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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.compat;
import java.util.Locale;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLServerSocket;
import org.apache.tomcat.util.res.StringManager;
/**
* This is the base implementation class for JRE compatibility and provides an
* implementation based on Java 6. Sub-classes may extend this class and provide
* alternative implementations for later JRE versions
*/
public class JreCompat {
private static final JreCompat instance;
private static StringManager sm =
StringManager.getManager(JreCompat.class.getPackage().getName());
private static final boolean jre9Available;
private static final boolean jre8Available;
private static final boolean jre7Available;
static {
// This is Tomcat 7 with a minimum Java version of Java 6. The latest
// Java version the optional features require is Java 9.
// Look for the highest supported JVM first
if (Jre9Compat.isSupported()) {
instance = new Jre9Compat();
jre9Available = true;
jre8Available = true;
jre7Available = true;
}
else if (Jre8Compat.isSupported()) {
instance = new Jre8Compat();
jre9Available = false;
jre8Available = true;
jre7Available = true;
} else if (Jre7Compat.isSupported()) {
instance = new Jre7Compat();
jre9Available = false;
jre8Available = false;
jre7Available = true;
} else {
instance = new JreCompat();
jre9Available = false;
jre8Available = false;
jre7Available = false;
}
}
public static JreCompat getInstance() {
return instance;
}
// Java 6 implementation of Java 7 methods
public static boolean isJre7Available() {
return jre7Available;
}
public Locale forLanguageTag(String languageTag) {
// Extract the language and country for this entry
String language = null;
String country = null;
String variant = null;
int dash = languageTag.indexOf('-');
if (dash < 0) {
language = languageTag;
country = "";
variant = "";
} else {
language = languageTag.substring(0, dash);
country = languageTag.substring(dash + 1);
int vDash = country.indexOf('-');
if (vDash > 0) {
String cTemp = country.substring(0, vDash);
variant = country.substring(vDash + 1);
country = cTemp;
} else {
variant = "";
}
}
if (!isAlpha(language) || !isAlpha(country) || !isAlpha(variant)) {
return null;
}
return new Locale(language, country, variant);
}
private static final boolean isAlpha(String value) {
for (int i = 0; i < value.length(); i++) {
char c = value.charAt(i);
if (!((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))) {
return false;
}
}
return true;
}
// Java 6 implementation of Java 8 methods
public static boolean isJre8Available() {
return jre8Available;
}
@SuppressWarnings("unused")
public void setUseServerCipherSuitesOrder(SSLServerSocket socket,
boolean useCipherSuitesOrder) {
throw new UnsupportedOperationException(sm.getString("jreCompat.noServerCipherSuiteOrder"));
}
@SuppressWarnings("unused")
public void setUseServerCipherSuitesOrder(SSLEngine engine,
boolean useCipherSuitesOrder) {
throw new UnsupportedOperationException(sm.getString("jreCompat.noServerCipherSuiteOrder"));
}
// Java 6 implementation of Java 9 methods
public static boolean isJre9Available() {
return jre9Available;
}
/**
* Test if the provided exception is an instance of
* java.lang.reflect.InaccessibleObjectException.
*
* @param t The exception to test
*
* @return {@code true} if the exception is an instance of
* InaccessibleObjectException, otherwise {@code false}
*/
public boolean isInstanceOfInaccessibleObjectException(Throwable t) {
// Exception does not exist prior to Java 9
return false;
}
}
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