# Class Builder<B extends Builder<B>>

Object
Builder<B>

Type Parameters:
  `B` - the builder subclass.

Direct Known Subclasses:
  `ParameterBuilder`

public abstract class Builder<B extends Builder<B>> extends Object
Base class of builders for various kinds of `IdentifiedObject`. This class provides convenience methods for filling the `properties` map to be given to an `ObjectFactory`. The main properties are:

- Name:
  each `IdentifiedObject` shall have a name, which can be specified by a call to any of the `addName(…)` methods defined in this class.
- Aliases:
  `IdentifiedObject`s can optionally have an arbitrary number of aliases, which are also specified by the `addName(…)` methods. Each call after the first one adds an alias.
- Identifiers:
  `IdentifiedObject`s can also have an arbitrary number of identifiers, which are specified by any of the `addIdentifier(…)` methods. Like names, more than one identifier can be added by invoking the method many time.
- Code space:
  `IdentifiedObject` names and identifiers can be local to a code space defined by an authority. Both the authority and code space can be specified by the `setCodeSpace(Citation, String)` method, and usually (but not necessarily) apply to all `Identifier` instances.
- Version:
  `Identifier`s can optionally have a version specified by the `setVersion(String)` method. The version usually (but not necessarily) applies to all `Identifier` instances.
- Description:
  `Identifier`s can optionally have a description specified by the `setDescription(CharSequence)` method. The description applies only to the next identifier to create.
- Remarks:
  `IdentifiedObject`s can have at most one remark, which is specified by the `code setRemarks(…)` method.

## Namespaces and scopes

The `addName(…)` and `addIdentifier(…)` methods come in three flavors:

- The `addIdentifier(String)` and `addName(CharSequence)` methods combine the given argument with the above-cited authority, code space, version and description information. The result is a local name or identifier, in which the code space information is stored but not shown by the `toString()` method.
- The `addIdentifier(Citation, String)` and `addName(Citation, CharSequence)` methods use the given `Citation` argument, ignoring any authority or code space information given to this `Builder`. The result is a scoped name or identifier, in which the code space information is shown by the `toString()` method.
- The `addIdentifier(ReferenceIdentifier)`, `addName(ReferenceIdentifier)` and `addName(GenericName)` methods take the given object as-is. Any authority, code space, version or description information given to the `Builder` are ignored.

## Example

The EPSG database defines a projection named Mercator (variant A) (EPSG:9804). This projection was named Mercator (1SP) in older EPSG database versions. The same projection was also named "`Mercator_1SP`" by OGC some specifications. If we choose EPSG as our primary naming authority, then those three names can be declared as below:

    builder.setCodespace (Citations.EPSG, "EPSG")
           .addName("Mercator (variant A)")
           .addName("Mercator (1SP)")
           .addName(Citations.OGC, "Mercator_1SP")

The `toString()` representation of those three names are `"Mercator (variant A)"`, `"Mercator (1SP)"` (note the absence of `"EPSG:"` prefix, which is stored as the name scope but not shown) and `"OGC:Mercator_1SP"` respectively.

## Builder property lifetimes

Some complex objects require the creation of many components. For example, constructing a Coordinate Reference System (CRS) may require constructing a coordinate system, a datum and an ellipsoid among other components. However, all those components often (but not necessarily) share the same authority, code space and version information. In order to simplify that common usage, two groups of properties have different lifetimes in the `Builder` class:

- Authority, code space and version:
  Kept until they are specified again, because those properties are typically shared by all components.
- Name, aliases, identifiers, description and remarks:
  Cleared after each call to a `createXXX(…)` method, because those properties are usually specific to a particular `IdentifiedObject` or `Identifier` instance.

## Usage examples

See `ParameterBuilder` class javadoc for more examples with the Mercator projection parameters.

## Note for subclass implementers

- The type `<B>` shall be exactly the subclass type. For performance reasons, this is verified only if Java assertions are enabled.
- All `createXXX(…)` methods shall invoke `onCreate(boolean)` before and after usage of `properties` map by the factory.

Example:

    public class MyBuilder extends Builder<MyBuilder> {
        public Foo createFoo() {
            onCreate(false);
            Foo foo = factory.createFoo(properties);
            onCreate(true);
            return foo;
        }
    }

Since:
  0.4

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `protected final Map<String,Object>`
  `properties`
  The properties to be given to `ObjectFactory` methods.

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `Builder()`
  Creates a new builder.
  `protected`
  `Builder(IdentifiedObject object)`
  Creates a new builder initialized to properties of the given object.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `B`
  `addIdentifier(String identifier)`
  Adds an `IdentifiedObject` identifier given by a `String`.
  `B`
  `addIdentifier(Citation authority, String identifier)`
  Adds an `IdentifiedObject` identifier in an alternative namespace.
  `B`
  `addIdentifier(ReferenceIdentifier identifier)`
  Adds an `IdentifiedObject` identifier fully specified by the given identifier.
  `B`
  `addName(CharSequence name)`
  Adds an `IdentifiedObject` name given by a `String` or `InternationalString`.
  `B`
  `addName(Citation authority, CharSequence name)`
  Adds an `IdentifiedObject` name in an alternative namespace.
  `B`
  `addName(ReferenceIdentifier name)`
  Adds an `IdentifiedObject` name fully specified by the given identifier.
  `B`
  `addName(GenericName name)`
  Adds an `IdentifiedObject` name fully specified by the given generic name.
  `B`
  `addNameAndIdentifier(Citation authority, IdentifiedObject object)`
  Adds the non-deprecated names and identifiers from the given object for the specified authority.
  `B`
  `addNamesAndIdentifiers(IdentifiedObject object)`
  Adds all non-deprecated names and identifiers from the given object.
  `protected void`
  `onCreate(boolean cleanup)`
  Initializes/cleanups the `properties` map before/after a `createXXX(…)` execution.
  `B`
  `reidentify(Citation authority, String... replacements)`
  Replaces the identifiers associated to the given authority by the given new identifiers.
  `B`
  `rename(Citation authority, CharSequence... replacements)`
  Replaces the names associated to the given authority by the given new names.
  `B`
  `setCodeSpace(Citation authority, String codespace)`
  Sets the `Identifier` authority and code space.
  `B`
  `setDeprecated(boolean deprecated)`
  Sets whether the next `GenericName`s, `Identifier`s or `IdentifiedObject`s to create shall be considered deprecated.
  `B`
  `setDescription(CharSequence description)`
  Sets an `Identifier` or `IdentifiedObject` description.
  `B`
  `setRemarks(CharSequence remarks)`
  Sets remarks as a `String` or `InternationalString` instance.
  `B`
  `setVersion(String version)`
  Sets the `Identifier` version of object definitions.

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### properties

    protected final Map<String,Object> properties
    The properties to be given to `ObjectFactory` methods. This map may contain values for the "name", "alias", "identifiers" and "remarks" keys. Subclasses may add other entries like "domainOfValidity" and "scope" keys.

    See Notes for subclass implementers in class javadoc for usage conditions.

    See Also:
      - `onCreate(boolean)`

- ## Constructor Details

  - ### Builder

    protected Builder()
    Creates a new builder.
    Throws:
      `AssertionError` - if assertions are enabled and the `<B>` type is not the type of `this`.

  - ### Builder

    protected Builder(IdentifiedObject object)
    Creates a new builder initialized to properties of the given object. The properties recognized by this constructor are documented here.
    Parameters:
      `object` - the identified object from which to inherit properties, or `null`.
    Since:
      0.6

- ## Method Details

  - ### setCodeSpace

    public B setCodeSpace(Citation authority, String codespace)
    Sets the `Identifier` authority and code space. The code space is often the authority's abbreviation, but not necessarily.
    Example: Coordinate Reference System (CRS) objects identified by codes from the EPSG database are maintained by the International Association of Oil & Gas producers (IOGP) authority, but the code space is `"EPSG"` for historical reasons.
    This method is typically invoked only once, since a compound object often uses the same code space for all individual components.

    Condition: this method cannot be invoked after one or more names or identifiers have been added (by calls to the `addName(…)` or `addIdentifier(…)` methods) for the next object to create. This method can be invoked again after the name, aliases and identifiers have been cleared by a call to `createXXX(…)`.

    Lifetime: this property is kept unchanged until this `setCodeSpace(…)` method is invoked again.

    Parameters:
      `authority` - bibliographic reference to the authority defining the codes, or `null` if none.
      `codespace` - the `IdentifiedObject` codespace, or `null` for inferring it from the authority.
    Returns:
      `this`, for method call chaining.
    Throws:
      `IllegalStateException` - if `addName(…)` or `addIdentifier(…)` has been invoked at least once since builder construction or since the last call to a `createXXX(…)` method.
    See Also:
      - `ImmutableIdentifier​.getAuthority()`
      - `ImmutableIdentifier​.getCodeSpace()`

  - ### setVersion

    public B setVersion(String version)
    Sets the `Identifier` version of object definitions. This method is typically invoked only once, since a compound object often uses the same version for all individual components.

    Condition: this method cannot be invoked after one or more names or identifiers have been added (by calls to the `addName(…)` or `addIdentifier(…)` methods) for the next object to create. This method can be invoked again after the name, aliases and identifiers have been cleared by a call to `createXXX(…)`.

    Lifetime: this property is kept unchanged until this `setVersion(…)` method is invoked again.

    Parameters:
      `version` - the version of code definitions, or `null` if none.
    Returns:
      `this`, for method call chaining.
    Throws:
      `IllegalStateException` - if `addName(…)` or `addIdentifier(…)` has been invoked at least once since builder construction or since the last call to a `createXXX(…)` method.

  - ### addName

    public B addName(CharSequence name)
    Adds an `IdentifiedObject` name given by a `String` or `InternationalString`. The given string will be combined with the authority, code space and version information for creating the `Identifier` or `GenericName` object.

    #### Name and aliases

    This method can be invoked many times. The first invocation sets the primary name, and all subsequent invocations add an alias.

    #### Deprecated names

    Some names may exist for historical reasons but have their use discouraged. If `setDeprecated(true)` has been invoked, then this method creates a deprecated alias with the current remarks. The remark should suggest a replacement, for example with a sentence like Superseded by <new-name>.

    Note that deprecated names are always added as aliases, never as the primary name of an identified object.

    Lifetime: the name and all aliases are cleared after a `createXXX(…)` method has been invoked.

    Parameters:
      `name` - the `IdentifiedObject` name as a `String` or `InternationalString` instance.
    Returns:
      `this`, for method call chaining.

  - ### addName

    public B addName(Citation authority, CharSequence name)
    Adds an `IdentifiedObject` name in an alternative namespace. This method is typically invoked for aliases defined after the primary name.

    #### Example

    The Longitude of natural origin parameter defined by EPSG is named differently by OGC and GeoTIFF. Those alternative names can be defined as below:

        builder.setCodespace(Citations.EPSG, "EPSG")          // Sets the default namespace to "EPSG".
               .addName("Longitude of natural origin")        // Primary name in builder default namespace.
               .addName(Citations.OGC, "central_meridian")    // First alias in "OGC" namespace.
               .addName(Citations.GEOTIFF, "NatOriginLong");  // Second alias in "GeoTIFF" namespace.

    In this example, `"central_meridian"` will be the tip and `"OGC"` will be the head of the first alias.

    #### Lifetime

    The name and all aliases are cleared after a `createXXX(…)` method has been invoked.
    Parameters:
      `authority` - bibliographic reference to the authority defining the codes, or `null` if none.
      `name` - the `IdentifiedObject` alias as a name in the namespace of the given authority.
    Returns:
      `this`, for method call chaining.
    See Also:
      - `addIdentifier(Citation, String)`

  - ### addName

    public B addName(ReferenceIdentifier name)
    Adds an `IdentifiedObject` name fully specified by the given identifier. This method ignores the authority, code space, version and description specified to this builder (if any), since the given identifier may already contain those information.

    #### Name and aliases

    This method can be invoked many times. The first invocation sets the primary name to the given value, and all subsequent invocations add an alias.

    Lifetime: the name and all aliases are cleared after a `createXXX(…)` method has been invoked.

    Parameters:
      `name` - the `IdentifiedObject` name as an identifier.
    Returns:
      `this`, for method call chaining.

  - ### addName

    public B addName(GenericName name)
    Adds an `IdentifiedObject` name fully specified by the given generic name. This method ignores the authority, code space, version and description specified to this builder (if any), since the given generic name may already contain those information.

    #### Name and aliases

    This method can be invoked many times. The first invocation sets the primary name to the given value, and all subsequent invocations add an alias.

    Lifetime: the name and all aliases are cleared after a `createXXX(…)` method has been invoked.

    Parameters:
      `name` - the `IdentifiedObject` name as an identifier.
    Returns:
      `this`, for method call chaining.

  - ### addIdentifier

    public B addIdentifier(String identifier)
    Adds an `IdentifiedObject` identifier given by a `String`. The given string will be combined with the authority, code space version and description information for creating the `Identifier` object.

    #### Deprecated identifiers

    Some identifiers may exist for historical reasons but have their use discouraged. If `setDeprecated(true)` has been invoked, then this method creates a deprecated identifier with the current remarks. The remark should suggest a replacement, for example with a sentence like Superseded by <new-code>.

    Lifetime: all identifiers are cleared after a `createXXX(…)` method has been invoked.

    Parameters:
      `identifier` - the `IdentifiedObject` identifier.
    Returns:
      `this`, for method call chaining.

  - ### addIdentifier

    public B addIdentifier(Citation authority, String identifier)
    Adds an `IdentifiedObject` identifier in an alternative namespace. This method is typically invoked in complement to `addName(Citation, CharSequence)`.

    Lifetime: all identifiers are cleared after a `createXXX(…)` method has been invoked.

    Parameters:
      `authority` - bibliographic reference to the authority defining the codes, or `null` if none.
      `identifier` - the `IdentifiedObject` identifier as a code in the namespace of the given authority.
    Returns:
      `this`, for method call chaining.
    See Also:
      - `addName(Citation, CharSequence)`

  - ### addIdentifier

    public B addIdentifier(ReferenceIdentifier identifier)
    Adds an `IdentifiedObject` identifier fully specified by the given identifier. This method ignores the authority, code space, version and description specified to this builder (if any), since the given identifier already contains those information.

    Lifetime: all identifiers are cleared after a `createXXX(…)` method has been invoked.

    Parameters:
      `identifier` - the `IdentifiedObject` identifier.
    Returns:
      `this`, for method call chaining.

  - ### addNamesAndIdentifiers

    public B addNamesAndIdentifiers(IdentifiedObject object)
    Adds all non-deprecated names and identifiers from the given object. Other properties like description and remarks are ignored.

    This is a convenience method for using an existing object as a template, before to modify some names by calls to `rename(Citation, CharSequence[])`.

    Parameters:
      `object` - the object from which to copy the names and identifiers.
    Returns:
      `this`, for method call chaining.
    Since:
      0.6

  - ### addNameAndIdentifier

    public B addNameAndIdentifier(Citation authority, IdentifiedObject object)
    Adds the non-deprecated names and identifiers from the given object for the specified authority. This is a convenience method for reusing name and identifier already declared for another object.
    Parameters:
      `authority` - the authority for which to copy the name and identifier.
      `object` - the object from which to copy the name and identifier.
    Returns:
      `this`, for method call chaining.
    Since:
      1.1

  - ### rename

    public B rename(Citation authority, CharSequence... replacements)
    Replaces the names associated to the given authority by the given new names. More specifically:
    - The first occurrence of a name associated to `authority` will be replaced by a new name with the same authority and the local part defined by `replacements[0]`.
    - The second occurrence of a name associated to `authority` will be replaced by a new name with the same authority and the local part defined by `replacements[1]`.
    - etc. until one of the following conditions is met:
      - There are no more names associated to the given authority in this `Builder`, in which case new names are inserted for all remaining elements in the `replacements` array.
      - There are no more elements in the `replacements` array, in which case all remaining names associated to the given authority in this `Builder` are removed.
    This method could also be understood as a `setNames(Citation, ...)` method, except that it modifies only the names associated to the given authority and preserves the same order as previous names.
    Parameters:
      `authority` - the authority of the names to replaces.
      `replacements` - the new local parts for the names to replace, or `null` or an empty array for removing all names associated to the given authority.
    Returns:
      `this`, for method call chaining.
    Since:
      0.6

  - ### reidentify

    public B reidentify(Citation authority, String... replacements)
    Replaces the identifiers associated to the given authority by the given new identifiers. More specifically:
    - The first occurrence of an identifier associated to `authority` will be replaced by a new identifier with the same authority and the code defined by `replacements[0]`.
    - The second occurrence of an identifier associated to `authority` will be replaced by a new identifier with the same authority and the local part defined by `replacements[1]`.
    - etc. until one of the following conditions is met:
      - There are no more identifiers associated to the given authority in this `Builder`, in which case new identifiers are inserted for all remaining elements in the `replacements` array.
      - There are no more elements in the `replacements` array, in which case all remaining identifiers associated to the given authority in this `Builder` are removed.
    This method could also be understood as a `setIdentifiers(Citation, ...)` method, except that it modifies only the identifiers associated to the given authority and preserves the same order as previous identifiers.
    Parameters:
      `authority` - the authority of the names to replaces.
      `replacements` - the new local parts for the names to replace, or `null` or an empty array for removing all names associated to the given authority.
    Returns:
      `this`, for method call chaining.
    Since:
      0.8

  - ### setDescription

    public B setDescription(CharSequence description)
    Sets an `Identifier` or `IdentifiedObject` description. Descriptions can be used in various contexts:
    - Before calls to `addIdentifier(String)` or `addIdentifier(Citation, String)` for specifying a natural language description of the meaning of the code value.
      Example: `setDescription("World Geodetic System 1984").addIdentifier("4326")`
    - Before calls to a `createXXX(…)` method for providing a narrative explanation of the role of the object. Not all `IdentifiedObject` supports description.
    Calls to this method overwrite any previous value.

    Lifetime: previous descriptions are discarded by calls to `setDescription(…)`. Descriptions are cleared after a `createXXX(…)` method has been invoked.

    Parameters:
      `description` - the description as a `String` or `InternationalString` instance, or `null` if none.
    Returns:
      `this`, for method call chaining.
    See Also:
      - `ImmutableIdentifier​.getDescription()`

  - ### setRemarks

    public B setRemarks(CharSequence remarks)
    Sets remarks as a `String` or `InternationalString` instance. Calls to this method overwrite any previous value.

    Lifetime: previous remarks are discarded by calls to `setRemarks(…)`. Remarks are cleared after a `createXXX(…)` method has been invoked.

    Parameters:
      `remarks` - the remarks as a `String` or `InternationalString` instance, or `null` if none.
    Returns:
      `this`, for method call chaining.

  - ### setDeprecated

    public B setDeprecated(boolean deprecated)
    Sets whether the next `GenericName`s, `Identifier`s or `IdentifiedObject`s to create shall be considered deprecated. Deprecated objects exist in some authority factories like the EPSG database.

    Lifetime: Deprecation status is cleared after a `createXXX(…)` method has been invoked.

    Parameters:
      `deprecated` - `true` if the next names, identifiers and identified objects should be considered deprecated, or `false` otherwise.
    Returns:
      `this`, for method call chaining.
    Since:
      0.6
    See Also:
      - `AbstractIdentifiedObject​.isDeprecated()`

  - ### onCreate

    protected void onCreate(boolean cleanup)
    Initializes/cleanups the `properties` map before/after a `createXXX(…)` execution. Subclasses shall invoke this method in their `createXXX(…)` methods as below:

            public Foo createFoo() {
                final Foo foo;
                onCreate(false);
                try {
                    foo = factory.createFoo(properties);
                } finally {
                    onCreate(true);
                }
                return foo;
            }

    If `cleanup` is `true`, then this method clears the identification information (name, aliases, identifiers, description, remarks and deprecation status) for preparing the builder to the construction of another object. The authority, codespace and version properties are not cleared by this method.
    Parameters:
      `cleanup` - `false` when this method is invoked before object creation, and `true` when this method is invoked after object creation.
    See Also:
      - `properties`