import com.sun.org.apache.xerces.internal.impl.xpath.XPathException; //导入依赖的package包/类
/** Constructs a field XPath expression. */
public XPath(String xpath,
             SymbolTable symbolTable,
             NamespaceContext context) throws XPathException {
    // NOTE: We have to prefix the field XPath with "./" in
    //       order to handle selectors such as "@attr" that
    //       select the attribute because the fields could be
    //       relative to the selector element. -Ac
    //       Unless xpath starts with a descendant node -Achille Fokoue
    //      ... or a / or a . - NG
    super(((xpath.trim().startsWith("/") ||xpath.trim().startsWith("."))?
            xpath:"./"+xpath),
          symbolTable, context);

    // verify that only one attribute is selected per branch
    for (int i=0;i<fLocationPaths.length;i++) {
        for(int j=0; j<fLocationPaths[i].steps.length; j++) {
            com.sun.org.apache.xerces.internal.impl.xpath.XPath.Axis axis =
                fLocationPaths[i].steps[j].axis;
            if (axis.type == XPath.Axis.ATTRIBUTE &&
                    (j < fLocationPaths[i].steps.length-1)) {
                throw new XPathException("c-fields-xpaths");
            }
        }
    }
}
 

import com.sun.org.apache.xerces.internal.impl.xpath.XPathException; //导入依赖的package包/类
/** Constructs a field XPath expression. */
public XPath(String xpath,
             SymbolTable symbolTable,
             NamespaceContext context) throws XPathException {
    super(fixupXPath(xpath), symbolTable, context);

    // verify that only one attribute is selected per branch
    for (int i=0;i<fLocationPaths.length;i++) {
        for(int j=0; j<fLocationPaths[i].steps.length; j++) {
            com.sun.org.apache.xerces.internal.impl.xpath.XPath.Axis axis =
                fLocationPaths[i].steps[j].axis;
            if (axis.type == XPath.Axis.ATTRIBUTE &&
                    (j < fLocationPaths[i].steps.length-1)) {
                throw new XPathException("c-fields-xpaths");
            }
        }
    }
}
 

import com.sun.org.apache.xerces.internal.impl.xpath.XPathException; //导入依赖的package包/类
/** Constructs a selector XPath expression. */
public XPath(String xpath, SymbolTable symbolTable,
             NamespaceContext context) throws XPathException {
    super(normalize(xpath), symbolTable, context);
    // verify that an attribute is not selected
    for (int i=0;i<fLocationPaths.length;i++) {
        com.sun.org.apache.xerces.internal.impl.xpath.XPath.Axis axis =
        fLocationPaths[i].steps[fLocationPaths[i].steps.length-1].axis;
        if (axis.type == XPath.Axis.ATTRIBUTE) {
            throw new XPathException("c-selector-xpath");
        }
    }

}