/*
    * Portions of this software was developed by employees of the National Institute
    * of Standards and Technology (NIST), an agency of the Federal Government and is
    * being made available as a public service. Pursuant to title 17 United States
    * Code Section 105, works of NIST employees are not subject to copyright
    * protection in the United States. This software may be subject to foreign
    * copyright. Permission in the United States and in foreign countries, to the
    * extent that NIST may hold copyright, to use, copy, modify, create derivative
    * works, and distribute this software and its documentation without fee is hereby
   * granted on a non-exclusive basis, provided that this notice and disclaimer
   * of warranty appears in all copies.
   *
   * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
   * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
   * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
   * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
   * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE.  IN NO EVENT
   * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
   * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
   * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
   * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
   * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
   * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
   */
  
  package gov.nist.secauto.metaschema.databind;
  
  import gov.nist.secauto.metaschema.core.model.IModule;
  import gov.nist.secauto.metaschema.core.util.CollectionUtil;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  import gov.nist.secauto.metaschema.databind.model.AbstractBoundModule;
  import gov.nist.secauto.metaschema.databind.model.DefaultAssemblyClassBinding;
  import gov.nist.secauto.metaschema.databind.model.DefaultFieldClassBinding;
  import gov.nist.secauto.metaschema.databind.model.IClassBinding;
  import gov.nist.secauto.metaschema.databind.model.annotations.MetaschemaAssembly;
  import gov.nist.secauto.metaschema.databind.model.annotations.MetaschemaField;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  
  class AbstractModuleLoaderStrategy implements IModuleLoaderStrategy {
    @NonNull
    private final IBindingContext bindingContext;
    @NonNull
    private final Map<Class<?>, IModule> modulesByClass = new HashMap<>(); // NOPMD - intentional
    @NonNull
    private final Map<Class<?>, IClassBinding> classBindingsByClass = new HashMap<>(); // NOPMD - intentional
  
    protected AbstractModuleLoaderStrategy(@NonNull IBindingContext bindingContext) {
      this.bindingContext = bindingContext;
    }
  
    @NonNull
    public IBindingContext getBindingContext() {
      return bindingContext;
    }
  
    @Override
    public IModule getModuleByClass(@NonNull Class<? extends IModule> clazz) {
      IModule retval;
      synchronized (this) {
        retval = modulesByClass.get(clazz);
        if (retval == null) {
          retval = AbstractBoundModule.createInstance(clazz, getBindingContext());
          modulesByClass.put(clazz, retval);
        }
      }
      return ObjectUtils.notNull(retval);
    }
  
    @Override
    public IClassBinding getClassBinding(@NonNull Class<?> clazz) {
      IClassBinding retval;
      synchronized (this) {
        retval = classBindingsByClass.get(clazz);
        if (retval == null) {
          retval = newClassBinding(clazz);
          if (retval != null) {
            classBindingsByClass.put(clazz, retval);
          }
        }
      }
      return retval;
    }
  
    @Nullable
    protected IClassBinding newClassBinding(@NonNull Class<?> clazz) {
      IClassBinding retval = null;
      if (clazz.isAnnotationPresent(MetaschemaAssembly.class)) {
        retval = DefaultAssemblyClassBinding.createInstance(clazz, getBindingContext());
      } else if (clazz.isAnnotationPresent(MetaschemaField.class)) {
        retval = DefaultFieldClassBinding.createInstance(clazz, getBindingContext());
      }
      return retval;
    }
 
   @Override
   public Map<Class<?>, IClassBinding> getClassBindingsByClass() {
     synchronized (this) {
       return CollectionUtil.unmodifiableMap(classBindingsByClass);
     }
   }
 }