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CNRI Handle.net Software (Permission granted for redistribution by Giridhar Manepalli at CNRI)
/**********************************************************************\
© COPYRIGHT 2019 Corporation for National Research Initiatives (CNRI);
All rights reserved.
The HANDLE.NET software is made available subject to the
Handle.Net Public License Agreement, which may be obtained at
http://hdl.handle.net/20.1000/112 or hdl:20.1000/112
\**********************************************************************/
package net.cnri.simplexml;
public abstract class XUtil {
public static final String encodeString(String str) {
StringBuilder sb = new StringBuilder();
int n = str.length();
for (int i = 0; i < n; i++) {
char ch = str.charAt(i);
if (ch == '&') {
sb.append("&");
} else if (ch == '<') {
sb.append("<");
} else if (ch == '>') {
sb.append(">");
} else if (ch == '"') {
sb.append(""");
} else if (ch == '\'') {
sb.append("'");
} else if (ch >= 255) { // encode all non-ascii characters
sb.append("&#");
sb.append((int) ch);
sb.append(';');
} else {
sb.append(ch);
}
}
return sb.toString();
}
public static final String decodeString(String str) {
StringBuilder sb = new StringBuilder();
int n = str.length();
for (int i = 0; i < n; i++) {
char ch = str.charAt(i);
if (ch == '&') {
String entity = readEntity(str, i);
i += entity.length() - 1;
sb.append(decodeEntity(entity));
} else {
sb.append(ch);
}
}
return sb.toString();
}
private static String decodeEntity(String entity) {
String upper = entity.toUpperCase();
if (upper.equals("&")) {
return "&";
} else if (upper.equals("<")) {
return "<";
} else if (upper.equals(">")) {
return ">";
} else if (upper.equals(""")) {
return "\"";
} else if (upper.equals("&APOS;")) {
return "\'";
} else if (upper.startsWith("&#X")) {
try {
return String.valueOf(Character.toChars(Integer.parseInt(entity.substring(3, entity.length() - 1), 16)));
} catch (Exception e) {
// System.err.println("Error: invalid character encoding: "+entity.substring(2));
}
} else if (entity.startsWith("&#")) {
try {
return String.valueOf(Character.toChars(Integer.parseInt(entity.substring(2, entity.length() - 1))));
} catch (Exception e) {
// System.err.println("Error: invalid character encoding: "+entity.substring(2));
}
}
// System.err.println("Error: unidentified entity: "+entity);
return entity;
}
private static String readEntity(String str, int index) {
int eIndex = index + 1;
while (eIndex < str.length() && str.charAt(eIndex) != ';')
eIndex++;
eIndex = Math.min(str.length() - 1, eIndex);
return str.substring(index, eIndex + 1);
}
}