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/**
* Jooby https://jooby.io
* Apache License Version 2.0 https://jooby.io/LICENSE.txt
* Copyright 2014 Edgar Espina
*/
package io.jooby;
import io.jooby.exception.MissingValueException;
import io.jooby.exception.TypeMismatchException;
import io.jooby.internal.ArrayValue;
import io.jooby.internal.HashValue;
import io.jooby.internal.MissingValue;
import io.jooby.internal.SingleValue;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeParseException;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
/**
* Unified API for HTTP value. This API plays two role:
*
* - unify access to HTTP values, like query, path, form and header parameter
* - works as validation API, because it is able to check for required and type-safe values
*
* The value API is composed by three types:
*
* - Single value
* - Object value
* - Sequence of values (array)
*
* Single value are can be converted to string, int, boolean, enum like values.
* Object value is a key:value structure (like a hash).
* Sequence of values are index based structure.
*
* All these 3 types are modeled into a single Value class. At any time you can treat a value as
* 1) single, 2) hash or 3) array of them.
*
* @since 2.0.0
* @author edgar
*/
public interface Value {
/**
* Convert this value to long (if possible).
*
* @return Long value.
*/
default long longValue() {
try {
return Long.parseLong(value());
} catch (NumberFormatException x) {
try {
LocalDateTime date = LocalDateTime.parse(value(), Context.RFC1123);
Instant instant = date.toInstant(ZoneOffset.UTC);
return instant.toEpochMilli();
} catch (DateTimeParseException expected) {
}
throw new TypeMismatchException(name(), long.class, x);
}
}
/**
* Convert this value to long (if possible) or fallback to given value when missing.
*
* @param defaultValue Default value.
* @return Convert this value to long (if possible) or fallback to given value when missing.
*/
default long longValue(long defaultValue) {
try {
return longValue();
} catch (MissingValueException x) {
return defaultValue;
}
}
/**
* Convert this value to int (if possible).
*
* @return Int value.
*/
default int intValue() {
try {
return Integer.parseInt(value());
} catch (NumberFormatException x) {
throw new TypeMismatchException(name(), int.class, x);
}
}
/**
* Convert this value to int (if possible) or fallback to given value when missing.
*
* @param defaultValue Default value.
* @return Convert this value to int (if possible) or fallback to given value when missing.
*/
default int intValue(int defaultValue) {
try {
return intValue();
} catch (MissingValueException x) {
return defaultValue;
}
}
/**
* Convert this value to byte (if possible).
*
* @return Convert this value to byte (if possible).
*/
default byte byteValue() {
try {
return Byte.parseByte(value());
} catch (NumberFormatException x) {
throw new TypeMismatchException(name(), byte.class, x);
}
}
/**
* Convert this value to byte (if possible) or fallback to given value when missing.
*
* @param defaultValue Default value.
* @return Convert this value to byte (if possible) or fallback to given value when missing.
*/
default byte byteValue(byte defaultValue) {
try {
return byteValue();
} catch (MissingValueException x) {
return defaultValue;
}
}
/**
* Convert this value to float (if possible).
*
* @return Convert this value to float (if possible).
*/
default float floatValue() {
try {
return Float.parseFloat(value());
} catch (NumberFormatException x) {
throw new TypeMismatchException(name(), float.class, x);
}
}
/**
* Convert this value to float (if possible) or fallback to given value when missing.
*
* @param defaultValue Default value.
* @return Convert this value to float (if possible) or fallback to given value when missing.
*/
default float floatValue(float defaultValue) {
try {
return floatValue();
} catch (MissingValueException x) {
return defaultValue;
}
}
/**
* Convert this value to double (if possible).
*
* @return Convert this value to double (if possible).
*/
default double doubleValue() {
try {
return Double.parseDouble(value());
} catch (NumberFormatException x) {
throw new TypeMismatchException(name(), double.class, x);
}
}
/**
* Convert this value to double (if possible) or fallback to given value when missing.
*
* @param defaultValue Default value.
* @return Convert this value to double (if possible) or fallback to given value when missing.
*/
default double doubleValue(double defaultValue) {
try {
return doubleValue();
} catch (MissingValueException x) {
return defaultValue;
}
}
/**
* Convert this value to boolean (if possible).
*
* @return Convert this value to boolean (if possible).
*/
default boolean booleanValue() {
return Boolean.parseBoolean(value());
}
/**
* Convert this value to boolean (if possible) or fallback to given value when missing.
*
* @param defaultValue Default value.
* @return Convert this value to boolean (if possible) or fallback to given value when missing.
*/
default boolean booleanValue(boolean defaultValue) {
try {
return booleanValue();
} catch (MissingValueException x) {
return defaultValue;
}
}
/**
* Convert this value to String (if possible) or fallback to given value when missing.
*
* @param defaultValue Default value.
* @return Convert this value to String (if possible) or fallback to given value when missing.
*/
@Nonnull default String value(@Nonnull String defaultValue) {
try {
return value();
} catch (MissingValueException x) {
return defaultValue;
}
}
/**
* Convert this value to String (if possible) or <code>null</code> when missing.
*
* @return Convert this value to String (if possible) or <code>null</code> when missing.
*/
@Nullable default String valueOrNull() {
return value((String) null);
}
/**
* Convert value using the given function.
*
* @param fn Function.
* @param <T> Target type.
* @return Converted value.
*/
@Nonnull default <T> T value(@Nonnull SneakyThrows.Function<String, T> fn) {
return fn.apply(value());
}
/**
* Get string value.
*
* @return String value.
*/
@Nonnull String value();
/**
* Get list of values.
*
* @return List of values.
*/
@Nonnull List<String> toList();
/**
* Get set of values.
*
* @return set of values.
*/
@Nonnull Set<String> toSet();
/**
* Convert this value to an Enum.
*
* @param fn Mapping function.
* @param <T> Enum type.
* @return Enum.
*/
@Nonnull default <T extends Enum<T>> T toEnum(@Nonnull SneakyThrows.Function<String, T> fn) {
return toEnum(fn, String::toUpperCase);
}
/**
* Convert this value to an Enum.
*
* @param fn Mapping function.
* @param nameProvider Enum name provider.
* @param <T> Enum type.
* @return Enum.
*/
@Nonnull default <T extends Enum<T>> T toEnum(@Nonnull SneakyThrows.Function<String, T> fn,
@Nonnull Function<String, String> nameProvider) {
return fn.apply(nameProvider.apply(value()));
}
/**
* Get a value or empty optional.
*
* @return Value or empty optional.
*/
@Nonnull default Optional<String> toOptional() {
try {
return Optional.of(value());
} catch (MissingValueException x) {
return Optional.empty();
}
}
/**
* True if this is a single value (not a hash or array).
*
* @return True if this is a single value (not a hash or array).
*/
default boolean isSingle() {
return this instanceof SingleValue;
}
/**
* True for missing values.
*
* @return True for missing values.
*/
default boolean isMissing() {
return this instanceof MissingValue;
}
/**
* True if this value is an array/sequence (not single or hash).
*
* @return True if this value is an array/sequence.
*/
default boolean isArray() {
return this instanceof ArrayValue;
}
/**
* True if this is a hash/object value (not single or array).
*
* @return True if this is a hash/object value (not single or array).
*/
default boolean isObject() {
return this instanceof HashValue;
}
/**
* Name of this value or <code>null</code>.
*
* @return Name of this value or <code>null</code>.
*/
@Nullable String name();
/**
* Get a value or empty optional.
*
* @param type Item type.
* @param <T> Item type.
* @return Value or empty optional.
*/
@Nonnull default <T> Optional<T> toOptional(@Nonnull Class<T> type) {
try {
return Optional.ofNullable(to(type));
} catch (MissingValueException x) {
return Optional.empty();
}
}
/**
* Get list of the given type.
*
* @param type Type to convert.
* @param <T> Item type.
* @return List of items.
*/
@Nonnull default <T> List<T> toList(@Nonnull Class<T> type) {
return Collections.singletonList(to(type));
}
/**
* Get set of the given type.
*
* @param type Type to convert.
* @param <T> Item type.
* @return Set of items.
*/
@Nonnull default <T> Set<T> toSet(@Nonnull Class<T> type) {
return Collections.singleton(to(type));
}
/**
* Convert this value to the given type. Support values are single-value, array-value and
* object-value. Object-value can be converted to a JavaBean type.
*
* @param type Type to convert.
* @param <T> Element type.
* @return Instance of the type.
*/
@Nonnull <T> T to(@Nonnull Class<T> type);
/**
* Value as multi-value map.
*
* @return Value as multi-value map.
*/
@Nullable Map<String, List<String>> toMultimap();
/**
* Value as single-value map.
*
* @return Value as single-value map.
*/
default @Nonnull Map<String, String> toMap() {
Map<String, String> map = new LinkedHashMap<>();
toMultimap().forEach((k, v) -> map.put(k, v.get(0)));
return map;
}
/* ***********************************************************************************************
* Factory methods
* ***********************************************************************************************
*/
/**
* Creates a missing value.
*
* @param name Name of missing value.
* @return Missing value.
*/
static @Nonnull ValueNode missing(@Nonnull String name) {
return new MissingValue(name);
}
/**
* Creates a single value.
*
* @param ctx Current context.
* @param name Name of value.
* @param value Value.
* @return Single value.
*/
static @Nonnull ValueNode value(@Nonnull Context ctx, @Nonnull String name,
@Nonnull String value) {
return new SingleValue(ctx, name, value);
}
/**
* Creates a sequence/array of values.
*
* @param ctx Current context.
* @param name Name of array.
* @param values Field values.
* @return Array value.
*/
static @Nonnull ValueNode array(@Nonnull Context ctx, @Nonnull String name,
@Nonnull List<String> values) {
return new ArrayValue(ctx, name)
.add(values);
}
/**
* Creates a value that fits better with the given values.
*
* - For null/empty values. It produces a missing value.
* - For single element (size==1). It produces a single value
* - For multi-value elements (size>1). It produces an array value.
*
* @param ctx Current context.
* @param name Field name.
* @param values Field values.
* @return A value.
*/
static @Nonnull ValueNode create(Context ctx, @Nonnull String name,
@Nullable List<String> values) {
if (values == null || values.size() == 0) {
return missing(name);
}
if (values.size() == 1) {
return value(ctx, name, values.get(0));
}
return new ArrayValue(ctx, name)
.add(values);
}
/**
* Creates a value that fits better with the given values.
*
* - For null/empty values. It produces a missing value.
* - For single element (size==1). It produces a single value
*
* @param ctx Current context.
* @param name Field name.
* @param value Field values.
* @return A value.
*/
static @Nonnull ValueNode create(Context ctx, @Nonnull String name, @Nullable String value) {
if (value == null) {
return missing(name);
}
return value(ctx, name, value);
}
/**
* Create a hash/object value using the map values.
*
* @param ctx Current context.
* @param values Map values.
* @return A hash/object value.
*/
static @Nonnull ValueNode hash(Context ctx, @Nonnull Map<String, Collection<String>> values) {
HashValue node = new HashValue(ctx, null);
node.put(values);
return node;
}
}