io.mapzone.arena.share.content.ImagePngContentProvider.java Source code

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Here is the source code for io.mapzone.arena.share.content.ImagePngContentProvider.java

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/*
 * polymap.org 
 * Copyright (C) 2016-2018, the @authors. All rights reserved.
 *
 * This is free software; you can redistribute it and/or modify it under the terms of
 * the GNU Lesser General Public License as published by the Free Software
 * Foundation; either version 3.0 of the License, or (at your option) any later
 * version.
 *
 * This software 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 Lesser General Public License for more details.
 */
package io.mapzone.arena.share.content;

import java.util.ArrayList;
import java.util.List;
import java.util.StringJoiner;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.NameValuePair;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.message.BasicNameValuePair;

import com.google.common.base.Joiner;
import com.vividsolutions.jts.geom.Envelope;

import org.polymap.service.geoserver.GeoServerUtils;

import io.mapzone.arena.ArenaPlugin;
import io.mapzone.arena.GeoServerStarter;
import io.mapzone.arena.share.ui.ShareContext;
import io.mapzone.arena.share.ui.ShareContext.SelectionDescriptor;

/**
 * Creates a complete openlayers HTML page as string.
 *
 * @author Steffen Stundzig
 * @author Falko Brutigam
 */
public class ImagePngContentProvider implements ShareableContentProvider {

    public final static String MIMETYPE = "image/png";

    public class ImagePngContent implements ShareableContent {

        public String imgResource;

        public String previewResource;

        public int imgWidth;

        public int imgHeight;

        public int previewWidth;

        public int previewHeight;
    }

    // instance *******************************************

    private ShareContext context;

    @Override
    public ImagePngContent get() {
        ImagePngContent content = new ImagePngContent();

        StringJoiner layers = new StringJoiner(",");
        for (SelectionDescriptor selection : context.selectionDescriptors.get()) {
            layers.add(GeoServerUtils.simpleName(selection.layer.get().label.get()));
            // FIXME, if multilayers are working, remove this break!!!
            //break;
        }
        Envelope bbox = context.boundingBox.get();
        String extent = Joiner.on(",").join((int) bbox.getMinX(), (int) bbox.getMinY(), (int) bbox.getMaxX(),
                (int) bbox.getMaxY());

        String imageUrl = ArenaPlugin.instance().config().getProxyUrl() + GeoServerStarter.ALIAS;
        List<NameValuePair> params = new ArrayList() {
            {
                add(nameValue("SERVICE", "WMS"));
                add(nameValue("VERSION", "1.3.0"));
                add(nameValue("REQUEST", "GetMap"));
                add(nameValue("FORMAT", "image/png"));
                add(nameValue("CRS", "EPSG:3857"));
                add(nameValue("BBOX", extent.toString()));
                add(nameValue("LAYERS", layers.toString()));
            }
        };
        if (!StringUtils.isBlank(ArenaPlugin.instance().config().getServiceAuthToken())) {
            params.add(nameValue("authToken", ArenaPlugin.instance().config().getServiceAuthToken()));
        }
        content.imgWidth = context.displaySize.get().x;
        content.imgHeight = context.displaySize.get().y;

        content.previewWidth = 320;
        content.previewHeight = content.previewWidth * content.imgHeight / content.imgWidth;

        ArrayList previewParams = new ArrayList(params) {
            {
                add(nameValue("WIDTH", content.previewWidth));
                add(nameValue("HEIGHT", content.previewHeight));
            }
        };
        content.previewResource = imageUrl + "?" + URLEncodedUtils.format(previewParams, "UTF-8");

        ArrayList imgParams = new ArrayList(params) {
            {
                add(nameValue("WIDTH", content.imgWidth));
                add(nameValue("HEIGHT", content.imgHeight));
            }
        };
        content.imgResource = imageUrl + "?" + URLEncodedUtils.format(imgParams, "UTF-8");
        return content;
    }

    protected NameValuePair nameValue(String name, Object value) {
        return new BasicNameValuePair(name, value.toString());
    }

    @Override
    public boolean supports(final String mimeType, @SuppressWarnings("hiding") final ShareContext context) {
        this.context = context;
        return MIMETYPE.equals(mimeType) && !context.selectionDescriptors.get().isEmpty();
    }
}