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package org.glassfish.jersey.message.internal;
/**
* Internal {@link StringBuilder string builder} utilities for building HTTP header
* values.
*
* @author Marc Hadley
* @author Marek Potociar (marek.potociar at oracle.com)
* @author Martin Matula (martin.matula at oracle.com)
*/
public class StringBuilderUtils {
/**
* Append a new value to the string builder.
*
* If the value contains non-token characters (e.g. control, white-space,
* quotes, separators, etc.), the appended value is quoted and all the quotes
* in the value are escaped.
*
* @param b string builder to be updated.
* @param value value to be appended.
*/
public static void appendQuotedIfNonToken(StringBuilder b, String value) {
if (value == null) {
return;
}
boolean quote = !GrammarUtil.isTokenString(value);
if (quote) {
b.append('"');
}
appendEscapingQuotes(b, value);
if (quote) {
b.append('"');
}
}
/**
* Append a new value to the string builder.
*
* If the value contains white-space characters, the appended
* value is quoted and all the quotes in the value are escaped.
*
* @param b string builder to be updated.
* @param value value to be appended.
*/
public static void appendQuotedIfWhitespace(StringBuilder b, String value) {
if (value == null) {
return;
}
boolean quote = GrammarUtil.containsWhiteSpace(value);
if (quote) {
b.append('"');
}
appendEscapingQuotes(b, value);
if (quote) {
b.append('"');
}
}
/**
* Append a new quoted value to the string builder.
*
* The appended value is quoted and all the quotes in the value are escaped.
*
* @param b string builder to be updated.
* @param value value to be appended.
*/
public static void appendQuoted(StringBuilder b, String value) {
b.append('"');
appendEscapingQuotes(b, value);
b.append('"');
}
/**
* Append a new value to the string builder.
*
* All the quotes in the value are escaped before appending.
*
* @param b string builder to be updated.
* @param value value to be appended.
*/
public static void appendEscapingQuotes(StringBuilder b, String value) {
for (int i = 0; i < value.length(); i++) {
char c = value.charAt(i);
if (c == '"') {
b.append('\\');
}
b.append(c);
}
}
/**
* Prevents instantiation.
*/
private StringBuilderUtils() {
}
}