XSLT條件在foreach中只發生一次

Question

 Source Xml : 
    <Lot> 
      <LotDetails> 
       <GCode>Ship</GCode> 
       <ProductQuantity>2</ProductQuantity> 
      </LotDetails 
      <LotDetails> 
       <GCode>Reject</GCode> 
       <ProductQuantity>4</ProductQuantity> 
      </LotDetails> 
      <LotDetails> 
       <GCode>Gross</GCode> 
       <ProductQuantity>3</ProductQuantity> 
      </LotDetails> 
      <LotDetails> 
       <GCode>Acceptable</GCode> 
       <ProductQuantity>5</ProductQuantity> 
      </LotDetails> 
     </Lot> 
     <Lot> 

     <LotDetails> 
       <GCode>Ship</GCode> 
       <ProductQuantity>2</ProductQuantity> 
      </LotDetails 
      <LotDetails> 
       <GCode>Reject</GCode> 
       <ProductQuantity>4</ProductQuantity> 
      </LotDetails> 
      <LotDetails> 
       <GCode>Gross</GCode> 
       <ProductQuantity>3</ProductQuantity> 
      </LotDetails> 
      <LotDetails> 
       <GCode>Acceptable1</GCode> 
       <ProductQuantity>5</ProductQuantity> 
      </LotDetails> 
     </Lot> 

     <LotDetails> 
       <GCode>Ship1</GCode> 
       <ProductQuantity>2</ProductQuantity> 
      </LotDetails 
      <LotDetails> 
       <GCode>Reject</GCode> 
       <ProductQuantity>4</ProductQuantity> 
      </LotDetails> 
      <LotDetails> 
       <GCode>Gross</GCode> 
       <ProductQuantity>3</ProductQuantity> 
      </LotDetails> 
      <LotDetails> 
       <GCode>Acceptable1</GCode> 
       <ProductQuantity>5</ProductQuantity> 
      </LotDetails> 
     </Lot> 
     TargetXml Field : 

    <Lot><LotQty>5</LotQty></Lot> 
    <Lot> <LotQty>2</LotQty></Lot> 
    <Lot><LotQty>3</LotQty> </Lot> 

     Here the condition to check to map the target field is : 

      If LotDetails/GCode = "Acceptable" and the corresponding ProductQuantity not (null and zero) 

      <LotQty> --> 5 [taken from the corresponding ProductQuantity ] 

      else if LotDetails/GCode = "Ship" and the corresponding ProductQuantity not (null and zero) 

      <LotQty> --> 2 

      else if LotDetails/GCode = "Gross" and the corresponding ProductQuantity not (null and zero) 

      <LotQty> --> 3 

      else 

      <LotQty> --> 0 

     Here the LotQty should happen only once for a particular iteration of <Lot> based on any of the conditions 
     if any first condition is satisfied then the map LotQTY from the corresponding ProductQuantity ? 
When we use for each LotDetails- we get the qty correctly but it produces multiple results for LotQTY inside each loop as below 
<Lot> 
     <LotQty>5</LotQty> 
     <LotQty>2</LotQty> 
     <LotQty>3</LotQty> 
</Lot> 

    <Lot>  
     <LotQty>2</LotQty> 
     <LotQty>3</LotQty> 
</Lot> 
    <Lot> 
     <LotQty>3</LotQty> 
</Lot> 

When i only use IF conditions with out for each the qty is always selected from the first matched condition 
<Lot><LotQty>5</LotQty></Lot> 
<Lot> <LotQty>5</LotQty></Lot> 
    <Lot><LotQty>5</LotQty> </Lot 


What i need is as below is only one lotQty for each lot based on first satisfied condition with the corresponding qty 


    <Lot><LotQty>5</LotQty></Lot> 
    <Lot><LotQty>2</LotQty></Lot> 
    <Lot><LotQty>3</LotQty></Lot> 

Not sure on the template mach usage a being a beginner on xslt usage 

如何根據相應的LotDetails/GCode獲取正確的LotDetails/ProductQuantity，並且不使用每個LotDetails/GCode？ 任何可以從if動態傳遞滿足條件的方法，並使用LotDetails選擇正確的ProductQuantity或從當前節點中選擇ProductQuantity？

Please let know xslt experts on the best way to do this ? 

Answer 1

考慮下面的例子：

XML

<Lots> 
    <Lot> 
     <LotDetails> 
      <GCode>Ship</GCode> 
      <ProductQuantity>2</ProductQuantity> 
     </LotDetails> 
     <LotDetails> 
      <GCode>Reject</GCode> 
      <ProductQuantity>4</ProductQuantity> 
     </LotDetails> 
     <LotDetails> 
      <GCode>Gross</GCode> 
      <ProductQuantity>3</ProductQuantity> 
     </LotDetails> 
     <LotDetails> 
      <GCode>Acceptable</GCode> 
      <ProductQuantity>5</ProductQuantity> 
     </LotDetails> 
    </Lot> 
    <Lot> 
     <LotDetails> 
      <GCode>Ship</GCode> 
      <ProductQuantity>2</ProductQuantity> 
     </LotDetails> 
     <LotDetails> 
      <GCode>Reject</GCode> 
      <ProductQuantity>4</ProductQuantity> 
     </LotDetails> 
     <LotDetails> 
      <GCode>Gross</GCode> 
      <ProductQuantity>3</ProductQuantity> 
     </LotDetails> 
     <LotDetails> 
      <GCode>Acceptable</GCode> 
     </LotDetails> 
    </Lot> 
    <Lot> 
     <LotDetails> 
      <GCode>Ship</GCode> 
     </LotDetails> 
     <LotDetails> 
      <GCode>Reject</GCode> 
      <ProductQuantity>4</ProductQuantity> 
     </LotDetails> 
     <LotDetails> 
      <GCode>Gross</GCode> 
      <ProductQuantity>3</ProductQuantity> 
     </LotDetails> 
     <LotDetails> 
      <GCode>Acceptable</GCode> 
      <ProductQuantity>0</ProductQuantity> 
     </LotDetails> 
    </Lot> 
</Lots> 

XSLT 1.0

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> 
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/> 
<xsl:strip-space elements="*"/> 

<xsl:template match="/Lots"> 
    <xsl:copy> 
     <xsl:for-each select="Lot"> 
      <xsl:copy> 
       <Quantity> 
        <xsl:choose> 
         <xsl:when test="LotDetails[GCode='Acceptable' and ProductQuantity > 0]"> 
          <xsl:value-of select="LotDetails[GCode='Acceptable']/ProductQuantity"/> 
         </xsl:when> 
         <xsl:when test="LotDetails[GCode='Ship' and ProductQuantity > 0]"> 
          <xsl:value-of select="LotDetails[GCode='Ship']/ProductQuantity"/> 
         </xsl:when> 
         <xsl:when test="LotDetails[GCode='Gross' and ProductQuantity >0]"> 
          <xsl:value-of select="LotDetails[GCode='Gross']/ProductQuantity"/> 
         </xsl:when> 
         <xsl:otherwise>0</xsl:otherwise> 
        </xsl:choose> 
       </Quantity> 
      </xsl:copy> 
     </xsl:for-each> 
    </xsl:copy> 
</xsl:template> 

</xsl:stylesheet> 

結果

<?xml version="1.0" encoding="UTF-8"?> 
<Lots> 
    <Lot> 
    <Quantity>5</Quantity> 
    </Lot> 
    <Lot> 
    <Quantity>2</Quantity> 
    </Lot> 
    <Lot> 
    <Quantity>3</Quantity> 
    </Lot> 
</Lots>