net.bytebuddy.implementation.bytecode.assign.InstanceCheck 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.assign;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* Implements an {@code instanceof} check.
*/
@HashCodeAndEqualsPlugin.Enhance
public class InstanceCheck extends StackManipulation.AbstractBase {
/**
* The type to apply the instance check against.
*/
private final TypeDescription typeDescription;
/**
* Creates a new instance check.
*
* @param typeDescription The type to apply the instance check against.
*/
protected InstanceCheck(TypeDescription typeDescription) {
this.typeDescription = typeDescription;
}
/**
* Creates a new instance check.
*
* @param typeDescription The type to apply the instance check against.
* @return An appropriate stack manipulation.
*/
public static StackManipulation of(TypeDescription typeDescription) {
if (typeDescription.isPrimitive()) {
throw new IllegalArgumentException("Cannot check an instance against a primitive type: " + typeDescription);
}
return new InstanceCheck(typeDescription);
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitTypeInsn(Opcodes.INSTANCEOF, typeDescription.getInternalName());
return Size.ZERO;
}
}