com.ibm.icu.message2.MFFunctionRegistry Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of icu4j Show documentation
Show all versions of icu4j Show documentation
International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
// © 2022 and later: Unicode, Inc. and others.
// License & terms of use: https://www.unicode.org/copyright.html
package com.ibm.icu.message2;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* This class is used to register mappings between various function
* names and the factories that can create those functions.
*
* For example to add formatting for a {@code Person} object one would need to:
*
* - write a function (class, lambda, etc.) that does the formatting proper
* (implementing {@link Formatter})
* - write a factory that creates such a function
* (implementing {@link FormatterFactory})
* - add a mapping from the function name as used in the syntax
* (for example {@code "person"}) to the factory
* - optionally add a mapping from the class to format ({@code ...Person.class}) to
* the formatter name ({@code "person"}), so that one can use a placeholder in the message
* without specifying a function (for example {@code "... {$me} ..."} instead of
* {@code "... {$me :person} ..."}, if the class of {@code $me} is an {@code instanceof Person}).
*
*
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public class MFFunctionRegistry {
private final Map formattersMap;
private final Map selectorsMap;
private final Map, String> classToFormatter;
private MFFunctionRegistry(Builder builder) {
this.formattersMap = new HashMap<>(builder.formattersMap);
this.selectorsMap = new HashMap<>(builder.selectorsMap);
this.classToFormatter = new HashMap<>(builder.classToFormatter);
}
/**
* Creates a builder.
*
* @return the Builder.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public static Builder builder() {
return new Builder();
}
/**
* Returns the formatter factory used to create the formatter for function
* named {@code name}.
*
* Note: function name here means the name used to refer to the function in the
* MessageFormat 2 syntax, for example {@code "... {$exp :datetime} ..."}
* The function name here is {@code "datetime"}, and does not have to correspond to the
* name of the methods / classes used to implement the functionality.
*
* For example one might write a {@code PersonFormatterFactory} returning a {@code PersonFormatter},
* and map that to the MessageFormat function named {@code "person"}.
* The only name visible to the users of MessageFormat syntax will be {@code "person"}.
*
* @param formatterName the function name.
* @return the factory creating formatters for {@code name}. Returns {@code null} if none is registered.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public FormatterFactory getFormatter(String formatterName) {
return formattersMap.get(formatterName);
}
/**
* Get all know names that have a mappings from name to {@link FormatterFactory}.
*
* @return a set of all the known formatter names.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Set getFormatterNames() {
return formattersMap.keySet();
}
/**
* Returns the name of the formatter used to format an object of type {@code clazz}.
*
* @param clazz the class of the object to format.
* @return the name of the formatter class, if registered. Returns {@code null} otherwise.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public String getDefaultFormatterNameForType(Class clazz) {
// Search for the class "as is", to save time.
// If we don't find it then we iterate the registered classes and check
// if the class is an instanceof the ones registered.
// For example a BuddhistCalendar when we only registered Calendar
String result = classToFormatter.get(clazz);
if (result != null) {
return result;
}
// We didn't find the class registered explicitly "as is"
for (Map.Entry, String> e : classToFormatter.entrySet()) {
if (e.getKey().isAssignableFrom(clazz)) {
return e.getValue();
}
}
return null;
}
/**
* Get all know classes that have a mappings from class to function name.
*
* @return a set of all the known classes that have mapping to function names.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Set> getDefaultFormatterTypes() {
return classToFormatter.keySet();
}
/**
* Returns the selector factory used to create the selector for function
* named {@code name}.
*
* Note: the same comments about naming as the ones on {@code getFormatter} apply.
*
* @param selectorName the selector name.
* @return the factory creating selectors for {@code name}. Returns {@code null} if none is registered.
* @see #getFormatter(String)
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public SelectorFactory getSelector(String selectorName) {
return selectorsMap.get(selectorName);
}
/**
* Get all know names that have a mappings from name to {@link SelectorFactory}.
*
* @return a set of all the known selector names.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Set getSelectorNames() {
return selectorsMap.keySet();
}
/**
* A {@code Builder} used to build instances of {@link MFFunctionRegistry}.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public static class Builder {
private final Map formattersMap = new HashMap<>();
private final Map selectorsMap = new HashMap<>();
private final Map, String> classToFormatter = new HashMap<>();
// Prevent direct creation
private Builder() {}
/**
* Adds all the mapping from another registry to this one.
*
* @param functionRegistry the registry to copy from.
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder addAll(MFFunctionRegistry functionRegistry) {
formattersMap.putAll(functionRegistry.formattersMap);
selectorsMap.putAll(functionRegistry.selectorsMap);
classToFormatter.putAll(functionRegistry.classToFormatter);
return this;
}
/**
* Adds a mapping from a formatter name to a {@link FormatterFactory}.
*
* @param formatterName the function name (as used in the MessageFormat 2 syntax).
* @param formatterFactory the factory that handles the name.
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder setFormatter(String formatterName, FormatterFactory formatterFactory) {
formattersMap.put(formatterName, formatterFactory);
return this;
}
/**
* Remove the formatter associated with the name.
*
* @param formatterName the name of the formatter to remove.
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder removeFormatter(String formatterName) {
formattersMap.remove(formatterName);
return this;
}
/**
* Remove all the formatter mappings.
*
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder clearFormatters() {
formattersMap.clear();
return this;
}
/**
* Adds a mapping from a type to format to a {@link FormatterFactory} formatter name.
*
* @param clazz the class of the type to format.
* @param formatterName the formatter name (as used in the MessageFormat 2 syntax).
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder setDefaultFormatterNameForType(Class clazz, String formatterName) {
classToFormatter.put(clazz, formatterName);
return this;
}
/**
* Remove the function name associated with the class.
*
* @param clazz the class to remove the mapping for.
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder removeDefaultFormatterNameForType(Class clazz) {
classToFormatter.remove(clazz);
return this;
}
/**
* Remove all the class to formatter-names mappings.
*
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder clearDefaultFormatterNames() {
classToFormatter.clear();
return this;
}
/**
* Adds a mapping from a selector name to a {@link SelectorFactory}.
*
* @param selectorName the function name (as used in the MessageFormat 2 syntax).
* @param selectorFactory the factory that handles the name.
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder setSelector(String selectorName, SelectorFactory selectorFactory) {
selectorsMap.put(selectorName, selectorFactory);
return this;
}
/**
* Remove the selector associated with the name.
*
* @param selectorName the name of the selector to remove.
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder removeSelector(String selectorName) {
selectorsMap.remove(selectorName);
return this;
}
/**
* Remove all the selector mappings.
*
* @return the builder, for fluent use.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public Builder clearSelectors() {
selectorsMap.clear();
return this;
}
/**
* Builds an instance of {@link MFFunctionRegistry}.
*
* @return the function registry created.
*
* @internal ICU 72 technology preview
* @deprecated This API is for technology preview only.
*/
@Deprecated
public MFFunctionRegistry build() {
return new MFFunctionRegistry(this);
}
}
}