org.hobsoft.symmetry.spring.SymmetryMethodArgumentResolver.java Source code

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Here is the source code for org.hobsoft.symmetry.spring.SymmetryMethodArgumentResolver.java

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/*
 * 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 org.hobsoft.symmetry.spring;

import org.hobsoft.symmetry.Reflector;
import org.springframework.beans.BeanUtils;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

/**
 * Spring handler method argument resolver for UI components.
 * 
 * @param <T>
 *            the base component type
 */
public class SymmetryMethodArgumentResolver<T> implements HandlerMethodArgumentResolver {
    // ----------------------------------------------------------------------------------------------------------------
    // fields
    // ----------------------------------------------------------------------------------------------------------------

    private final Reflector<T> reflector;

    // ----------------------------------------------------------------------------------------------------------------
    // constructors
    // ----------------------------------------------------------------------------------------------------------------

    public SymmetryMethodArgumentResolver(Reflector<T> reflector) {
        this.reflector = reflector;
    }

    // ----------------------------------------------------------------------------------------------------------------
    // HandlerMethodArgumentResolver methods
    // ----------------------------------------------------------------------------------------------------------------

    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return reflector.getComponentType().isAssignableFrom(parameter.getParameterType());
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
            NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        Object target = BeanUtils.instantiateClass(parameter.getParameterType());
        T component = reflector.getComponentType().cast(target);

        reflector.absorb(component, webRequest.getParameterMap());

        return component;
    }
}