org.mozilla.javascript

## Class NativeJavaObject

- java.lang.Object
- - org.mozilla.javascript.NativeJavaObject

- All Implemented Interfaces:
    java.io.Serializable, Scriptable, Wrapper
  Direct Known Subclasses:
    NativeJavaArray, NativeJavaClass

      public class NativeJavaObject
      extends java.lang.Object
      implements Scriptable, Wrapper, java.io.Serializable

  This class reflects non-Array Java objects into the JavaScript environment. It reflect fields directly, and uses NativeJavaMethod objects to reflect (possibly overloaded) methods.

  Author:
    Mike Shaver
  See Also:
    `NativeJavaArray`, `NativeJavaPackage`, `NativeJavaClass`, Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected boolean` | `isAdapter`
    `protected java.lang.Object` | `javaObject`
    `protected org.mozilla.javascript.JavaMembers` | `members`
    `protected Scriptable` | `parent` The parent scope of this object.
    `protected Scriptable` | `prototype` The prototype of this object.
    `protected java.lang.Class<?>` | `staticType`

    - ### Fields inherited from interface org.mozilla.javascript.Scriptable

      `NOT_FOUND`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `NativeJavaObject()`
    `NativeJavaObject(Scriptable scope, java.lang.Object javaObject, java.lang.Class<?> staticType)`
    `NativeJavaObject(Scriptable scope, java.lang.Object javaObject, java.lang.Class<?> staticType, boolean isAdapter)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static boolean` | `canConvert(java.lang.Object fromObj, java.lang.Class<?> to)` Determine whether we can/should convert between the given type and the desired one.
    `static java.lang.Object` | `coerceType(java.lang.Class<?> type, java.lang.Object value)` Deprecated. as of 1.5 Release 4
    `protected static java.lang.Object` | `createInterfaceAdapter(java.lang.Class<?> type, ScriptableObject so)`
    `void` | `delete(int index)` Removes a property from this object.
    `void` | `delete(java.lang.String name)` Removes a property from this object.
    `java.lang.Object` | `get(int index, Scriptable start)` Get a property from the object selected by an integral index.
    `java.lang.Object` | `get(java.lang.String name, Scriptable start)` Get a named property from the object.
    `java.lang.String` | `getClassName()` Get the name of the set of objects implemented by this Java class.
    `java.lang.Object` | `getDefaultValue(java.lang.Class<?> hint)` Get the default value of the object with a given hint.
    `java.lang.Object[]` | `getIds()` Get an array of property ids.
    `Scriptable` | `getParentScope()` Returns the parent (enclosing) scope of the object.
    `Scriptable` | `getPrototype()` Get the prototype of the object.
    `boolean` | `has(int index, Scriptable start)` Indicates whether or not an indexed property is defined in an object.
    `boolean` | `has(java.lang.String name, Scriptable start)` Indicates whether or not a named property is defined in an object.
    `boolean` | `hasInstance(Scriptable value)` The instanceof operator.
    `protected void` | `initMembers()`
    `void` | `put(int index, Scriptable start, java.lang.Object value)` Sets an indexed property in this object.
    `void` | `put(java.lang.String name, Scriptable start, java.lang.Object value)` Sets a named property in this object.
    `void` | `setParentScope(Scriptable m)` Sets the parent (enclosing) scope of the object.
    `void` | `setPrototype(Scriptable m)` Sets the prototype of the object.
    `java.lang.Object` | `unwrap()` Unwrap the object by returning the wrapped value.
    `static java.lang.Object` | `wrap(Scriptable scope, java.lang.Object obj, java.lang.Class<?> staticType)` Deprecated. Use `Context.getWrapFactory()` together with calling `WrapFactory.wrap(Context, Scriptable, Object, Class)`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### prototype

          protected Scriptable prototype

      The prototype of this object.

    - #### parent

          protected Scriptable parent

      The parent scope of this object.

    - #### javaObject

          protected transient java.lang.Object javaObject

    - #### staticType

          protected transient java.lang.Class<?> staticType

    - #### members

          protected transient org.mozilla.javascript.JavaMembers members

    - #### isAdapter

          protected transient boolean isAdapter

  - ### Constructor Detail

    - #### NativeJavaObject

          public NativeJavaObject()

    - #### NativeJavaObject

          public NativeJavaObject(Scriptable scope,
                          java.lang.Object javaObject,
                          java.lang.Class<?> staticType)

    - #### NativeJavaObject

          public NativeJavaObject(Scriptable scope,
                          java.lang.Object javaObject,
                          java.lang.Class<?> staticType,
                          boolean isAdapter)

  - ### Method Detail

    - #### initMembers

          protected void initMembers()

    - #### has

          public boolean has(java.lang.String name,
                    Scriptable start)

      Description copied from interface: `Scriptable`
      Indicates whether or not a named property is defined in an object. Does not traverse the prototype chain.

      The property is specified by a String name as defined for the `get` method.

      Specified by:
        `has` in interface `Scriptable`
      Parameters:
        `name` - the name of the property
        `start` - the object in which the lookup began
      Returns:
        true if and only if the named property is found in the object
      See Also:
        `Scriptable.get(String, Scriptable)`, `ScriptableObject.getProperty(Scriptable, String)`

    - #### has

          public boolean has(int index,
                    Scriptable start)

      Description copied from interface: `Scriptable`
      Indicates whether or not an indexed property is defined in an object. Does not traverse the prototype chain.

      The property is specified by an integral index as defined for the `get` method.

      Specified by:
        `has` in interface `Scriptable`
      Parameters:
        `index` - the numeric index for the property
        `start` - the object in which the lookup began
      Returns:
        true if and only if the indexed property is found in the object
      See Also:
        `Scriptable.get(int, Scriptable)`, `ScriptableObject.getProperty(Scriptable, int)`

    - #### get

          public java.lang.Object get(java.lang.String name,
                             Scriptable start)

      Description copied from interface: `Scriptable`
      Get a named property from the object. Looks property up in this object and returns the associated value if found. Returns NOT_FOUND if not found. Note that this method is not expected to traverse the prototype chain. This is different from the ECMA [[Get]] operation. Depending on the property selector, the runtime will call this method or the form of `get` that takes an integer:

      JavaScript code | Java code
      --- | ---
      a.b | a.get("b", a)
      a["foo"] | a.get("foo", a)
      a[3] | a.get(3, a)
      a["3"] | a.get(3, a)
      a[3.0] | a.get(3, a)
      a["3.0"] | a.get("3.0", a)
      a[1.1] | a.get("1.1", a)
      a[-4] | a.get(-4, a)

      The values that may be returned are limited to the following:

      - java.lang.Boolean objects
      - java.lang.String objects
      - java.lang.Number objects
      - org.mozilla.javascript.Scriptable objects
      - null
      - The value returned by Context.getUndefinedValue()
      - NOT_FOUND
      Specified by:
        `get` in interface `Scriptable`
      Parameters:
        `name` - the name of the property
        `start` - the object in which the lookup began
      Returns:
        the value of the property (may be null), or NOT_FOUND
      See Also:
        `Context.getUndefinedValue()`

    - #### get

          public java.lang.Object get(int index,
                             Scriptable start)

      Description copied from interface: `Scriptable`
      Get a property from the object selected by an integral index. Identical to `get(String, Scriptable)` except that an integral index is used to select the property.
      Specified by:
        `get` in interface `Scriptable`
      Parameters:
        `index` - the numeric index for the property
        `start` - the object in which the lookup began
      Returns:
        the value of the property (may be null), or NOT_FOUND
      See Also:
        `Scriptable.get(String,Scriptable)`

    - #### put

          public void put(java.lang.String name,
                 Scriptable start,
                 java.lang.Object value)

      Description copied from interface: `Scriptable`
      Sets a named property in this object.

      The property is specified by a string name as defined for `get`.

      The possible values that may be passed in are as defined for `get`. A class that implements this method may choose to ignore calls to set certain properties, in which case those properties are effectively read-only.

      For properties defined in a prototype chain, use `putProperty` in ScriptableObject.

      Note that if a property a is defined in the prototype p of an object o, then evaluating `o.a = 23` will cause `set` to be called on the prototype p with o as the start parameter. To preserve JavaScript semantics, it is the Scriptable object's responsibility to modify o.

      This design allows properties to be defined in prototypes and implemented in terms of getters and setters of Java values without consuming slots in each instance.

      The values that may be set are limited to the following:

      - java.lang.Boolean objects
      - java.lang.String objects
      - java.lang.Number objects
      - org.mozilla.javascript.Scriptable objects
      - null
      - The value returned by Context.getUndefinedValue()

      Arbitrary Java objects may be wrapped in a Scriptable by first calling `Context.toObject`. This allows the property of a JavaScript object to contain an arbitrary Java object as a value.

      Note that `has` will be called by the runtime first before `set` is called to determine in which object the property is defined. Note that this method is not expected to traverse the prototype chain, which is different from the ECMA [[Put]] operation.

      Specified by:
        `put` in interface `Scriptable`
      Parameters:
        `name` - the name of the property
        `start` - the object whose property is being set
        `value` - value to set the property to
      See Also:
        `Scriptable.has(String, Scriptable)`, `Scriptable.get(String, Scriptable)`, `ScriptableObject.putProperty(Scriptable, String, Object)`, `Context.toObject(Object, Scriptable)`

    - #### put

          public void put(int index,
                 Scriptable start,
                 java.lang.Object value)

      Description copied from interface: `Scriptable`
      Sets an indexed property in this object.

      The property is specified by an integral index as defined for `get`.

      Identical to `put(String, Scriptable, Object)` except that an integral index is used to select the property.

      Specified by:
        `put` in interface `Scriptable`
      Parameters:
        `index` - the numeric index for the property
        `start` - the object whose property is being set
        `value` - value to set the property to
      See Also:
        `Scriptable.has(int, Scriptable)`, `Scriptable.get(int, Scriptable)`, `ScriptableObject.putProperty(Scriptable, int, Object)`, `Context.toObject(Object, Scriptable)`

    - #### hasInstance

          public boolean hasInstance(Scriptable value)

      Description copied from interface: `Scriptable`
      The instanceof operator.

      The JavaScript code "lhs instanceof rhs" causes rhs.hasInstance(lhs) to be called.

      The return value is implementation dependent so that embedded host objects can return an appropriate value. See the JS 1.3 language documentation for more detail.

      This operator corresponds to the proposed EMCA [[HasInstance]] operator.

      Specified by:
        `hasInstance` in interface `Scriptable`
      Parameters:
        `value` - The value that appeared on the LHS of the instanceof operator
      Returns:
        an implementation dependent value

    - #### delete

          public void delete(java.lang.String name)

      Description copied from interface: `Scriptable`
      Removes a property from this object. This operation corresponds to the ECMA [[Delete]] except that the no result is returned. The runtime will guarantee that this method is called only if the property exists. After this method is called, the runtime will call Scriptable.has to see if the property has been removed in order to determine the boolean result of the delete operator as defined by ECMA 11.4.1.

      A property can be made permanent by ignoring calls to remove it.

      The property is specified by a String name as defined for `get`.

      To delete properties defined in a prototype chain, see deleteProperty in ScriptableObject.

      Specified by:
        `delete` in interface `Scriptable`
      Parameters:
        `name` - the identifier for the property
      See Also:
        `Scriptable.get(String, Scriptable)`, `ScriptableObject.deleteProperty(Scriptable, String)`

    - #### delete

          public void delete(int index)

      Description copied from interface: `Scriptable`
      Removes a property from this object. The property is specified by an integral index as defined for `get`.

      To delete properties defined in a prototype chain, see deleteProperty in ScriptableObject. Identical to `delete(String)` except that an integral index is used to select the property.

      Specified by:
        `delete` in interface `Scriptable`
      Parameters:
        `index` - the numeric index for the property
      See Also:
        `Scriptable.get(int, Scriptable)`, `ScriptableObject.deleteProperty(Scriptable, int)`

    - #### getPrototype

          public Scriptable getPrototype()

      Description copied from interface: `Scriptable`
      Get the prototype of the object.
      Specified by:
        `getPrototype` in interface `Scriptable`
      Returns:
        the prototype

    - #### setPrototype

          public void setPrototype(Scriptable m)

      Sets the prototype of the object.
      Specified by:
        `setPrototype` in interface `Scriptable`
      Parameters:
        `m` - the prototype to set

    - #### getParentScope

          public Scriptable getParentScope()

      Returns the parent (enclosing) scope of the object.
      Specified by:
        `getParentScope` in interface `Scriptable`
      Returns:
        the parent scope

    - #### setParentScope

          public void setParentScope(Scriptable m)

      Sets the parent (enclosing) scope of the object.
      Specified by:
        `setParentScope` in interface `Scriptable`
      Parameters:
        `m` - the parent scope to set

    - #### getIds

          public java.lang.Object[] getIds()

      Description copied from interface: `Scriptable`
      Get an array of property ids. Not all property ids need be returned. Those properties whose ids are not returned are considered non-enumerable.
      Specified by:
        `getIds` in interface `Scriptable`
      Returns:
        an array of Objects. Each entry in the array is either a java.lang.String or a java.lang.Number

    - #### wrap

          public static java.lang.Object wrap(Scriptable scope,
                              java.lang.Object obj,
                              java.lang.Class<?> staticType)

      Deprecated. Use `Context.getWrapFactory()` together with calling `WrapFactory.wrap(Context, Scriptable, Object, Class)`

    - #### unwrap

          public java.lang.Object unwrap()

      Description copied from interface: `Wrapper`
      Unwrap the object by returning the wrapped value.
      Specified by:
        `unwrap` in interface `Wrapper`
      Returns:
        a wrapped value

    - #### getClassName

          public java.lang.String getClassName()

      Description copied from interface: `Scriptable`
      Get the name of the set of objects implemented by this Java class. This corresponds to the [[Class]] operation in ECMA and is used by Object.prototype.toString() in ECMA.

      See ECMA 8.6.2 and 15.2.4.2.

      Specified by:
        `getClassName` in interface `Scriptable`

    - #### getDefaultValue

          public java.lang.Object getDefaultValue(java.lang.Class<?> hint)

      Description copied from interface: `Scriptable`
      Get the default value of the object with a given hint. The hints are String.class for type String, Number.class for type Number, Scriptable.class for type Object, and Boolean.class for type Boolean.

      A `hint` of null means "no hint". See ECMA 8.6.2.6.

      Specified by:
        `getDefaultValue` in interface `Scriptable`
      Parameters:
        `hint` - the type hint
      Returns:
        the default value

    - #### canConvert

          public static boolean canConvert(java.lang.Object fromObj,
                           java.lang.Class<?> to)

      Determine whether we can/should convert between the given type and the desired one. This should be superceded by a conversion-cost calculation function, but for now I'll hide behind precedent.

    - #### coerceType

          public static java.lang.Object coerceType(java.lang.Class<?> type,
                                    java.lang.Object value)

      Deprecated. as of 1.5 Release 4
      Not intended for public use. Callers should use the public API Context.toType.
      See Also:
        `Context.jsToJava(Object, Class)`

    - #### createInterfaceAdapter

          protected static java.lang.Object createInterfaceAdapter(java.lang.Class<?> type,
                                                ScriptableObject so)