org.eolang.parser.StXPath Maven / Gradle / Ivy
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package org.eolang.parser;
import com.jcabi.xml.XML;
import com.jcabi.xml.XMLDocument;
import com.yegor256.xsline.Shift;
import java.util.List;
import java.util.function.Function;
import org.xembly.Directive;
import org.xembly.Directives;
import org.xembly.Xembler;
/**
* This {@link Shift} finds all XPath matches and replaces them
* with what a function suggests.
*
* @since 0.29.0
*/
public final class StXPath implements Shift {
/**
* XPath to search for.
*/
private final String xpath;
/**
* The mapping function.
*/
private final Function> fun;
/**
* Ctor.
* @param path The XPath
* @param func The function
*/
public StXPath(final String path, final Function> func) {
this.xpath = path;
this.fun = func;
}
@Override
public String uid() {
return this.getClass().getSimpleName();
}
@Override
public XML apply(final int position, final XML xml) {
final List nodes = xml.nodes(this.xpath);
if (nodes.size() > 1) {
throw new IllegalArgumentException(
String.format(
"XPath '%s' returned too many elements (%d)",
this.xpath, nodes.size()
)
);
}
final Directives dirs = new Directives();
if (!nodes.isEmpty()) {
dirs.xpath(this.xpath);
dirs.append(this.fun.apply(nodes.get(0)));
}
return new XMLDocument(
new Xembler(dirs).applyQuietly(xml.node())
);
}
}