test/jdk/java/nio/charset/Charset/IllegalCharsetName.java

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/* @test
 * @bug 6330020 8184665
 * @summary Ensure Charset.forName/isSupport throws the correct exception
 *          if the charset names passed in are illegal.
 */

import java.nio.charset.*;

public class IllegalCharsetName {
    public static void main(String[] args) throws Exception {
        String[] illegalNames = {
            ".",
            "_",
            ":",
            "-",
            ".name",
            "_name",
            ":name",
            "-name",
            "name*name",
            "name?name"
        };
        for (int i = 0; i < illegalNames.length; i++) {
            try {
                Charset.forName(illegalNames[i]);
                throw new Exception("Charset.forName(): No exception thrown");
            } catch (IllegalCharsetNameException x) { //expected
            }

            try {
                Charset.isSupported(illegalNames[i]);
                throw new Exception("Charset.isSupported(): No exception thrown");
            } catch (IllegalCharsetNameException x) { //expected
            }
        }

        // Standard charsets may bypass alias checking during startup, test that
        // they're all well-behaved as a sanity test
        checkAliases(StandardCharsets.ISO_8859_1);
        checkAliases(StandardCharsets.US_ASCII);
        checkAliases(StandardCharsets.UTF_8);
    }

    private static void checkAliases(Charset cs) {
        for (String alias : cs.aliases()) {
            Charset.forName(alias);
            Charset.isSupported(alias);
        }
    }
}