de.julielab.xml.JulieXMLToolsCLIRecords Maven / Gradle / Ivy

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Reads XML using the VTD parser.

There is a newer version: 0.6.7

package de.julielab.xml;

import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

public class JulieXMLToolsCLIRecords {

	public static void main(String[] args) {
		if (args.length < 3) {
			System.out
					.println("Usage: "
							+ JulieXMLToolsCLI.class.getName()
							+ "    *");
			System.out.println("This tool is meant to extract particular fields of XML files representing a list of records. The result is a table where each field XPath expression is evaluated for one field.");
			System.out.println("The record XPath expression must point to the list of records, i.e. typically a repeating path. The field XPath must be relative to the record XPath!");
			System.out.println("If a field XPath may be evaluated multiple times, i.e. the element pointed to exists more than once (lists), all values will be concatenated with a comma by default. Set the system property de.julielab.xmltools.delim to another delimiter if required.");
			System.exit(1);
		}
		
		String fileName = args[0];
		String forEach = args[1];
		String[] fieldPaths = new String[args.length-2];
		System.arraycopy(args, 2, fieldPaths, 0, fieldPaths.length);
		String delimiter = System.getProperty("de.julielab.xmltools.delim");
		
		List> fields = new ArrayList<>();
		for (int i = 0; i < fieldPaths.length; i++) {
			String path = fieldPaths[i];
			Map field = new HashMap();
			field.put(JulieXMLConstants.NAME, "fieldvalue" + i);
			field.put(JulieXMLConstants.XPATH, path);
			if (!StringUtils.isBlank(delimiter))
				field.put(JulieXMLConstants.CONCAT_STRING, delimiter);
			fields.add(field);
		}
		
		Iterator> rowIterator = JulieXMLTools.constructRowIterator(fileName, 1024, forEach, fields, false);
		
		
		PrintStream out = null;
			try {
				out = new PrintStream(System.out, true, "UTF-8");
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}

		while (rowIterator.hasNext()) {
			Map row = rowIterator.next();
			List rowValues = new ArrayList<>();
			for (int i = 0; i < fieldPaths.length; i++) {
				String value = (String) row.get("fieldvalue" + i);
				rowValues.add(value);
			}
			out.println(StringUtils.join(rowValues, "\t"));
		}
	}

}