org.geomajas.gwt2.client.map.feature.JsonFeatureFactory.java Source code

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Here is the source code for org.geomajas.gwt2.client.map.feature.JsonFeatureFactory.java

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/*
 * This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
 *
 * Copyright 2008-2014 Geosparc nv, http://www.geosparc.com/, Belgium.
 *
 * The program is available in open source according to the GNU Affero
 * General Public License. All contributions in this program are covered
 * by the Geomajas Contributors License Agreement. For full licensing
 * details, see LICENSE.txt in the project root.
 */
package org.geomajas.gwt2.client.map.feature;

import com.google.gwt.dom.client.Document;
import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONValue;

import org.geomajas.geometry.Geometry;
import org.geomajas.gwt2.client.map.attribute.Attribute;
import org.geomajas.gwt2.client.map.attribute.AttributeDescriptor;
import org.geomajas.gwt2.client.map.attribute.AttributeType;
import org.geomajas.gwt2.client.map.layer.FeaturesSupported;
import org.geomajas.gwt2.client.service.JsonService;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * Factory that creates features from JSON objects.
 * 
 * @author Jan De Moerloose
 *
 */
public class JsonFeatureFactory {

    /**
     * Create a feature collection for this layer.
     * 
     * @param jsonObject
     * @param layer the layer (optional)
     * @return the feature
     */
    public FeatureCollection createCollection(JSONObject jsonObject, FeaturesSupported layer) {
        FeatureCollection dto = new FeatureCollection(layer);
        String type = JsonService.getStringValue(jsonObject, "type");
        if ("FeatureCollection".equals(type)) {
            JSONArray features = JsonService.getChildArray(jsonObject, "features");
            for (int i = 0; i < features.size(); i++) {
                dto.getFeatures().add(createFeature((JSONObject) features.get(i), layer));
            }
        } else if ("Feature".equals(type)) {
            dto.getFeatures().add(createFeature(jsonObject, layer));
        }
        return dto;
    }

    private Feature createFeature(JSONObject jsonObject, FeaturesSupported layer) {
        String id = null;
        // id is not mandatory !
        if (jsonObject.containsKey("id")) {
            id = JsonService.getStringValue(jsonObject, "id");
        } else {
            id = Document.get().createUniqueId();
        }
        JSONObject properties = JsonService.getChild(jsonObject, "properties");
        Map<String, Attribute<?>> attributes = new HashMap<String, Attribute<?>>();
        if (layer != null && layer.getAttributeDescriptors().size() > 0) {
            for (AttributeDescriptor descr : layer.getAttributeDescriptors()) {
                AttributeType type = descr.getType();
                String name = descr.getName();
                Attribute attribute;
                if (Boolean.class.equals(type.getBinding())) {
                    attribute = new AttributeImpl(JsonService.getBooleanValue(properties, name));
                } else if (Short.class.equals(type.getBinding())) {
                    attribute = new AttributeImpl(JsonService.getShortValue(properties, name));
                } else if (Integer.class.equals(type.getBinding())) {
                    attribute = new AttributeImpl(JsonService.getIntValue(properties, name));
                } else if (Long.class.equals(type.getBinding())) {
                    attribute = new AttributeImpl(JsonService.getLongValue(properties, name));
                } else if (Double.class.equals(type.getBinding())) {
                    attribute = new AttributeImpl(JsonService.getDoubleValue(properties, name));
                } else if (Date.class.equals(type.getBinding())) {
                    attribute = new AttributeImpl(JsonService.getDateValue(properties, name));
                } else if (Geometry.class.equals(type.getBinding())) {
                    attribute = new AttributeImpl(JsonService.getGeometryValue(properties, name));
                } else {
                    attribute = new AttributeImpl(JsonService.getStringValue(properties, name));
                }
                attributes.put(name, attribute);
            }
        } else {
            for (String name : properties.keySet()) {
                JSONValue value = properties.get(name);
                Attribute attribute;
                if (value.isBoolean() != null) {
                    attribute = new AttributeImpl(JsonService.getBooleanValue(properties, name));
                } else if (value.isNumber() != null) {
                    attribute = new AttributeImpl(JsonService.getDoubleValue(properties, name));
                } else if (value.isObject() != null) {
                    attribute = new AttributeImpl(JsonService.getGeometryValue(properties, name));
                } else {
                    attribute = new AttributeImpl(JsonService.getStringValue(properties, name));
                }
                attributes.put(name, attribute);
            }
        }
        Geometry geometry = JsonService.getGeometryValue(jsonObject, "geometry");
        return new FeatureImpl(layer, id, attributes, geometry, id);
    }

}