xslt aggregation sum - xslt

Question

I want do some sum of the values and return it as a row or column with the data.
taking the below xml as example:
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<root>
<default0>
<Group>
<groupEntry>
<Day>Mon</Day>
<ID>111</ID>
<Number>-3</Number>
</groupEntry>
</Group>
<Group>
<groupEntry>
<Day>Tue</Day>
<ID>222</ID>
<Number>4</Number>
</groupEntry>
</Group>
<Group>
<groupEntry>
<Day>Tue</Day>
<ID>444</ID>
<Number>5</Number>
</groupEntry>
<Breakdown>
<Details>
<Day>Tue</Day>
<ID>444</ID>
<Number>-3</Number>
</Details>
<Details>
<Day>Tue</Day>
<ID>444</ID>
<Number>8</Number>
</Details>
</Breakdown>
</Group>
<Group>
<groupEntry>
<Day>Fri</Day>
<ID>333</ID>
<Number>-3</Number>
</groupEntry>
</Group>
</default0>
</root>
My below xslt :
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:text>ID,Day,Number</xsl:text>
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="groupEntry|Details">
<xsl:text>
</xsl:text>
<xsl:value-of select="ID"/>
<xsl:text>,</xsl:text>
<xsl:value-of select="Day"/>
<xsl:text>,</xsl:text>
<xsl:value-of select="Number"/>
</xsl:template>
<xsl:template match="text()"/>
</xsl:stylesheet>
returns this result:
ID,Day,Number
111,Mon,-3
222,Tue,4
444,Tue,5
444,Tue,-3
444,Tue,8
333,Fri,-3
However I want to get the total number by Day and report it in the result as either of the below 2 options
create 1 summary row like:
ID,Day,Number
Mon,Mon,-3
111,Mon,-3
Tue,Tue,9
222,Tue,4
444,Tue,5
444,Tue,-3
444,Tue,8
Fri,Fri,-3
333,Fri,-3
create an extra column:
ID,Day,Number,TotalNumber
111,Mon,-3,-3
222,Tue,4,9
444,Tue,5,9
444,Tue,-3,9
444,Tue,8,9
333,Fri,-3,-3
Does anyone know if this is possible?

Answer 1

In either option, you would probably need to define a key to group the elements by Day
<xsl:key name="days" match="groupEntry|Details" use="Day"/>
Then you can just add your extra column like so
<xsl:value-of select="sum(key('days', Day)/Number)"/>
Here is the full XSLT for the first option
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:key name="days" match="groupEntry|Details" use="Day"/>
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:text>ID,Day,Number,TotalNumber</xsl:text>
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="groupEntry|Details">
<xsl:text>
</xsl:text>
<xsl:value-of select="ID"/>
<xsl:text>,</xsl:text>
<xsl:value-of select="Day"/>
<xsl:text>,</xsl:text>
<xsl:value-of select="Number"/>
<xsl:text>,</xsl:text>
<xsl:value-of select="sum(key('days', Day)/Number)"/>
</xsl:template>
<xsl:template match="text()"/>
</xsl:stylesheet>
This should output the following results
ID,Day,Number,TotalNumber
111,Mon,-3,-3
222,Tue,4,14
444,Tue,5,14
444,Tue,-3,14
444,Tue,8,14
333,Fri,-3,-3
In the second option, you would want to add a total line for the first occurrence of a particular Day. You can do this by checking if the current element is the first element in the key for that day
<xsl:if test="generate-id() = generate-id(key('days', Day)[1])">
Here is the XSLT for the second case
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:key name="days" match="groupEntry|Details" use="Day"/>
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:text>ID,Day,Number</xsl:text>
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="groupEntry|Details">
<xsl:if test="generate-id() = generate-id(key('days', Day)[1])">
<xsl:text>
</xsl:text>
<xsl:value-of select="Day"/>
<xsl:text>,</xsl:text>
<xsl:value-of select="Day"/>
<xsl:text>,</xsl:text>
<xsl:value-of select="sum(key('days', Day)/Number)"/>
</xsl:if>
<xsl:text>
</xsl:text>
<xsl:value-of select="ID"/>
<xsl:text>,</xsl:text>
<xsl:value-of select="Day"/>
<xsl:text>,</xsl:text>
<xsl:value-of select="Number"/>
</xsl:template>
<xsl:template match="text()"/>
</xsl:stylesheet>
This should output the following results
ID,Day,Number
Mon,Mon,-3
111,Mon,-3
Tue,Tue,14
222,Tue,4
444,Tue,5
444,Tue,-3
444,Tue,8
Fri,Fri,-3
333,Fri,-3