Store GPath expressions externally

Question

I'm using groovy to process some XML and I've read through the following tutorial http://groovy-lang.org/processing-xml.html. I understand how to replaceNodes but what I'd like to do is store these gpath expressions in a file and read them in at run time to "detect" things like urls, database connection properties and replace node values/attributes as required.

Does anyone know if this is possible?

[edit] Example as requested

def books = '''
    <response version-api="2.0">
        <value>
            <books>
                <book available="20" id="1">
                    <title>Don Xijote</title>
                    <author id="1">Manuel De Cervantes</author>
                </book>
                <book available="14" id="2">
                    <title>Catcher in the Rye</title>
                   <author id="2">JD Salinger</author>
               </book>
               <book available="13" id="3">
                   <title>Alice in Wonderland</title>
                   <author id="3">Lewis Carroll</author>
               </book>
               <book available="5" id="4">
                   <title>Don Xijote</title>
                   <author id="4">Manuel De Cervantes</author>
               </book>
           </books>
       </value>
    </response>
'''


def response = new XmlParser().parseText(books)

response.value.books.book[0].author.replaceNode{
        author(id:"99s","Harper Lee")
}


// None of the following will work, but hopefully it shows what I'd like to do
// I'd like to store the path expression as a string 
def path = "response.value.books.book[0].author"

// 
path.replaceNode{
    author(getReplacementValueFromSomeLookup(path) )    
}

Would you mind showing your sample input and desired output xml? — Rao, Nov 01 '17 at 15:49

score 2 · Accepted Answer · answered Nov 01 '17 at 16:22

very close to this question: How to get key from ArrayList nested in JSON using Groovy and change its value

def books = '''
    <response version-api="2.0">
        <value>
            <books>
                <book available="20" id="1">
                    <title>Don Xijote</title>
                    <author id="1">Manuel De Cervantes</author>
                </book>
                <book available="14" id="2">
                    <title>Catcher in the Rye</title>
                   <author id="2">JD Salinger</author>
               </book>
               <book available="13" id="3">
                   <title>Alice in Wonderland</title>
                   <author id="3">Lewis Carroll</author>
               </book>
               <book available="5" id="4">
                   <title>Don Xijote</title>
                   <author id="4">Manuel De Cervantes</author>
               </book>
           </books>
       </value>
    </response>
'''


def response = new XmlParser().parseText(books)

def path = "ROOT.value.books.book[0].author"

Eval.me('ROOT',response, path).replaceNode{
    author('DEMO')    
}

println groovy.xml.XmlUtil.serialize(response)

Thanks for this, it seems to be about the best answer from what I could see. The approach I originally suggested didn't really feel to be right way to go in the end, but thank you for your answer. What I really want is SQL for XML/JSON, the GPath/XPath just feels a little intensive. — K2J, Nov 02 '17 at 13:36

Store GPath expressions externally

1 Answers1