org.richfaces.examples.richrates.ChartBean.java Source code

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Here is the source code for org.richfaces.examples.richrates.ChartBean.java

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 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
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 *
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 * Lesser General Public License for more details.
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package org.richfaces.examples.richrates;

import java.io.Serializable;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.annotation.PostConstruct;
import javax.enterprise.context.SessionScoped;
import javax.inject.Inject;
import javax.inject.Named;
import javax.validation.constraints.AssertTrue;
import javax.validation.constraints.Past;

import org.joda.time.DateTime;
import org.richfaces.event.DropEvent;
import org.richfaces.examples.richrates.annotation.ExchangeRates;
import org.richfaces.examples.richrates.annotation.IssueDate;

/**
 * Bean used on the page with chart. Is is possible to draw a chart for one currency for selected time range.
 * 
 * @author <a href="mailto:ppitonak@redhat.com">Pavol Pitonak</a>
 * @since 4.1
 */
@Named
@SessionScoped
public class ChartBean implements Serializable {

    private static final long serialVersionUID = -1L;
    @Inject
    @IssueDate
    @Past(message = "To date: Future date cannot be selected.")
    private Date toDate;
    @Past(message = "From date: Future date cannot be selected.")
    private Date fromDate;
    @Inject
    @ExchangeRates
    private Map<Date, Map<String, Double>> currencies;

    private Currency currency;

    private String selectedCurrency;
    private Logger logger;

    /**
     * Initializes class' fields.
     */
    @PostConstruct
    private void initialize() {
        logger = Logger.getLogger(ChartBean.class.toString());
        selectedCurrency = "USD";
        fromDate = new DateTime(toDate).minusDays(30).toDate();
        parseCurrencyData();
    }

    /**
     * Getter for start date.
     * 
     * @return start date for chart
     */
    public Date getFromDate() {
        return fromDate;
    }

    /**
     * Setter for start date.
     * 
     * @param fromDate
     *            start date for chart
     */
    public void setFromDate(Date fromDate) {
        this.fromDate = fromDate;
    }

    /**
     * Getter for end date.
     * 
     * @return end date for chart
     */
    public Date getToDate() {
        return toDate;
    }

    /**
     * Setter for end date.
     * 
     * @param toDate
     *            end date for chart
     */
    public void setToDate(Date toDate) {
        this.toDate = toDate;
    }

    /**
     * Getter for selected currency.
     * 
     * @return ISO code of the selected currency
     */
    public String getSelectedCurrency() {
        return selectedCurrency;
    }

    /**
     * Creates a data structure needed by chart component. It creates a set of points where X is date and Y is an
     * exchange rate.
     * 
     * @return set of points for chart
     */
    public void parseCurrencyData() {
        DateTime toDate = new DateTime(this.toDate);
        DateTime actualDate = new DateTime(fromDate);
        currency = new Currency();
        currency.setName(getSelectedCurrency());
        List<CurrencyRecord> records = new LinkedList<CurrencyRecord>();
        while (actualDate.compareTo(toDate) <= 0) {
            if (currencies.get(actualDate.toDate()) == null) {
                actualDate = actualDate.plusDays(1);
                continue;
            }
            String dayAndMonth = actualDate.toString("dd.MM");
            Number rate = currencies.get(actualDate.toDate()).get(selectedCurrency).doubleValue();
            records.add(new CurrencyRecord(dayAndMonth, rate));
            actualDate = actualDate.plusDays(1);
        }
        currency.setData(records);
    }

    @AssertTrue(message = "Dates are in wrong order.")
    public boolean isDatesCorrect() {
        logger.log(Level.FINE, "Validating the order of dates");
        return new DateTime(fromDate).isBefore(toDate.getTime());
    }

    /**
     * A method used to process drop event.
     * 
     * @param event
     *            a drop event on the chart
     */
    public void processDrop(DropEvent event) {
        selectedCurrency = (String) event.getDragValue();
        parseCurrencyData();
    }

    public Currency getCurrency() {
        return currency;
    }

    public void setCurrency(Currency currency) {
        this.currency = currency;
    }
}