org.smartdeveloperhub.vocabulary.config.ConfigurationFactory.java Source code

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Here is the source code for org.smartdeveloperhub.vocabulary.config.ConfigurationFactory.java

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/**
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   This file is part of the Smart Developer Hub Project:
 *     http://www.smartdeveloperhub.org/
 *
 *   Center for Open Middleware
 *     http://www.centeropenmiddleware.com/
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Copyright (C) 2015-2016 Center for Open Middleware.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   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.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Artifact    : org.smartdeveloperhub.vocabulary:sdh-vocabulary:0.3.0
 *   Bundle      : sdh-vocabulary-0.3.0.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.smartdeveloperhub.vocabulary.config;

import static com.google.common.base.Preconditions.checkArgument;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.net.URL;

import org.yaml.snakeyaml.Yaml;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
import com.fasterxml.jackson.dataformat.yaml.YAMLGenerator;

public final class ConfigurationFactory {
    private ConfigurationFactory() {
    }

    private static YAMLFactory yamlFactory() {
        return new YAMLFactory().disable(YAMLGenerator.Feature.WRITE_DOC_START_MARKER)
                .disable(YAMLGenerator.Feature.CANONICAL_OUTPUT).enable(YAMLGenerator.Feature.SPLIT_LINES)
                .enable(YAMLGenerator.Feature.MINIMIZE_QUOTES).enable(YAMLGenerator.Feature.USE_NATIVE_OBJECT_ID)
                .enable(YAMLGenerator.Feature.USE_NATIVE_TYPE_ID);
    }

    private static ObjectMapper parsingMapper() {
        return new ObjectMapper(yamlFactory());
    }

    private static ObjectMapper writingMapper() {
        final YAMLFactory factory = yamlFactory();
        factory.enable(JsonGenerator.Feature.ESCAPE_NON_ASCII);
        final ObjectMapper mapper = new ObjectMapper(factory);
        mapper.enable(SerializationFeature.INDENT_OUTPUT);
        return mapper;
    }

    static <T extends Configuration> T load(final URL url, final Class<? extends T> clazz) throws IOException {
        final ObjectMapper mapper = parsingMapper();
        try (InputStream openStream = url.openStream()) {
            return mapper.readValue(openStream, clazz);
        }
    }

    static <T> T convert(final Object source, final Type type) {
        final ObjectMapper mapper = parsingMapper();
        final JavaType constructType = mapper.getTypeFactory().constructType(type);
        checkArgument(mapper.canDeserialize(constructType), "%s is not a valid configuration class",
                constructType.toCanonical());
        return mapper.convertValue(source, constructType);
    }

    public static <T extends Configuration> T load(final String value, final Class<? extends T> clazz)
            throws IOException {
        final Yaml yaml = new Yaml();
        final Object load = yaml.load(value);
        return convert(load, clazz);
    }

    public static Configuration load(final String value) throws IOException {
        return load(value, Configuration.class);
    }

    public static String save(final Configuration config) throws IOException {
        return writingMapper().writeValueAsString(config);
    }

}