替换Groovy XML节点会在后续的findAll调用中引起问题

时间:2019-03-21 11:25:19

标签: groovy xml-parsing findall

我使用groovy使用XmlParser解析XML文件。为了避免处理名称空间前缀,我使用了xmlRoot。'**'。findAll()方法来查找一些节点。该示例代码显示了如何正确工作,直到我刚刚读取节点,因为传递给闭包的每个项目都是一个Node对象。但是,当我更改节点的内容(在这种情况下,仅是节点的文本)时,对findAll的下一次调用不会在Node对象上进行迭代。对于我在文本中输入的每个字符,将String对象传递给闭包。我用instanceof检查类型来解决它,但这似乎是一个错误。

我做错了什么还是一个错误?

 class XmlParserTest {

static final String XML_SAMPLE = """
<ns0:root xmlns:ns0="mycompany.com">
    <ns0:firstParent>
        <ns0:item1>uppercase_me!</ns0:item1>
    </ns0:firstParent>
    <ns0:secondParent>
        <ns0:item2>uppercase_me_too!/ns0:item2>
    </ns0:secondParent>
</ns0:root>
"""

    static void main(String[] args) {
        def xmlRoot = new XmlParser(false, false).parseText(XML_SAMPLE)

        //******* find item1 and capitalize its text ********
        def nds1 = xmlRoot.'**'.findAll {
            it.name().equals("ns0:item1")
        }

        Node nd1 = nds1[0]

        //This changes the text of the node, but something strange happens to the node tree
        nd1.setValue(nd1.value().toString().toUpperCase())

        //The same problem happens using replaceNode() instead of setValue()
        //Node newNode = new Node(nd1.parent(), nd1.name(), nd1.value().toString().toUpperCase())
        //nd1.replaceNode(newNode)

        //******* find item2 and capitalize its text ********
        def nds2 = xmlRoot.'**'.findAll {
            //for each character in the string "uppercase me!" a String is passed instead of Node
            //As String doesn't have a name method, an exception is raised
            it.name().equals("ns0:item2")

            //using instanceof fixes the problem, at least for this case
            it instanceof Node && it.name().equals("ns0:item2")
        }

        Node nd2 = nds2[0]
        nd2.setValue(nd2.value().toString().toUpperCase())

        assert nd1.value().toString() == nd1.value().toString().toUpperCase()
        assert nd2.value().toString() == nd2.value().toString().toUpperCase()
    }

}

1 个答案:

答案 0 :(得分:0)

我在Groovy上打开了一个问题:this is the explation on what happened