Java tutorial
package org.drools.brms.client.modeldriven.ui; /* * Copyright 2005 JBoss 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. */ import java.util.Iterator; import java.util.List; import org.drools.brms.client.common.DirtyableComposite; import org.drools.brms.client.common.DirtyableFlexTable; import org.drools.brms.client.common.DirtyableHorizontalPane; import org.drools.brms.client.common.DirtyableVerticalPane; import org.drools.brms.client.common.ErrorPopup; import org.drools.brms.client.common.FormStylePopup; import org.drools.brms.client.common.ImageButton; import org.drools.brms.client.common.YesNoDialog; import org.drools.brms.client.modeldriven.HumanReadable; import org.drools.brms.client.modeldriven.SuggestionCompletionEngine; import org.drools.brms.client.modeldriven.brl.ActionInsertFact; import org.drools.brms.client.modeldriven.brl.ActionInsertLogicalFact; import org.drools.brms.client.modeldriven.brl.ActionRetractFact; import org.drools.brms.client.modeldriven.brl.ActionSetField; import org.drools.brms.client.modeldriven.brl.ActionUpdateField; import org.drools.brms.client.modeldriven.brl.CompositeFactPattern; import org.drools.brms.client.modeldriven.brl.DSLSentence; import org.drools.brms.client.modeldriven.brl.FactPattern; import org.drools.brms.client.modeldriven.brl.IAction; import org.drools.brms.client.modeldriven.brl.IPattern; import org.drools.brms.client.modeldriven.brl.RuleAttribute; import org.drools.brms.client.modeldriven.brl.RuleModel; import org.drools.brms.client.packages.SuggestionCompletionCache; import org.drools.brms.client.rpc.RuleAsset; import com.google.gwt.user.client.Command; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.ChangeListener; import com.google.gwt.user.client.ui.ClickListener; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Image; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.ListBox; import com.google.gwt.user.client.ui.Widget; /** * This is the parent widget that contains the model based rule builder. * * @author Michael Neale * */ public class RuleModeller extends DirtyableComposite { private DirtyableFlexTable layout; private SuggestionCompletionEngine completions; private RuleModel model; public RuleModeller(RuleAsset asset) { this.model = (RuleModel) asset.content; this.completions = SuggestionCompletionCache.getInstance().getEngineFromCache(asset.metaData.packageName); layout = new DirtyableFlexTable(); initWidget(); layout.setStyleName("model-builder-Background"); initWidget(layout); setWidth("100%"); setHeight("100%"); } /** * This updates the widget to reflect the state of the model. */ public void initWidget() { layout.clear(); Image addPattern = new ImageButton("images/new_item.gif"); addPattern.setTitle("Add a condition to this rule."); addPattern.addClickListener(new ClickListener() { public void onClick(Widget w) { showConditionSelector(w); } }); layout.setWidget(0, 0, new Label("WHEN")); layout.setWidget(0, 2, addPattern); layout.setWidget(1, 1, renderLhs(this.model)); layout.setWidget(2, 0, new Label("THEN")); Image addAction = new ImageButton("images/new_item.gif"); addAction.setTitle("Add an action to this rule."); addAction.addClickListener(new ClickListener() { public void onClick(Widget w) { showActionSelector(w); } }); layout.setWidget(2, 2, addAction); layout.setWidget(3, 1, renderRhs(this.model)); layout.setWidget(4, 0, new Label("(options)")); layout.setWidget(4, 2, getAddAttribute()); layout.setWidget(5, 1, new RuleAttributeWidget(this, this.model)); } public void refreshWidget() { initWidget(); makeDirty(); } private Widget getAddAttribute() { Image add = new ImageButton("images/new_item.gif"); add.setTitle("Add an option to the rule, to modify its behavior when evaluated or executed."); add.addClickListener(new ClickListener() { public void onClick(Widget w) { showAttributeSelector(w); } }); return add; } protected void showAttributeSelector(Widget w) { final FormStylePopup pop = new FormStylePopup("images/config.png", "Add an option to the rule"); final ListBox list = RuleAttributeWidget.getAttributeList(); list.setSelectedIndex(0); list.addChangeListener(new ChangeListener() { public void onChange(Widget w) { model.addAttribute(new RuleAttribute(list.getItemText(list.getSelectedIndex()), "")); refreshWidget(); pop.hide(); } }); pop.setStyleName("ks-popups-Popup"); pop.addAttribute("Attribute", list); pop.setPopupPosition(w.getAbsoluteLeft() - 400, w.getAbsoluteTop()); pop.show(); } /** * Do all the widgets for the RHS. */ /* * TODO STILL NEED TO BE CHECKED */ private Widget renderRhs(final RuleModel model) { DirtyableVerticalPane vert = new DirtyableVerticalPane(); for (int i = 0; i < model.rhs.length; i++) { IAction action = model.rhs[i]; Widget w = null; if (action instanceof ActionSetField) { w = new ActionSetFieldWidget(this, (ActionSetField) action, completions); } else if (action instanceof ActionInsertFact) { w = new ActionInsertFactWidget(this, (ActionInsertFact) action, completions); } else if (action instanceof ActionRetractFact) { w = new ActionRetractFactWidget(this.completions, (ActionRetractFact) action); } else if (action instanceof DSLSentence) { w = new DSLSentenceWidget((DSLSentence) action); w.setStyleName("model-builderInner-Background"); } //w.setWidth( "100%" ); vert.add(spacerWidget()); //vert.setWidth( "100%" ); DirtyableHorizontalPane horiz = new DirtyableHorizontalPane(); Image remove = new ImageButton("images/delete_item_small.gif"); remove.setTitle("Remove this action."); final int idx = i; remove.addClickListener(new ClickListener() { public void onClick(Widget w) { YesNoDialog diag = new YesNoDialog("Remove this item?", new Command() { public void execute() { model.removeRhsItem(idx); refreshWidget(); } }); diag.setPopupPosition(w.getAbsoluteLeft(), w.getAbsoluteTop()); diag.show(); } }); horiz.add(w); if (!(w instanceof ActionRetractFactWidget)) { w.setWidth("100%"); horiz.setWidth("100%"); } horiz.add(remove); vert.add(horiz); } return vert; } /** * Pops up the fact selector. */ protected void showConditionSelector(final Widget w) { final FormStylePopup popup = new FormStylePopup("images/new_fact.gif", "Add a condition to the rule..."); // // The list of facts // String[] facts = completions.getFactTypes(); final ListBox factTypeBox = new ListBox(); factTypeBox.addItem("Choose fact type...", "IGNORE"); for (int i = 0; i < facts.length; i++) { factTypeBox.addItem(facts[i]); } factTypeBox.setSelectedIndex(0); if (facts.length > 0) popup.addAttribute("Fact", factTypeBox); factTypeBox.addChangeListener(new ChangeListener() { public void onChange(Widget w) { String s = factTypeBox.getItemText(factTypeBox.getSelectedIndex()); if (!s.equals("IGNORE")) { addNewFact(s); popup.hide(); } } }); popup.setStyleName("ks-popups-Popup"); // // The list of top level CEs // String ces[] = HumanReadable.CONDITIONAL_ELEMENTS; final ListBox ceBox = new ListBox(); ceBox.addItem("Choose condition type...", "IGNORE"); for (int i = 0; i < ces.length; i++) { String ce = ces[i]; ceBox.addItem(HumanReadable.getCEDisplayName(ce), ce); } ceBox.setSelectedIndex(0); if (facts.length > 0) popup.addAttribute("Condition type", ceBox); ceBox.addChangeListener(new ChangeListener() { public void onChange(Widget w) { String s = ceBox.getValue(ceBox.getSelectedIndex()); if (!s.equals("IGNORE")) { addNewCE(s); popup.hide(); } } }); // // The list of DSL sentences // if (completions.getDSLConditions().length > 0) { final ListBox dsls = new ListBox(); dsls.addItem("Choose..."); for (int i = 0; i < completions.getDSLConditions().length; i++) { DSLSentence sen = completions.getDSLConditions()[i]; dsls.addItem(sen.toString(), Integer.toString(i)); } dsls.addChangeListener(new ChangeListener() { public void onChange(Widget w) { int idx = Integer.parseInt(dsls.getValue(dsls.getSelectedIndex())); addNewDSLLhs((DSLSentence) completions.getDSLConditions()[idx]); popup.hide(); } }); popup.addAttribute("DSL sentence", dsls); } popup.setPopupPosition(w.getAbsoluteLeft() - 400, w.getAbsoluteTop()); popup.show(); } protected void addNewDSLLhs(DSLSentence sentence) { model.addLhsItem(sentence.copy()); refreshWidget(); } protected void showActionSelector(Widget w) { final FormStylePopup popup = new FormStylePopup("images/new_fact.gif", "Add a new action..."); popup.setStyleName("ks-popups-Popup"); // // First load up the stuff to do with bound variables or globals // List vars = model.getBoundFacts(); final ListBox varBox = new ListBox(); final ListBox retractBox = new ListBox(); final ListBox modifyBox = new ListBox(); varBox.addItem("Choose ..."); retractBox.addItem("Choose ..."); modifyBox.addItem("Choose ..."); for (Iterator iter = vars.iterator(); iter.hasNext();) { String v = (String) iter.next(); varBox.addItem(v); retractBox.addItem(v); modifyBox.addItem(v); } String[] globals = this.completions.getGlobalVariables(); for (int i = 0; i < globals.length; i++) { varBox.addItem(globals[i]); } varBox.setSelectedIndex(0); varBox.addChangeListener(new ChangeListener() { public void onChange(Widget w) { addActionSetField(varBox.getItemText(varBox.getSelectedIndex())); popup.hide(); } }); retractBox.addChangeListener(new ChangeListener() { public void onChange(Widget w) { addRetract(retractBox.getItemText(retractBox.getSelectedIndex())); popup.hide(); } }); modifyBox.addChangeListener(new ChangeListener() { public void onChange(Widget w) { addModify(modifyBox.getItemText(modifyBox.getSelectedIndex())); popup.hide(); } }); if (varBox.getItemCount() > 1) { popup.addAttribute("Set the values of a field on", varBox); } if (modifyBox.getItemCount() > 1) { HorizontalPanel horiz = new HorizontalPanel(); horiz.add(modifyBox); Image img = new Image("images/information.gif"); img.setTitle("Modify a field on a fact, and notify the engine to re-evaluate rules."); horiz.add(img); popup.addAttribute("Modify a fact", horiz); } //popup.addRow( new HTML("<hr/>") ); if (retractBox.getItemCount() > 1) { popup.addAttribute("Retract the fact", retractBox); } //popup.addRow( new HTML("<hr/>") ); final ListBox factsToAssert = new ListBox(); final ListBox factsToLogicallyAssert = new ListBox(); factsToAssert.addItem("Choose ..."); factsToLogicallyAssert.addItem("Choose ..."); for (int i = 0; i < completions.getFactTypes().length; i++) { String item = completions.getFactTypes()[i]; factsToAssert.addItem(item); factsToLogicallyAssert.addItem(item); } factsToAssert.addChangeListener(new ChangeListener() { public void onChange(Widget w) { String fact = factsToAssert.getItemText(factsToAssert.getSelectedIndex()); model.addRhsItem(new ActionInsertFact(fact)); refreshWidget(); popup.hide(); } }); factsToLogicallyAssert.addChangeListener(new ChangeListener() { public void onChange(Widget w) { String fact = factsToLogicallyAssert.getItemText(factsToLogicallyAssert.getSelectedIndex()); model.addRhsItem(new ActionInsertLogicalFact(fact)); refreshWidget(); popup.hide(); } }); if (factsToAssert.getItemCount() > 1) { popup.addAttribute("Insert a new fact", factsToAssert); HorizontalPanel horiz = new HorizontalPanel(); horiz.add(factsToLogicallyAssert); Image img = new Image("images/information.gif"); img.setTitle( "Logically assert a fact - the fact will be retracted when the supporting evidence is removed."); horiz.add(img); popup.addAttribute("Logically insert a new fact", horiz); } // // The list of DSL sentences // if (completions.getDSLActions().length > 0) { final ListBox dsls = new ListBox(); dsls.addItem("Choose..."); for (int i = 0; i < completions.getDSLActions().length; i++) { DSLSentence sen = (DSLSentence) completions.getDSLActions()[i]; dsls.addItem(sen.toString(), Integer.toString(i)); } dsls.addChangeListener(new ChangeListener() { public void onChange(Widget w) { int idx = Integer.parseInt(dsls.getValue(dsls.getSelectedIndex())); addNewDSLRhs((DSLSentence) completions.getDSLActions()[idx]); popup.hide(); } }); popup.addAttribute("DSL sentence", dsls); } popup.setPopupPosition(Window.getClientWidth() / 3, Window.getClientHeight() / 3); popup.show(); } protected void addModify(String itemText) { this.model.addRhsItem(new ActionUpdateField(itemText)); refreshWidget(); } protected void addNewDSLRhs(DSLSentence sentence) { this.model.addRhsItem(sentence.copy()); refreshWidget(); } protected void addRetract(String var) { this.model.addRhsItem(new ActionRetractFact(var)); refreshWidget(); } protected void addActionSetField(String itemText) { this.model.addRhsItem(new ActionSetField(itemText)); refreshWidget(); } protected void addNewCE(String s) { this.model.addLhsItem(new CompositeFactPattern(s)); refreshWidget(); } /** * Adds a fact to the model, and then refreshes the display. */ protected void addNewFact(String itemText) { this.model.addLhsItem(new FactPattern(itemText)); refreshWidget(); } /** * Builds all the condition widgets. */ private Widget renderLhs(final RuleModel model) { DirtyableVerticalPane vert = new DirtyableVerticalPane(); for (int i = 0; i < model.lhs.length; i++) { IPattern pattern = model.lhs[i]; Widget w = null; if (pattern instanceof FactPattern) { w = new FactPatternWidget(this, pattern, completions, true); vert.add(wrapLHSWidget(model, i, w)); vert.add(spacerWidget()); } else if (pattern instanceof CompositeFactPattern) { w = new CompositeFactPatternWidget(this, (CompositeFactPattern) pattern, completions); vert.add(wrapLHSWidget(model, i, w)); vert.add(spacerWidget()); } else if (pattern instanceof DSLSentence) { //ignore this time } else { throw new RuntimeException("I don't know what type of pattern that is."); } } DirtyableVerticalPane dsls = new DirtyableVerticalPane(); for (int i = 0; i < model.lhs.length; i++) { IPattern pattern = model.lhs[i]; Widget w = null; if (pattern instanceof DSLSentence) { w = new DSLSentenceWidget((DSLSentence) pattern); dsls.add(wrapLHSWidget(model, i, w)); dsls.setStyleName("model-builderInner-Background"); } } vert.add(dsls); return vert; } private HTML spacerWidget() { HTML h = new HTML(" "); h.setHeight("2px"); return h; } /** * This adds the widget to the UI, also adding the remove icon. */ private Widget wrapLHSWidget(final RuleModel model, int i, Widget w) { DirtyableHorizontalPane horiz = new DirtyableHorizontalPane(); Image remove = new ImageButton("images/delete_item_small.gif"); remove.setTitle("Remove this ENTIRE condition, and all the field constraints that belong to it."); final int idx = i; remove.addClickListener(new ClickListener() { public void onClick(Widget w) { YesNoDialog diag = new YesNoDialog("Remove this entire condition?", new Command() { public void execute() { if (model.removeLhsItem(idx)) { refreshWidget(); } else { ErrorPopup.showMessage( "Can't remove that item as it is used in the action part of the rule."); } } }); diag.setPopupPosition(w.getAbsoluteLeft(), w.getAbsoluteTop()); diag.show(); } }); horiz.setWidth("100%"); w.setWidth("100%"); horiz.add(w); horiz.add(remove); return horiz; } public RuleModel getModel() { return model; } /** * Returns true is a var name has already been used * either by the rule, or as a global. */ public boolean isVariableNameUsed(String name) { return model.isVariableNameUsed(name) || completions.isGlobalVariable(name); } public boolean isDirty() { return (layout.hasDirty() || dirtyflag); } public SuggestionCompletionEngine getSuggestionCompletions() { return this.completions; } }