forked from D-Net/dnet-hadoop
54 lines
1.4 KiB
Java
54 lines
1.4 KiB
Java
package eu.dnetlib.dhp.utils.saxon;
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import net.sf.saxon.expr.XPathContext;
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import net.sf.saxon.om.Sequence;
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import net.sf.saxon.trans.XPathException;
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import net.sf.saxon.value.SequenceType;
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import net.sf.saxon.value.StringValue;
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import org.apache.commons.lang3.StringUtils;
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public class PickFirst extends AbstractExtensionFunction {
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@Override
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public String getName() {
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return "pickFirst";
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}
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@Override
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public Sequence doCall(XPathContext context, Sequence[] arguments) throws XPathException {
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if (arguments == null | arguments.length == 0) {
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return new StringValue("");
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}
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String s1 = arguments[0].head().getStringValue();
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if (arguments.length > 1) {
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String s2 = arguments[1].head().getStringValue();
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return new StringValue(StringUtils.isNotBlank(s1) ? s1 : StringUtils.isNotBlank(s2) ? s2 : "");
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} else {
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return new StringValue(StringUtils.isNotBlank(s1) ? s1 : "");
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}
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}
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@Override
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public int getMinimumNumberOfArguments() {
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return 0;
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}
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@Override
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public int getMaximumNumberOfArguments() {
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return 2;
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}
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@Override
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public SequenceType[] getArgumentTypes() {
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return new SequenceType[] { SequenceType.OPTIONAL_ITEM };
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}
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@Override
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public SequenceType getResultType(SequenceType[] suppliedArgumentTypes) {
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return SequenceType.SINGLE_STRING;
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}
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}
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