本文整理了Java中java.time.temporal.TemporalQueries.localDate()方法的一些代码示例，展示了TemporalQueries.localDate()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。TemporalQueries.localDate()方法的具体详情如下：
包路径：java.time.temporal.TemporalQueries
类名称：TemporalQueries
方法名：localDate

TemporalQueries.localDate介绍

[英]A query for LocalDate returning null if not found.

This returns a TemporalQuery that can be used to query a temporal object for the local date. The query will return null if the temporal object cannot supply a local date.

The query implementation examines the ChronoField#EPOCH_DAYfield and uses it to create a LocalDate.
[中]如果找不到LocalDate，则返回null的查询。
这将返回一个临时查询，可用于查询本地日期的临时对象。如果时态对象不能提供本地日期，查询将返回null。
查询实现检查ChronoField#EPOCH_DAYfield并使用它创建LocalDate。

代码示例

代码示例来源：origin: neo4j/neo4j

final LocalDate expectedDate = ((Temporal) expectedValue).query( TemporalQueries.localDate() );
final LocalTime expectedTime = ((Temporal) expectedValue).query( TemporalQueries.localTime() );
final ZoneId expectedZoneId = ((Temporal) expectedValue).query( TemporalQueries.zone() );
  LocalDate actualDate = ((Temporal) actualValue).query( TemporalQueries.localDate() );
  LocalTime actualTime = ((Temporal) actualValue).query( TemporalQueries.localTime() );
  ZoneId actualZoneId = ((Temporal) actualValue).query( TemporalQueries.zone() );

代码示例来源：origin: org.threeten/threeten-extra

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.localDate()) {
    return (R) isoDate;
  }
  return super.query(query);
}

代码示例来源：origin: com.nhl.link.rest/link-rest-base

private Optional<LocalDate> getLocalDate(TemporalAccessor parsed) {
  return Optional.ofNullable(parsed.query(TemporalQueries.localDate()));
}

代码示例来源：origin: agrestio/agrest

private Optional<LocalDate> getLocalDate(TemporalAccessor parsed) {
  return Optional.ofNullable(parsed.query(TemporalQueries.localDate()));
}

代码示例来源：origin: com.github.seratch/java-time-backport

/**
 * Queries this date-time using the specified query.
 * <p>
 * This queries this date-time using the specified query strategy object.
 * The {@code TemporalQuery} object defines the logic to be used to
 * obtain the result. Read the documentation of the query to understand
 * what the result of this method will be.
 * <p>
 * The result of this method is obtained by invoking the
 * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
 * specified query passing {@code this} as the argument.
 *
 * @param <R> the type of the result
 * @param query  the query to invoke, not null
 * @return the query result, null may be returned (defined by the query)
 * @throws DateTimeException if unable to query (defined by the query)
 * @throws ArithmeticException if numeric overflow occurs (defined by the query)
 */
@SuppressWarnings("unchecked")
@Override  // override for Javadoc
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.localDate()) {
    return (R) toLocalDate();
  }
  return super.query(query);
}

代码示例来源：origin: com.github.seratch/java-time-backport

/**
 * Queries this date using the specified query.
 * <p>
 * This queries this date using the specified query strategy object.
 * The {@code TemporalQuery} object defines the logic to be used to
 * obtain the result. Read the documentation of the query to understand
 * what the result of this method will be.
 * <p>
 * The result of this method is obtained by invoking the
 * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
 * specified query passing {@code this} as the argument.
 *
 * @param <R> the type of the result
 * @param query  the query to invoke, not null
 * @return the query result, null may be returned (defined by the query)
 * @throws DateTimeException if unable to query (defined by the query)
 * @throws ArithmeticException if numeric overflow occurs (defined by the query)
 */
@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.localDate()) {
    return (R) this;
  }
  return super.query(query);
}

代码示例来源：origin: com.github.seratch/java-time-backport

/**
 * Obtains an instance of {@code LocalDate} from a temporal object.
 * <p>
 * A {@code TemporalAccessor} represents some form of date and time information.
 * This factory converts the arbitrary temporal object to an instance of {@code LocalDate}.
 * <p>
 * The conversion uses the {@link TemporalQueries#localDate()} query, which relies
 * on extracting the {@link ChronoField#EPOCH_DAY EPOCH_DAY} field.
 * <p>
 * This method matches the signature of the functional interface {@link TemporalQuery}
 * allowing it to be used as a query via method reference, {@code LocalDate::from}.
 *
 * @param temporal  the temporal object to convert, not null
 * @return the local date, not null
 * @throws DateTimeException if unable to convert to a {@code LocalDate}
 */
public static LocalDate from(TemporalAccessor temporal) {
  LocalDate date = temporal.query(TemporalQueries.localDate());
  if (date == null) {
    throw new DateTimeException("Unable to obtain LocalDate from TemporalAccessor: " +
        temporal + ", type " + temporal.getClass().getName());
  }
  return date;
}

代码示例来源：origin: eXparity/hamcrest-date

@Override
protected boolean matchesSafely(final T actual, final Description mismatchDesc) {
  if (!this.adapter.asTemporal(actual, zone).query(localDate()).isLeapYear()) {
    mismatchDesc.appendText("the date " + this.formatter.describe(actual) + " is not a leap year");
    return false;
  } else {
    return true;
  }
}

代码示例来源：origin: com.github.seratch/java-time-backport

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.precision()) {
    return (R) ChronoUnit.ERAS;
  }
  if (query == TemporalQueries.chronology() || query == TemporalQueries.zone() ||
      query == TemporalQueries.zoneId() || query == TemporalQueries.offset() ||
      query == TemporalQueries.localDate() || query == TemporalQueries.localTime()) {
    return null;
  }
  return query.queryFrom(this);
}

代码示例来源：origin: com.github.seratch/java-time-backport

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.precision()) {
    return (R) ChronoUnit.ERAS;
  }
  if (query == TemporalQueries.chronology() || query == TemporalQueries.zone() ||
      query == TemporalQueries.zoneId() || query == TemporalQueries.offset() ||
      query == TemporalQueries.localDate() || query == TemporalQueries.localTime()) {
    return null;
  }
  return query.queryFrom(this);
}

代码示例来源：origin: com.github.seratch/java-time-backport

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.precision()) {
    return (R) ChronoUnit.ERAS;
  }
  if (query == TemporalQueries.chronology() || query == TemporalQueries.zone() ||
      query == TemporalQueries.zoneId() || query == TemporalQueries.offset() ||
      query == TemporalQueries.localDate() || query == TemporalQueries.localTime()) {
    return null;
  }
  return query.queryFrom(this);
}

代码示例来源：origin: com.github.seratch/java-time-backport

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.precision()) {
    return (R) ChronoUnit.ERAS;
  }
  if (query == TemporalQueries.chronology() || query == TemporalQueries.zone() ||
      query == TemporalQueries.zoneId() || query == TemporalQueries.offset() ||
      query == TemporalQueries.localDate() || query == TemporalQueries.localTime()) {
    return null;
  }
  return query.queryFrom(this);
}

代码示例来源：origin: com.github.seratch/java-time-backport

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.precision()) {
    return (R) ChronoUnit.ERAS;
  }
  if (query == TemporalQueries.chronology() || query == TemporalQueries.zone() ||
      query == TemporalQueries.zoneId() || query == TemporalQueries.offset() ||
      query == TemporalQueries.localDate() || query == TemporalQueries.localTime()) {
    return null;
  }
  return query.queryFrom(this);
}

代码示例来源：origin: com.github.seratch/java-time-backport

query == TemporalQueries.localDate()) {
return null;

代码示例来源：origin: com.github.seratch/java-time-backport

} else if (query == TemporalQueries.precision()) {
  return (R) MONTHS;
} else if (query == TemporalQueries.localDate() || query == TemporalQueries.localTime() ||
    query == TemporalQueries.zone() || query == TemporalQueries.zoneId() || query == TemporalQueries.offset()) {
  return null;

代码示例来源：origin: youtongluan/sumk

@Override
public SumkDate queryFrom(TemporalAccessor temporal) {
  if (temporal instanceof LocalDateTime) {
    return SumkDate.of((LocalDateTime) temporal);
  } else if (temporal instanceof ZonedDateTime) {
    LocalDateTime dt = ((ZonedDateTime) temporal).toLocalDateTime();
    return SumkDate.of(dt);
  } else if (temporal instanceof OffsetDateTime) {
    LocalDateTime dt = ((OffsetDateTime) temporal).toLocalDateTime();
    return SumkDate.of(dt);
  }
  LocalDate date = temporal.query(TemporalQueries.localDate());
  LocalTime time = temporal.query(TemporalQueries.localTime());
  if (date == null && time == null) {
    return null;
  }
  return SumkDate.of(date, time);
}

代码示例来源：origin: com.github.seratch/java-time-backport

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.chronology()) {
    return (R) getChronology();
  } else if (query == TemporalQueries.precision()) {
    return (R) ChronoUnit.DAYS;
  } else if (query == TemporalQueries.localDate()) {
    return (R) LocalDate.ofEpochDay(toEpochDay());
  } else if (query == TemporalQueries.localTime() || query == TemporalQueries.zone() ||
      query == TemporalQueries.zoneId() || query == TemporalQueries.offset()) {
    return null;
  }
  return super.query(query);
}

代码示例来源：origin: com.github.seratch/java-time-backport

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.zoneId()) {
    return (R) zone;
  } else if (query == TemporalQueries.chronology()) {
    return (R) chrono;
  } else if (query == TemporalQueries.localDate()) {
    return date != null ? (R) LocalDate.from(date) : null;
  } else if (query == TemporalQueries.localTime()) {
    return (R) time;
  } else if (query == TemporalQueries.zone() || query == TemporalQueries.offset()) {
    return query.queryFrom(this);
  } else if (query == TemporalQueries.precision()) {
    return null;  // not a complete date/time
  }
  // inline TemporalAccessor.super.query(query) as an optimization
  // non-JDK classes are not permitted to make this optimization
  return query.queryFrom(this);
}

代码示例来源：origin: com.github.seratch/java-time-backport

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.chronology()) {
    return (R) getChronology();
  } else if (query == TemporalQueries.precision()) {
    return (R) NANOS;
  } else if (query == TemporalQueries.localDate()) {
    return (R) LocalDate.ofEpochDay(toLocalDate().toEpochDay());
  } else if (query == TemporalQueries.localTime()) {
    return (R) toLocalTime();
  } else if (query == TemporalQueries.zone() || query == TemporalQueries.zoneId() || query == TemporalQueries.offset()) {
    return null;
  }
  return super.query(query);
}

代码示例来源：origin: com.github.seratch/java-time-backport

@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
  if (query == TemporalQueries.zoneId() || query == TemporalQueries.zone()) {
    return (R) getZone();
  } else if (query == TemporalQueries.chronology()) {
    return (R) toLocalDate().getChronology();
  } else if (query == TemporalQueries.precision()) {
    return (R) NANOS;
  } else if (query == TemporalQueries.offset()) {
    return (R) getOffset();
  } else if (query == TemporalQueries.localDate()) {
    return (R) LocalDate.ofEpochDay(toLocalDate().toEpochDay());
  } else if (query == TemporalQueries.localTime()) {
    return (R) toLocalTime();
  }
  return super.query(query);
}