HTMLAbstractUIElement.java

package org.cobra_grendel.html.domimpl;

import java.util.HashMap;
import java.util.Map;

import org.cobra_grendel.html.UserAgentContext;
import org.cobra_grendel.html.js.Executor;
import org.cobra_grendel.js.JavaScript;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.EcmaError;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;
import org.w3c.dom.Document;

/**
 * Implements common functionality of most elements.
 */
public class HTMLAbstractUIElement extends HTMLElementImpl
{
    /**
	 * 
	 */
    private static final long serialVersionUID = 1L;

    private Map functionByAttribute = null;

    private Function onfocus, onblur, onclick, ondblclick, onmousedown, onmouseup, onmouseover, onmousemove, onmouseout, onkeypress, onkeydown, onkeyup;

    public HTMLAbstractUIElement(final String name, final int transactionId)
    {
        super(name, transactionId);
    }

    @Override
    protected void assignAttributeField(final String normalName, final String value)
    {
        super.assignAttributeField(normalName, value);
        if (normalName.startsWith("on"))
        {
            synchronized (this)
            {
                Map fba = functionByAttribute;
                if (fba != null)
                {
                    fba.remove(normalName);
                }
            }
        }
    }

    public void blur()
    {
        UINode node = getUINode();
        if (node != null)
        {
            node.blur();
        }
    }

    public void focus()
    {
        UINode node = getUINode();
        if (node != null)
        {
            node.focus();
        }
    }

    protected Function getEventFunction(final Function varValue, final String attributeName)
    {
        if (varValue != null)
        {
            return varValue;
        }
        String normalAttributeName = normalizeAttributeName(attributeName);
        synchronized (this)
        {
            Map fba = functionByAttribute;
            Function f = fba == null ? null : (Function) fba.get(normalAttributeName);
            if (f != null)
            {
                return f;
            }
            UserAgentContext uac = getUserAgentContext();
            if (uac == null)
            {
                throw new IllegalStateException("No user agent context.");
            }
            if (uac.isScriptingEnabled())
            {
                String attributeValue = getAttribute(attributeName);
                if (attributeValue == null || attributeValue.length() == 0)
                {
                    f = null;
                }
                else
                {
                    String functionCode = "function " + normalAttributeName + "_" + System.identityHashCode(this) + "() { " + attributeValue + " }";
                    Document doc = document;
                    if (doc == null)
                    {
                        throw new IllegalStateException("Element does not belong to a document.");
                    }
                    Context ctx = Executor.createContext(getDocumentURL(), uac);
                    try
                    {
                        Scriptable scope = (Scriptable) doc.getUserData(Executor.SCOPE_KEY);
                        if (scope == null)
                        {
                            throw new IllegalStateException("Scriptable (scope) instance was expected to be keyed as UserData to document using " + Executor.SCOPE_KEY);
                        }
                        Scriptable thisScope = (Scriptable) JavaScript.getInstance().getJavascriptObject(this, scope);
                        try
                        {
                            // TODO: Get right line number for script. //TODO:
                            // Optimize this in case it's called multiple times?
                            // Is that done?
                            f = ctx.compileFunction(thisScope, functionCode, getTagName() + "[" + getId() + "]." + attributeName, 1, null);
                        }
                        catch (EcmaError ecmaError)
                        {
                            this.warn("Javascript error at " + ecmaError.getSourceName() + ":" + ecmaError.getLineNumber() + ": " + ecmaError.getMessage());
                            f = null;
                        }
                        catch (Throwable err)
                        {
                            this.warn("Unable to evaluate Javascript code", err);
                            f = null;
                        }
                    }
                    finally
                    {
                        Context.exit();
                    }
                }
                if (fba == null)
                {
                    fba = new HashMap(1);
                    functionByAttribute = fba;
                }
                fba.put(normalAttributeName, f);
            }
            return f;
        }
    }

    public Function getOnblur()
    {
        return getEventFunction(onblur, "onblur");
    }

    public Function getOnclick()
    {
        return getEventFunction(onclick, "onclick");
    }

    public Function getOndblclick()
    {
        return getEventFunction(ondblclick, "ondblclick");
    }

    public Function getOnfocus()
    {
        return getEventFunction(onfocus, "onfocus");
    }

    public Function getOnkeydown()
    {
        return getEventFunction(onkeydown, "onkeydown");
    }

    public Function getOnkeypress()
    {
        return getEventFunction(onkeypress, "onkeypress");
    }

    public Function getOnkeyup()
    {
        return getEventFunction(onkeyup, "onkeyup");
    }

    public Function getOnmousedown()
    {
        return getEventFunction(onmousedown, "onmousedown");
    }

    public Function getOnmousemove()
    {
        return getEventFunction(onmousemove, "onmousemove");
    }

    public Function getOnmouseout()
    {
        return getEventFunction(onmouseout, "onmouseout");
    }

    public Function getOnmouseover()
    {
        return getEventFunction(onmouseover, "onmouseover");
    }

    public Function getOnmouseup()
    {
        return getEventFunction(onmouseup, "onmouseup");
    }

    public void setOnblur(final Function onblur)
    {
        this.onblur = onblur;
    }

    public void setOnclick(final Function onclick)
    {
        this.onclick = onclick;
    }

    public void setOndblclick(final Function ondblclick)
    {
        this.ondblclick = ondblclick;
    }

    public void setOnfocus(final Function onfocus)
    {
        this.onfocus = onfocus;
    }

    public void setOnkeydown(final Function onkeydown)
    {
        this.onkeydown = onkeydown;
    }

    public void setOnkeypress(final Function onkeypress)
    {
        this.onkeypress = onkeypress;
    }

    public void setOnkeyup(final Function onkeyup)
    {
        this.onkeyup = onkeyup;
    }

    public void setOnmousedown(final Function onmousedown)
    {
        this.onmousedown = onmousedown;
    }

    public void setOnmousemove(final Function onmousemove)
    {
        this.onmousemove = onmousemove;
    }

    public void setOnmouseout(final Function onmouseout)
    {
        this.onmouseout = onmouseout;
    }

    public void setOnmouseover(final Function onmouseover)
    {
        this.onmouseover = onmouseover;
    }

    public void setOnmouseup(final Function onmouseup)
    {
        this.onmouseup = onmouseup;
    }
}