| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.sis.internal.converter; |
| |
| import java.util.Date; |
| import java.util.Set; |
| import java.util.EnumSet; |
| import org.apache.sis.util.ObjectConverter; |
| import org.apache.sis.math.FunctionProperty; |
| |
| |
| /** |
| * Handles conversions from {@link Date} to various objects. |
| * |
| * <div class="section">String representation</div> |
| * There is currently no converter between {@link String} and {@link java.util.Date} because the |
| * date format is not yet defined (we are considering the ISO format for a future SIS version). |
| * |
| * <div class="section">Special cases</div> |
| * The converter from dates to timestamps is not injective, because the same date could be mapped |
| * to many timestamps since timestamps have an additional nanoseconds field. |
| * |
| * <div class="section">Immutability and thread safety</div> |
| * This base class and all inner classes are immutable, and thus inherently thread-safe. |
| * |
| * @author Martin Desruisseaux (Geomatys) |
| * @version 0.3 |
| * @since 0.3 |
| * @module |
| */ |
| abstract class DateConverter<T> extends SystemConverter<Date,T> { |
| /** |
| * For cross-version compatibility. |
| */ |
| private static final long serialVersionUID = 945435736679371963L; |
| |
| /** |
| * The inverse converter. Must be initialized by subclass constructors. |
| */ |
| SystemConverter<T, Date> inverse; |
| |
| /** |
| * Creates a converter for the given target type. |
| * Subclasses must initialize {@link #inverse}. |
| */ |
| DateConverter(final Class<T> targetClass) { |
| super(Date.class, targetClass); |
| } |
| |
| /** |
| * Returns the function properties. |
| */ |
| @Override |
| public Set<FunctionProperty> properties() { |
| return EnumSet.of(FunctionProperty.SURJECTIVE, FunctionProperty.ORDER_PRESERVING, |
| FunctionProperty.INVERTIBLE); |
| } |
| |
| /** |
| * Returns the inverse converter. |
| */ |
| @Override |
| public final ObjectConverter<T, Date> inverse() { |
| return inverse; |
| } |
| |
| /** |
| * Converter from {@code Long} to {@code Date}. |
| * This converter is <strong>not</strong> registered by {@link ConverterRegistry#initialize()}. |
| * Instead, {@link SystemRegistry} will fetch it when first needed by looking at the inverse |
| * of {@link DateConverter.Long}. The same is true for all inverse converters defined in the |
| * {@code DateConverter} enclosing class. |
| */ |
| private static final class Inverse extends SystemConverter<java.lang.Long, java.util.Date> { |
| private static final long serialVersionUID = 5022624034871426299L; |
| |
| private final SystemConverter<java.util.Date, java.lang.Long> inverse; |
| |
| Inverse(final SystemConverter<java.util.Date, java.lang.Long> inverse) { |
| super(java.lang.Long.class, java.util.Date.class); |
| this.inverse = inverse; |
| } |
| |
| @Override public ObjectConverter<java.util.Date, java.lang.Long> inverse() { |
| return inverse; |
| } |
| |
| @Override public ObjectConverter<java.lang.Long, Date> unique() { |
| return inverse.inverse(); |
| } |
| |
| @Override public Set<FunctionProperty> properties() { |
| return inverse.properties(); |
| } |
| |
| @Override public java.util.Date apply(final java.lang.Long target) { |
| return (target != null) ? new java.util.Date(target) : null; |
| } |
| } |
| |
| /** |
| * Converter from {@code Date} to {@code Long}. |
| */ |
| public static final class Long extends DateConverter<java.lang.Long> { |
| private static final long serialVersionUID = 5145114630594761657L; |
| |
| public Long() { // Instantiated by ServiceLoader. |
| super(java.lang.Long.class); |
| inverse = new Inverse(this); |
| } |
| |
| @Override public Set<FunctionProperty> properties() { |
| return bijective(); |
| } |
| |
| @Override public java.lang.Long apply(final Date source) { |
| return (source != null) ? source.getTime() : null; |
| } |
| } |
| |
| /** |
| * From {@code Date} to SQL {@code Date}. |
| * The inverse of this converter is the identity conversion. |
| */ |
| public static final class SQL extends DateConverter<java.sql.Date> { |
| private static final long serialVersionUID = -7444502675467008640L; |
| |
| public SQL() { // Instantiated by ServiceLoader. |
| super(java.sql.Date.class); |
| inverse = new IdentityConverter<>(targetClass, Date.class, this); |
| } |
| |
| @Override public java.sql.Date apply(final Date source) { |
| if (source == null || source instanceof java.sql.Date) { |
| return (java.sql.Date) source; |
| } |
| return new java.sql.Date(source.getTime()); |
| } |
| } |
| |
| /** |
| * From {@code Date} to SQL {@code Timestamp}. |
| * The inverse of this converter is the identity conversion. |
| */ |
| public static final class Timestamp extends DateConverter<java.sql.Timestamp> { |
| private static final long serialVersionUID = 7629460512978844462L; |
| |
| public Timestamp() { // Instantiated by ServiceLoader. |
| super(java.sql.Timestamp.class); |
| inverse = new IdentityConverter<>(targetClass, Date.class, this); |
| } |
| |
| @Override public java.sql.Timestamp apply(final Date source) { |
| if (source == null || source instanceof java.sql.Timestamp) { |
| return (java.sql.Timestamp) source; |
| } |
| return new java.sql.Timestamp(source.getTime()); |
| } |
| } |
| |
| /* |
| * We do not yet provide converter to java.time.Instant. If we do so, we need to create an InstantConverter class |
| * doing the inverse conversion. Reminder: java.sql.Date and java.sql.Time are not convertible to Instant (their |
| * Date.toInstant() method throws UnsupportedOperationException), but java.sql.Timestamp is. |
| * |
| * If conversion to/from java.time.Instant is added, see if some code can be shared with |
| * org.apache.sis.filter.ComparisonFunction. |
| */ |
| } |