com.greensopinion.finance.services.web.Application.java Source code

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Here is the source code for com.greensopinion.finance.services.web.Application.java

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/*******************************************************************************
 * Copyright (c) 2015, 2016 David Green.
 *
 * 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 com.greensopinion.finance.services.web;

import java.lang.annotation.Annotation;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.inject.Inject;
import javax.ws.rs.Consumes;
import javax.ws.rs.Path;

import org.glassfish.hk2.api.ServiceLocator;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Binding;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provides;
import com.greensopinion.finance.services.application.Main;
import com.greensopinion.finance.services.web.ImportFilesWebService;

public class Application extends javax.ws.rs.core.Application {

    private final Injector injector;

    @Inject
    public Application(ServiceLocator serviceLocator) {
        injector = createInjector();
    }

    private Injector createInjector() {
        return Guice.createInjector(Main.applicationModules());
    }

    @Override
    public Set<Object> getSingletons() {
        ImmutableSet.Builder<Object> builder = ImmutableSet.<Object>builder();
        Map<Key<?>, Binding<?>> bindings = injector.getBindings();
        for (Key<?> key : bindings.keySet()) {
            if (hasAnnotation(key, ImmutableList.of(Path.class, Provides.class, Consumes.class))
                    && isEligible(key)) {
                builder.add(injector.getInstance(key));
            }
        }
        return builder.build();
    }

    private boolean isEligible(Key<?> key) {
        Class<?> type = key.getTypeLiteral().getRawType();
        return !ImportFilesWebService.class.isAssignableFrom(type);
    }

    private boolean hasAnnotation(Key<?> key, List<Class<? extends Annotation>> annotations) {
        Class<?> type = key.getTypeLiteral().getRawType();
        for (Class<? extends Annotation> annotation : annotations) {
            if (type.getAnnotation(annotation) != null) {
                return true;
            }
        }
        return false;
    }
}