net.bytebuddy.implementation.bytecode.constant.SerializedConstant Maven / Gradle / Ivy
/*
* 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.implementation.bytecode.constant;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.description.method.MethodDescription;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.bytecode.Duplication;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.implementation.bytecode.TypeCreation;
import net.bytebuddy.implementation.bytecode.member.MethodInvocation;
import net.bytebuddy.utility.nullability.MaybeNull;
import org.objectweb.asm.MethodVisitor;
import java.io.*;
/**
* A constant that represents a value in its serialized form.
*/
@HashCodeAndEqualsPlugin.Enhance
public class SerializedConstant extends StackManipulation.AbstractBase {
/**
* A charset that does not change the supplied byte array upon encoding or decoding.
*/
private static final String CHARSET = "ISO-8859-1";
/**
* The serialized value.
*/
private final String serialization;
/**
* Creates a new constant for a serialized value.
*
* @param serialization The serialized value.
*/
protected SerializedConstant(String serialization) {
this.serialization = serialization;
}
/**
* Creates a new stack manipulation to load the supplied value onto the stack.
*
* @param value The value to serialize or {@code null}.
* @return A stack manipulation to serialize the supplied value.
*/
public static StackManipulation of(@MaybeNull Serializable value) {
if (value == null) {
return NullConstant.INSTANCE;
}
try {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
try {
objectOutputStream.writeObject(value);
} finally {
objectOutputStream.close();
}
return new SerializedConstant(byteArrayOutputStream.toString(CHARSET));
} catch (IOException exception) {
throw new IllegalStateException("Cannot serialize " + value, exception);
}
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
try {
return new StackManipulation.Compound(
TypeCreation.of(TypeDescription.ForLoadedType.of(ObjectInputStream.class)),
Duplication.SINGLE,
TypeCreation.of(TypeDescription.ForLoadedType.of(ByteArrayInputStream.class)),
Duplication.SINGLE,
new TextConstant(serialization),
new TextConstant(CHARSET),
MethodInvocation.invoke(new MethodDescription.ForLoadedMethod(String.class.getMethod("getBytes", String.class))),
MethodInvocation.invoke(new MethodDescription.ForLoadedConstructor(ByteArrayInputStream.class.getConstructor(byte[].class))),
MethodInvocation.invoke(new MethodDescription.ForLoadedConstructor(ObjectInputStream.class.getConstructor(InputStream.class))),
MethodInvocation.invoke(new MethodDescription.ForLoadedMethod(ObjectInputStream.class.getMethod("readObject")))
).apply(methodVisitor, implementationContext);
} catch (NoSuchMethodException exception) {
throw new IllegalStateException("Could not locate Java API method", exception);
}
}
}