| package org.apache.xpath.objects; |
| |
| import org.apache.xml.dtm.DTM; |
| import org.apache.xml.dtm.DTMIterator; |
| import org.apache.xml.dtm.DTMFilter; |
| |
| import org.apache.xml.utils.XMLString; |
| |
| import org.apache.xpath.DOMHelper; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.Expression; |
| import org.apache.xalan.res.XSLMessages; |
| import org.apache.xpath.res.XPATHErrorResources; |
| |
| /** |
| * This class makes an select statement act like an result tree fragment. |
| */ |
| public class XRTreeFragSelectWrapper extends XRTreeFrag implements Cloneable |
| { |
| XObject m_selected; |
| |
| public XRTreeFragSelectWrapper(Expression expr) |
| { |
| super(expr); |
| } |
| |
| /** |
| * This function is used to fixup variables from QNames to stack frame |
| * indexes at stylesheet build time. |
| * @param vars List of QNames that correspond to variables. This list |
| * should be searched backwards for the first qualified name that |
| * corresponds to the variable reference qname. The position of the |
| * QName in the vector from the start of the vector will be its position |
| * in the stack frame (but variables above the globalsTop value will need |
| * to be offset to the current stack frame). |
| */ |
| public void fixupVariables(java.util.Vector vars, int globalsSize) |
| { |
| ((Expression)m_obj).fixupVariables(vars, globalsSize); |
| } |
| |
| /** |
| * For support of literal objects in xpaths. |
| * |
| * @param xctxt The XPath execution context. |
| * |
| * @return This object. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public XObject execute(XPathContext xctxt) |
| throws javax.xml.transform.TransformerException |
| { |
| try |
| { |
| m_selected = ((Expression)m_obj).execute(xctxt); |
| m_selected.allowDetachToRelease(m_allowRelease); |
| XRTreeFragSelectWrapper xrtf = (XRTreeFragSelectWrapper)this.clone(); |
| return xrtf; |
| } |
| catch(CloneNotSupportedException cnse) |
| { |
| throw new javax.xml.transform.TransformerException(cnse); |
| } |
| |
| } |
| |
| /** |
| * Detaches the <code>DTMIterator</code> from the set which it iterated |
| * over, releasing any computational resources and placing the iterator |
| * in the INVALID state. After <code>detach</code> has been invoked, |
| * calls to <code>nextNode</code> or <code>previousNode</code> will |
| * raise a runtime exception. |
| * |
| * In general, detach should only be called once on the object. |
| */ |
| public void detach() |
| { |
| if(m_allowRelease) |
| { |
| m_selected.detach(); |
| m_selected = null; |
| } |
| |
| super.detach(); |
| } |
| |
| /** |
| * Cast result object to a number. |
| * |
| * @return The result tree fragment as a number or NaN |
| */ |
| public double num() |
| throws javax.xml.transform.TransformerException |
| { |
| |
| return m_selected.num(); |
| } |
| |
| |
| /** |
| * Cast result object to an XMLString. |
| * |
| * @return The document fragment node data or the empty string. |
| */ |
| public XMLString xstr() |
| { |
| return m_selected.xstr(); |
| } |
| |
| /** |
| * Cast result object to a string. |
| * |
| * @return The document fragment node data or the empty string. |
| */ |
| public String str() |
| { |
| return m_selected.str(); |
| } |
| |
| /** |
| * Tell what kind of class this is. |
| * |
| * @return type CLASS_RTREEFRAG |
| */ |
| public int getType() |
| { |
| return CLASS_STRING; // hmm... |
| } |
| |
| /** |
| * Cast result object to a result tree fragment. |
| * |
| * @return The document fragment this wraps |
| */ |
| public int rtf() |
| { |
| throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_RTF_NOT_SUPPORTED_XRTREEFRAGSELECTWRAPPER, null)); //"rtf() not supported by XRTreeFragSelectWrapper!"); |
| } |
| |
| /** |
| * Cast result object to a DTMIterator. |
| * |
| * @return The document fragment as a DTMIterator |
| */ |
| public DTMIterator asNodeIterator() |
| { |
| throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_RTF_NOT_SUPPORTED_XRTREEFRAGSELECTWRAPPER, null)); //"asNodeIterator() not supported by XRTreeFragSelectWrapper!"); |
| } |
| |
| } |