/*
* Ext GWT 2.2.4 - Ext for GWT
* Copyright(c) 2007-2010, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
package com.extjs.gxt.charts.client.model;
import com.extjs.gxt.charts.client.Chart;
import com.extjs.gxt.charts.client.ChartManager;
import com.extjs.gxt.charts.client.model.charts.ChartConfig;
import com.extjs.gxt.ui.client.data.ModelData;
import com.extjs.gxt.ui.client.data.ModelStringProvider;
import com.extjs.gxt.ui.client.store.ListStore;
import com.extjs.gxt.ui.client.store.StoreEvent;
import com.extjs.gxt.ui.client.store.StoreListener;
/**
* Base class for objects that provide chart data form models in a store.
*/
public abstract class DataProvider {
protected String labelProperty, textProperty, valueProperty;
protected ModelStringProvider<ModelData> labelProvider, textProvider;
protected ListStore<ModelData> store;
protected double maxYValue, minYValue;
private String chartId;
private StoreListener<ModelData> storeListener;
/**
* Creates a new data provider.
*/
public DataProvider() {
storeListener = new StoreListener<ModelData>() {
@Override
public void handleEvent(StoreEvent<ModelData> e) {
onStoreChange(e);
}
};
}
/**
* Returns the label property.
*
* @return the label property
*/
public String getLabelProperty() {
return labelProperty;
}
/**
* Returns the model label provider.
*
* @return the label provider
*/
public ModelStringProvider<ModelData> getLabelProvider() {
return labelProvider;
}
/**
* Returns the text property.
*
* @return the text property
*/
public String getTextProperty() {
return textProperty;
}
/**
* Returns the model text provider.
*
* @return the model text provider
*/
public ModelStringProvider<ModelData> getTextProvider() {
return textProvider;
}
/**
* Returns the value property.
*
* @return the value property
*/
public String getValueProperty() {
return valueProperty;
}
/**
* Binds the data provider the the given store.
*
* @param store the store
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public void bind(ListStore store) {
if (this.store != null) {
this.store.removeStoreListener(storeListener);
}
this.store = store;
this.store.addStoreListener(storeListener);
}
public abstract void populateData(ChartConfig config);
/**
* Sets the label property. Works when models contains a property with the
* label value, an alternative is to use a label provider (
* {@link #setLabelProvider(ModelStringProvider)}.
*
* @param labelProperty the label property
*/
public void setLabelProperty(String labelProperty) {
this.labelProperty = labelProperty;
}
/**
* Sets the label provider.
*
* @param labelProvider the label provider
*/
public void setLabelProvider(ModelStringProvider<ModelData> labelProvider) {
this.labelProvider = labelProvider;
}
/**
* Sets the text property.
**/
public void setTextProperty(String textProperty) {
this.textProperty = textProperty;
}
/**
* Sets the test provider.
*
* @param textProvider the text provider
*/
public void setTextProvider(ModelStringProvider<ModelData> textProvider) {
this.textProvider = textProvider;
}
/**
* Sets the value property.
**/
public void setValueProperty(String valueProperty) {
this.valueProperty = valueProperty;
}
protected String getLabel(ModelData model) {
String label = null;
if (labelProvider != null) {
label = labelProvider.getStringValue(model, labelProperty);
} else if (labelProperty != null) {
Object o = model.<Object> get(labelProperty);
label = o != null ? o.toString() : null;
}
return label == null ? "" : label;
}
protected double getMaxYValue() {
return maxYValue;
}
protected double getMinYValue() {
return minYValue;
}
protected String getText(ModelData model) {
String text = null;
if (textProvider != null) {
text = textProvider.getStringValue(model, textProperty);
} else if (textProperty != null) {
Object o = model.<Object> get(textProperty);
text = o != null ? o.toString() : null;
}
return text == null ? "" : text;
}
protected Number getValue(ModelData model) {
Number value = null;
if (valueProperty != null) {
Object o = model.<Object> get(valueProperty);
if (o != null) {
if (o instanceof String) {
value = Double.parseDouble((String) o);
} else if (o instanceof Number) {
value = (Number) o;
}
}
}
return value;
}
protected void onStoreChange(StoreEvent<ModelData> se) {
Chart chart = ChartManager.get().getChart(chartId);
if (chart != null) {
chart.delayedRefresh(50);
}
}
}