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## org.mozilla.jrex.liveconnect
Class JRexLiveConnectSessionImpl

    java.lang.Object
      org.mozilla.jrex.liveconnect.JRexLiveConnectSessionImpl

All Implemented Interfaces:
  JRexLiveConnectSession

public final class JRexLiveConnectSessionImpl
extends Object
implements JRexLiveConnectSession

Implementation of JRexLiveConnectSession. JRexLiveConnectSessionImpl is public for accesibility from jni.

See Also:
  `JRexLiveConnectSession`

Constructor Summary
`JRexLiveConnectSessionImpl()` Creates an instance of JRexLiveConnectSessionImpl.
`JRexLiveConnectSessionImpl(JRexCanvas browser)` Creates an instance of JRexLiveConnectSessionImpl and invokes setBrowser.

Method Summary
`boolean` | `equals(Object obj)`
`String` | `evalUntrusted(String script)` Evaluates javascript in the browser.
`protected void` | `finalize()`
`int` | `getJRexPeerID()`
`netscape.javascript.JSObject` | `getJSWindow()` Retrieves a JSObject implementation for the JRexCanvas window.
`int` | `getSessionID()`
`void` | `grantBrowserAccessToJVM()` Makes the LiveConnectSession a 2-way session.
`int` | `hashCode()`
`String` | `invokeStringMethod(String functionName, String arg)` Invokes a javascript method which accepts a single string and returns a string.
`void` | `setBrowser(JRexCanvas browser)` Sets the browser and intializes live connect for the browser.

Methods inherited from class java.lang.Object
`clone, getClass, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### JRexLiveConnectSessionImpl

    public JRexLiveConnectSessionImpl()

  Creates an instance of JRexLiveConnectSessionImpl. The method `setBrowser(org.mozilla.jrex.ui.JRexCanvas)` must be called before any javascript can be invoked.

### JRexLiveConnectSessionImpl

    public JRexLiveConnectSessionImpl(JRexCanvas browser)
                               throws JRexException

  Creates an instance of JRexLiveConnectSessionImpl and invokes setBrowser.

Parameters:
  `browser` - the JRexCanvas used to access javascript
Throws:
  `JRexException` - if an error occurs while initializing the javascript bridge.

Method Detail

### getSessionID

    public int getSessionID()

### getJRexPeerID

    public int getJRexPeerID()

### equals

    public boolean equals(Object obj)

### hashCode

    public int hashCode()

### finalize

    protected void finalize()

### setBrowser

    public void setBrowser(JRexCanvas browser)
                    throws JRexException

  Description copied from interface: `JRexLiveConnectSession`
  Sets the browser and intializes live connect for the browser.

  Specified by:
    `setBrowser` in interface `JRexLiveConnectSession`
  Parameters:
    `browser` - the JRexCanvas, which must already be initialized
  Throws:
    `JRexException` - if an error occurs while initializing live connect

### grantBrowserAccessToJVM

    public void grantBrowserAccessToJVM()
                                 throws JRexException

  Description copied from interface: `JRexLiveConnectSession`
  Makes the LiveConnectSession a 2-way session. Before this method is called, the LiveConnect session is only one-way, meaning that Java can call into javascript using any of the methods defined in this interface except for `JRexLiveConnectSession.getJSWindow()`. After this method is invoked, the javascript will be able to create java objects and invoke methods on those objects, and the caller will be able to use the method `JRexLiveConnectSession.getJSWindow()` to retrieve the JSObject instance for the javascript window.

  Only call this method if the web page loaded into the JRexCanvas is trusted.

  Specified by:
    `grantBrowserAccessToJVM` in interface `JRexLiveConnectSession`
  Throws:
    `JRexException` - if an error occurs while granting access to the JRex JVM

### invokeStringMethod

    public String invokeStringMethod(String functionName,
                                     String arg)
                              throws JRexException

  Description copied from interface: `JRexLiveConnectSession`
  Invokes a javascript method which accepts a single string and returns a string. This method is provided as a simple way of invoking a javascript method and is useful for testing the JRexLiveConnectSession code. Note that for more complex javascript evaulations, the method `JRexLiveConnectSession.evalUntrusted(java.lang.String)` should be used for untrusted javascript, and the JSObject class returned from `JRexLiveConnectSession.getJSWindow()` should be used for trusted javascript.

  Specified by:
    `invokeStringMethod` in interface `JRexLiveConnectSession`
  Parameters:
    `functionName` - the name of the javascript function
    `arg` - the argument to pass to the javascript function
  Returns:
    the result from the javascript function call, or null if the call failed
  Throws:
    `JRexException` - if an error occurs while invoking the javascript
  See Also:
    `JRexLiveConnectSession.getJSWindow()`

### evalUntrusted

    public String evalUntrusted(String script)
                         throws JRexException

  Description copied from interface: `JRexLiveConnectSession`
  Evaluates javascript in the browser. This method will evaluate unstrusted javascript and return the string result. If the javascript is trusted, it is better to call `JRexLiveConnectSession.grantBrowserAccessToJVM()` followed by `JRexLiveConnectSession.getJSWindow()` and invoke the eval method on the JSObject instance. Only use this method if the javascript is not trusted.

  Specified by:
    `evalUntrusted` in interface `JRexLiveConnectSession`
  Parameters:
    `script` - the javascript to evaluate
  Returns:
    the result of the evaulation as a string
  Throws:
    `JRexException` - if an error occurs while evaulating

### getJSWindow

    public netscape.javascript.JSObject getJSWindow()
                                             throws JRexException

  Description copied from interface: `JRexLiveConnectSession`
  Retrieves a JSObject implementation for the JRexCanvas window. The return JSObject can be used to make function calls and evaluate javascript. This method must be invoked after the document has been fully loaded into the browser. Failure to do so will result in unexpected errors.

  Note that this method will throw a security violation exception unless the method `JRexLiveConnectSession.grantBrowserAccessToJVM()` is invoked before this method. Make sure to invoke `JRexLiveConnectSession.grantBrowserAccessToJVM()` before invoking this method.

  Specified by:
    `getJSWindow` in interface `JRexLiveConnectSession`
  Returns:
    a JSObject for invoking and manipulating javascript
  Throws:
    `JRexException` - if an error prevents the JSObject from being created
  See Also:
    `JRexLiveConnectSession.grantBrowserAccessToJVM()`

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Copyright © 2004 C.N.Medappa. All Rights Reserved.