com.google.cloud.tools.eclipse.appengine.libraries.AppEngineLibraries.java Source code

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Here is the source code for com.google.cloud.tools.eclipse.appengine.libraries.AppEngineLibraries.java

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/*
 * Copyright 2017 Google Inc.
 *
 * 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.google.cloud.tools.eclipse.appengine.libraries;

import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.RegistryFactory;

import com.google.cloud.tools.eclipse.appengine.libraries.model.Library;
import com.google.cloud.tools.eclipse.appengine.libraries.model.LibraryFactory;
import com.google.cloud.tools.eclipse.appengine.libraries.model.LibraryFactoryException;
import com.google.common.collect.ImmutableMap;

public class AppEngineLibraries {

    /**
     * Library files for App Engine Standard environment applications; specifically
     * Objectify, App Engine API, and Google Cloud Endpoints.
     */
    public static final String APP_ENGINE_GROUP = "appengine";

    /**
     * Library files for all Java servlet applications; specifically
     * servlet.jar and jsp-api.jar.
     */
    public static final String SERVLET_GROUP = "servlet";

    private static final Logger logger = Logger.getLogger(AppEngineLibraries.class.getName());
    private static final ImmutableMap<String, Library> libraries = loadLibraryDefinitions();

    // todo consider caching maps of group to libraries
    /**
     * @return libraries in the named group
     */
    public static List<Library> getLibraries(String group) {
        List<Library> result = new ArrayList<>();
        for (Library library : libraries.values()) {
            if (library.getGroup().equals(group)) {
                result.add(library);
            }
        }
        return result;
    }

    /**
     * @return the library with the specified ID, or null if not found
     */
    public static Library getLibrary(String id) {
        return libraries.get(id);
    }

    private static ImmutableMap<String, Library> loadLibraryDefinitions() {
        IConfigurationElement[] elements = RegistryFactory.getRegistry()
                .getConfigurationElementsFor("com.google.cloud.tools.eclipse.appengine.libraries");
        LibraryFactory factory = new LibraryFactory();
        ImmutableMap.Builder<String, Library> builder = ImmutableMap.builder();
        for (IConfigurationElement element : elements) {
            try {
                Library library = factory.create(element);
                builder.put(library.getId(), library);
            } catch (LibraryFactoryException ex) {
                logger.log(Level.SEVERE, "Error loading library definition", ex);
            }
        }
        return builder.build();
    }
}