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Byte Buddy is a Java library for creating Java classes at run time.
This artifact is a build of Byte Buddy with a remaining dependency onto ASM.
You should never depend on this module without repackaging Byte Buddy and ASM into your own namespace.
/*
* Copyright 2014 - Present Rafael Winterhalter
*
* Licensed 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 net.bytebuddy;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import net.bytebuddy.build.AccessControllerPlugin;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.ClassFileLocator;
import net.bytebuddy.utility.nullability.MaybeNull;
import org.objectweb.asm.Opcodes;
import java.io.IOException;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.security.PrivilegedAction;
/**
* A wrapper object for representing a validated class file version in the format that is specified by the
* JVMS.
*/
public class ClassFileVersion implements Comparable, Serializable {
/**
* The class's serial version UID.
*/
private static final long serialVersionUID = 1L;
/**
* Returns the minimal version number that is legal.
*/
protected static final int BASE_VERSION = 44;
/**
* The class file version of Java 1.
*/
public static final ClassFileVersion JAVA_V1 = new ClassFileVersion(Opcodes.V1_1);
/**
* The class file version of Java 2.
*/
public static final ClassFileVersion JAVA_V2 = new ClassFileVersion(Opcodes.V1_2);
/**
* The class file version of Java 3.
*/
public static final ClassFileVersion JAVA_V3 = new ClassFileVersion(Opcodes.V1_3);
/**
* The class file version of Java 4.
*/
public static final ClassFileVersion JAVA_V4 = new ClassFileVersion(Opcodes.V1_4);
/**
* The class file version of Java 5.
*/
public static final ClassFileVersion JAVA_V5 = new ClassFileVersion(Opcodes.V1_5);
/**
* The class file version of Java 6.
*/
public static final ClassFileVersion JAVA_V6 = new ClassFileVersion(Opcodes.V1_6);
/**
* The class file version of Java 7.
*/
public static final ClassFileVersion JAVA_V7 = new ClassFileVersion(Opcodes.V1_7);
/**
* The class file version of Java 8.
*/
public static final ClassFileVersion JAVA_V8 = new ClassFileVersion(Opcodes.V1_8);
/**
* The class file version of Java 9.
*/
public static final ClassFileVersion JAVA_V9 = new ClassFileVersion(Opcodes.V9);
/**
* The class file version of Java 10.
*/
public static final ClassFileVersion JAVA_V10 = new ClassFileVersion(Opcodes.V10);
/**
* The class file version of Java 11.
*/
public static final ClassFileVersion JAVA_V11 = new ClassFileVersion(Opcodes.V11);
/**
* The class file version of Java 12.
*/
public static final ClassFileVersion JAVA_V12 = new ClassFileVersion(Opcodes.V12);
/**
* The class file version of Java 13.
*/
public static final ClassFileVersion JAVA_V13 = new ClassFileVersion(Opcodes.V13);
/**
* The class file version of Java 14.
*/
public static final ClassFileVersion JAVA_V14 = new ClassFileVersion(Opcodes.V14);
/**
* The class file version of Java 15.
*/
public static final ClassFileVersion JAVA_V15 = new ClassFileVersion(Opcodes.V15);
/**
* The class file version of Java 16.
*/
public static final ClassFileVersion JAVA_V16 = new ClassFileVersion(Opcodes.V16);
/**
* The class file version of Java 17.
*/
public static final ClassFileVersion JAVA_V17 = new ClassFileVersion(Opcodes.V17);
/**
* The class file version of Java 18.
*/
public static final ClassFileVersion JAVA_V18 = new ClassFileVersion(Opcodes.V18);
/**
* The class file version of Java 19.
*/
public static final ClassFileVersion JAVA_V19 = new ClassFileVersion(Opcodes.V19);
/**
* The class file version of Java 20.
*/
public static final ClassFileVersion JAVA_V20 = new ClassFileVersion(Opcodes.V20);
/**
* The class file version of Java 21.
*/
public static final ClassFileVersion JAVA_V21 = new ClassFileVersion(Opcodes.V21);
/**
* The class file version of Java 22.
*/
public static final ClassFileVersion JAVA_V22 = new ClassFileVersion(Opcodes.V22);
/**
* The class file version of Java 23.
*/
public static final ClassFileVersion JAVA_V23 = new ClassFileVersion(Opcodes.V23);
/**
* The class file version of Java 24.
*/
public static final ClassFileVersion JAVA_V24 = new ClassFileVersion(Opcodes.V24);
/**
* An array of class file versions in their sorting order.
*/
private static final ClassFileVersion[] CLASS_FILE_VERSIONS = new ClassFileVersion[] {ClassFileVersion.JAVA_V1,
ClassFileVersion.JAVA_V2,
ClassFileVersion.JAVA_V3,
ClassFileVersion.JAVA_V4,
ClassFileVersion.JAVA_V5,
ClassFileVersion.JAVA_V6,
ClassFileVersion.JAVA_V7,
ClassFileVersion.JAVA_V8,
ClassFileVersion.JAVA_V9,
ClassFileVersion.JAVA_V10,
ClassFileVersion.JAVA_V11,
ClassFileVersion.JAVA_V12,
ClassFileVersion.JAVA_V13,
ClassFileVersion.JAVA_V14,
ClassFileVersion.JAVA_V15,
ClassFileVersion.JAVA_V16,
ClassFileVersion.JAVA_V17,
ClassFileVersion.JAVA_V18,
ClassFileVersion.JAVA_V19,
ClassFileVersion.JAVA_V20,
ClassFileVersion.JAVA_V21,
ClassFileVersion.JAVA_V22,
ClassFileVersion.JAVA_V23,
ClassFileVersion.JAVA_V24};
/**
* A version locator for the executing JVM.
*/
private static final VersionLocator VERSION_LOCATOR = doPrivileged(VersionLocator.Resolver.INSTANCE);
/**
* The version number that is represented by this class file version instance.
*/
private final int versionNumber;
/**
* Creates a wrapper for a given minor-major release of the Java class file format.
*
* @param versionNumber The minor-major release number.
*/
protected ClassFileVersion(int versionNumber) {
this.versionNumber = versionNumber;
}
/**
* A proxy for {@code java.security.AccessController#doPrivileged} that is activated if available.
*
* @param action The action to execute from a privileged context.
* @param The type of the action's resolved value.
* @return The action's resolved value.
*/
@AccessControllerPlugin.Enhance
private static T doPrivileged(PrivilegedAction action) {
return action.run();
}
/**
* Creates a wrapper for a given minor-major release of the Java class file format.
*
* @param versionNumber The minor-major release number.
* @return A representation of the version number.
*/
public static ClassFileVersion ofMinorMajor(int versionNumber) {
ClassFileVersion classFileVersion = new ClassFileVersion(versionNumber);
if (classFileVersion.getMajorVersion() > 0 && classFileVersion.getMajorVersion() <= BASE_VERSION) {
throw new IllegalArgumentException("Class version " + versionNumber + " is not valid");
}
return classFileVersion;
}
/**
* Returns the Java class file by its representation by a version string in accordance to the formats known to javac.
*
* @param javaVersionString The Java version string.
* @return The appropriate class file version.
*/
public static ClassFileVersion ofJavaVersionString(String javaVersionString) {
int index = javaVersionString.indexOf('.');
try {
int javaVersion;
if (index == -1) {
javaVersion = Integer.parseInt(javaVersionString);
} else {
javaVersion = Integer.parseInt(javaVersionString.substring(index + 1));
if (Integer.parseInt(javaVersionString.substring(0, index)) != 1 || javaVersion > 8) {
throw new IllegalArgumentException("Java versions with minor version must be of format 1.[1-7]: " + javaVersionString);
}
}
return ofJavaVersion(javaVersion);
} catch (NumberFormatException exception) {
throw new IllegalStateException("Failed to read Java version from: " + javaVersionString, exception);
}
}
/**
* Creates a class file version for a given major release of Java. Currently, all versions reaching from
* Java 1 to Java 9 are supported.
*
* @param javaVersion The Java version.
* @return A wrapper for the given Java class file version.
*/
public static ClassFileVersion ofJavaVersion(int javaVersion) {
if (javaVersion < 1) {
throw new IllegalArgumentException("Java version must be positive: " + javaVersion);
} else if (javaVersion - 1 < CLASS_FILE_VERSIONS.length) {
return CLASS_FILE_VERSIONS[javaVersion - 1];
} else {
return new ClassFileVersion(BASE_VERSION + javaVersion);
}
}
/**
* Returns the latest officially supported Java version when experimental support is not enabled.
*
* @return The latest officially supported Java version.
*/
public static ClassFileVersion latest() {
return ClassFileVersion.JAVA_V24;
}
/**
* Finds the highest class file version that is compatible to the current JVM version. Prior to Java 9, this is achieved
* by parsing the {@code java.version} property which is provided by {@link java.lang.System#getProperty(String)}. If the system
* property is not available, an {@link IllegalStateException} is thrown.
*
* @return The currently running Java process's class file version.
*/
public static ClassFileVersion ofThisVm() {
return VERSION_LOCATOR.resolve();
}
/**
* Finds the highest class file version that is compatible to the current JVM version. Prior to Java 9, this is achieved
* by parsing the {@code java.version} property which is provided by {@link java.lang.System#getProperty(String)}. If the system
* property is not available, the {@code fallback} version is returned.
*
* @param fallback The version to fall back to if locating a class file version is not possible.
* @return The currently running Java process's class file version or the fallback if locating this version is impossible.
*/
@SuppressFBWarnings(value = "REC_CATCH_EXCEPTION", justification = "Exception should not be rethrown but trigger a fallback.")
public static ClassFileVersion ofThisVm(ClassFileVersion fallback) {
try {
return ofThisVm();
} catch (Exception ignored) {
return fallback;
}
}
/**
* Extracts a class' class version. The class' byte code is located by querying the {@link ClassLoader} of the class.
*
* @param type The type for which to locate a class file version.
* @return The type's class file version.
* @throws IOException If an error occurs while reading the class file.
*/
public static ClassFileVersion of(Class type) throws IOException {
return of(type, ClassFileLocator.ForClassLoader.of(type.getClassLoader()));
}
/**
* Extracts a class' class version.
*
* @param type The type for which to locate a class file version.
* @param classFileLocator The class file locator to query for a class file.
* @return The type's class file version.
* @throws IOException If an error occurs while reading the class file.
*/
public static ClassFileVersion of(Class type, ClassFileLocator classFileLocator) throws IOException {
return of(TypeDescription.ForLoadedType.of(type), classFileLocator);
}
/**
* Extracts a class' class version.
*
* @param typeDescription The type for which to locate a class file version.
* @param classFileLocator The class file locator to query for a class file.
* @return The type's class file version.
* @throws IOException If an error occurs while reading the class file.
*/
public static ClassFileVersion of(TypeDescription typeDescription, ClassFileLocator classFileLocator) throws IOException {
return ofClassFile(classFileLocator.locate(typeDescription.getName()).resolve());
}
/**
* Extracts a class' class version from a class file.
*
* @param binaryRepresentation The class file's binary representation.
* @return The supplied class file's class file version.
*/
public static ClassFileVersion ofClassFile(byte[] binaryRepresentation) {
if (binaryRepresentation.length < 7) {
throw new IllegalArgumentException("Supplied byte array is too short to be a class file with " + binaryRepresentation.length + " byte");
}
return ofMinorMajor(binaryRepresentation[4] << 24
| binaryRepresentation[5] << 16
| binaryRepresentation[6] << 8
| binaryRepresentation[7]);
}
/**
* Returns the minor-major release number of this class file version.
*
* @return The minor-major release number of this class file version.
*/
public int getMinorMajorVersion() {
return versionNumber;
}
/**
* Returns the major version this instance represents.
*
* @return The major version this instance represents.
*/
public short getMajorVersion() {
return (short) (versionNumber & 0xFFFF);
}
/**
* Returns the minor version this instance represents.
*
* @return The minor version this instance represents.
*/
public short getMinorVersion() {
return (short) (versionNumber >>> 16);
}
/**
* Returns the Java runtime version number of this class file version.
*
* @return The Java runtime version.
*/
public int getJavaVersion() {
return getMajorVersion() - BASE_VERSION;
}
/**
* Checks if this class file version is at least as new as the provided version.
*
* @param classFileVersion The version to check against.
* @return {@code true} if this version is at least of the given version.
*/
public boolean isAtLeast(ClassFileVersion classFileVersion) {
return compareTo(classFileVersion) > -1;
}
/**
* Checks if this class file version is newer than the provided version.
*
* @param classFileVersion The version to check against.
* @return {@code true} if this version is newer than the provided version.
*/
public boolean isGreaterThan(ClassFileVersion classFileVersion) {
return compareTo(classFileVersion) > 0;
}
/**
* Checks if this class file version is at most as new as the provided version.
*
* @param classFileVersion The version to check against.
* @return {@code true} if this version is as most as new as the provided version.
*/
public boolean isAtMost(ClassFileVersion classFileVersion) {
return compareTo(classFileVersion) < 1;
}
/**
* Checks if this class file version is older than the provided version.
*
* @param classFileVersion The version to check against.
* @return {@code true} if this version is older than the provided version.
*/
public boolean isLessThan(ClassFileVersion classFileVersion) {
return compareTo(classFileVersion) < 0;
}
/**
* Returns this class file version indicating a class using preview features.
*
* @return This class file version but indicating the use of preview features.
*/
public ClassFileVersion asPreviewVersion() {
return new ClassFileVersion(versionNumber | Opcodes.V_PREVIEW);
}
/**
* Returns {@code true} if this class file version indicates the use of preview features.
*
* @return {@code true} if this class file version indicates the use of preview features.
*/
public boolean isPreviewVersion() {
return (versionNumber & Opcodes.V_PREVIEW) == Opcodes.V_PREVIEW;
}
/**
* {@inheritDoc}
*/
public int compareTo(ClassFileVersion other) {
return Integer.signum(getMajorVersion() == other.getMajorVersion()
? getMinorVersion() - other.getMinorVersion()
: getMajorVersion() - other.getMajorVersion());
}
@Override
public int hashCode() {
return versionNumber;
}
@Override
public boolean equals(@MaybeNull Object other) {
if (this == other) {
return true;
} else if (other == null || getClass() != other.getClass()) {
return false;
}
return versionNumber == ((ClassFileVersion) other).versionNumber;
}
@Override
public String toString() {
return "Java " + getJavaVersion() + " (" + getMinorMajorVersion() + ")";
}
/**
* A locator for the executing VM's Java version.
*/
protected interface VersionLocator {
/**
* A suffix that might indicate an early access version of Java.
*/
String EARLY_ACCESS = "-ea";
/**
* A suffix that might indicate an internal version of Java.
*/
String INTERNAL = "-internal";
/**
* The property for reading the current VM's Java version.
*/
String JAVA_VERSION = "java.version";
/**
* Locates the current VM's major version number.
*
* @return The current VM's major version number.
*/
ClassFileVersion resolve();
/**
* A resolver for the current VM's class file version.
*/
enum Resolver implements PrivilegedAction {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "REC_CATCH_EXCEPTION", justification = "Exception should not be rethrown but trigger a fallback.")
public VersionLocator run() {
try {
Class type = Class.forName(Runtime.class.getName() + "$Version");
Method method;
try {
method = type.getMethod("feature");
} catch (NoSuchMethodException ignored) {
method = type.getMethod("major");
}
return new Resolved(ClassFileVersion.ofJavaVersion((Integer) method.invoke(Runtime.class.getMethod("version").invoke(null))));
} catch (Throwable ignored) {
try {
String versionString = System.getProperty(JAVA_VERSION);
if (versionString == null) {
throw new IllegalStateException("Java version property is not set");
} else if (versionString.equals("0")) { // Used by Android, assume Java 6 defensively.
return new Resolved(ClassFileVersion.JAVA_V6);
}
if (versionString.endsWith(EARLY_ACCESS)) {
versionString = versionString.substring(0, versionString.length() - EARLY_ACCESS.length());
} else if (versionString.endsWith(INTERNAL)) {
versionString = versionString.substring(0, versionString.length() - INTERNAL.length());
}
int[] versionIndex = {-1, 0, 0};
for (int index = 1; index < 3; index++) {
versionIndex[index] = versionString.indexOf('.', versionIndex[index - 1] + 1);
if (versionIndex[index] == -1) {
throw new IllegalStateException("This JVM's version string does not seem to be valid: " + versionString);
}
}
return new Resolved(ClassFileVersion.ofJavaVersion(Integer.parseInt(versionString.substring(versionIndex[1] + 1, versionIndex[2]))));
} catch (Throwable throwable) {
return new Unresolved(throwable.getMessage());
}
}
}
}
/**
* A version locator for a resolved class file version.
*/
@HashCodeAndEqualsPlugin.Enhance
class Resolved implements VersionLocator {
/**
* The resolved class file version.
*/
private final ClassFileVersion classFileVersion;
/**
* Creates a new resolved version locator.
*
* @param classFileVersion The resolved class file version.
*/
protected Resolved(ClassFileVersion classFileVersion) {
this.classFileVersion = classFileVersion;
}
/**
* {@inheritDoc}
*/
public ClassFileVersion resolve() {
return classFileVersion;
}
}
/**
* An unresolved version locator.
*/
@HashCodeAndEqualsPlugin.Enhance
class Unresolved implements VersionLocator {
/**
* The message of the exception that explains the resolution error.
*/
private final String message;
/**
* Creates an unresolved version locator.
*
* @param message The message of the exception that explains the resolution error.
*/
protected Unresolved(String message) {
this.message = message;
}
/**
* {@inheritDoc}
*/
public ClassFileVersion resolve() {
throw new IllegalStateException("Failed to resolve the class file version of the current VM: " + message);
}
}
}
}
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