org.mapfish.print.map.readers.VectorMapReader Maven / Gradle / Ivy

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/*
 * Copyright (C) 2013  Camptocamp
 *
 * This file is part of MapFish Print
 *
 * MapFish Print is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * MapFish Print 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with MapFish Print.  If not, see .
 */

package org.mapfish.print.map.readers;

import java.util.Collections;
import java.util.List;

import org.json.JSONException;
import org.mapfish.geo.MfGeo;
import org.mapfish.geo.MfGeoJSONReader;
import org.mapfish.print.InvalidJsonValueException;
import org.mapfish.print.RenderingContext;
import org.mapfish.print.Transformer;
import org.mapfish.print.map.MapTileTask;
import org.mapfish.print.map.ParallelMapTileLoader;
import org.mapfish.print.map.renderers.vector.FeaturesRenderer;
import org.mapfish.print.map.renderers.vector.StyledMfGeoFactory;
import org.mapfish.print.utils.PJsonObject;

import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfContentByte;

/**
 * Render vector layers. The geometries and the styling comes directly from the spec JSON.
 * It expects the following attributes from the JSON spec:
 * 
 * style: 'Vector'
 * 
geoJson: the geoJson to render
 * 
styleProperties: Name of the property within the features to use as style name (defaults
 * to '_style'). The given property may contain a style object directly.
 * 
styles: dictonary of styles. One style is defined as in OpenLayers.Feature.Vector.style
 * 
name: the layer name.
 * 
 */
public class VectorMapReader extends MapReader {
    public static class Factory implements MapReaderFactory {
        @Override
        public List create(String type, RenderingContext context,
                PJsonObject params) {
            return Collections.singletonList(new VectorMapReader(context, params));
        }
    }

    private final MfGeo geo;
    private final RenderingContext context;
    private final String name;

    public VectorMapReader(RenderingContext context, PJsonObject params) {
        super(params);
        this.context = context;

        final PJsonObject geoJson = params.getJSONObject("geoJson");
        final String styleProperty = params.optString("styleProperty", "_style");
        final PJsonObject styles = params.optJSONObject("styles");
        try {
            final MfGeoJSONReader reader = new MfGeoJSONReader(new StyledMfGeoFactory(styles, styleProperty));
            //noinspection deprecation
            geo = reader.decode(geoJson.getInternalObj());
        } catch (JSONException e) {
            throw new InvalidJsonValueException(params, "geoJson", geoJson.toString(), e);
        }
        name = params.optString("name", "vector");
    }

    public void render(final Transformer transformer, ParallelMapTileLoader parallelMapTileLoader, String srs, boolean first) {
        parallelMapTileLoader.addTileToLoad(new MapTileTask.RenderOnly() {
            public void renderOnPdf(PdfContentByte dc) throws DocumentException {
                FeaturesRenderer.render(context, dc, geo, transformer.getGeoTransform(false));
            }
        });
    }

    public boolean testMerge(MapReader other) {
        return false;
    }

    public String toString() {
        return name;
    }
}