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POJava DateTime is a simple, light-weight Java-based API for parsing and manipulating dates. It parses dates from most languages and formats out of the box without having to specify which format is expected. Defaults such as time zones, and whether to interpret an internationally ambiguous date like "03/06/2014" as DMY order or MDY order are inferred by system time zone and locale and stored in a default config object that can be replaced or overridden. Multiple languages for month names are supported without any additional configuration needed.

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package org.pojava.datetime;

import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;

/**
 * LocalConfig is a wrapper class providing a cheap equivalent to the global instance of
 * DateTimeConfig with one or more methods (e.g. TimeZone) overridden.
 */
public class LocalConfig implements IDateTimeConfig {
    private TimeZone inputTimeZone;
    private TimeZone outputTimeZone;
    private IDateTimeConfig config;

    public static LocalConfig instanceOverridingOutputTimeZone(IDateTimeConfig baseConfig, TimeZone outputTimeZone) {
        return new LocalConfig(baseConfig, baseConfig.getInputTimeZone(), outputTimeZone);
    }

    public static LocalConfig instanceOverridingTimeZones(IDateTimeConfig baseConfig, TimeZone inputTimeZone, TimeZone outputTimeZone) {
        return new LocalConfig(baseConfig, inputTimeZone, outputTimeZone);
    }

    protected LocalConfig(IDateTimeConfig config, TimeZone inputTimeZone, TimeZone outputTimeZone) {
        this.config = config;
        this.inputTimeZone = inputTimeZone;
        this.outputTimeZone = outputTimeZone;
    }

    @Override
    public boolean isDmyOrder() {
        return config.isDmyOrder();
    }

    @Override
    public Map getTzMap() {
        return config.getTzMap();
    }

    @Override
    public TimeZone getInputTimeZone() {
        return inputTimeZone;
    }

    @Override
    public TimeZone getOutputTimeZone() {
        return outputTimeZone;
    }

    @Override
    public Locale getLocale() {
        return config.getLocale();
    }

    @Override
    public String getFormat() {
        return config.getFormat();
    }

    @Override
    public String getBcPrefix() {
        return config.getBcPrefix();
    }

    @Override
    public int getEpochDOW() {
        return config.getEpochDOW();
    }

    @Override
    /**
     * Lookup the TimeZone, including custom time zones.
     */
    public TimeZone lookupTimeZone(String id) {
        return config.lookupTimeZone(id, inputTimeZone);
    }

    @Override
    /**
     * Lookup the TimeZone, including custom time zones.
     */
    public TimeZone lookupTimeZone(String id, TimeZone defaultTimeZone) {
        return config.lookupTimeZone(id, defaultTimeZone);
    }

    @Override
    public Integer lookupMonthIndex(String monthNameOrAbbreviation) {
        return config.lookupMonthIndex(monthNameOrAbbreviation);
    }

    @Override
    public boolean isUnspecifiedCenturyAlwaysInPast() {
        return config.isUnspecifiedCenturyAlwaysInPast();
    }

    @Override
    public long systemTime() {
        return config.systemTime();
    }

    @Override
    public void validate() {
        config.validate();
    }
}