emulators/springcoat-vm/src/main/java/cc/squirreljme/vm/springcoat/SpringSimpleObject.java

   1 // -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
   2 // ---------------------------------------------------------------------------
   3 // SquirrelJME
   4 //     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
   5 // ---------------------------------------------------------------------------
   6 // SquirrelJME is under the GNU General Public License v3+, or later.
   7 // See license.mkd for licensing and copyright information.
   8 // ---------------------------------------------------------------------------
   9
  10 package cc.squirreljme.vm.springcoat;
  11
  12 import cc.squirreljme.vm.springcoat.brackets.RefLinkHolder;
  13 import cc.squirreljme.vm.springcoat.exceptions.SpringVirtualMachineException;
  14 import java.lang.ref.Reference;
  15 import java.lang.ref.WeakReference;
  16
  17 /**
  18  * This is a representation of an object within the virtual machine.
  19  *
  20  * @since 2018/09/08
  21  */
  22 public final class SpringSimpleObject
  23         implements SpringObject
  24 {
  25         /** The type of object this is. */
  26         protected final SpringClass type;
  27
  28         /** The monitor for this object, every object has one. */
  29         protected final SpringMonitor monitor =
  30                 new SpringMonitor();
  31
  32         /** The reference link holder. */
  33         protected final RefLinkHolder refLink =
  34                 new RefLinkHolder();
  35
  36         /** Field storage in the class. */
  37         final SpringFieldStorage[] _fields;
  38
  39         /** String representation. */
  40         private Reference<String> _string;
  41
  42         /**
  43          * Initializes the object.
  44          *
  45          * @param __cl The class of the object.
  46          * @throws NullPointerException On null arguments.
  47          * @since 2018/09/08
  48          */
  49         public SpringSimpleObject(SpringClass __cl)
  50                 throws NullPointerException
  51         {
  52                 if (__cl == null)
  53                         throw new NullPointerException("NARG");
  54
  55                 this.type = __cl;
  56
  57                 // Setup field array
  58                 int n;
  59                 SpringFieldStorage[] fields;
  60                 this._fields = (fields =
  61                         new SpringFieldStorage[(n = __cl.instanceFieldCount())]);
  62
  63                 // Initialize variable for all fields
  64                 int i = 0;
  65                 for (SpringField f : __cl.fieldTable())
  66                 {
  67                         int thisDx = i++;
  68                         fields[thisDx] = new SpringFieldStorage(f, f.index);
  69                 }
  70         }
  71
  72         /**
  73          * Returns the field by the given field.
  74          *
  75          * @param __f The field to get.
  76          * @return The storage for the field.
  77          * @throws NullPointerException On null arguments.
  78          * @since 2018/11/19
  79          */
  80         public final SpringFieldStorage fieldByField(SpringField __f)
  81                 throws NullPointerException
  82         {
  83                 if (__f == null)
  84                         throw new NullPointerException("NARG");
  85
  86                 return this.fieldByIndex(__f.index());
  87         }
  88
  89         /**
  90          * Returns the field by the given index.
  91          *
  92          * @param __dx The field to get.
  93          * @return The storage for the field by the specified index.
  94          * @since 2018/09/16
  95          */
  96         public final SpringFieldStorage fieldByIndex(int __dx)
  97         {
  98                 try
  99                 {
 100                         return this._fields[__dx];
 101                 }
 102                 catch (IndexOutOfBoundsException e)
 103                 {
 104                         throw new SpringVirtualMachineException(
 105                                 "Invalid field index: " + __dx, e);
 106                 }
 107         }
 108
 109         /**
 110          * Returns the field by the name and type.
 111          *
 112          * @param __static Is this field static?
 113          * @param __name The name of the field.
 114          * @param __type The type of the field.
 115          * @return The storage for the field.
 116          * @since 2020/06/17
 117          */
 118         public final SpringFieldStorage fieldByNameAndType(boolean __static,
 119                 String __name, String __type)
 120         {
 121                 return this.fieldByField(
 122                         this.type().lookupField(__static, __name, __type));
 123         }
 124
 125         /**
 126          * {@inheritDoc}
 127          * @since 2018/09/15
 128          */
 129         @Override
 130         public final SpringMonitor monitor()
 131         {
 132                 return this.monitor;
 133         }
 134
 135         /**
 136          * {@inheritDoc}
 137          * @since 2020/05/31
 138          */
 139         @Override
 140         public RefLinkHolder refLink()
 141         {
 142                 return this.refLink;
 143         }
 144
 145         /**
 146          * {@inheritDoc}
 147          * @since 2018/09/15
 148          */
 149         @Override
 150         public final String toString()
 151         {
 152                 Reference<String> ref = this._string;
 153                 String rv;
 154
 155                 if (ref == null || null == (rv = ref.get()))
 156                         this._string = new WeakReference<>((rv = String.format(
 157                                 "%s@%08x", this.type.name(), System.identityHashCode(this))));
 158
 159                 return rv;
 160         }
 161
 162         /**
 163          * {@inheritDoc}
 164          * @since 2018/09/09
 165          */
 166         @Override
 167         public final SpringClass type()
 168         {
 169                 return this.type;
 170         }
 171 }
 172