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/*
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 * file:
 *
 * Copyright (c) 2008-2012, Stephen Colebourne & Michael Nascimento Santos
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package java.time.format;

import java.time.ZoneId;
import java.time.chrono.Chronology;
import java.time.chrono.IsoChronology;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalField;
import java.util.ArrayList;
import java.util.Locale;
import java.util.Objects;
import java.util.Set;
import java.util.function.Consumer;


Context object used during date and time parsing.


This class represents the current state of the parse.
It has the ability to store and retrieve the parsed values and manage optional segments.
It also provides key information to the parsing methods.

 Once parsing is complete, the toUnresolved() is used to obtain the unresolved result data. The toResolved() is used to obtain the resolved result. 
Implementation Requirements:
This class is a mutable context intended for use from a single thread.
Usage of the class is thread-safe within standard parsing as a new instance of this class
is automatically created for each parse and parsing is single-threaded
Since:1.8
/**
 * Context object used during date and time parsing.
 * <p>
 * This class represents the current state of the parse.
 * It has the ability to store and retrieve the parsed values and manage optional segments.
 * It also provides key information to the parsing methods.
 * <p>
 * Once parsing is complete, the {@link #toUnresolved()} is used to obtain the unresolved
 * result data. The {@link #toResolved()} is used to obtain the resolved result.
 *
 * @implSpec
 * This class is a mutable context intended for use from a single thread.
 * Usage of the class is thread-safe within standard parsing as a new instance of this class
 * is automatically created for each parse and parsing is single-threaded
 *
 * @since 1.8
 */
final class DateTimeParseContext {

    
The formatter, not null.

/**
     * The formatter, not null.
     */
    private DateTimeFormatter formatter;
    
Whether to parse using case sensitively.

/**
     * Whether to parse using case sensitively.
     */
    private boolean caseSensitive = true;
    
Whether to parse using strict rules.

/**
     * Whether to parse using strict rules.
     */
    private boolean strict = true;
    
The list of parsed data.

/**
     * The list of parsed data.
     */
    private final ArrayList<Parsed> parsed = new ArrayList<>();
    
List of Consumers to be notified if the Chronology changes.

/**
     * List of Consumers<Chronology> to be notified if the Chronology changes.
     */
    private ArrayList<Consumer<Chronology>> chronoListeners = null;

    
Creates a new instance of the context.

Params:
  • formatter –  the formatter controlling the parse, not null
/**
     * Creates a new instance of the context.
     *
     * @param formatter  the formatter controlling the parse, not null
     */
    DateTimeParseContext(DateTimeFormatter formatter) {
        super();
        this.formatter = formatter;
        parsed.add(new Parsed());
    }

    
Creates a copy of this context.
This retains the case sensitive and strict flags.

/**
     * Creates a copy of this context.
     * This retains the case sensitive and strict flags.
     */
    DateTimeParseContext copy() {
        DateTimeParseContext newContext = new DateTimeParseContext(formatter);
        newContext.caseSensitive = caseSensitive;
        newContext.strict = strict;
        return newContext;
    }

    //-----------------------------------------------------------------------
    
Gets the locale.


This locale is used to control localization in the parse except
where localization is controlled by the DecimalStyle.

Returns:the locale, not null
/**
     * Gets the locale.
     * <p>
     * This locale is used to control localization in the parse except
     * where localization is controlled by the DecimalStyle.
     *
     * @return the locale, not null
     */
    Locale getLocale() {
        return formatter.getLocale();
    }

    
Gets the DecimalStyle.


The DecimalStyle controls the numeric parsing.

Returns:the DecimalStyle, not null
/**
     * Gets the DecimalStyle.
     * <p>
     * The DecimalStyle controls the numeric parsing.
     *
     * @return the DecimalStyle, not null
     */
    DecimalStyle getDecimalStyle() {
        return formatter.getDecimalStyle();
    }

    
Gets the effective chronology during parsing.

Returns:the effective parsing chronology, not null
/**
     * Gets the effective chronology during parsing.
     *
     * @return the effective parsing chronology, not null
     */
    Chronology getEffectiveChronology() {
        Chronology chrono = currentParsed().chrono;
        if (chrono == null) {
            chrono = formatter.getChronology();
            if (chrono == null) {
                chrono = IsoChronology.INSTANCE;
            }
        }
        return chrono;
    }

    //-----------------------------------------------------------------------
    
Checks if parsing is case sensitive.

Returns:true if parsing is case sensitive, false if case insensitive
/**
     * Checks if parsing is case sensitive.
     *
     * @return true if parsing is case sensitive, false if case insensitive
     */
    boolean isCaseSensitive() {
        return caseSensitive;
    }

    
Sets whether the parsing is case sensitive or not.

Params:
  • caseSensitive –  changes the parsing to be case sensitive or not from now on
/**
     * Sets whether the parsing is case sensitive or not.
     *
     * @param caseSensitive  changes the parsing to be case sensitive or not from now on
     */
    void setCaseSensitive(boolean caseSensitive) {
        this.caseSensitive = caseSensitive;
    }

    //-----------------------------------------------------------------------
    
Helper to compare two CharSequence instances. This uses isCaseSensitive(). 
Params:
  • cs1 –  the first character sequence, not null
  • offset1 –  the offset into the first sequence, valid
  • cs2 –  the second character sequence, not null
  • offset2 –  the offset into the second sequence, valid
  • length –  the length to check, valid
Returns:true if equal
/**
     * Helper to compare two {@code CharSequence} instances.
     * This uses {@link #isCaseSensitive()}.
     *
     * @param cs1  the first character sequence, not null
     * @param offset1  the offset into the first sequence, valid
     * @param cs2  the second character sequence, not null
     * @param offset2  the offset into the second sequence, valid
     * @param length  the length to check, valid
     * @return true if equal
     */
    boolean subSequenceEquals(CharSequence cs1, int offset1, CharSequence cs2, int offset2, int length) {
        if (offset1 + length > cs1.length() || offset2 + length > cs2.length()) {
            return false;
        }
        if (isCaseSensitive()) {
            for (int i = 0; i < length; i++) {
                char ch1 = cs1.charAt(offset1 + i);
                char ch2 = cs2.charAt(offset2 + i);
                if (ch1 != ch2) {
                    return false;
                }
            }
        } else {
            for (int i = 0; i < length; i++) {
                char ch1 = cs1.charAt(offset1 + i);
                char ch2 = cs2.charAt(offset2 + i);
                if (ch1 != ch2 && Character.toUpperCase(ch1) != Character.toUpperCase(ch2) &&
                        Character.toLowerCase(ch1) != Character.toLowerCase(ch2)) {
                    return false;
                }
            }
        }
        return true;
    }

    
Helper to compare two char. This uses isCaseSensitive(). 
Params:
  • ch1 –  the first character
  • ch2 –  the second character
Returns:true if equal
/**
     * Helper to compare two {@code char}.
     * This uses {@link #isCaseSensitive()}.
     *
     * @param ch1  the first character
     * @param ch2  the second character
     * @return true if equal
     */
    boolean charEquals(char ch1, char ch2) {
        if (isCaseSensitive()) {
            return ch1 == ch2;
        }
        return charEqualsIgnoreCase(ch1, ch2);
    }

    
Compares two characters ignoring case.

Params:
  • c1 –  the first
  • c2 –  the second
Returns:true if equal
/**
     * Compares two characters ignoring case.
     *
     * @param c1  the first
     * @param c2  the second
     * @return true if equal
     */
    static boolean charEqualsIgnoreCase(char c1, char c2) {
        return c1 == c2 ||
                Character.toUpperCase(c1) == Character.toUpperCase(c2) ||
                Character.toLowerCase(c1) == Character.toLowerCase(c2);
    }

    //-----------------------------------------------------------------------
    
Checks if parsing is strict.


Strict parsing requires exact matching of the text and sign styles.

Returns:true if parsing is strict, false if lenient
/**
     * Checks if parsing is strict.
     * <p>
     * Strict parsing requires exact matching of the text and sign styles.
     *
     * @return true if parsing is strict, false if lenient
     */
    boolean isStrict() {
        return strict;
    }

    
Sets whether parsing is strict or lenient.

Params:
  • strict –  changes the parsing to be strict or lenient from now on
/**
     * Sets whether parsing is strict or lenient.
     *
     * @param strict  changes the parsing to be strict or lenient from now on
     */
    void setStrict(boolean strict) {
        this.strict = strict;
    }

    //-----------------------------------------------------------------------
    
Starts the parsing of an optional segment of the input.

/**
     * Starts the parsing of an optional segment of the input.
     */
    void startOptional() {
        parsed.add(currentParsed().copy());
    }

    
Ends the parsing of an optional segment of the input.

Params:
  • successful –  whether the optional segment was successfully parsed
/**
     * Ends the parsing of an optional segment of the input.
     *
     * @param successful  whether the optional segment was successfully parsed
     */
    void endOptional(boolean successful) {
        if (successful) {
            parsed.remove(parsed.size() - 2);
        } else {
            parsed.remove(parsed.size() - 1);
        }
    }

    //-----------------------------------------------------------------------
    
Gets the currently active temporal objects.

Returns:the current temporal objects, not null
/**
     * Gets the currently active temporal objects.
     *
     * @return the current temporal objects, not null
     */
    private Parsed currentParsed() {
        return parsed.get(parsed.size() - 1);
    }

    
Gets the unresolved result of the parse.

Returns:the result of the parse, not null
/**
     * Gets the unresolved result of the parse.
     *
     * @return the result of the parse, not null
     */
    Parsed toUnresolved() {
        return currentParsed();
    }

    
Gets the resolved result of the parse.

Returns:the result of the parse, not null
/**
     * Gets the resolved result of the parse.
     *
     * @return the result of the parse, not null
     */
    TemporalAccessor toResolved(ResolverStyle resolverStyle, Set<TemporalField> resolverFields) {
        Parsed parsed = currentParsed();
        parsed.chrono = getEffectiveChronology();
        parsed.zone = (parsed.zone != null ? parsed.zone : formatter.getZone());
        return parsed.resolve(resolverStyle, resolverFields);
    }


    //-----------------------------------------------------------------------
    
Gets the first value that was parsed for the specified field.


This searches the results of the parse, returning the first value found
for the specified field. No attempt is made to derive a value.
The field may have an out of range value.
For example, the day-of-month might be set to 50, or the hour to 1000.

Params:
  • field –  the field to query from the map, null returns null
Returns:the value mapped to the specified field, null if field was not parsed
/**
     * Gets the first value that was parsed for the specified field.
     * <p>
     * This searches the results of the parse, returning the first value found
     * for the specified field. No attempt is made to derive a value.
     * The field may have an out of range value.
     * For example, the day-of-month might be set to 50, or the hour to 1000.
     *
     * @param field  the field to query from the map, null returns null
     * @return the value mapped to the specified field, null if field was not parsed
     */
    Long getParsed(TemporalField field) {
        return currentParsed().fieldValues.get(field);
    }

    
Stores the parsed field.


This stores a field-value pair that has been parsed.
The value stored may be out of range for the field - no checks are performed.

Params:
  • field –  the field to set in the field-value map, not null
  • value –  the value to set in the field-value map
  • errorPos –  the position of the field being parsed
  • successPos –  the position after the field being parsed
Returns:the new position
/**
     * Stores the parsed field.
     * <p>
     * This stores a field-value pair that has been parsed.
     * The value stored may be out of range for the field - no checks are performed.
     *
     * @param field  the field to set in the field-value map, not null
     * @param value  the value to set in the field-value map
     * @param errorPos  the position of the field being parsed
     * @param successPos  the position after the field being parsed
     * @return the new position
     */
    int setParsedField(TemporalField field, long value, int errorPos, int successPos) {
        Objects.requireNonNull(field, "field");
        Long old = currentParsed().fieldValues.put(field, value);
        return (old != null && old.longValue() != value) ? ~errorPos : successPos;
    }

    
Stores the parsed chronology.


This stores the chronology that has been parsed.
No validation is performed other than ensuring it is not null.


The list of listeners is copied and cleared so that each
listener is called only once.  A listener can add itself again
if it needs to be notified of future changes.

Params:
  • chrono –  the parsed chronology, not null
/**
     * Stores the parsed chronology.
     * <p>
     * This stores the chronology that has been parsed.
     * No validation is performed other than ensuring it is not null.
     * <p>
     * The list of listeners is copied and cleared so that each
     * listener is called only once.  A listener can add itself again
     * if it needs to be notified of future changes.
     *
     * @param chrono  the parsed chronology, not null
     */
    void setParsed(Chronology chrono) {
        Objects.requireNonNull(chrono, "chrono");
        currentParsed().chrono = chrono;
        if (chronoListeners != null && !chronoListeners.isEmpty()) {
            @SuppressWarnings({"rawtypes", "unchecked"})
            Consumer<Chronology>[] tmp = new Consumer[1];
            Consumer<Chronology>[] listeners = chronoListeners.toArray(tmp);
            chronoListeners.clear();
            for (Consumer<Chronology> l : listeners) {
                l.accept(chrono);
            }
        }
    }

    
Adds a Consumer to the list of listeners to be notified
if the Chronology changes.

Params:
  • listener – a Consumer to be called when Chronology changes
/**
     * Adds a Consumer<Chronology> to the list of listeners to be notified
     * if the Chronology changes.
     * @param listener a Consumer<Chronology> to be called when Chronology changes
     */
    void addChronoChangedListener(Consumer<Chronology> listener) {
        if (chronoListeners == null) {
            chronoListeners = new ArrayList<>();
        }
        chronoListeners.add(listener);
    }

    
Stores the parsed zone.


This stores the zone that has been parsed.
No validation is performed other than ensuring it is not null.

Params:
  • zone –  the parsed zone, not null
/**
     * Stores the parsed zone.
     * <p>
     * This stores the zone that has been parsed.
     * No validation is performed other than ensuring it is not null.
     *
     * @param zone  the parsed zone, not null
     */
    void setParsed(ZoneId zone) {
        Objects.requireNonNull(zone, "zone");
        currentParsed().zone = zone;
    }

    
Stores the parsed leap second.

/**
     * Stores the parsed leap second.
     */
    void setParsedLeapSecond() {
        currentParsed().leapSecond = true;
    }

    //-----------------------------------------------------------------------
    
Returns a string version of the context for debugging.

Returns:a string representation of the context data, not null
/**
     * Returns a string version of the context for debugging.
     *
     * @return a string representation of the context data, not null
     */
    @Override
    public String toString() {
        return currentParsed().toString();
    }

}