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| package com.cap.tree.action;
import java.util.Hashtable;
import com.cc.framework.adapter.struts.ActionContext;
import com.cc.framework.adapter.struts.FormActionContext;
import com.cc.framework.common.Algorithm;
import com.cc.framework.common.CheckState;
import com.cc.framework.ui.control.ControlActionContext;
import com.cc.framework.ui.control.TreeControl;
import com.cc.framework.ui.model.Checkable;
import com.cc.framework.ui.model.TreeNodeDataModel;
import com.cc.framework.util.TreeHelp;
import com.cc.sample.action.CCAction;
import com.cc.sample.common.Forwards;
import com.cc.sample.common.Messages;
import com.cc.sample.dbaccess.DBProduct;
import com.cc.sample.presentation.dsp.ProductGroupDsp;
/**
* This Class is responsible to instantiate our TreeControl.
* This Class also implements the Methode which are called if
* an Event in our TreeControl occurs.
*
* @author <a href="mailto:gschulz@scc-gmbh.com">Gernot Schulz</a>
* @version $Revision: 1.7 $
*/
public class ProductTreeBrowseAction extends CCAction {
/**
* The name of the bean for our control in the session
*/
protected String BEANNAME;
/**
* Inner class which checks the checked items
*/
private static class CollectCheckedAlg implements Algorithm {
/**
* Collection for the checked items found
*/
private Hashtable items = new Hashtable();
/**
* Constructor
*/
public CollectCheckedAlg() {
super();
}
/**
* @see com.cc.framework.common.Algorithm#execute(String uniqueId, Object obj)
*/
public boolean execute(String uniqueId, Object obj) throws Exception {
if (obj instanceof Checkable) {
TreeNodeDataModel node = (TreeNodeDataModel) obj;
Checkable checkable = (Checkable) obj;
if (checkable.getCheckState() == CheckState.CHECKED.toInt()) {
items.put(node.getUniqueKey(), obj);
}
}
return true;
}
/**
* Returns the checked items
*/
public Hashtable getcheckedItems() {
return items;
}
}
// ----------------------------------
// methods
// ----------------------------------
/**
* Constructor for StocksBrowseAction.
*/
public ProductTreeBrowseAction() {
super();
BEANNAME = "products";
}
/**
* @see com.cc.framework.adapter.struts.FrameworkAction#doExecute(com.cc.framework.adapter.struts.ActionContext)
*/
public void doExecute(ActionContext ctx) throws Exception {
try {
refreshTree(ctx);
} catch (Throwable t) {
log.error("Error", t);
ctx.addError(Messages.ERROR_INIT_FORMBEAN, t);
}
// Dialog anzeigen
ctx.forwardToInput();
}
/**
* Initializ the Tree with the Display-Data
* @param ctx ActionContext
* @throws java.lang.Exception
*/
private void refreshTree(ActionContext ctx) throws Exception {
// In this Example we check if the Tree already
// exists, so we do not populte it again.
// So the Tree does not collaps if we reenter the Page
if (null != ctx.session().getAttribute(BEANNAME)) {
return;
}
// first we get the Data for our Tree
ProductGroupDsp data = DBProduct.fetch();
// secondly create the TreeControl and populate it
// with the Data to display
TreeControl products = new TreeControl();
products.setDataModel(data);
// third put the TreeControl into the Session-Object.
// Our Control is a statefull Object.
// Normaly you can use an Objectmanager or an other
// workflow Component that manage the Livecyle of the
// our TreeControl-Object.
ctx.session().setAttribute(BEANNAME, products);
}
// ------------------------------------------------
// Tree-Control Event Handler
// ------------------------------------------------
/**
* This Method is called when the TreeLabel is clicked
* In our Example we switch to the DetailView, which shows
* more Information about the node.
* @param ctx ControlActionContext
* @param key UniqueKey, as created in the Datamodel (e.g. the Primarykey)
*/
public void products_onDrilldown(ControlActionContext ctx, String key) throws Exception {
// highlight the node
((TreeControl) ctx.control()).select(key);
ctx.forwardByName(Forwards.DRILLDOWN, key);
}
/**
* This Method is call if a Node with an unknown number of
* Childs is clicked.
* @param ctx ControlActionContext
* @param key UniqueKey, as created in the Datamodel (e.g. the Primarykey)
*/
public void products_onExpandEx(ControlActionContext ctx, String key) throws Exception {
}
/**
* This Method is call if the save button is clicked
* @param ctx FormActionContext
*/
public void save_onClick(FormActionContext ctx) throws Exception {
Hashtable items = new Hashtable();
try {
TreeControl control = (TreeControl) ctx.session().getAttribute(BEANNAME);
CollectCheckedAlg collector = new CollectCheckedAlg();
TreeHelp.iterateNodes((TreeNodeDataModel)control.getDataModel(), collector);
items = collector.getcheckedItems();
// process items
} catch (Throwable t) {
log.error("Error", t);
ctx.addError(Messages.ERROR, t);
}
if (!ctx.hasErrors()) {
ctx.addGlobalMessage(Messages.MESSAGE, "Items checked: " + items.size());
}
// back to the jsp
ctx.forwardToInput();
}
} |
tree struts : java.lang.ClassCastException
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