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VersionHelper.java
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VersionHelper.java
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/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.jdeps;
import com.sun.tools.classfile.ClassFile;
import com.sun.tools.classfile.ConstantPoolException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
public class VersionHelper {
private static final String META_INF_VERSIONS = "META-INF/versions/";
private static final Map<String,String> nameToVersion = new ConcurrentHashMap<>();
public static String get(String classname) {
if (nameToVersion.containsKey(classname)) {
return nameToVersion.get(classname) + "/" + classname;
}
return classname;
}
public static void add(JarFile jarfile, JarEntry e, ClassFile cf)
throws ConstantPoolException
{
String realName = e.getRealName();
if (realName.startsWith(META_INF_VERSIONS)) {
int len = META_INF_VERSIONS.length();
int n = realName.indexOf('/', len);
if (n > 0) {
String version = realName.substring(len, n);
assert (Integer.parseInt(version) > 8);
String name = cf.getName().replace('/', '.');
String v = nameToVersion.computeIfAbsent(name, _n -> version);
if (!version.equals(v)) {
throw new MultiReleaseException("err.multirelease.version.associated",
name, nameToVersion.get(name), version);
}
} else {
throw new MultiReleaseException("err.multirelease.jar.malformed",
jarfile.getName(), realName);
}
}
}
}