com.github.ljtfreitas.restify.spring.configure.RestifyConfigurationRegistrar.java Source code

Introduction

Here is the source code for com.github.ljtfreitas.restify.spring.configure.RestifyConfigurationRegistrar.java

Source

/*******************************************************************************
 *
 * 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.spring.configure;

import java.lang.annotation.Annotation;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;

import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.annotation.FilterType;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.core.type.filter.AspectJTypeFilter;
import org.springframework.core.type.filter.AssignableTypeFilter;
import org.springframework.core.type.filter.RegexPatternTypeFilter;
import org.springframework.core.type.filter.TypeFilter;

import com.github.ljtfreitas.restify.http.util.Tryable;

class RestifyConfigurationRegistrar extends BaseRestifyConfigurationRegistrar {

    private ResourceLoader resourceLoader;

    @Override
    public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) {
        EnableRestifyAnnotationAttributes attributes = new EnableRestifyAnnotationAttributes(
                metadata.getAnnotationAttributes(EnableRestify.class.getName(), true));

        RestifyableTypeScanner scanner = RestifyableTypeScanner.excluding(filters(attributes.exclude()));

        String[] packages = attributes.packages().length == 0 ? new String[] { packageOf(metadata.getClassName()) }
                : attributes.packages();

        doScan(Arrays.asList(packages), scanner, registry);
    }

    private String packageOf(String className) {
        return Tryable.of(() -> Class.forName(className)).getPackage().getName();
    }

    @SuppressWarnings("unchecked")
    private Set<TypeFilter> filters(RestifyExcludeFilter[] filters) {
        Set<TypeFilter> typeFilters = new LinkedHashSet<>();

        Arrays.stream(filters).forEach(f -> {
            Arrays.stream(f.classes()).forEach(classType -> {
                switch (f.type()) {
                case ANNOTATION: {
                    typeFilters.add(new AnnotationTypeFilter((Class<? extends Annotation>) classType));
                    break;
                }
                case ASSIGNABLE_TYPE: {
                    typeFilters.add(new AssignableTypeFilter(classType));
                    break;
                }
                case CUSTOM: {
                    typeFilters.add(Tryable.of(() -> (TypeFilter) classType.newInstance(),
                            () -> new IllegalArgumentException(
                                    "Cannot construct your custom TypeFilter of type [" + classType + "]")));
                }
                default: {
                    throw new IllegalArgumentException("Illegal @Filter use. "
                            + "Your configure [classes] attribute with filter type [" + f.type() + "]");
                }
                }
            });

            Arrays.stream(f.pattern()).forEach(pattern -> {
                switch (f.type()) {
                case REGEX: {
                    typeFilters.add(new RegexPatternTypeFilter(Pattern.compile(pattern)));
                }
                case ASPECTJ: {
                    typeFilters.add(new AspectJTypeFilter(pattern, resourceLoader.getClassLoader()));
                }
                default: {
                    throw new IllegalArgumentException("Illegal @Filter use. "
                            + "Your configure [pattern] attribute with filter type [" + f.type() + "]");
                }
                }
            });
        });

        return typeFilters;
    }

    private class EnableRestifyAnnotationAttributes {

        private final Map<String, Object> attributes;

        EnableRestifyAnnotationAttributes(Map<String, Object> attributes) {
            this.attributes = attributes;
        }

        String[] packages() {
            return (String[]) attributes.get("packages");
        }

        RestifyExcludeFilter[] exclude() {
            return Arrays.stream((AnnotationAttributes[]) attributes.get("exclude"))
                    .map(a -> new RestifyExcludeFilter(a)).toArray(RestifyExcludeFilter[]::new);
        }
    }

    private class RestifyExcludeFilter {

        private final AnnotationAttributes attributes;

        RestifyExcludeFilter(AnnotationAttributes attributes) {
            this.attributes = attributes;
        }

        Class<?>[] classes() {
            return Arrays.stream((String[]) attributes.get("classes"))
                    .map(name -> Tryable.of(() -> Class.forName(name))).toArray(Class<?>[]::new);
        }

        String[] pattern() {
            return (String[]) attributes.get("pattern");
        }

        FilterType type() {
            return (FilterType) attributes.get("type");
        }
    }
}