001/*
002 * Portions of this software was developed by employees of the National Institute
003 * of Standards and Technology (NIST), an agency of the Federal Government and is
004 * being made available as a public service. Pursuant to title 17 United States
005 * Code Section 105, works of NIST employees are not subject to copyright
006 * protection in the United States. This software may be subject to foreign
007 * copyright. Permission in the United States and in foreign countries, to the
008 * extent that NIST may hold copyright, to use, copy, modify, create derivative
009 * works, and distribute this software and its documentation without fee is hereby
010 * granted on a non-exclusive basis, provided that this notice and disclaimer
011 * of warranty appears in all copies.
012 *
013 * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
014 * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
015 * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
016 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
017 * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
018 * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE.  IN NO EVENT
019 * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
020 * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
021 * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
022 * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
023 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
024 * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
025 */
026
027package gov.nist.secauto.metaschema.databind.io.json;
028
029import com.fasterxml.jackson.core.JsonFactory;
030import com.fasterxml.jackson.core.JsonGenerator;
031import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
032
033import gov.nist.secauto.metaschema.core.configuration.IMutableConfiguration;
034import gov.nist.secauto.metaschema.core.util.ObjectUtils;
035import gov.nist.secauto.metaschema.databind.io.AbstractSerializer;
036import gov.nist.secauto.metaschema.databind.io.SerializationFeature;
037import gov.nist.secauto.metaschema.databind.model.IAssemblyClassBinding;
038
039import java.io.IOException;
040import java.io.Writer;
041
042import edu.umd.cs.findbugs.annotations.NonNull;
043
044public class DefaultJsonSerializer<CLASS>
045    extends AbstractSerializer<CLASS> {
046  private JsonFactory jsonFactory;
047
048  /**
049   * Construct a new Module binding-based deserializer that reads JSON-based
050   * Module content.
051   *
052   * @param classBinding
053   *          the assembly class binding describing the Java objects this
054   *          deserializer parses data into
055   */
056  public DefaultJsonSerializer(@NonNull IAssemblyClassBinding classBinding) {
057    super(classBinding);
058  }
059
060  /**
061   * Constructs a new JSON factory.
062   * <p>
063   * Subclasses can override this method to create a JSON factory with a specific
064   * configuration.
065   *
066   * @return the factory
067   */
068  @NonNull
069  protected JsonFactory getJsonFactoryInstance() {
070    return JsonFactoryFactory.instance();
071  }
072
073  @SuppressWarnings("PMD.NullAssignment")
074  @Override
075  protected void configurationChanged(IMutableConfiguration<SerializationFeature<?>> config) {
076    synchronized (this) {
077      jsonFactory = null;
078    }
079  }
080
081  @NonNull
082  private JsonFactory getJsonFactory() {
083    synchronized (this) {
084      if (jsonFactory == null) {
085        jsonFactory = getJsonFactoryInstance();
086      }
087      assert jsonFactory != null;
088      return jsonFactory;
089    }
090  }
091
092  @SuppressWarnings("resource")
093  @NonNull
094  private JsonGenerator newJsonGenerator(@NonNull Writer writer) throws IOException {
095    JsonFactory factory = getJsonFactory();
096    return ObjectUtils.notNull(factory.createGenerator(writer)
097        .setPrettyPrinter(new DefaultPrettyPrinter()));
098  }
099
100  @Override
101  public void serialize(CLASS data, Writer writer) throws IOException {
102    try (JsonGenerator generator = newJsonGenerator(writer)) {
103      IAssemblyClassBinding classBinding = getClassBinding();
104
105      MetaschemaJsonWriter jsonWriter = new MetaschemaJsonWriter(generator);
106
107      jsonWriter.write(classBinding, data);
108    }
109  }
110
111}