net.kaczmarzyk.spring.data.jpa.web.EnhancerUtil.java Source code

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Here is the source code for net.kaczmarzyk.spring.data.jpa.web.EnhancerUtil.java

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/**
 * Copyright 2014-2016 the original author or authors.
 *
 * 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.kaczmarzyk.spring.data.jpa.web;

import java.lang.reflect.Method;

import org.springframework.cglib.proxy.Enhancer;
import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;
import org.springframework.data.jpa.domain.Specification;

/**
 * @author Tomasz Kaczmarzyk
 */
class EnhancerUtil {

    @SuppressWarnings("unchecked")
    static <T> T wrapWithIfaceImplementation(final Class<T> iface, final Specification<Object> targetSpec) {
        Enhancer enhancer = new Enhancer();
        enhancer.setInterfaces(new Class[] { iface });
        enhancer.setCallback(new MethodInterceptor() {
            @Override
            public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
                if ("toString".equals(method.getName())) {
                    return iface.getSimpleName() + "[" + proxy.invoke(targetSpec, args) + "]";
                }
                return proxy.invoke(targetSpec, args);
            }
        });

        return (T) enhancer.create();
    }
}