io.warp10.script.functions.TOHHCODE.java Source code

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Here is the source code for io.warp10.script.functions.TOHHCODE.java

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//
//   Copyright 2016  Cityzen Data
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.
//

package io.warp10.script.functions;

import io.warp10.script.NamedWarpScriptFunction;
import io.warp10.script.WarpScriptException;
import io.warp10.script.WarpScriptStack;
import io.warp10.script.WarpScriptStackFunction;

import com.geoxp.GeoXPLib;
import com.geoxp.oss.jarjar.org.apache.commons.codec.binary.Hex;
import com.google.common.primitives.Longs;

/**
 * Convert a lat/lon pair to an HHCode
 */
public class TOHHCODE extends NamedWarpScriptFunction implements WarpScriptStackFunction {

    public TOHHCODE(String name) {
        super(name);
    }

    @Override
    public Object apply(WarpScriptStack stack) throws WarpScriptException {

        Object lon = stack.pop();
        Object lat = stack.pop();

        if (!(lon instanceof Number) && !(lat instanceof Number)) {
            throw new WarpScriptException(getName() + " expects a latitude and a longitude on the stack.");
        }

        long geoxppoint = GeoXPLib.toGeoXPPoint(((Number) lat).doubleValue(), ((Number) lon).doubleValue());
        String hhcode = Hex.encodeHexString(Longs.toByteArray(geoxppoint));

        stack.push(hhcode);

        return stack;
    }
}