/*
* Copyright (c) 2002-2010 Gargoyle Software Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.gargoylesoftware.htmlunit.javascript.host;
import net.sourceforge.htmlunit.corejs.javascript.BaseFunction;
import net.sourceforge.htmlunit.corejs.javascript.Context;
import net.sourceforge.htmlunit.corejs.javascript.Function;
import net.sourceforge.htmlunit.corejs.javascript.JavaScriptException;
import net.sourceforge.htmlunit.corejs.javascript.Scriptable;
import com.gargoylesoftware.htmlunit.html.DomNode;
import com.gargoylesoftware.htmlunit.javascript.SimpleScriptable;
/**
* Allows to wrap event handler code as Function object.
*
* @version $Revision: 5301 $
* @author Marc Guillemot
*/
public class EventHandler extends BaseFunction {
private static final long serialVersionUID = 3257850965406068787L;
private final DomNode node_;
private final String eventName_;
private final String jsSnippet_;
private Function realFunction_;
/**
* Builds a function that will execute the JavaScript code provided.
* @param node the element for which the event is build
* @param eventName the event for which this handler is created
* @param jsSnippet the JavaScript code
*/
public EventHandler(final DomNode node, final String eventName, final String jsSnippet) {
node_ = node;
eventName_ = eventName;
final String functionSignature;
if (node.getPage().getEnclosingWindow().getWebClient().getBrowserVersion().isIE()) {
functionSignature = "function()";
}
else {
functionSignature = "function(event)";
}
jsSnippet_ = functionSignature + " {" + jsSnippet + "\n}";
final Window w = (Window) node.getPage().getEnclosingWindow().getScriptObject();
final Scriptable function = (Scriptable) w.get("Function", w);
setPrototype(function.getPrototype());
}
/**
* {@inheritDoc}
*/
@Override
public Object call(final Context cx, final Scriptable scope,
final Scriptable thisObj, final Object[] args)
throws JavaScriptException {
// the js object to which this event is attached has to be the scope
final SimpleScriptable jsObj = (SimpleScriptable) node_.getScriptObject();
// compile "just in time"
if (realFunction_ == null) {
realFunction_ = cx.compileFunction(jsObj, jsSnippet_, eventName_ + " event for " + node_
+ " in " + node_.getPage().getWebResponse().getRequestSettings().getUrl(), 0, null);
}
final Object result = realFunction_.call(cx, scope, thisObj, args);
return result;
}
/**
* @see net.sourceforge.htmlunit.corejs.javascript.ScriptableObject#getDefaultValue(java.lang.Class)
* @param typeHint the type hint
* @return the js code of the function declaration
*/
@Override
public Object getDefaultValue(final Class< ? > typeHint) {
return jsSnippet_;
}
/**
* {@inheritDoc}
*/
@Override
public Object get(final String name, final Scriptable start) {
// quick and dirty
if ("toString".equals(name)) {
return new BaseFunction() {
//checkstyle bug: http://sourceforge.net/tracker/?func=detail&atid=397078&aid=2853482&group_id=29721
//private static final long serialVersionUID = 3761409724511435061L;
@Override
public Object call(final Context cx, final Scriptable scope,
final Scriptable thisObj, final Object[] args) {
return jsSnippet_;
}
};
}
return super.get(name, start);
}
}