io.warp10.script.functions.ISO8601.java Source code

Introduction

Here is the source code for io.warp10.script.functions.ISO8601.java

Source

//
//   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.continuum.store.Constants;
import io.warp10.script.NamedWarpScriptFunction;
import io.warp10.script.WarpScriptStackFunction;
import io.warp10.script.WarpScriptException;
import io.warp10.script.WarpScriptStack;

import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;

/**
 * Replaces the timestamp on the stack with a string representation of its instant.
 */
public class ISO8601 extends NamedWarpScriptFunction implements WarpScriptStackFunction {

    private final DateTimeFormatter dtf = ISODateTimeFormat.dateTime();

    public ISO8601(String name) {
        super(name);
    }

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

        Object obj = stack.peek();

        String tz = null;

        if (obj instanceof String) {
            tz = (String) obj;
            stack.pop();
        } else if (!(obj instanceof Long)) {
            throw new WarpScriptException(getName() + " operates on a timestamp or a timestamp + timezone.");
        }

        obj = stack.pop();

        if (!(obj instanceof Long)) {
            throw new WarpScriptException(getName() + " operates on a timestamp or a timestamp + timezone.");
        }

        long ts = (long) obj;

        DateTimeFormatter dtf;

        //
        // Set the timezone
        //

        if (null == tz) {
            dtf = this.dtf.withZoneUTC();
        } else {
            dtf = this.dtf.withZone(DateTimeZone.forID(tz));
        }

        long millis = ts / Constants.TIME_UNITS_PER_MS;

        String dt = dtf.print(millis);

        if (Constants.TIME_UNITS_PER_MS > 1) {
            //
            // Add sub millisecond string
            //

            StringBuilder sb = new StringBuilder();

            sb.append(dt, 0, 23);

            long subms = Constants.TIME_UNITS_PER_MS;

            subms += ts % Constants.TIME_UNITS_PER_MS;

            String str = Long.toString(subms);

            sb.append(str, 1, str.length());

            sb.append(dt, 23, dt.length());

            stack.push(sb.toString());
        } else {
            stack.push(dt);
        }

        return stack;
    }
}