org.gramar.base.function.LowercaseFirstFunction Maven / Gradle / Ivy

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A lightweght, pure-Java component that makes composite software architecture design patterns extremely consumable through code generation.

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package org.gramar.base.function;

import java.util.List;

import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionException;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class LowercaseFirstFunction implements XPathFunction {

	public LowercaseFirstFunction() {

	}

	@Override
	public Object evaluate(List args) throws XPathFunctionException {
		String original = null;
		Object val = args.get(0);
		if (val instanceof String) {
			original = (String) val;
		} else if (val instanceof NodeList) {
			NodeList nl = (NodeList) val;
			Node item = nl.item(0);
			if (item == null) {
				throw new XPathFunctionException("argument for lowercaseFirst() is null");
			}
			original = item.getNodeValue();
		}
		if (original.length() == 0) {
			throw new XPathFunctionException("argument for lowercaseFirst() has length 0");
		}
		return original.substring(0, 1).toLowerCase() + original.substring(1);
	}

}