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/**
The contents of this file are subject to the Mozilla Public License Version 1.1
(the "License"); you may not use this file except in compliance with the License.
You may obtain a copy of the License at http://www.mozilla.org/MPL/
Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
specific language governing rights and limitations under the License.
The Original Code is "Escape.java". Description:
"Handles "escaping" and "unescaping" of text according to the HL7 escape sequence rules
defined in section 2.10 of the standard (version 2.4)"
The Initial Developer of the Original Code is University Health Network. Copyright (C)
2001. All Rights Reserved.
Contributor(s): Mark Lee (Skeva Technologies); Elmar Hinz
Alternatively, the contents of this file may be used under the terms of the
GNU General Public License (the "GPL"), in which case the provisions of the GPL are
applicable instead of those above. If you wish to allow use of your version of this
file only under the terms of the GPL and not to allow others to use your version
of this file under the MPL, indicate your decision by deleting the provisions above
and replace them with the notice and other provisions required by the GPL License.
If you do not delete the provisions above, a recipient may use your version of
this file under either the MPL or the GPL.
*/
package ca.uhn.hl7v2.parser;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Handles "escaping" and "unescaping" of text according to the HL7 escape
* sequence rules defined in section 2.10 of the standard (version 2.4).
* Currently, escape sequences for multiple character sets are unsupported. The
* highlighting, hexademical, and locally defined escape sequences are also
* unsupported.
*
* @author Bryan Tripp
* @author Mark Lee (Skeva Technologies)
* @author Elmar Hinz
* @author Christian Ohr
*/
public class DefaultEscaping implements Escaping {
/**
* limits the size of variousEncChars to 1000, can be overridden by system property.
*/
private static Map variousEncChars = Collections.synchronizedMap(new LinkedHashMap
(5, 0.75f, true) {
private static final long serialVersionUID = 1L;
final int maxSize = new Integer(System.getProperty(Escape.class.getName() + ".maxSize", "1000"));
@Override
protected boolean removeEldestEntry(Map.Entry eldest) {
return this.size() > maxSize;
}
});
/**
* @param text string to be escaped
* @param encChars encoding characters to be used
* @return the escaped string
*/
public String escape(String text, EncodingCharacters encChars) {
EncLookup esc = getEscapeSequences(encChars);
int textLength = text.length();
StringBuilder result = new StringBuilder(textLength);
for (int i = 0; i < textLength; i++) {
boolean charReplaced = false;
char c = text.charAt(i);
FORENCCHARS:
for (int j = 0; j < 6; j++) {
if (text.charAt(i) == esc.characters[j]) {
// Formatting escape sequences such as \.br\ should be left alone
if (j == 4) {
if (i+1 < textLength) {
// Check for \.br\
char nextChar = text.charAt(i + 1);
switch (nextChar) {
case '.':
case 'C':
case 'M':
case 'X':
case 'Z':
{
int nextEscapeIndex = text.indexOf(esc.characters[j], i + 1);
if (nextEscapeIndex > 0) {
result.append(text.substring(i, nextEscapeIndex + 1));
charReplaced = true;
i = nextEscapeIndex;
break FORENCCHARS;
}
break;
}
case 'H':
case 'N':
{
if (i+2 < textLength && text.charAt(i+2) == '\\') {
int nextEscapeIndex = i + 2;
if (nextEscapeIndex > 0) {
result.append(text.substring(i, nextEscapeIndex + 1));
charReplaced = true;
i = nextEscapeIndex;
break FORENCCHARS;
}
}
break;
}
}
}
}
result.append(esc.encodings[j]);
charReplaced = true;
break;
}
}
if (!charReplaced) {
result.append(c);
}
}
return result.toString();
}
/**
* @param text string to be unescaped
* @param encChars encoding characters to be used
* @return the unescaped string
*/
public String unescape(String text, EncodingCharacters encChars) {
// If the escape char isn't found, we don't need to look for escape sequences
char escapeChar = encChars.getEscapeCharacter();
boolean foundEscapeChar = false;
for (int i = 0; i < text.length(); i++) {
if (text.charAt(i) == escapeChar) {
foundEscapeChar = true;
break;
}
}
if (!foundEscapeChar) {
return text;
}
int textLength = text.length();
StringBuilder result = new StringBuilder(textLength + 20);
EncLookup esc = getEscapeSequences(encChars);
char escape = esc.characters[4];
int encodingsCount = esc.characters.length;
int i = 0;
while (i < textLength) {
char c = text.charAt(i);
if (c != escape) {
result.append(c);
i++;
} else {
boolean foundEncoding = false;
// Test against the standard encodings
for (int j = 0; j < encodingsCount; j++) {
String encoding = esc.encodings[j];
int encodingLength = encoding.length();
if ((i + encodingLength <= textLength) && text.substring(i, i + encodingLength)
.equals(encoding)) {
result.append(esc.characters[j]);
i += encodingLength;
foundEncoding = true;
break;
}
}
if (!foundEncoding) {
// If we haven't found this, there is one more option. Escape sequences of /.XXXXX/ are
// formatting codes. They should be left intact
if (i + 1 < textLength) {
char nextChar = text.charAt(i + 1);
switch (nextChar) {
case '.':
case 'C':
case 'M':
case 'X':
case 'Z':
{
int closingEscape = text.indexOf(escape, i + 1);
if (closingEscape > 0) {
String substring = text.substring(i, closingEscape + 1);
result.append(substring);
i += substring.length();
} else {
i++;
}
break;
}
case 'H':
case 'N':
{
int closingEscape = text.indexOf(escape, i + 1);
if (closingEscape == i + 2) {
String substring = text.substring(i, closingEscape + 1);
result.append(substring);
i += substring.length();
} else {
i++;
}
break;
}
default:
{
i++;
}
}
} else {
i++;
}
}
}
}
return result.toString();
}
/**
* Returns a HashTable with escape sequences as keys, and corresponding
* Strings as values.
*/
private static EncLookup getEscapeSequences(EncodingCharacters encChars) {
EncLookup escapeSequences = variousEncChars.get(encChars);
if (escapeSequences == null) {
// this means we haven't got the sequences for these encoding
// characters yet - let's make them
escapeSequences = new EncLookup(encChars);
variousEncChars.put(encChars, escapeSequences);
}
return escapeSequences;
}
/**
* A performance-optimized replacement for using when
* mapping from HL7 special characters to their respective
* encodings
*
* @author Christian Ohr
*/
private static class EncLookup {
char[] characters = new char[6];
String[] encodings = new String[6];
EncLookup(EncodingCharacters ec) {
characters[0] = ec.getFieldSeparator();
characters[1] = ec.getComponentSeparator();
characters[2] = ec.getSubcomponentSeparator();
characters[3] = ec.getRepetitionSeparator();
characters[4] = ec.getEscapeCharacter();
characters[5] = '\r';
char[] codes = {'F', 'S', 'T', 'R', 'E'};
for (int i = 0; i < codes.length; i++) {
StringBuilder seq = new StringBuilder();
seq.append(ec.getEscapeCharacter());
seq.append(codes[i]);
seq.append(ec.getEscapeCharacter());
encodings[i] = seq.toString();
}
encodings[5] = "\\X000d\\";
}
}
}
