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The official Couchbase JVM Core IO Library
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/*
 * 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.build;

import net.bytebuddy.ByteBuddy;
import net.bytebuddy.ClassFileVersion;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.ClassFileLocator;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.dynamic.scaffold.MethodGraph;
import net.bytebuddy.dynamic.scaffold.TypeValidation;
import net.bytebuddy.dynamic.scaffold.inline.MethodNameTransformer;
import net.bytebuddy.implementation.Implementation;

import static net.bytebuddy.matcher.ElementMatchers.isDeclaredBy;
import static net.bytebuddy.matcher.ElementMatchers.not;

/**
 * An entry point for a build tool which is responsible for the transformation's configuration.
 */
public interface EntryPoint {

    /**
     * Returns the Byte Buddy instance to use.
     *
     * @param classFileVersion The class file version in which to represent class files.
     * @return The Byte Buddy instance to use.
     */
    ByteBuddy byteBuddy(ClassFileVersion classFileVersion);

    /**
     * Applies a transformation.
     *
     * @param typeDescription       The type to transform.
     * @param byteBuddy             The Byte Buddy instance to use.
     * @param classFileLocator      The class file locator to use.
     * @param methodNameTransformer The Method name transformer to use.
     * @return A builder for the dynamic type to create.
     */
    DynamicType.Builder transform(TypeDescription typeDescription,
                                     ByteBuddy byteBuddy,
                                     ClassFileLocator classFileLocator,
                                     MethodNameTransformer methodNameTransformer);

    /**
     * Default implementations for an entry point.
     */
    enum Default implements EntryPoint {

        /**
         * An entry point that rebases a type.
         */
        REBASE {
            /**
             * {@inheritDoc}
             * */
            public ByteBuddy byteBuddy(ClassFileVersion classFileVersion) {
                return new ByteBuddy(classFileVersion);
            }

            /**
             * {@inheritDoc}
             * */
            public DynamicType.Builder transform(TypeDescription typeDescription,
                                                    ByteBuddy byteBuddy,
                                                    ClassFileLocator classFileLocator,
                                                    MethodNameTransformer methodNameTransformer) {
                return byteBuddy.rebase(typeDescription, classFileLocator, methodNameTransformer);
            }
        },

        /**
         * An entry point that redefines a type.
         */
        REDEFINE {
            /**
             * {@inheritDoc}
             * */
            public ByteBuddy byteBuddy(ClassFileVersion classFileVersion) {
                return new ByteBuddy(classFileVersion);
            }

            /**
             * {@inheritDoc}
             * */
            public DynamicType.Builder transform(TypeDescription typeDescription,
                                                    ByteBuddy byteBuddy,
                                                    ClassFileLocator classFileLocator,
                                                    MethodNameTransformer methodNameTransformer) {
                return byteBuddy.redefine(typeDescription, classFileLocator);
            }
        },

        /**
         * An entry point that redefines a type and which does not change the dynamic type's shape, i.e. does
         * not add any methods or considers intercepting inherited methods.
         */
        REDEFINE_LOCAL {
            /**
             * {@inheritDoc}
             * */
            public ByteBuddy byteBuddy(ClassFileVersion classFileVersion) {
                return new ByteBuddy(classFileVersion).with(Implementation.Context.Disabled.Factory.INSTANCE);
            }

            /**
             * {@inheritDoc}
             * */
            public DynamicType.Builder transform(TypeDescription typeDescription,
                                                    ByteBuddy byteBuddy,
                                                    ClassFileLocator classFileLocator,
                                                    MethodNameTransformer methodNameTransformer) {
                return byteBuddy.redefine(typeDescription, classFileLocator).ignoreAlso(not(isDeclaredBy(typeDescription)));
            }
        },

        /**
         * An entry point that decorates a type and which only offers limited support for transformation by only allowing
         * for the application of {@link net.bytebuddy.asm.AsmVisitorWrapper}s while improving performance.
         */
        DECORATE {
            /**
             * {@inheritDoc}
             * */
            public ByteBuddy byteBuddy(ClassFileVersion classFileVersion) {
                return new ByteBuddy(classFileVersion)
                        .with(MethodGraph.Compiler.ForDeclaredMethods.INSTANCE)
                        .with(Implementation.Context.Disabled.Factory.INSTANCE);
            }

            /**
             * {@inheritDoc}
             * */
            public DynamicType.Builder transform(TypeDescription typeDescription,
                                                    ByteBuddy byteBuddy,
                                                    ClassFileLocator classFileLocator,
                                                    MethodNameTransformer methodNameTransformer) {
                return byteBuddy.decorate(typeDescription, classFileLocator);
            }
        }
    }

    /**
     * An entry point that wraps another entry point but disables validation.
     */
    @HashCodeAndEqualsPlugin.Enhance
    class Unvalidated implements EntryPoint {

        /**
         * The entry point to use.
         */
        private final EntryPoint delegate;

        /**
         * Creates a new entry point with disabled validation.
         *
         * @param delegate The entry point to use.
         */
        public Unvalidated(EntryPoint delegate) {
            this.delegate = delegate;
        }

        /**
         * {@inheritDoc}
         */
        public ByteBuddy byteBuddy(ClassFileVersion classFileVersion) {
            return delegate.byteBuddy(classFileVersion).with(TypeValidation.DISABLED);
        }

        /**
         * {@inheritDoc}
         */
        public DynamicType.Builder transform(TypeDescription typeDescription,
                                                ByteBuddy byteBuddy,
                                                ClassFileLocator classFileLocator,
                                                MethodNameTransformer methodNameTransformer) {
            return delegate.transform(typeDescription, byteBuddy, classFileLocator, methodNameTransformer);
        }
    }
}