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XMLUtil.java
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Tue, Jul 16, 22:39

XMLUtil.java
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package ch.epfl.lca1.medco.util;
import ch.epfl.lca1.medco.util.exceptions.I2B2XMLException;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* Util class containing functions related to XML handling.
*/
public class XMLUtil {
public static final String[][] XML_CHARS_ESCAPES = {
{"&", "&"}, // must be first
{"\"", """},
{"'", "'"},
{"<", "&lt;"},
{">", "&gt;"}
};
/**
* Given an InputStream, search for an XML (defined by the start and end tag) and extract it as a string.
* Should be called only if the process is over and nothing is written further in the stream.
* @param stdin the InputStream from which data is read
* @throws I2B2XMLException in case of invalid XML
*/
public static String xmlStringFromStream(InputStream stdin, String startTag, String endTag, boolean omitSurroundingTags) throws I2B2XMLException {
Logger.debug("Scanning stdin for XML result.");
BufferedReader buffStdIn = new BufferedReader(new InputStreamReader(stdin));
// extract all lines containing the xml
StringBuilder xmlSb = new StringBuilder();
for (Iterator<String> it = buffStdIn.lines().iterator(); it.hasNext() ;) {
String line = it.next();
Logger.debug("stdin line: " + line);
if (line.contains(startTag)) {
while (!line.contains(endTag)) {
xmlSb.append(line);
try {
line = it.next();
} catch (NoSuchElementException e) {
throw Logger.error(new I2B2XMLException("Arrived at end of stream: could not find the end of the XML.", e));
}
}
xmlSb.append(line);
break;
}
}
// trim the xml string and return it
int startIdx = omitSurroundingTags ?
xmlSb.indexOf(startTag) + startTag.length():
xmlSb.indexOf(startTag);
int endIdx = omitSurroundingTags ?
xmlSb.indexOf(endTag) :
xmlSb.indexOf(endTag) + endTag.length();
try {
String xmlString = xmlSb.substring(startIdx, endIdx);
if (xmlString.length() == 0) {
throw Logger.error(new I2B2XMLException("Invalid xml string value."));
}
return xmlString;
} catch (StringIndexOutOfBoundsException e) {
throw Logger.error(new I2B2XMLException("Invalid xml string value.", e));
}
}
/**
* Escapes XML special character from a string, to make it pluggable into some XML.
*
* @param val the value to escape
* @return the escaped value
*/
public static String escapeXmlValue(String val) {
String escapedVal = val;
for (int i = 0 ; i < XML_CHARS_ESCAPES.length ; i++) {
escapedVal = escapedVal.replace(XML_CHARS_ESCAPES[i][0], XML_CHARS_ESCAPES[i][1]);
}
return escapedVal;
}
public static String unEscapeXmlValue(String val) {
String unEscapedVal = val;
for (int i = 0 ; i < XML_CHARS_ESCAPES.length ; i++) {
unEscapedVal = unEscapedVal.replace(XML_CHARS_ESCAPES[i][1], XML_CHARS_ESCAPES[i][0]);
}
return unEscapedVal;
}
}

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