org.n52.client.ctrl.PropertiesManager.java Source code

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Here is the source code for org.n52.client.ctrl.PropertiesManager.java

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/**
 * Copyright (C) 2012-2014 52North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 2 as publishedby the Free
 * Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of the
 * following licenses, the combination of the program with the linked library is
 * not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed under
 * the aforementioned licenses, is permitted by the copyright holders if the
 * distribution is compliant with both the GNU General Public License version 2
 * and the aforementioned licenses.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU General Public License for more details.
 */
package org.n52.client.ctrl;

import static org.n52.client.sos.i18n.SosStringsAccessor.i18n;

import java.util.ArrayList;

import org.n52.client.Application;
import org.n52.client.ui.Toaster;

import com.google.gwt.core.client.GWT;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.i18n.client.LocaleInfo;
import com.google.gwt.xml.client.Document;
import com.google.gwt.xml.client.NodeList;
import com.google.gwt.xml.client.XMLParser;

public class PropertiesManager {

    private static PropertiesManager instance;

    public static String language = "en";

    protected Document properties;

    private boolean initiated = false;

    public static PropertiesManager getPropertiesManager() {
        if (instance == null) {
            instance = new PropertiesManager();
            if (!instance.isInitiated()) {
                instance.init();
                instance.setInitiated(true);
            }
        }
        return instance;
    }

    private void init() {
        try {
            // TODO refactor grabbing properties + loading mechanism
            setCurrentLanguage();
            RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.GET,
                    "properties/client-properties.xml");
            RequestCallback callback = new RequestCallback() {

                public void onError(Request request, Throwable exception) {
                    Toaster.getToasterInstance().addMessage(i18n.errorRequest());
                }

                public void onResponseReceived(Request request, Response response) {
                    PropertiesManager.this.properties = XMLParser.parse(response.getText());
                    Application.continueStartup();
                }
            };
            requestBuilder.sendRequest(null, callback);
        } catch (RequestException ex) {
            Toaster.getToasterInstance().addMessage(i18n.errorRequest());
        }
    }

    private void setCurrentLanguage() {
        LocaleInfo currentLocale = LocaleInfo.getCurrentLocale();
        String localeName = currentLocale.getLocaleName();
        PropertiesManager.language = localeName.substring(0, 2);
    }

    public String getParameterAsString(String name) {
        ArrayList<String> attributes = getParameters(name);
        return attributes.isEmpty() ? null : attributes.get(0);
    }

    /**
     * @param name the parameter name
     * @return the parameter's boolean value. Note: if attribute is not available <code>false</code> is returned!
     */
    public boolean getParameterAsBoolean(String name) {
        return Boolean.parseBoolean(getParameterAsString(name));
    }

    public int getParamaterAsInt(String name, int defaultValue) {
        try {
            return Integer.parseInt(getParameters(name).get(0));
        } catch (Exception e) {
            GWT.log("Error while parsing value for key " + name, e);
            return defaultValue;
        }
    }

    public ArrayList<String> getParameters(String name) {
        ArrayList<String> array = new ArrayList<String>();
        if (hasProperty(name)) {
            NodeList nodes = this.properties.getElementsByTagName(name);
            for (int i = 0; i < nodes.getLength(); i++) {
                array.add(nodes.item(i).getFirstChild().toString());
            }
        }
        return array;
    }

    private boolean hasProperty(String name) {
        return properties != null && properties.getElementsByTagName(name) != null;
    }

    public boolean isSetProperty(String name) {
        return hasProperty(name) && properties.getElementsByTagName(name).getLength() > 0;
    }

    public ArrayList<String> getTabsFromPropertiesFile() {
        return instance.getParameters("tab");
    }

    private boolean isInitiated() {
        return this.initiated;
    }

    private void setInitiated(boolean initiated) {
        this.initiated = initiated;
    }

}