Parsing xml file at build time and modify its values/content

Question

I want to parse a xml file during build time in build.gradle file and want to modify some values of xml, i follow this SO question and answer Load, modify, and write an XML document in Groovy but not able to get any change in my xml file. can anyone help me out. Thanks

code in build.gradle :

def overrideLocalyticsValues(String token) {
def xmlFile = "/path_to_file_saved_in_values/file.xml"
def locXml = new XmlParser().parse(xmlFile)

locXml.resources[0].each {
    it.@ll_app_key = "ll_app_key"
    it.value = "123456"
}
XmlNodePrinter nodePrinter = new XmlNodePrinter(new PrintWriter(new FileWriter(xmlFile)))
nodePrinter.preserveWhitespace = true
nodePrinter.print(locXml)
}

xml file :

<resources>
<string name="ll_app_key" translatable="false">MY_APP_KEY</string>
<string name="ll_gcm_sender_id" translatable="false">MY_GCM_SENDER_ID</string>
</resources>

Bhanuchander Udhayakumar · Accepted Answer · 2018-03-21T09:31:39.513

5

In your code : Is it right ...? Where is node name and attribute ..?

locXml.resources[0].each {    // Wrongly entered without node name 
    it.@ll_app_key = "ll_app_key"   // Attribute name @name
    it.value = "123456"           // you can't change or load values here
}

You tried to read and write a same file. Try this code which replaces the exact node of the xml file. XmlSlurper provides this facility.

Updated :

import groovy.util.XmlSlurper
import groovy.xml.XmlUtil

def xmlFile = "test.xml"
def locXml = new XmlSlurper().parse(xmlFile)


locXml.'**'.findAll{ if (it.name() == 'string' && it.@name == "ll_app_key") it.replaceBody 12345 }

new File (xmlFile).text = XmlUtil.serialize(locXml)

edited Mar 21 '18 at 09:31

answered Mar 21 '18 at 08:15

Bhanuchander Udhayakumar

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Getting this error regarding XmlUtil: Error:groovy.lang.MissingPropertyException: Could not find property 'XmlUtil' on project ':app'. – Kapil Rajput Mar 21 '18 at 08:37
@KapilRajput you don't need XmlUtil you can remove it. check with my updated ans. – Bhanuchander Udhayakumar Mar 21 '18 at 08:56
thanks i can see the changes in gradle console but can you please suggest me how to override these changes in actual file saved in values folder – Kapil Rajput Mar 21 '18 at 09:03
@KapilRajput Can you `import groovy.xml.StreamingMarkupBuilder` ..? if can't, you need to have `grooovy-xml` jar. – Bhanuchander Udhayakumar Mar 21 '18 at 09:09
`def writer = new FileWriter(xmlFile) XmlUtil.serialize(locXml,writer)` works please edit your answer may helps someone also – Kapil Rajput Mar 21 '18 at 09:22
@KapilRajput You said `XmlUtil ` not working ... right? If it does you can use one line code to modify file as per my updated answer ... – Bhanuchander Udhayakumar Mar 21 '18 at 09:31
it works by importing `import groovy.xml.*` in gradle file – Kapil Rajput Mar 21 '18 at 10:13

score 0 · Answer 2 · answered Mar 21 '18 at 09:30

Groovy has a better method for this than basic replacement like you're trying to do - the SimpleTemplateEngine

static void main(String[] args) {
    def templateEngine = new SimpleTemplateEngine()
    def template = '<someXml>${someValue}</someXml>'
    def templateArgs = [someValue: "Hello world!"]
    println templateEngine.createTemplate(template).make(templateArgs).toString()
}

Output:

<someXml>Hello world!</someXml>

Parsing xml file at build time and modify its values/content

2 Answers2