com.github.ljtfreitas.restify.http.spring.contract.metadata.reflection.SpringWebJavaMethodMetadata.java Source code

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Here is the source code for com.github.ljtfreitas.restify.http.spring.contract.metadata.reflection.SpringWebJavaMethodMetadata.java

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/*******************************************************************************
 *
 * MIT License
 *
 * Copyright (c) 2016 Tiago de Freitas Lima
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *******************************************************************************/
package com.github.ljtfreitas.restify.http.spring.contract.metadata.reflection;

import static com.github.ljtfreitas.restify.http.util.Preconditions.isTrue;

import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Optional;

import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.github.ljtfreitas.restify.http.contract.metadata.reflection.JavaTypeResolver;

public class SpringWebJavaMethodMetadata {

    private final Method javaMethod;
    private final SpringWebRequestMappingMetadata mapping;

    public SpringWebJavaMethodMetadata(Method javaMethod) {
        this.javaMethod = javaMethod;

        RequestMapping mapping = Optional
                .ofNullable(AnnotatedElementUtils.findMergedAnnotation(javaMethod, RequestMapping.class))
                .orElseThrow(() -> new IllegalArgumentException(
                        "Method [" + javaMethod + "] does not have a @RequestMapping annotation."));

        isTrue(mapping.value().length <= 1, "Only single path is allowed.");
        isTrue(mapping.method().length == 1,
                "You must set the HTTP method (only one!) of your Java method [" + javaMethod + "].");

        this.mapping = new SpringWebRequestMappingMetadata(mapping);
    }

    public Optional<String> path() {
        return mapping.path();
    }

    public RequestMethod httpMethod() {
        return mapping.method()[0];
    }

    public Type returnType(Class<?> rawType) {
        return new JavaTypeResolver(rawType).returnTypeOf(javaMethod);
    }

    public String[] headers() {
        return mapping.headers();
    }
}