Chapter 7[ 157 ]NodeBuilder
NodeBuilder is used to build tree structures of node instances in memory. We use
exactly the same GroovyMarkup syntax as before. Here we build up a tree structure
in memory from customer data, using the same structure as with MarkupBuilder.
All that needs to change to construct a node-based tree in memory is to replace the
builder instance created with an instance of NodeBuilder. Once the markup code has
been executed, the customers field contains the tree structure, which can be accessed
by using Groovy's XPath-like syntax, GPath:
given:
def builder = new groovy.util.NodeBuilder()def fred = new Customer(id:1001,firstName:"Fred",
surname:"Flintstone",
street:"1 Rock Road",city:"Bedrock")
def barney = new Customer(id:1002,firstName:"Barney",
surname:"Rubble",
street:"2 Rock Road",city:"Bedrock")
def wilma = new Customer(id:1003,firstName:"Wilma",
surname:"Flintstone",
street:"1 Rock Road",city:"Bedrock")
def betty = new Customer(id:1004,firstName:"Betty", surname:"Rubble",
street:"2 Rock Road",city:"Bedrock")
def customerList = [ fred, barney,wilma,betty]when:
def customers = builder.customers {
for (cust in customerList) {
customer(id:cust.id) {
name(firstName:cust.firstName,surname:cust.surname)
address(street:cust.street, city:cust.city)
}
}
}then:
customers.customer[0].'@id' == 1001
customers.customer[1].'@id' == 1002
customers.customer[0].address[0].'@street' ==
customers.customer[2].address[0].'@street'
customers.grep{
it.name.any{it.'@surname' == "Rubble"}
}.size == 2
customers.grep{
it.name.any{it.'@surname' == "Rubble"}
}.address.every{ it.'@street'[0] == "2 Rock Road"}