lospejos lospejos - 7 months ago 45
Groovy Question

Groovy find nodes using gpath with certian child count and expression

Suppose I have an XML:

<?xml version="1.0" encoding="UTF-8"?>
<level0 id="1" t="0">
<level1 id="lev1id01" att1="2015-05-12" val="12" status="0"/>
<level1 id="lev1id02" att1="2015-06-13" val="13" status="0"/>
<level1 id="lev1id03" att1="2015-07-10" val="13" status="0"/>

<level0 id="2" t="0">
<level1 id="lev1id11" att1="2015-05-12" val="121" status="0"/>
<level1 id="lev1id12" att1="2015-06-13" val="132" status="0"/>
<level1 id="lev1id13" att1="2015-07-11" val="113" status="0"/>

<level0 id="2" t="1">
<level1 id="lev1id21" att1="2015-05-12" val="121" status="0"/>
<level1 id="lev1id22" att1="2015-06-13" val="132" status="0"/>
<level1 id="lev1id23" att1="2015-07-11" val="113" status="0"/>
<level1 id="lev1id23" att1="2015-07-11" val="113" status="0"/>

I want to get all
nodes (using GPath) which are:

  1. If
    then select this node (level0) only if all its
    children has

  2. If
    then select this node (level0) only if the last
    child has
    . When I say last I mean the
    node with maximum value in
    contains date in

With XPath I would use functions like max() and count(), but I can't get how it could be done using GPath.



The max() and count() functions defined by Groovy on Iterable can be used within GPath expressions in place of their XPath equivalents.

// This closure is for level0[t=0] elements.
// It selects the level0 if the count of its level1[status=0] children is 0.
def t0Select = { level0 -> 
    level0.level1.count { level1 -> level1.@status != '0' } == 0 

// This closure is for level1[t=1] elements.
// It selects the level0 if its level1 element with the maximum date has a status of "0" 
def t1Select = { level0 -> 
    level0.level1.max { level1 -> Date.parse('yyyy-MM-dd', level1.@att1.toString()) }?.@status == '0' 

// Parse the XML and delegate to the appropriate closure above as per the t attribute
def selected = new XmlSlurper().parseText(xml).level0.findAll { level0 -> 
    level0.@t == '0' ? t0Select(level0) : t1Select(level0)