com.metamx.common.parsers.TimestampParser.java Source code

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Here is the source code for com.metamx.common.parsers.TimestampParser.java

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/*
 * Copyright 2011 - 2015 Metamarkets Group Inc.
 *
 * 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 com.metamx.common.parsers;

import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.metamx.common.IAE;
import com.metamx.common.logger.Logger;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

public class TimestampParser {
    private static final Logger log = new Logger(TimestampParser.class);

    public static Function<String, DateTime> createTimestampParser(final String format) {
        if (format.equalsIgnoreCase("auto")) {
            // Could be iso or millis
            return new Function<String, DateTime>() {
                @Override
                public DateTime apply(String input) {
                    Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");

                    for (int i = 0; i < input.length(); i++) {
                        if (input.charAt(i) < '0' || input.charAt(i) > '9') {
                            return new DateTime(ParserUtils.stripQuotes(input));
                        }
                    }

                    return new DateTime(Long.parseLong(input));
                }
            };
        } else if (format.equalsIgnoreCase("iso")) {
            return new Function<String, DateTime>() {
                @Override
                public DateTime apply(String input) {
                    Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                    return new DateTime(ParserUtils.stripQuotes(input));
                }
            };
        } else if (format.equalsIgnoreCase("posix") || format.equalsIgnoreCase("millis")
                || format.equalsIgnoreCase("nano")) {
            final Function<Number, DateTime> numericFun = createNumericTimestampParser(format);
            return new Function<String, DateTime>() {
                @Override
                public DateTime apply(String input) {
                    Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                    return numericFun.apply(Long.parseLong(ParserUtils.stripQuotes(input)));
                }
            };
        } else if (format.equalsIgnoreCase("ruby")) {
            // Numeric parser ignores millis for ruby.
            final Function<Number, DateTime> numericFun = createNumericTimestampParser(format);
            return new Function<String, DateTime>() {
                @Override
                public DateTime apply(String input) {
                    Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                    return numericFun.apply(Double.parseDouble(ParserUtils.stripQuotes(input)));
                }
            };
        } else {
            try {
                final DateTimeFormatter formatter = DateTimeFormat.forPattern(format);
                return new Function<String, DateTime>() {
                    @Override
                    public DateTime apply(String input) {
                        Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                        return formatter.parseDateTime(ParserUtils.stripQuotes(input));
                    }
                };
            } catch (Exception e) {
                throw new IAE(e, "Unable to parse timestamps with format [%s]", format);
            }
        }
    }

    public static Function<Number, DateTime> createNumericTimestampParser(final String format) {
        // Ignore millis for ruby
        if (format.equalsIgnoreCase("posix") || format.equalsIgnoreCase("ruby")) {
            return new Function<Number, DateTime>() {
                @Override
                public DateTime apply(Number input) {
                    return new DateTime(input.longValue() * 1000);
                }
            };
        } else if (format.equalsIgnoreCase("nano")) {
            return new Function<Number, DateTime>() {
                @Override
                public DateTime apply(Number input) {
                    return new DateTime(input.longValue() / 1000000L);
                }
            };
        } else {
            return new Function<Number, DateTime>() {
                @Override
                public DateTime apply(Number input) {
                    return new DateTime(input.longValue());
                }
            };
        }
    }

    public static Function<Object, DateTime> createObjectTimestampParser(final String format) {
        final Function<String, DateTime> stringFun = createTimestampParser(format);
        final Function<Number, DateTime> numericFun = createNumericTimestampParser(format);

        return new Function<Object, DateTime>() {
            @Override
            public DateTime apply(Object o) {
                Preconditions.checkArgument(o != null, "null timestamp");

                if (o instanceof Number) {
                    return numericFun.apply((Number) o);
                } else {
                    return stringFun.apply(o.toString());
                }
            }
        };
    }
}