private static double toDouble(Object value) {
   if (value instanceof Number) {
     return ((Number) value).doubleValue();
   } else if (value instanceof String) {
     return ScriptRuntime.toNumber((String) value);
   } else if (value instanceof Scriptable) {
     if (value instanceof Wrapper) {
       // XXX: optimize tail-recursion?
       return toDouble(((Wrapper) value).unwrap());
     } else {
       return ScriptRuntime.toNumber(value);
     }
   } else {
     Method meth;
     try {
       meth = value.getClass().getMethod("doubleValue", (Class[]) null);
     } catch (NoSuchMethodException e) {
       meth = null;
     } catch (SecurityException e) {
       meth = null;
     }
     if (meth != null) {
       try {
         return ((Number) meth.invoke(value, (Object[]) null)).doubleValue();
       } catch (IllegalAccessException e) {
         // XXX: ignore, or error message?
         reportConversionError(value, Double.TYPE);
       } catch (InvocationTargetException e) {
         // XXX: ignore, or error message?
         reportConversionError(value, Double.TYPE);
       }
     }
     return ScriptRuntime.toNumber(value.toString());
   }
 }
Esempio n. 2
0
 public static Object convertArg(Context cx, Scriptable scope, Object arg, int typeTag) {
   switch (typeTag) {
     case JAVA_STRING_TYPE:
       if (arg instanceof String) {
         return arg;
       }
       return ScriptRuntime.toString(arg);
     case JAVA_INT_TYPE:
       if (arg instanceof Integer) {
         return arg;
       }
       return new Integer(ScriptRuntime.toInt32(arg));
     case JAVA_BOOLEAN_TYPE:
       if (arg instanceof Boolean) {
         return arg;
       }
       return ScriptRuntime.toBoolean(arg) ? Boolean.TRUE : Boolean.FALSE;
     case JAVA_DOUBLE_TYPE:
       if (arg instanceof Double) {
         return arg;
       }
       return new Double(ScriptRuntime.toNumber(arg));
     case JAVA_SCRIPTABLE_TYPE:
       if (arg instanceof Scriptable) {
         return arg;
       }
       return ScriptRuntime.toObject(cx, scope, arg);
     case JAVA_OBJECT_TYPE:
       return arg;
     default:
       throw new IllegalArgumentException();
   }
 }
 public Object getDefaultValue(Class<?> hint) {
   Object value;
   if (hint == null) {
     if (javaObject instanceof Boolean) {
       hint = ScriptRuntime.BooleanClass;
     }
   }
   if (hint == null || hint == ScriptRuntime.StringClass) {
     value = javaObject.toString();
   } else {
     String converterName;
     if (hint == ScriptRuntime.BooleanClass) {
       converterName = "booleanValue";
     } else if (hint == ScriptRuntime.NumberClass) {
       converterName = "doubleValue";
     } else {
       throw Context.reportRuntimeError0("msg.default.value");
     }
     Object converterObject = get(converterName, this);
     if (converterObject instanceof Function) {
       Function f = (Function) converterObject;
       value = f.call(Context.getContext(), f.getParentScope(), this, ScriptRuntime.emptyArgs);
     } else {
       if (hint == ScriptRuntime.NumberClass && javaObject instanceof Boolean) {
         boolean b = ((Boolean) javaObject).booleanValue();
         value = ScriptRuntime.wrapNumber(b ? 1.0 : 0.0);
       } else {
         value = javaObject.toString();
       }
     }
   }
   return value;
 }
Esempio n. 4
0
  static Object js_createAdpter(Context cx, Scriptable scope, Object[] args) {
    int N = args.length;
    if (N == 0) {
      throw ScriptRuntime.typeError0("msg.adapter.zero.args");
    }

    Class superClass = null;
    Class[] intfs = new Class[N - 1];
    int interfaceCount = 0;
    for (int i = 0; i != N - 1; ++i) {
      Object arg = args[i];
      if (!(arg instanceof NativeJavaClass)) {
        throw ScriptRuntime.typeError2(
            "msg.not.java.class.arg", String.valueOf(i), ScriptRuntime.toString(arg));
      }
      Class c = ((NativeJavaClass) arg).getClassObject();
      if (!c.isInterface()) {
        if (superClass != null) {
          throw ScriptRuntime.typeError2("msg.only.one.super", superClass.getName(), c.getName());
        }
        superClass = c;
      } else {
        intfs[interfaceCount++] = c;
      }
    }

    if (superClass == null) superClass = ScriptRuntime.ObjectClass;

    Class[] interfaces = new Class[interfaceCount];
    System.arraycopy(intfs, 0, interfaces, 0, interfaceCount);
    Scriptable obj = ScriptRuntime.toObject(cx, scope, args[N - 1]);

    Class adapterClass = getAdapterClass(scope, superClass, interfaces, obj);

    Class[] ctorParms = {ScriptRuntime.ContextFactoryClass, ScriptRuntime.ScriptableClass};
    Object[] ctorArgs = {cx.getFactory(), obj};
    try {
      Object adapter = adapterClass.getConstructor(ctorParms).newInstance(ctorArgs);
      return getAdapterSelf(adapterClass, adapter);
    } catch (Exception ex) {
      throw Context.throwAsScriptRuntimeEx(ex);
    }
  }
  private static long toInteger(Object value, Class<?> type, double min, double max) {
    double d = toDouble(value);

    if (Double.isInfinite(d) || Double.isNaN(d)) {
      // Convert to string first, for more readable message
      reportConversionError(ScriptRuntime.toString(value), type);
    }

    if (d > 0.0) {
      d = Math.floor(d);
    } else {
      d = Math.ceil(d);
    }

    if (d < min || d > max) {
      // Convert to string first, for more readable message
      reportConversionError(ScriptRuntime.toString(value), type);
    }
    return (long) d;
  }
Esempio n. 6
0
 /**
  * Take an object from the scripting layer and convert it to an int.
  *
  * @param obj
  * @return int
  */
 private int toInt(Object obj) {
   int result = 0;
   if (obj instanceof String) {
     result = Integer.parseInt((String) obj);
   } else if (obj instanceof Number) {
     result = ((Number) obj).intValue();
   } else if (obj instanceof Scriptable) {
     Scriptable sobj = (Scriptable) obj;
     if (sobj.getClassName().equals("Number")) {
       result = (int) ScriptRuntime.toNumber(sobj);
     }
   }
   return result;
 }
Esempio n. 7
0
  public static Function getFunction(Scriptable obj, String functionName) {
    Object x = ScriptableObject.getProperty(obj, functionName);
    if (x == Scriptable.NOT_FOUND) {
      // This method used to swallow the exception from calling
      // an undefined method. People have come to depend on this
      // somewhat dubious behavior. It allows people to avoid
      // implementing listener methods that they don't care about,
      // for instance.
      return null;
    }
    if (!(x instanceof Function)) throw ScriptRuntime.notFunctionError(x, functionName);

    return (Function) x;
  }
Esempio n. 8
0
  /**
   * Define this function as a JavaScript constructor.
   *
   * <p>Sets up the "prototype" and "constructor" properties. Also calls setParent and setPrototype
   * with appropriate values. Then adds the function object as a property of the given scope, using
   * <code>prototype.getClassName()</code> as the name of the property.
   *
   * @param scope the scope in which to define the constructor (typically the global object)
   * @param prototype the prototype object
   * @see gov.nbcs.rp.common.js.javascript.Scriptable#setParentScope
   * @see gov.nbcs.rp.common.js.javascript.Scriptable#setPrototype
   * @see gov.nbcs.rp.common.js.javascript.Scriptable#getClassName
   */
  public void addAsConstructor(Scriptable scope, Scriptable prototype) {
    ScriptRuntime.setFunctionProtoAndParent(this, scope);
    setImmunePrototypeProperty(prototype);

    prototype.setParentScope(this);

    final int attr =
        ScriptableObject.DONTENUM | ScriptableObject.PERMANENT | ScriptableObject.READONLY;
    defineProperty(prototype, "constructor", this, attr);

    String name = prototype.getClassName();
    defineProperty(scope, name, this, ScriptableObject.DONTENUM);

    setParentScope(scope);
  }
Esempio n. 9
0
 private static ObjToIntMap getObjectFunctionNames(Scriptable obj) {
   Object[] ids = ScriptableObject.getPropertyIds(obj);
   ObjToIntMap map = new ObjToIntMap(ids.length);
   for (int i = 0; i != ids.length; ++i) {
     if (!(ids[i] instanceof String)) continue;
     String id = (String) ids[i];
     Object value = ScriptableObject.getProperty(obj, id);
     if (value instanceof Function) {
       Function f = (Function) value;
       int length = ScriptRuntime.toInt32(ScriptableObject.getProperty(f, "length"));
       if (length < 0) {
         length = 0;
       }
       map.put(id, length);
     }
   }
   return map;
 }
Esempio n. 10
0
 /**
  * Utility method to construct type error to indicate incompatible call when converting script
  * thisObj to a particular type is not possible. Possible usage would be to have a private
  * function like realThis:
  *
  * <pre>
  *  private static NativeSomething realThis(Scriptable thisObj,
  *                                          IdFunctionObject f)
  *  {
  *      if (!(thisObj instanceof NativeSomething))
  *          throw incompatibleCallError(f);
  *      return (NativeSomething)thisObj;
  * }
  * </pre>
  *
  * Note that although such function can be implemented universally via
  * java.lang.Class.isInstance(), it would be much more slower.
  *
  * @param f function that is attempting to convert 'this' object.
  * @return Scriptable object suitable for a check by the instanceof operator.
  * @throws RuntimeException if no more instanceof target can be found
  */
 protected static EcmaError incompatibleCallError(IdFunctionObject f) {
   throw ScriptRuntime.typeError1("msg.incompat.call", f.getFunctionName());
 }
Esempio n. 11
0
  /**
   * Performs conversions on argument types if needed and invokes the underlying Java method or
   * constructor.
   *
   * <p>Implements Function.call.
   *
   * @see gov.nbcs.rp.common.js.javascript.Function#call( Context, Scriptable, Scriptable, Object[])
   */
  public Object call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
    Object result;
    boolean checkMethodResult = false;

    if (parmsLength < 0) {
      if (parmsLength == VARARGS_METHOD) {
        Object[] invokeArgs = {cx, thisObj, args, this};
        result = member.invoke(null, invokeArgs);
        checkMethodResult = true;
      } else {
        boolean inNewExpr = (thisObj == null);
        Boolean b = inNewExpr ? Boolean.TRUE : Boolean.FALSE;
        Object[] invokeArgs = {cx, args, this, b};
        result =
            (member.isCtor()) ? member.newInstance(invokeArgs) : member.invoke(null, invokeArgs);
      }

    } else {
      if (!isStatic) {
        Class clazz = member.getDeclaringClass();
        if (!clazz.isInstance(thisObj)) {
          boolean compatible = false;
          if (thisObj == scope) {
            Scriptable parentScope = getParentScope();
            if (scope != parentScope) {
              // Call with dynamic scope for standalone function,
              // use parentScope as thisObj
              compatible = clazz.isInstance(parentScope);
              if (compatible) {
                thisObj = parentScope;
              }
            }
          }
          if (!compatible) {
            // Couldn't find an object to call this on.
            throw ScriptRuntime.typeError1("msg.incompat.call", functionName);
          }
        }
      }

      Object[] invokeArgs;
      if (parmsLength == args.length) {
        // Do not allocate new argument array if java arguments are
        // the same as the original js ones.
        invokeArgs = args;
        for (int i = 0; i != parmsLength; ++i) {
          Object arg = args[i];
          Object converted = convertArg(cx, scope, arg, typeTags[i]);
          if (arg != converted) {
            if (invokeArgs == args) {
              invokeArgs = (Object[]) args.clone();
            }
            invokeArgs[i] = converted;
          }
        }
      } else if (parmsLength == 0) {
        invokeArgs = ScriptRuntime.emptyArgs;
      } else {
        invokeArgs = new Object[parmsLength];
        for (int i = 0; i != parmsLength; ++i) {
          Object arg = (i < args.length) ? args[i] : Undefined.instance;
          invokeArgs[i] = convertArg(cx, scope, arg, typeTags[i]);
        }
      }

      if (member.isMethod()) {
        result = member.invoke(thisObj, invokeArgs);
        checkMethodResult = true;
      } else {
        result = member.newInstance(invokeArgs);
      }
    }

    if (checkMethodResult) {
      if (hasVoidReturn) {
        result = Undefined.instance;
      } else if (returnTypeTag == JAVA_UNSUPPORTED_TYPE) {
        result = cx.getWrapFactory().wrap(cx, scope, result, null);
      }
      // XXX: the code assumes that if returnTypeTag == JAVA_OBJECT_TYPE
      // then the Java method did a proper job of converting the
      // result to JS primitive or Scriptable to avoid
      // potentially costly Context.javaToJS call.
    }

    return result;
  }
Esempio n. 12
0
  /**
   * Create a JavaScript function object from a Java method.
   *
   * <p>The <code>member</code> argument must be either a java.lang.reflect.Method
   * or a java.lang.reflect.Constructor and must match one of two forms.<p>
   *
   * The first form is a member with zero or more parameters
   * of the following types: Object, String, boolean, Scriptable,
   * int, or double. The Long type is not supported
   * because the double representation of a long (which is the
   * EMCA-mandated storage type for Numbers) may lose precision.
   * If the member is a Method, the return value must be void or one
   * of the types allowed for parameters.<p>
   *
   * The runtime will perform appropriate conversions based
   * upon the type of the parameter. A parameter type of
   * Object specifies that no conversions are to be done. A parameter
   * of type String will use Context.toString to convert arguments.
   * Similarly, parameters of type double, boolean, and Scriptable
   * will cause Context.toNumber, Context.toBoolean, and
   * Context.toObject, respectively, to be called.<p>
   *
   * If the method is not static, the Java 'this' value will
   * correspond to the JavaScript 'this' value. Any attempt
   * to call the function with a 'this' value that is not
   * of the right Java type will result in an error.<p>
   *
   * The second form is the variable arguments (or "varargs")
   * form. If the FunctionObject will be used as a constructor,
   * the member must have the following parameters
   * <pre>
   *      (Context cx, Object[] args, Function ctorObj,
   *       boolean inNewExpr)</pre>
   * and if it is a Method, be static and return an Object result.<p>
   *
   * Otherwise, if the FunctionObject will <i>not</i> be used to define a
   * constructor, the member must be a static Method with parameters
   *      (Context cx, Scriptable thisObj, Object[] args,
   *       Function funObj) </pre>
   * <pre>
   * and an Object result.<p>
   *
   * When the function varargs form is called as part of a function call,
   * the <code>args</code> parameter contains the
   * arguments, with <code>thisObj</code>
   * set to the JavaScript 'this' value. <code>funObj</code>
   * is the function object for the invoked function.<p>
   *
   * When the constructor varargs form is called or invoked while evaluating
   * a <code>new</code> expression, <code>args</code> contains the
   * arguments, <code>ctorObj</code> refers to this FunctionObject, and
   * <code>inNewExpr</code> is true if and only if  a <code>new</code>
   * expression caused the call. This supports defining a function that
   * has different behavior when called as a constructor than when
   * invoked as a normal function call. (For example, the Boolean
   * constructor, when called as a function,
   * will convert to boolean rather than creating a new object.)<p>
   *
   * @param name the name of the function
   * @param methodOrConstructor a java.lang.reflect.Method or a java.lang.reflect.Constructor
   *                            that defines the object
   * @param scope enclosing scope of function
   * @see gov.nbcs.rp.common.js.javascript.Scriptable
   */
  public FunctionObject(String name, Member methodOrConstructor, Scriptable scope) {
    if (methodOrConstructor instanceof Constructor) {
      member = new MemberBox((Constructor) methodOrConstructor);
      isStatic = true; // well, doesn't take a 'this'
    } else {
      member = new MemberBox((Method) methodOrConstructor);
      isStatic = member.isStatic();
    }
    String methodName = member.getName();
    this.functionName = name;
    Class[] types = member.argTypes;
    int arity = types.length;
    if ((arity == 4) && (types[1].isArray() || types[2].isArray())) {
      // Either variable args or an error.
      if (types[1].isArray()) {
        if (!isStatic
            || (types[0] != ScriptRuntime.ContextClass)
            || (types[1].getComponentType() != ScriptRuntime.ObjectClass)
            || (types[2] != ScriptRuntime.FunctionClass)
            || (types[3] != Boolean.TYPE)) {
          throw Context.reportRuntimeError1("msg.varargs.ctor", methodName);
        }
        parmsLength = VARARGS_CTOR;
      } else {
        if (!isStatic
            || (types[0] != ScriptRuntime.ContextClass)
            || (types[1] != ScriptRuntime.ScriptableClass)
            || (types[2].getComponentType() != ScriptRuntime.ObjectClass)
            || (types[3] != ScriptRuntime.FunctionClass)) {
          throw Context.reportRuntimeError1("msg.varargs.fun", methodName);
        }
        parmsLength = VARARGS_METHOD;
      }
    } else {
      parmsLength = arity;
      if (arity > 0) {
        typeTags = new byte[arity];
        for (int i = 0; i != arity; ++i) {
          int tag = getTypeTag(types[i]);
          if (tag == JAVA_UNSUPPORTED_TYPE) {
            throw Context.reportRuntimeError2("msg.bad.parms", types[i].getName(), methodName);
          }
          typeTags[i] = (byte) tag;
        }
      }
    }

    if (member.isMethod()) {
      Method method = member.method();
      Class returnType = method.getReturnType();
      if (returnType == Void.TYPE) {
        hasVoidReturn = true;
      } else {
        returnTypeTag = getTypeTag(returnType);
      }
    } else {
      Class ctorType = member.getDeclaringClass();
      if (!ScriptRuntime.ScriptableClass.isAssignableFrom(ctorType)) {
        throw Context.reportRuntimeError1("msg.bad.ctor.return", ctorType.getName());
      }
    }

    ScriptRuntime.setFunctionProtoAndParent(this, scope);
  }
Esempio n. 13
0
  static Object js_createAdapter(Context cx, Scriptable scope, Object[] args) {
    int N = args.length;
    if (N == 0) {
      throw ScriptRuntime.typeError0("msg.adapter.zero.args");
    }

    // Expected arguments:
    // Any number of NativeJavaClass objects representing the super-class
    // and/or interfaces to implement, followed by one NativeObject providing
    // the implementation, followed by any number of arguments to pass on
    // to the (super-class) constructor.

    int classCount;
    for (classCount = 0; classCount < N - 1; classCount++) {
      Object arg = args[classCount];
      // We explicitly test for NativeObject here since checking for
      // instanceof ScriptableObject or !(instanceof NativeJavaClass)
      // would fail for a Java class that isn't found in the class path
      // as NativeJavaPackage extends ScriptableObject.
      if (arg instanceof NativeObject) {
        break;
      }
      if (!(arg instanceof NativeJavaClass)) {
        throw ScriptRuntime.typeError2(
            "msg.not.java.class.arg", String.valueOf(classCount), ScriptRuntime.toString(arg));
      }
    }
    Class<?> superClass = null;
    Class<?>[] intfs = new Class[classCount];
    int interfaceCount = 0;
    for (int i = 0; i < classCount; ++i) {
      Class<?> c = ((NativeJavaClass) args[i]).getClassObject();
      if (!c.isInterface()) {
        if (superClass != null) {
          throw ScriptRuntime.typeError2("msg.only.one.super", superClass.getName(), c.getName());
        }
        superClass = c;
      } else {
        intfs[interfaceCount++] = c;
      }
    }

    if (superClass == null) {
      superClass = ScriptRuntime.ObjectClass;
    }

    Class<?>[] interfaces = new Class[interfaceCount];
    System.arraycopy(intfs, 0, interfaces, 0, interfaceCount);
    // next argument is implementation, must be scriptable
    Scriptable obj = ScriptableObject.ensureScriptable(args[classCount]);

    Class<?> adapterClass = getAdapterClass(scope, superClass, interfaces, obj);
    Object adapter;

    int argsCount = N - classCount - 1;
    try {
      if (argsCount > 0) {
        // Arguments contain parameters for super-class constructor.
        // We use the generic Java method lookup logic to find and
        // invoke the right constructor.
        Object[] ctorArgs = new Object[argsCount + 2];
        ctorArgs[0] = obj;
        ctorArgs[1] = cx.getFactory();
        System.arraycopy(args, classCount + 1, ctorArgs, 2, argsCount);
        // TODO: cache class wrapper?
        NativeJavaClass classWrapper = new NativeJavaClass(scope, adapterClass, true);
        NativeJavaMethod ctors = classWrapper.members.ctors;
        int index = ctors.findCachedFunction(cx, ctorArgs);
        if (index < 0) {
          String sig = NativeJavaMethod.scriptSignature(args);
          throw Context.reportRuntimeError2("msg.no.java.ctor", adapterClass.getName(), sig);
        }

        // Found the constructor, so try invoking it.
        adapter = NativeJavaClass.constructInternal(ctorArgs, ctors.methods[index]);
      } else {
        Class<?>[] ctorParms = {ScriptRuntime.ScriptableClass, ScriptRuntime.ContextFactoryClass};
        Object[] ctorArgs = {obj, cx.getFactory()};
        adapter = adapterClass.getConstructor(ctorParms).newInstance(ctorArgs);
      }

      Object self = getAdapterSelf(adapterClass, adapter);
      // Return unwrapped JavaAdapter if it implements Scriptable
      if (self instanceof Wrapper) {
        Object unwrapped = ((Wrapper) self).unwrap();
        if (unwrapped instanceof Scriptable) {
          if (unwrapped instanceof ScriptableObject) {
            ScriptRuntime.setObjectProtoAndParent((ScriptableObject) unwrapped, scope);
          }
          return unwrapped;
        }
      }
      return self;
    } catch (Exception ex) {
      throw Context.throwAsScriptRuntimeEx(ex);
    }
  }
  /** Type-munging for field setting and method invocation. Conforms to LC3 specification */
  static Object coerceTypeImpl(Class<?> type, Object value) {
    if (value != null && value.getClass() == type) {
      return value;
    }

    switch (getJSTypeCode(value)) {
      case JSTYPE_NULL:
        // raise error if type.isPrimitive()
        if (type.isPrimitive()) {
          reportConversionError(value, type);
        }
        return null;

      case JSTYPE_UNDEFINED:
        if (type == ScriptRuntime.StringClass || type == ScriptRuntime.ObjectClass) {
          return "undefined";
        } else {
          reportConversionError("undefined", type);
        }
        break;

      case JSTYPE_BOOLEAN:
        // Under LC3, only JS Booleans can be coerced into a Boolean value
        if (type == Boolean.TYPE
            || type == ScriptRuntime.BooleanClass
            || type == ScriptRuntime.ObjectClass) {
          return value;
        } else if (type == ScriptRuntime.StringClass) {
          return value.toString();
        } else {
          reportConversionError(value, type);
        }
        break;

      case JSTYPE_NUMBER:
        if (type == ScriptRuntime.StringClass) {
          return ScriptRuntime.toString(value);
        } else if (type == ScriptRuntime.ObjectClass) {
          return coerceToNumber(Double.TYPE, value);
        } else if ((type.isPrimitive() && type != Boolean.TYPE)
            || ScriptRuntime.NumberClass.isAssignableFrom(type)) {
          return coerceToNumber(type, value);
        } else {
          reportConversionError(value, type);
        }
        break;

      case JSTYPE_STRING:
        if (type == ScriptRuntime.StringClass || type.isInstance(value)) {
          return value;
        } else if (type == Character.TYPE || type == ScriptRuntime.CharacterClass) {
          // Special case for converting a single char string to a
          // character
          // Placed here because it applies *only* to JS strings,
          // not other JS objects converted to strings
          if (((String) value).length() == 1) {
            return new Character(((String) value).charAt(0));
          } else {
            return coerceToNumber(type, value);
          }
        } else if ((type.isPrimitive() && type != Boolean.TYPE)
            || ScriptRuntime.NumberClass.isAssignableFrom(type)) {
          return coerceToNumber(type, value);
        } else {
          reportConversionError(value, type);
        }
        break;

      case JSTYPE_JAVA_CLASS:
        if (value instanceof Wrapper) {
          value = ((Wrapper) value).unwrap();
        }

        if (type == ScriptRuntime.ClassClass || type == ScriptRuntime.ObjectClass) {
          return value;
        } else if (type == ScriptRuntime.StringClass) {
          return value.toString();
        } else {
          reportConversionError(value, type);
        }
        break;

      case JSTYPE_JAVA_OBJECT:
      case JSTYPE_JAVA_ARRAY:
        if (value instanceof Wrapper) {
          value = ((Wrapper) value).unwrap();
        }
        if (type.isPrimitive()) {
          if (type == Boolean.TYPE) {
            reportConversionError(value, type);
          }
          return coerceToNumber(type, value);
        } else {
          if (type == ScriptRuntime.StringClass) {
            return value.toString();
          } else {
            if (type.isInstance(value)) {
              return value;
            } else {
              reportConversionError(value, type);
            }
          }
        }
        break;

      case JSTYPE_OBJECT:
        if (type == ScriptRuntime.StringClass) {
          return ScriptRuntime.toString(value);
        } else if (type.isPrimitive()) {
          if (type == Boolean.TYPE) {
            reportConversionError(value, type);
          }
          return coerceToNumber(type, value);
        } else if (type.isInstance(value)) {
          return value;
        } else if (type == ScriptRuntime.DateClass && value instanceof NativeDate) {
          double time = ((NativeDate) value).getJSTimeValue();
          // XXX: This will replace NaN by 0
          return new Date((long) time);
        } else if (type.isArray() && value instanceof NativeArray) {
          // Make a new java array, and coerce the JS array components
          // to the target (component) type.
          NativeArray array = (NativeArray) value;
          long length = array.getLength();
          Class<?> arrayType = type.getComponentType();
          Object Result = Array.newInstance(arrayType, (int) length);
          for (int i = 0; i < length; ++i) {
            try {
              Array.set(Result, i, coerceType(arrayType, array.get(i, array)));
            } catch (EvaluatorException ee) {
              reportConversionError(value, type);
            }
          }

          return Result;
        } else if (value instanceof Wrapper) {
          value = ((Wrapper) value).unwrap();
          if (type.isInstance(value)) return value;
          reportConversionError(value, type);
        } else if (type.isInterface() && value instanceof Callable) {
          // Try to use function as implementation of Java interface.
          //
          // XXX: Currently only instances of ScriptableObject are
          // supported since the resulting interface proxies should
          // be reused next time conversion is made and generic
          // Callable has no storage for it. Weak references can
          // address it but for now use this restriction.
          if (value instanceof ScriptableObject) {
            ScriptableObject so = (ScriptableObject) value;
            Object key = Kit.makeHashKeyFromPair(COERCED_INTERFACE_KEY, type);
            Object old = so.getAssociatedValue(key);
            if (old != null) {
              // Function was already wrapped
              return old;
            }
            Context cx = Context.getContext();
            Object glue = InterfaceAdapter.create(cx, type, (Callable) value);
            // Store for later retrival
            glue = so.associateValue(key, glue);
            return glue;
          }
          reportConversionError(value, type);
        } else {
          reportConversionError(value, type);
        }
        break;
    }

    return value;
  }