStatements = blockStatement.jjtGetNumChildren();
    for (int i = 0; i < numberOfStatements; i++) {
      Node n = blockStatement.jjtGetChild(i);
      if (n instanceof ASTIfElseBlockStatement) {
        List<ASTBlockStatement> innerBlocks = n.findDescendantsOfType(ASTBlockStatement.class);
        for (ASTBlockStatement innerBlock : innerBlocks) {
          recursivelyEvaluateCRUDMethodCalls(self, innerMethodCalls, innerBlock);
        }
      }
      AbstractApexNode<?> match = n.getFirstDescendantOfType(self.getClass());
      if (Objects.equal(match, self)) {
        break;
      }
      ASTMethodCallExpression methodCall = n.getFirstDescendantOfType(ASTMethodCallExpression.class);
      if (methodCall != null) {
        mapCallToMethodDecl(self, innerMethodCalls, Arrays.asList(methodCall));
      }
    }
  }
}

代码示例来源：origin: pmd/pmd

/**
 * Gets the image of the ASTName node found by
 * {@link Node#getFirstDescendantOfType(Class)} if it is the greatgrandchild
 * of the given node.
 *
 * E.g.
 * 
 * <pre>
 * n = Expression || StatementExpression
 *       PrimaryExpression
 *         PrimaryPrefix
 *           Name
 * </pre>
 *
 * @param n
 *            the node to search
 * @return the image of the first ASTName or <code>null</code>
 */
protected String getFirstNameImage(Node n) {
  ASTName name = n.getFirstDescendantOfType(ASTName.class);
  if (name != null && name.getNthParent(3) == n) {
    return name.getImage();
  }
  return null;
}

代码示例来源：origin: pmd/pmd

/**
 * Determines the log level, that is used. It is either the called method name
 * itself or - in case java util logging is used, then it is the first argument of
 * the method call (if it exists).
 *
 * @param node the method call
 * @param methodCallName the called method name previously determined
 * @return the log level or <code>null</code> if it could not be determined
 */
private String getLogLevelName(Node node, String methodCallName) {
  if (!JAVA_UTIL_LOG_METHOD.equals(methodCallName) && !JAVA_UTIL_LOG_GUARD_METHOD.equals(methodCallName)) {
    return methodCallName;
  }
  String logLevel = null;
  ASTPrimarySuffix suffix = node.getFirstDescendantOfType(ASTPrimarySuffix.class);
  if (suffix != null) {
    ASTArgumentList argumentList = suffix.getFirstDescendantOfType(ASTArgumentList.class);
    if (argumentList != null && argumentList.jjtGetNumChildren() > 0) {
      // at least one argument - the log level. If the method call is "log", then a message might follow
      ASTName name = GuardLogStatementRule.<ASTName>getFirstChild(argumentList.jjtGetChild(0),
          ASTPrimaryExpression.class, ASTPrimaryPrefix.class, ASTName.class);
      String lastPart = getLastPartOfName(name);
      lastPart = lastPart.toLowerCase(Locale.ROOT);
      if (!lastPart.isEmpty()) {
        logLevel = lastPart;
      }
    }
  }
  return logLevel;
}

代码示例来源：origin: pmd/pmd

private Entry<VariableNameDeclaration, List<NameOccurrence>> getIterableDeclOfIteratorLoop(VariableNameDeclaration indexDecl, Scope scope) {
  Node initializer = indexDecl.getNode().getFirstParentOfType(ASTVariableDeclarator.class)
                .getFirstChildOfType(ASTVariableInitializer.class);
  if (initializer == null) {
    return null;
  }
  ASTName nameNode = initializer.getFirstDescendantOfType(ASTName.class);
  if (nameNode == null) {
    // TODO : This can happen if we are calling a local / statically imported method that returns the iterable - currently unhandled
    return null;
  }
  String name = nameNode.getImage();
  int dotIndex = name.indexOf('.');
  if (dotIndex > 0) {
    name = name.substring(0, dotIndex);
  }
  return findDeclaration(name, scope);
}

代码示例来源：origin: pmd/pmd

/**
 * Gets a list of NameDeclarations for all the fields that have type
 * ExpectedException and have a Rule annotation.
 *
 * @param classScope
 *            The class scope to search for
 * @return See description
 */
private Map<String, List<NameOccurrence>> getRuleAnnotatedExpectedExceptions(Scope classScope) {
  Map<String, List<NameOccurrence>> result = new HashMap<>();
  Map<NameDeclaration, List<NameOccurrence>> decls = classScope.getDeclarations();
  for (Map.Entry<NameDeclaration, List<NameOccurrence>> entry : decls.entrySet()) {
    Node parent = entry.getKey().getNode().jjtGetParent().jjtGetParent().jjtGetParent();
    if (parent.hasDescendantOfType(ASTMarkerAnnotation.class)
        && parent.getFirstChildOfType(ASTFieldDeclaration.class) != null) {
      String annot = parent.getFirstDescendantOfType(ASTMarkerAnnotation.class).jjtGetChild(0).getImage();
      if (!"Rule".equals(annot) && !"org.junit.Rule".equals(annot)) {
        continue;
      }
      Node type = parent.getFirstDescendantOfType(ASTReferenceType.class);
      if (!"ExpectedException".equals(type.jjtGetChild(0).getImage())) {
        continue;
      }
      result.put(entry.getKey().getName(), entry.getValue());
    }
  }
  return result;
}

代码示例来源：origin: pmd/pmd

private Object process(Node node, Object data) {
    ASTClassOrInterfaceType cit = node.getFirstDescendantOfType(ASTClassOrInterfaceType.class);
    if (cit == null || !implClassNames.contains(cit.getImage())) {
      return data;
    }
    cit = cit.getFirstDescendantOfType(ASTClassOrInterfaceType.class);
    if (cit == null) {
      return data;
    }
    ASTVariableDeclaratorId decl = node.getFirstDescendantOfType(ASTVariableDeclaratorId.class);
    List<NameOccurrence> usages = decl.getUsages();
    for (NameOccurrence no : usages) {
      ASTName name = (ASTName) no.getLocation();
      Node n = name.jjtGetParent().jjtGetParent().jjtGetParent();
      if (n instanceof ASTCastExpression) {
        addViolation(data, n);
      }
    }
    return null;
  }
}

代码示例来源：origin: pmd/pmd

@Override
public Object visit(ASTClassOrInterfaceBodyDeclaration node, Object data) {
  boolean inAnnotation = false;
  for (int i = 0; i < node.jjtGetNumChildren(); i++) {
    Node child = node.jjtGetChild(i);
    if (child instanceof ASTAnnotation) {
      ASTName annotationName = child.getFirstDescendantOfType(ASTName.class);
      if ("Test".equals(annotationName.getImage())) {
        inAnnotation = true;
        continue;
      }
    }
    if (child instanceof ASTMethodDeclaration) {
      boolean isJUnitMethod = isJUnitMethod((ASTMethodDeclaration) child, data);
      if (inAnnotation || isJUnitMethod) {
        List<Node> found = new ArrayList<>();
        found.addAll((List<Node>) visit((ASTMethodDeclaration) child, data));
        for (Node name : found) {
          addViolation(data, name);
        }
      }
    }
    inAnnotation = false;
  }
  return super.visit(node, data);
}

代码示例来源：origin: pmd/pmd

private List<VariableAccess> markUsages(DataFlowNode inode) {
  // undefinitions was once a field... seems like it works fine as a local
  List<VariableAccess> undefinitions = new ArrayList<>();
  Set<Map<NameDeclaration, List<NameOccurrence>>> variableDeclarations = collectDeclarations(inode);
  for (Map<NameDeclaration, List<NameOccurrence>> declarations : variableDeclarations) {
    for (Map.Entry<NameDeclaration, List<NameOccurrence>> entry : declarations.entrySet()) {
      NameDeclaration vnd = entry.getKey();
      if (vnd.getNode().jjtGetParent() instanceof ASTFormalParameter) {
        // no definition/undefinition/references for parameters
        continue;
      } else if (vnd.getNode().jjtGetParent()
          .getFirstDescendantOfType(ASTVariableOrConstantInitializer.class) != null) {
        // add definition for initialized variables
        addVariableAccess(vnd.getNode(), new VariableAccess(VariableAccess.DEFINITION, vnd.getImage()),
            inode.getFlow());
      }
      undefinitions.add(new VariableAccess(VariableAccess.UNDEFINITION, vnd.getImage()));
      for (NameOccurrence occurrence : entry.getValue()) {
        addAccess(occurrence, inode);
      }
    }
  }
  return undefinitions;
}

代码示例来源：origin: pmd/pmd

private int getConstructorAppendsLength(final Node node) {
  final Node parent = node.getFirstParentOfType(ASTVariableDeclarator.class);
  int size = 0;
  if (parent != null) {
    final Node initializer = parent.getFirstChildOfType(ASTVariableInitializer.class);
    if (initializer != null) {
      final Node primExp = initializer.getFirstDescendantOfType(ASTPrimaryExpression.class);
      if (primExp != null) {
        for (int i = 0; i < primExp.jjtGetNumChildren(); i++) {
          final Node sn = primExp.jjtGetChild(i);
          if (!(sn instanceof ASTPrimarySuffix) || sn.getImage() != null) {
            continue;
          }
          size += processNode(sn);
        }
      }
    }
  }
  return size;
}

代码示例来源：origin: pmd/pmd

private int processNode(Node sn) {
  int anticipatedLength = 0;
  if (sn != null) {
    ASTPrimaryPrefix xn = sn.getFirstDescendantOfType(ASTPrimaryPrefix.class);
    if (xn != null) {
      if (xn.jjtGetNumChildren() != 0 && xn.jjtGetChild(0) instanceof ASTLiteral) {

代码示例来源：origin: pmd/pmd

@Override
public Object visit(ASTAllocationExpression node, Object data) {
  ASTClassOrInterfaceType declClassName = node.getFirstChildOfType(ASTClassOrInterfaceType.class);
  if (declClassName != null && TypeHelper.isA(declClassName, javax.crypto.spec.IvParameterSpec.class)) {
    Node firstArgument = null;
    ASTArguments arguments = node.getFirstChildOfType(ASTArguments.class);
    if (arguments.getArgumentCount() > 0) {
      firstArgument = arguments.getFirstChildOfType(ASTArgumentList.class).jjtGetChild(0);
    }
    if (firstArgument != null) {
      ASTPrimaryPrefix prefix = firstArgument.getFirstDescendantOfType(ASTPrimaryPrefix.class);
      validateProperIv(data, prefix);
    }
  }
  return data;
}

代码示例来源：origin: pmd/pmd

@Override
public Object visit(ASTAllocationExpression node, Object data) {
  ASTClassOrInterfaceType declClassName = node.getFirstChildOfType(ASTClassOrInterfaceType.class);
  if (declClassName != null && TypeHelper.isA(declClassName, SECRET_KEY_SPEC)) {
    Node firstArgument = null;
    ASTArguments arguments = node.getFirstChildOfType(ASTArguments.class);
    if (arguments.getArgumentCount() > 0) {
      firstArgument = arguments.getFirstChildOfType(ASTArgumentList.class).jjtGetChild(0);
    }
    if (firstArgument != null) {
      ASTPrimaryPrefix prefix = firstArgument.getFirstDescendantOfType(ASTPrimaryPrefix.class);
      validateProperKeyArgument(data, prefix);
    }
  }
  return data;
}

代码示例来源：origin: pmd/pmd

/**
 * Determine if the constructor contains (or ends with) a String Literal
 *
 * @param node
 * @return 1 if the constructor contains string argument, else 0
 */
private int checkConstructor(ASTVariableDeclaratorId node, Object data) {
  Node parent = node.jjtGetParent();
  if (parent.jjtGetNumChildren() >= 2) {
    ASTAllocationExpression allocationExpression = parent.jjtGetChild(1)
        .getFirstDescendantOfType(ASTAllocationExpression.class);
    ASTArgumentList list = null;
    if (allocationExpression != null) {
      list = allocationExpression.getFirstDescendantOfType(ASTArgumentList.class);
    }
    if (list != null) {
      ASTLiteral literal = list.getFirstDescendantOfType(ASTLiteral.class);
      if (!isAdditive(list) && literal != null && literal.isStringLiteral()) {
        return 1;
      }
      return processAdditive(data, 0, list, node);
    }
  }
  return 0;
}

代码示例来源：origin: pmd/pmd

/**
 * Gets the name of the variable returned. Some examples: <br>
 * for this.foo returns foo <br>
 * for foo returns foo <br>
 * for foo.bar returns foo.bar
 *
 * @param ret
 *            a return statement to evaluate
 * @return the name of the variable associated or <code>null</code> if it
 *         cannot be detected
 */
protected final String getReturnedVariableName(ASTReturnStatement ret) {
  if (hasTernaryCondition(ret) && hasTernaryNullCheck(ret)) {
    return ret.getFirstDescendantOfType(ASTConditionalExpression.class).jjtGetChild(0)
        .getFirstDescendantOfType(ASTName.class).getImage();
  }
  final ASTName n = ret.getFirstDescendantOfType(ASTName.class);
  if (n != null) {
    return n.getImage();
  }
  final ASTPrimarySuffix ps = ret.getFirstDescendantOfType(ASTPrimarySuffix.class);
  if (ps != null) {
    return ps.getImage();
  }
  return null;
}

代码示例来源：origin: pmd/pmd

for (int a = 0; a < argumentList.jjtGetNumChildren(); a++) {
  Node expression = argumentList.jjtGetChild(a);
  ASTPrimaryPrefix arg = expression.getFirstDescendantOfType(ASTPrimaryPrefix.class);
  String type = "<unknown>";
  if (arg != null && arg.jjtGetNumChildren() > 0) {

代码示例来源：origin: pmd/pmd

private int processAdditive(Object data, int concurrentCount, Node sn, Node rootNode) {
  ASTAdditiveExpression additive = sn.getFirstDescendantOfType(ASTAdditiveExpression.class);

代码示例来源：origin: pmd/pmd

ASTArgumentList args = parent.getFirstDescendantOfType(ASTArgumentList.class);
if (args != null) {
  ASTName arg = args.getFirstDescendantOfType(ASTName.class);
    if (declaration != null) {
      ASTType argType = declaration.getNode().jjtGetParent().jjtGetParent()
          .getFirstDescendantOfType(ASTType.class);
      if (argType != null && argType.jjtGetChild(0) instanceof ASTReferenceType
          && ((ASTReferenceType) argType.jjtGetChild(0)).isArray()) {