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.core.datatype; 028 029import gov.nist.secauto.metaschema.core.datatype.adapter.MetaschemaDataTypeProvider; 030 031import java.util.Collections; 032import java.util.LinkedList; 033import java.util.List; 034 035import edu.umd.cs.findbugs.annotations.NonNull; 036 037/** 038 * A base implementation of an {@link IDataTypeProvider}, supporting dynamic 039 * loading of Metaschema data type extensions at runtime. 040 * <p> 041 * The {@link MetaschemaDataTypeProvider} class provides an example of how to 042 * use this class to provide new data types. 043 */ 044public abstract class AbstractDataTypeProvider implements IDataTypeProvider { 045 private final List<IDataTypeAdapter<?>> library = new LinkedList<>(); 046 047 @SuppressWarnings("null") 048 @Override 049 public List<? extends IDataTypeAdapter<?>> getJavaTypeAdapters() { 050 synchronized (this) { 051 return Collections.unmodifiableList(library); 052 } 053 } 054 055 /** 056 * Register the provided {@code adapter} with the type system. 057 * 058 * @param adapter 059 * the adapter to register 060 * @throws IllegalArgumentException 061 * if another type adapter has no name 062 */ 063 protected void registerDatatype(@NonNull IDataTypeAdapter<?> adapter) { 064 if (adapter.getNames().size() == 0) { 065 throw new IllegalArgumentException("The adapter has no name: " + adapter.getClass().getName()); 066 } 067 synchronized (this) { 068 library.add(adapter); 069 } 070 } 071}