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

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Here is the source code for io.warp10.script.functions.HHCODETO.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 java.math.BigInteger;

import com.geoxp.GeoXPLib;
import com.google.common.primitives.Longs;

/**
 * Convert a GeoHash to lat/lon
 */
public class HHCODETO extends NamedWarpScriptFunction implements WarpScriptStackFunction {

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

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

        Object hhcode = stack.pop();

        double[] latlon = null;

        if (hhcode instanceof Long) {
            latlon = GeoXPLib.fromGeoXPPoint((long) hhcode);
        } else if (hhcode instanceof String) {
            long hh = new BigInteger(hhcode.toString(), 16).longValue();
            latlon = GeoXPLib.fromGeoXPPoint(hh);
        } else if (hhcode instanceof byte[]) {
            long hh = Longs.fromByteArray((byte[]) hhcode);
            latlon = GeoXPLib.fromGeoXPPoint(hh);
        } else {
            throw new WarpScriptException(getName() + " expects a long, a string or a byte array.");
        }

        stack.push(latlon[0]);
        stack.push(latlon[1]);

        return stack;
    }
}