net.alantea.viewml.internal.Referencer Maven / Gradle / Ivy

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package net.alantea.viewml.internal;

import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;

import net.alantea.viewml.VmlException;
import net.alantea.viewml.handlers.TransparentHandler;

/**
 * The Class Referencer.
 */
public final class Referencer
{
   /** The reference map. */
   // Reference named objects
   private static Map referenceMap = new HashMap<>();
   
   /** The references. */
   private static LinkedList references = new LinkedList<>();

   /**
    * Instantiates a new referencer.
    */
   private Referencer()
   {
   }
   
   /**
    * Put a reference.
    *
    * @param name the name
    * @param newReference the object
    * @throws VmlException the TXML exception
    */
   public static void putReference(String name, Object newReference) throws VmlException
   {
      Object object = null;
      if (newReference != null)
      {
         object = newReference;
         if (newReference instanceof TransparentHandler)
         {
            object = ((TransparentHandler)newReference).getComponent();
         }
      }
      if (object != null)
      {
         referenceMap.put(name, object);
         ActionsLoader.addActionsFor(name, object);
         ChangesLoader.addChangesFor(name, object);
      }
   }

   /**
    * Get a reference.
    *
    * @param name the name
    * @return the reference
    * @throws VmlException the TXML exception
    */
   public static Object getReference(String name) throws VmlException
   {
      return referenceMap.get(name);
   }

   /**
    * Get a reference name.
    *
    * @param target the target
    * @return the reference
    * @throws VmlException the TXML exception
    */
   public static String getName(Object target) throws VmlException
   {
      for (Entry entry : referenceMap.entrySet())
      {
          if (Objects.equals(target, entry.getValue()))
          {
              return entry.getKey();
          }
      }
      throw new VmlException("Key not found");
   }

   /**
    * Get all reference keys.
    *
    * @return the references
    * @throws VmlException the TXML exception
    */
   public static Set getReferences() throws VmlException
   {
      return referenceMap.keySet();
   }
   
   /**
    * Push reference.
    *
    * @param reference the reference
    */
   public static void pushReference(String reference)
   {
      if (reference == null)
      {
         references.push(references.peek());
      }
      else
      {
         references.push(reference);
      }
   }
   
   /**
    * Pop reference.
    */
   public static void popReference()
   {
      references.pop();
   }
   
   /**
    * Peek reference.
    *
    * @return the string
    */
   public static String peekReference()
   {
      String ret = references.peek();
      return (ret == null) ? "" : ret;
   }
}