I am trying to concatenate two strings using groovy shell but it's not working
groovy.shell("def name = 'MyName'; def fname = 'firstName'; println name+fname" );
But for single string this is working
groovy.shell("def name ='MyName'; println name");
Any idea about this?
You can Use StringBuilder as below
Object value = shell.evaluate("def name= new StringBuilder('James'); def fname= new StringBuilder('abd'); println name.append(fname) ;");
Related
How can I use jsonSlurper.parseText to parse "807-000" that has dash in it with groovy ?
You are generating the below string for parsing:
[807-000]
What I think you wanted is an json array containing a string:
["807-000"]
You could generate that json yourself:
def arr2 = "[" + arr.collect({ '"' + it + '"' }).join(",") + "]"
But why reinvent the wheel, when you can do it like this:
def arr2 = groovy.json.JsonOutput.toJson(arr)
It's not entirely clear what exactly do you want to do. parseText() is waiting for json to be input. I suggest several options for parsing.
def text = jsonSlurper.parseText("""{ "key": "807-000" } """)
Or did you mean that before the dash is the key, and after it is the value? If so then you can try this:
def map = "807-000".split("-").toSpreadMap()
map.each {row ->
def parsedText = jsonSlurper.parseText("""{ "${row.key}": "${row.value}" } """)
println(parsedText)
}
output is = [807:000]
How can I use jsonSlurper.parseText to parse "807-000" that has dash
in it with groovy ?
I am not sure what the challenge actually is. Something I can think of is possibly you are having trouble using Groovy property access to retrieve the value of a key when the key has a hyphen in it. You can do that by quoting the property name:
String jsonString = '''
{"807-000":"Eight O Seven"}
'''
def slurper = new JsonSlurper()
def json = slurper.parseText(jsonString)
// quote the property name which
// contains a hyphen...
String description = json.'807-000'
assert description == 'Eight O Seven'
I am very new to Groovy and trying to figure my way out.
I am trying to write a groovy to split the lines of a file on encountering ',' and then write a if condition based on the first two characters of the line. After that I wanted to create a XML file using the different data in the file. This is how far I have reached.
def Message processData(Message message) {
//Body
def body = message.getBody(java.lang.String)as String;
def varStringWriter = new StringWriter();
def varXMLBuilder = new MarkupBuilder(varStringWriter);
String newItem ;
body.eachLine{
line -> newItem = line ;
String newItem1 = newItem.substring(0,2).trim();
String newItem2 = newItem.substring(3,11).trim();
varXMLBuilder.RECORD{
node1(newItem1);
node2(newItem2);
}
}
def xml = varStringWriter.toString();
xml="<RECORDS>"+xml+"</RECORDS>" ;
message.setBody(xml);
return message;
}
In the above code I tried to use offset but, since each of my file lines are of different length it wont work.
Please help me handle this issue.
Regards,
Nisha
Splitting on a character can be done like this:
data = 'axaratgxrgc,rxregxsergcs'
def lines = data.split(/,/)
assert lines[0] == 'axaratgxrgc'
assert lines[1] == 'rxregxsergcs'
Welcome, first of all, to groovy and Stack Overflow :)
You can use tokenize() to split a string, as shown bellow.
And yeah, don't worry about ; in groovy ;)
def Message processData(Message message) {
//Body
def body = message.getBody(java.lang.String) as String;
def varStringWriter = new StringWriter()
def varXMLBuilder = new MarkupBuilder(varStringWriter)
body.eachLine { line ->
def newItems = line.tokenize(',') // input is a list of chars that will split your string, usually better than .split()
String newItem1 = newItems.first() // looks like you want just two items
String newItem2 = newItems.last() // but you can use as an array as well newItems[0] and newItems[1]
varXMLBuilder.RECORD {
node1(newItem1)
node2(newItem2)
}
}
def xml = varStringWriter.toString()
xml="<RECORDS>${xml}</RECORDS>" // you can use ${} to add a variable inside a string
message.setBody(xml)
return message
}
I am new to Groovy and wonder following is possible?
I have a file generated automatically with datestamp, example saledata20180429
Is it possible to code this with Groovy and convert the filename to saledata-2018-04-29.txt
Simple substring calls can get that done:
def name = 'saledata20180429'
def newname = "saledata-${name[8..11]}-${name[12..13]}-${name[14..15]}.txt"
newname evaluates to 'saledata-2018-04-29.txt'
I am trying to write a method that:
Loads a template file (*.tpl) from the local file system
Parameterizes that template file with a list of supplied variables
Best attempt thus far:
String loadParameterizedTemplateByName(String templateName,
String... variables) {
InputStream inputStream =
this.class.classLoader.getResourceAsStream(templateName)
StringWriter writer = new StringWriter()
IOUtils.copy(inputStream, writer, 'UTF-8')
String templateBody = writer.toString()
def binding = variablesAsBinding(variables) // ?!?!
engine.createTemplate(templateBody).make(binding).toString()
}
So for instance say I have the following HelloEmail.tpl template file:
HelloEmail.tpl
==============
Hello ${firstName},
You are awesome! ${someGuy} even says so!
Sincerely,
${me}
Then my desired invocation of this would be:
String firstName = 'John'
String someGuy = 'Mark'
String me = '#smeeb'
String parameterizedTemplate =
loadParameterizedTemplateByName('HelloEmail.tpl', firstName, someGuy, me)
So that the final result is that parameterizedTemplate string has a value of:
println parameterizedTemplate
// Prints:
Hello John,
You are awesome! Mark even says so!
Sincerely,
#smeeb
The trick here is that the method needs to be able to use any list of supplied variables against any supplied template file!
Is this possible to accomplish via reflection? Meaning the TemplateEngine just looks as the supplied list of String variables, and substitutes them for variables of the same name (as found in the template)?
You can pass a Map like so:
import groovy.text.markup.MarkupTemplateEngine
import groovy.text.markup.TemplateConfiguration
String loadParameterizedTemplateByName(Map variables, String templateName) {
def engine = new groovy.text.SimpleTemplateEngine()
this.class.getResource(templateName).withReader { reader ->
engine.createTemplate(reader).make(variables)
}
}
def result = loadParameterizedTemplateByName('/mail.tpl', firstName:'Tim', someGuy:'StackOverflow', me:'smeeb')
assert result == 'Hello Tim,\n\nYou are awesome! StackOverflow even says so!\n\nSincerely,\nsmeeb'
I am wondering if I can pass variable to be evaluated as String inside gstring evaluation.
simplest example will be some thing like
def var ='person.lName'
def value = "${var}"
println(value)
I am looking to get output the value of lastName in the person instance. As a last resort I can use reflection, but wondering there should be some thing simpler in groovy, that I am not aware of.
Can you try:
def var = Eval.me( 'new Date()' )
In place of the first line in your example.
The Eval class is documented here
edit
I am guessing (from your updated question) that you have a person variable, and then people are passing in a String like person.lName , and you want to return the lName property of that class?
Can you try something like this using GroovyShell?
// Assuming we have a Person class
class Person {
String fName
String lName
}
// And a variable 'person' stored in the binding of the script
person = new Person( fName:'tim', lName:'yates' )
// And given a command string to execute
def commandString = 'person.lName'
GroovyShell shell = new GroovyShell( binding )
def result = shell.evaluate( commandString )
Or this, using direct string parsing and property access
// Assuming we have a Person class
class Person {
String fName
String lName
}
// And a variable 'person' stored in the binding of the script
person = new Person( fName:'tim', lName:'yates' )
// And given a command string to execute
def commandString = 'person.lName'
// Split the command string into a list based on '.', and inject starting with null
def result = commandString.split( /\./ ).inject( null ) { curr, prop ->
// if curr is null, then return the property from the binding
// Otherwise try to get the given property from the curr object
curr?."$prop" ?: binding[ prop ]
}