class Config
An immutable map from config paths to config values. Paths are
dot-separated expressions such as foo.bar.baz
. Values are as
in JSON (booleans, strings, numbers, lists, or objects), represented by
{@link ConfigValue} instances. Values accessed through the
Config
interface are never null.
<p> {@code Config} is an immutable object and thus safe to use from multiple threads. There's never a need for “defensive copies.”
<p> Fundamental operations on a {@code Config} include getting configuration values, resolving substitutions with {@link #resolve}, and merging configs using {@link Config#withFallback(ConfigMergeable)}.
<p> All operations return a new immutable {@code Config} rather than modifying the original instance.
<p> <strong>Examples</strong>
<p> You can find an example app and library <a href=“on”>github.com/typesafehub/config/tree/master/examples“>on GitHub</a>. Also be sure to read the <a href=”package-summary.html#package_description“>package overview</a> which describes the big picture as shown in those examples.
<p> <strong>Paths, keys, and Config vs. ConfigObject</strong>
<p> Config
is a view onto a tree of {@link
ConfigObject}; the corresponding object tree can be found through {@link #root}. ConfigObject
is a
map from config keys, rather than paths, to config values. Think
of ConfigObject
as a JSON object and Config
as a
configuration API.
<p> The API tries to consistently use the terms “key” and “path.” A key is a key in a JSON object; it's just a string that's the key in a map. A “path” is a parseable expression with a syntax and it refers to a series of keys. Path expressions are described in the <a href=“spec”>github.com/typesafehub/config/blob/master/HOCON.md“>spec for Human-Optimized Config Object Notation</a>. In brief, a path is period-separated so ”a.b.c“ looks for key c in object b in object a in the root object. Sometimes double quotes are needed around special characters in path expressions.
<p> The API for a {@code Config} is in terms of path expressions, while the API for a {@code ConfigObject} is in terms of keys. Conceptually, {@code Config} is a one-level map from paths to values, while a {@code ConfigObject} is a tree of nested maps from keys to values.
<p> Use {@link ConfigUtil#joinPath} and {@link ConfigUtil#splitPath} to convert between path expressions and individual path elements (keys).
<p> Another difference between {@code Config} and {@code ConfigObject} is that conceptually, {@code ConfigValue}s with a {@link ConfigValue#valueType() valueType()} of {@link ConfigValueType#NULL NULL} exist in a {@code ConfigObject}, while a {@code Config} treats null values as if they were missing.
<p> <strong>Getting configuration values</strong>
<p> The “getters” on a {@code Config} all work in the same way. They never return null, nor do they return a {@code ConfigValue} with {@link ConfigValue#valueType() valueType()} of {@link ConfigValueType#NULL NULL}. Instead, they throw {@link ConfigException.Missing} if the value is completely absent or set to null. If the value is set to null, a subtype of {@code ConfigException.Missing} called {@link ConfigException.Null} will be thrown. {@link ConfigException.WrongType} will be thrown anytime you ask for a type and the value has an incompatible type. Reasonable type conversions are performed for you though.
<p> <strong>Iteration</strong>
<p> If you want to iterate over the contents of a {@code Config}, you
can get its {@code ConfigObject} with {@link root()}, and then iterate over the
{@code ConfigObject} (which implements java.util.Map
). Or, you
can use {@link entrySet()} which recurses the object tree for you and
builds up a Set
of all path-value pairs where the value is not
null.
<p> <strong>Resolving substitutions</strong>
<p> Substitutions are the ${foo.bar}
syntax in
config files, described in the <a href= “github.com/typesafehub/config/blob/master/HOCON.md#substitutions”
>specification</a>. Resolving substitutions replaces these
references with real values.
<p> Before using a {@code Config} it's necessary to call {@link #resolve} to handle substitutions (though {@link ConfigFactory#load()} and similar methods will do the resolve for you already).
<p> <strong>Merging</strong>
<p> The full Config
for your application can be
constructed using the associative operation {@link
Config#withFallback(ConfigMergeable)}. If you use {@link
ConfigFactory#load()} (recommended), it merges system properties over the
top of application.conf
over the top of
reference.conf
, using withFallback
. You can add
in additional sources of configuration in the same way (usually, custom
layers should go either just above or just below
application.conf
, keeping reference.conf
at the
bottom and system properties at the top).
<p> <strong>Serialization</strong>
<p> Convert a Config
to a JSON or HOCON string by
calling {@link ConfigObject#render()} on the root object,
myConfig.root().render()
. There's also a variant {@link
ConfigObject#render(ConfigRenderOptions)} which allows you to control the
format of the rendered string. (See {@link ConfigRenderOptions}.) Note that
Config
does not remember the formatting of the original file,
so if you load, modify, and re-save a config file, it will be substantially
reformatted.
<p> As an alternative to {@link ConfigObject#render()}, the
toString()
method produces a debug-output-oriented
representation (which is not valid JSON).
<p> Java serialization is supported as well for Config
and all subtypes of ConfigValue
.
<p> <strong>This is an interface but don't implement it yourself</strong>
<p> Do not implement {@code Config}; it should only be implemented by the config library. Arbitrary implementations will not work because the library internals assume a specific concrete implementation. Also, this interface is likely to grow new methods over time, so third-party implementations will break.
Public Instance Methods
Places the config inside a {@code Config} at the given key. See also atPath(). Note that a key is NOT a path expression (see {@link ConfigUtil#joinPath} and {@link ConfigUtil#splitPath}).
@param key
key to store this config at.
@return a {@code Config} instance containing this config at the given
key.
# File lib/hocon/config.rb, line 987 def at_key(key) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `at_key` (#{self.class})" end
Places the config inside another {@code Config} at the given path. <p> Note that path expressions have a syntax and sometimes require quoting (see {@link ConfigUtil#joinPath} and {@link ConfigUtil#splitPath}).
@param path
path expression to store this config at.
@return a {@code Config} instance containing this config at the given
path.
# File lib/hocon/config.rb, line 973 def at_path(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `at_path` (#{self.class})" end
Validates this config against a reference config, throwing an exception if it is invalid. The purpose of this method is to “fail early” with a comprehensive list of problems; in general, anything this method can find would be detected later when trying to use the config, but it's often more user-friendly to fail right away when loading the config.
<p> Using this method is always optional, since you can “fail late” instead.
<p> You must restrict validation to paths you “own” (those whose meaning are defined by your code module). If you validate globally, you may trigger errors about paths that happen to be in the config but have nothing to do with your module. It's best to allow the modules owning those paths to validate them. Also, if every module validates only its own stuff, there isn't as much redundant work being done.
<p> If no paths are specified in checkValid()
's
parameter list, validation is for the entire config.
<p> If you specify paths that are not in the reference config, those paths are ignored. (There's nothing to validate.)
<p> Here's what validation involves:
<ul> <li>All paths found in the reference config must be present in this config or an exception will be thrown. <li> Some changes in type from the reference config to this config will cause an exception to be thrown. Not all potential type problems are detected, in particular it's assumed that strings are compatible with everything except objects and lists. This is because string types are often “really” some other type (system properties always start out as strings, or a string like “5ms” could be used with {@link getMilliseconds}). Also, it's allowed to set any type to null or override null with any type. <li> Any unresolved substitutions in this config will cause a validation failure; both the reference config and this config should be resolved before validation. If the reference config is unresolved, it's a bug in the caller of this method. </ul>
<p> If you want to allow a certain setting to have a flexible type (or otherwise want validation to be looser for some settings), you could either remove the problematic setting from the reference config provided to this method, or you could intercept the validation exception and screen out certain problems. Of course, this will only work if all other callers of this method are careful to restrict validation to their own paths, as they should be.
<p> If validation fails, the thrown exception contains a list of all
problems found. See {@link ConfigException.ValidationFailed#problems}. The
exception's getMessage()
will have all the problems
concatenated into one huge string, as well.
<p> Again, checkValid()
can't guess every
domain-specific way a setting can be invalid, so some problems may arise
later when attempting to use the config. checkValid()
is
limited to reporting generic, but common, problems such as missing settings
and blatant type incompatibilities.
@param reference
a reference configuration
@param restrictToPaths
only validate values underneath these paths that your code module owns and understands
@throws ConfigException.ValidationFailed
if there are any validation issues
@throws ConfigException.NotResolved
if this config is not resolved
@throws ConfigException.BugOrBroken
if the reference config is unresolved or caller otherwise misuses the API
# File lib/hocon/config.rb, line 360 def check_valid(reference, restrict_to_paths) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `check_valid` (#{self.class})" end
Returns true if the {@code Config}'s root object contains no key-value pairs.
@return true if the configuration is empty
# File lib/hocon/config.rb, line 397 def empty? raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `empty` (#{self.class})" end
Returns the set of path-value pairs, excluding any null values, found by
recursing {@link root() the root
object}. Note that this is very different from
root().entrySet()
which returns the set of immediate-child
keys in the root object and includes null values. <p> Entries contain
path expressions meaning there may be quoting and escaping
involved. Parse path expressions with {@link ConfigUtil#splitPath}.
<p> Because a Config
is conceptually a single-level map
from paths to values, there will not be any {@link ConfigObject} values in
the entries (that is, all entries represent leaf nodes). Use {@link
ConfigObject} rather than Config
if you want a tree. (OK, this
is a slight lie: Config
entries may contain {@link ConfigList}
and the lists may contain objects. But no objects are directly included as
entry values.)
@return set of paths with non-null values, built up by recursing the
entire tree of {@link ConfigObject} and creating an entry for each leaf value.
# File lib/hocon/config.rb, line 423 def entry_set raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `entry_set` (#{self.class})" end
Gets the value at the path as an unwrapped Java boxed value ( {@link java.lang.Boolean Boolean}, {@link java.lang.Integer Integer}, and so on - see {@link ConfigValue#unwrapped()}).
@param path
path expression
@return the unwrapped value at the requested path @throws ConfigException.Missing
if value is absent or null
# File lib/hocon/config.rb, line 557 def get_any_ref(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_any_ref` (#{self.class})" end
Gets a list value with any kind of elements. Throws if the path is unset or null or not a list. Each element is “unwrapped” (see {@link ConfigValue#unwrapped()}).
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list
# File lib/hocon/config.rb, line 862 def get_any_ref_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_any_ref_list`path(#{self.class})" end
@param path
path expression
@return the boolean value at the requested path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to boolean
# File lib/hocon/config.rb, line 437 def get_boolean(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_boolean` (#{self.class})" end
Gets a list value with boolean elements. Throws if the path is unset or null or not a list or contains values not convertible to boolean.
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of booleans
# File lib/hocon/config.rb, line 726 def get_boolean_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_boolean_list` (#{self.class})" end
Gets a value as a size in bytes (parses special strings like “128M”). If the value is already a number, then it's left alone; if it's a string, it's parsed understanding unit suffixes such as “128K”, as documented in the <a href=“the”>github.com/typesafehub/config/blob/master/HOCON.md“>the spec</a>.
@param path
path expression
@return the value at the requested path, in bytes @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to Long or String
@throws ConfigException.BadValue
if value cannot be parsed as a size in bytes
# File lib/hocon/config.rb, line 596 def get_bytes(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_bytes` (#{self.class})" end
Gets a list value with elements representing a size in bytes. Throws if the path is unset or null or not a list or contains values not convertible to memory sizes.
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of memory sizes
# File lib/hocon/config.rb, line 879 def get_bytes_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_bytes_list` (#{self.class})" end
@param path
path expression
@return the nested {@code Config} value at the requested path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a Config
# File lib/hocon/config.rb, line 542 def get_config(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_config` (#{self.class})" end
Gets a list value with Config
elements. Throws if the path is
unset or null or not a list or contains values not convertible to
Config
.
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of configs
# File lib/hocon/config.rb, line 845 def get_config_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_config_list` (#{self.class})" end
@param path
path expression
@return the floating-point value at the requested path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a double
# File lib/hocon/config.rb, line 503 def get_double(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_double` (#{self.class})" end
Gets a list value with double elements. Throws if the path is unset or null or not a list or contains values not convertible to double.
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of doubles
# File lib/hocon/config.rb, line 794 def get_double_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_double_list` (#{self.class})" end
Gets a value as a duration in a specified {@link java.util.concurrent.TimeUnit TimeUnit}. If the value is already a number, then it's taken as milliseconds and then converted to the requested TimeUnit; if it's a string, it's parsed understanding units suffixes like “10m” or “5ns” as documented in the <a href=“the”>github.com/typesafehub/config/blob/master/HOCON.md“>the spec</a>.
@since 1.2.0
@param path
path expression
@param unit
convert the return value to this time unit
@return the duration value at the requested path, in the given TimeUnit @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to Long or String
@throws ConfigException.BadValue
if value cannot be parsed as a number of the given TimeUnit
# File lib/hocon/config.rb, line 692 def get_duration(path, unit) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_duration` (#{self.class})" end
Gets a list, converting each value in the list to a duration, using the same rules as {@link getDuration(String, TimeUnit)}.
@since 1.2.0 @param path
a path expression
@param unit
time units of the returned values
@return list of durations, in the requested units
# File lib/hocon/config.rb, line 929 def get_duration_list(path, unit) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_duration_list` (#{self.class})" end
Gets the integer at the given path. If the value at the path has a fractional (floating point) component, it will be discarded and only the integer part will be returned (it works like a “narrowing primitive conversion” in the Java language specification).
@param path
path expression
@return the 32-bit integer value at the requested path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to an int (for example it is out of range, or it's a boolean value)
# File lib/hocon/config.rb, line 470 def get_int(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_int` (#{self.class})" end
Gets a list value with int elements. Throws if the path is unset or null or not a list or contains values not convertible to int.
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of ints
# File lib/hocon/config.rb, line 760 def get_int_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_int_list` (#{self.class})" end
Gets a list value (with any element type) as a {@link ConfigList}, which implements {@code java.util.List<ConfigValue>}. Throws if the path is unset or null.
@param path
the path to the list value.
@return the {@link ConfigList} at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a ConfigList
# File lib/hocon/config.rb, line 709 def get_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_list` (#{self.class})" end
Gets the long integer at the given path. If the value at the path has a fractional (floating point) component, it will be discarded and only the integer part will be returned (it works like a “narrowing primitive conversion” in the Java language specification).
@param path
path expression
@return the 64-bit long value at the requested path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a long
# File lib/hocon/config.rb, line 490 def get_long(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_long` (#{self.class})" end
Gets a list value with long elements. Throws if the path is unset or null or not a list or contains values not convertible to long.
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of longs
# File lib/hocon/config.rb, line 777 def get_long_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_long_list` (#{self.class})" end
Gets a value as an amount of memory (parses special strings like “128M”). If the value is already a number, then it's left alone; if it's a string, it's parsed understanding unit suffixes such as “128K”, as documented in the <a href=“the”>github.com/typesafehub/config/blob/master/HOCON.md“>the spec</a>.
@since 1.3.0
@param path
path expression
@return the value at the requested path, in bytes @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to Long or String
@throws ConfigException.BadValue
if value cannot be parsed as a size in bytes
# File lib/hocon/config.rb, line 620 def get_memory_size(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_memory_size`path(#{self.class})" end
Gets a list, converting each value in the list to a memory size, using the same rules as {@link getMemorySize(String)}.
@since 1.3.0 @param path
a path expression
@return list of memory sizes @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of memory sizes
# File lib/hocon/config.rb, line 896 def get_memory_size_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_memory_size_list` (#{self.class})" end
Get value as a duration in milliseconds. If the value is already a number, then it's left alone; if it's a string, it's parsed understanding units suffixes like “10m” or “5ns” as documented in the <a href=“the”>github.com/typesafehub/config/blob/master/HOCON.md“>the spec</a>.
@deprecated As of release 1.1, replaced by {@link getDuration(String, TimeUnit)}
@param path
path expression
@return the duration value at the requested path, in milliseconds @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to Long or String
@throws ConfigException.BadValue
if value cannot be parsed as a number of milliseconds
# File lib/hocon/config.rb, line 643 def get_milliseconds(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_milliseconds` (#{self.class})" end
@deprecated As of release 1.1, replaced by {@link getDurationList(String, TimeUnit)} @param path the path @return list of millisecond values
# File lib/hocon/config.rb, line 905 def get_milliseconds_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_milliseconds_list` (#{self.class})" end
Get value as a duration in nanoseconds. If the value is already a number it's taken as milliseconds and converted to nanoseconds. If it's a string, it's parsed understanding unit suffixes, as for {@link getDuration(String, TimeUnit)}.
@deprecated As of release 1.1, replaced by {@link getDuration(String, TimeUnit)}
@param path
path expression
@return the duration value at the requested path, in nanoseconds @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to Long or String
@throws ConfigException.BadValue
if value cannot be parsed as a number of nanoseconds
# File lib/hocon/config.rb, line 665 def get_nanoseconds(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_nanoseconds` (#{self.class})" end
@deprecated As of release 1.1, replaced by {@link getDurationList(String, TimeUnit)} @param path the path @return list of nanosecond values
# File lib/hocon/config.rb, line 914 def get_nanoseconds_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_nanoseconds_list` (#{self.class})" end
@param path
path expression
@return the numeric value at the requested path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a number
# File lib/hocon/config.rb, line 450 def get_number(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_number` (#{self.class})" end
Gets a list value with number elements. Throws if the path is unset or null or not a list or contains values not convertible to number.
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of numbers
# File lib/hocon/config.rb, line 743 def get_number_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_number_list` (#{self.class})" end
@param path
path expression
@return the {@link ConfigObject} value at the requested path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to an object
# File lib/hocon/config.rb, line 529 def get_object(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_object` (#{self.class})" end
Gets a list value with object elements. Throws if the path is unset or
null or not a list or contains values not convertible to
ConfigObject
.
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of objects
# File lib/hocon/config.rb, line 828 def get_object_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_object_list` (#{self.class})" end
@param path
path expression
@return the string value at the requested path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a string
# File lib/hocon/config.rb, line 516 def get_string(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_string` (#{self.class})" end
Gets a list value with string elements. Throws if the path is unset or null or not a list or contains values not convertible to string.
@param path
the path to the list value.
@return the list at the path @throws ConfigException.Missing
if value is absent or null
@throws ConfigException.WrongType
if value is not convertible to a list of strings
# File lib/hocon/config.rb, line 811 def get_string_list(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_string_list` (#{self.class})" end
Gets the value at the given path, unless the value is a null value or missing, in which case it throws just like the other getters. Use {@code get()} on the {@link #root} object (or other object in the tree) if you want an unprocessed value.
@param path
path expression
@return the value at the requested path @throws ConfigException.Missing
if value is absent or null
# File lib/hocon/config.rb, line 574 def get_value(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `get_value`path(#{self.class})" end
Checks whether a value is present and non-null at the given path. This differs in two ways from {@code Map.containsKey()} as implemented by {@link ConfigObject}: it looks for a path expression, not a key; and it returns false for null values, while {@code containsKey()} returns true indicating that the object contains a null value for the key.
<p> If a path exists according to {@link hasPath(String)}, then {@link getValue(String)} will never throw an exception. However, the typed getters, such as {@link getInt(String)}, will still throw if the value is not convertible to the requested type.
<p> Note that path expressions have a syntax and sometimes require quoting (see {@link ConfigUtil#joinPath} and {@link ConfigUtil#splitPath}).
@param path
the path expression
@return true if a non-null value is present at the path @throws ConfigException.BadPath
if the path expression is invalid
# File lib/hocon/config.rb, line 387 def has_path(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `has_path` (#{self.class})" end
Gets the origin of the {@code Config}, which may be a file, or a file with a line number, or just a descriptive phrase.
@return the origin of the {@code Config} for use in error messages
# File lib/hocon/config.rb, line 178 def origin raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `origin` (#{self.class})" end
Returns a replacement config with all substitutions (the
${foo.bar}
syntax, see <a href=“the”>github.com/typesafehub/config/blob/master/HOCON.md“>the
spec</a>) resolved. Substitutions are looked up using this
Config
as the root object, that is, a substitution
${foo.bar}
will be replaced with the result of
getValue("foo.bar")
.
<p> This method uses {@link ConfigResolveOptions#defaults()}, there is another variant {@link #resolve} which lets you specify non-default options.
<p> A given {@link Config} must be resolved before using it to retrieve config values, but ideally should be resolved one time for your entire stack of fallbacks (see {@link Config#withFallback}). Otherwise, some substitutions that could have resolved with all fallbacks available may not resolve, which will be potentially confusing for your application's users.
<p> resolve()
should be invoked on root config objects,
rather than on a subtree (a subtree is the result of something like
config.getConfig("foo")
). The problem with
resolve()
on a subtree is that substitutions are relative to
the root of the config and the subtree will have no way to get values from
the root. For example, if you did
config.getConfig("foo").resolve()
on the below
config file, it would not work:
<pre>
common-value = 10 foo { whatever = ${common-value} }
</pre>
<p> Many methods on {@link ConfigFactory} such as {@link
ConfigFactory#load()} automatically resolve the loaded Config
on the loaded stack of config files.
<p> Resolving an already-resolved config is a harmless no-op, but again, it is best to resolve an entire stack of fallbacks (such as all your config files combined) rather than resolving each one individually.
@return an immutable object with substitutions resolved @throws ConfigException.UnresolvedSubstitution
if any substitutions refer to nonexistent paths
@throws ConfigException
some other config exception if there are other problems
# File lib/hocon/config.rb, line 241 def resolve(options) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `resolve` (#{self.class})" end
Like {@link Config#resolveWith(Config)} but allows you to specify non-default options.
@param source
source configuration to pull values from
@param options
resolve options
@return the resolved Config
(may be only partially resolved
if options are set to allow unresolved)
@since 1.2.0
# File lib/hocon/config.rb, line 274 def resolve_with(source, options) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `resolve_with` (#{self.class})" end
Checks whether the config is completely resolved. After a successful call
to {@link #resolve} it will be
completely resolved, but after calling {@link #resolve} with
allowUnresolved
set in the options, it may or may not be
completely resolved. A newly-loaded config may or may not be completely
resolved depending on whether there were substitutions present in the file.
@return true if there are no unresolved substitutions remaining in this
configuration.
@since 1.2.0
# File lib/hocon/config.rb, line 258 def resolved? raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `resolved?` (#{self.class})" end
Gets the {@code Config} as a tree of {@link ConfigObject}. This is a constant-time operation (it is not proportional to the number of values in the {@code Config}).
@return the root object in the configuration
# File lib/hocon/config.rb, line 168 def root raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `root` (#{self.class})" end
# File lib/hocon/config.rb, line 182 def with_fallback(other) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `with_fallback` (#{self.class})" end
Clone the config with only the given path (and its children) retained; all sibling paths are removed. <p> Note that path expressions have a syntax and sometimes require quoting (see {@link ConfigUtil#joinPath} and {@link ConfigUtil#splitPath}).
@param path
path to keep
@return a copy of the config minus all paths except the one specified
# File lib/hocon/config.rb, line 944 def with_only_path(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `with_only_path` (#{self.class})" end
Returns a {@code Config} based on this one, but with the given path set to the given value. Does not modify this instance (since it's immutable). If the path already has a value, that value is replaced. To remove a value, use withoutPath(). <p> Note that path expressions have a syntax and sometimes require quoting (see {@link ConfigUtil#joinPath} and {@link ConfigUtil#splitPath}).
@param path
path expression for the value's new location
@param value
value at the new path
@return the new instance with the new map entry
# File lib/hocon/config.rb, line 1006 def with_value(path, value) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `with_value` (#{self.class})" end
Clone the config with the given path removed. <p> Note that path expressions have a syntax and sometimes require quoting (see {@link ConfigUtil#joinPath} and {@link ConfigUtil#splitPath}).
@param path
path expression to remove
@return a copy of the config minus the specified path
# File lib/hocon/config.rb, line 958 def without_path(path) raise Hocon::ConfigError::ConfigBugOrBrokenError, "subclasses of `Config` must implement `without_path` (#{self.class})" end