本文整理汇总了Java中com.redhat.lightblue.util.Path.matchingDescendant方法的典型用法代码示例。如果您正苦于以下问题：Java Path.matchingDescendant方法的具体用法？Java Path.matchingDescendant怎么用？Java Path.matchingDescendant使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类com.redhat.lightblue.util.Path的用法示例。
在下文中一共展示了Path.matchingDescendant方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: getRequiredFields
import com.redhat.lightblue.util.Path; //导入方法依赖的package包/类
/**
* Returns all the fields required to evaluate the given projection, query,
* and sort
*
* @param md Entity metadata
* @param p Projection
* @param q Query
* @param s Sort
*
* All arguments are optional. The returned set contains the fields required
* to evaluate all the non-null expressions
*/
public static Set<Path> getRequiredFields(EntityMetadata md,
Projection p,
QueryExpression q,
Sort s) {
Set<Path> fields = new HashSet<>();
FieldCursor cursor = md.getFieldCursor();
// skipPrefix will be set to the root of a subtree that needs to be skipped.
// If it is non-null, all fields with a prefix 'skipPrefix' will be skipped.
Path skipPrefix = null;
if (cursor.next()) {
boolean done = false;
do {
Path field = cursor.getCurrentPath();
if (skipPrefix != null) {
if (!field.matchingDescendant(skipPrefix)) {
skipPrefix = null;
}
}
if (skipPrefix == null) {
FieldTreeNode node = cursor.getCurrentNode();
LOGGER.debug("Checking if {} is included ({})", field, node);
if (node instanceof ResolvedReferenceField
|| node instanceof ReferenceField) {
skipPrefix = field;
} else {
if ((node instanceof ObjectField)
|| (node instanceof ArrayField && ((ArrayField) node).getElement() instanceof ObjectArrayElement)
|| (node instanceof ArrayElement)) {
// include its member fields
} else if ((p != null && p.isFieldRequiredToEvaluateProjection(field))
|| (q != null && q.isRequired(field))
|| (s != null && s.isRequired(field))) {
LOGGER.debug("{}: required", field);
fields.add(field);
} else {
LOGGER.debug("{}: not required", field);
}
done = !cursor.next();
}
} else {
done = !cursor.next();
}
} while (!done);
}
return fields;
}