UnitDatabase

java.lang.Object
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- org.unitConverter.unit.UnitDatabase
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```
public final class UnitDatabase
-extends java.lang.Object
```
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A database of units, prefixes and dimensions, and their names.
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Since:
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2019-01-07, v0.1.0
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Author:
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Adrien Hopkins
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Constructor Summary
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Constructors
Constructor and Description
UnitDatabase() -
Creates the UnitsDatabase.
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Constructors
Constructor and Description
`UnitDatabase()` - Creates the `UnitsDatabase`. -

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Method Summary

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All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addDimension(java.lang.String name, - ObjectProduct<BaseDimension> dimension)` - Adds a unit dimension to the database. -
`void`	`addPrefix(java.lang.String name, - UnitPrefix prefix)` - Adds a unit prefix to the database. -
`void`	`addUnit(java.lang.String name, - Unit unit)` - Adds a unit to the database. -
`boolean`	`containsDimensionName(java.lang.String name)` - Tests if the database has a unit dimension with this name. -
`boolean`	`containsPrefixName(java.lang.String name)` - Tests if the database has a unit prefix with this name. -
`boolean`	`containsUnitName(java.lang.String name)` - Tests if the database has a unit with this name, taking prefixes into consideration -
`java.util.Map<java.lang.String,ObjectProduct<BaseDimension>>`	`dimensionMap()`
`ObjectProduct<BaseDimension>`	`getDimension(java.lang.String name)` - Gets a unit dimension from the database using its name. -
`ObjectProduct<BaseDimension>`	`getDimensionFromExpression(java.lang.String expression)` - Uses the database's data to parse an expression into a unit dimension -
`UnitPrefix`	`getPrefix(java.lang.String name)` - Gets a unit prefix from the database from its name -
`UnitPrefix`	`getPrefixFromExpression(java.lang.String expression)` - Gets a unit prefix from a prefix expression -
`Unit`	`getUnit(java.lang.String name)` - Gets a unit from the database from its name, looking for prefixes. -
`Unit`	`getUnitFromExpression(java.lang.String expression)` - Uses the database's unit data to parse an expression into a unit -
`void`	`loadDimensionFile(java.io.File file)` - Adds all dimensions from a file, using data from the database to parse them. -
`void`	`loadUnitsFile(java.io.File file)` - Adds all units from a file, using data from the database to parse them. -
`java.util.Map<java.lang.String,UnitPrefix>`	`prefixMap()`
`java.lang.String`	`toString()`
`java.util.Map<java.lang.String,Unit>`	`unitMap()` - Returns a map mapping unit names to units, including units with prefixes. -
`java.util.Map<java.lang.String,Unit>`	`unitMapPrefixless()`

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Methods inherited from class java.lang.Object
-clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

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  Constructor Detail
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    UnitDatabase
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```
public UnitDatabase()
```
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    Creates the UnitsDatabase.
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    Since:
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    2019-01-10, v0.1.0
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  Method Detail
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    addDimension
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```
public void addDimension(java.lang.String name,
-                         ObjectProduct<BaseDimension> dimension)
```
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    Adds a unit dimension to the database.
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    Parameters:
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    name - dimension's name
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    dimension - dimension to add
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    Throws:
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    java.lang.NullPointerException - if name or dimension is null
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    Since:
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    2019-03-14, v0.2.0
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    addPrefix
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```
public void addPrefix(java.lang.String name,
-                      UnitPrefix prefix)
```
    -
    Adds a unit prefix to the database.
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    Parameters:
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    name - prefix's name
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    prefix - prefix to add
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    Throws:
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    java.lang.NullPointerException - if name or prefix is null
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    Since:
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    2019-01-14, v0.1.0
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    addUnit
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```
public void addUnit(java.lang.String name,
-                    Unit unit)
```
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    Adds a unit to the database.
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    Parameters:
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    name - unit's name
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    unit - unit to add
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    Throws:
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    java.lang.NullPointerException - if unit is null
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    Since:
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    2019-01-10, v0.1.0
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    containsDimensionName
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```
public boolean containsDimensionName(java.lang.String name)
```
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    Tests if the database has a unit dimension with this name.
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    Parameters:
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    name - name to test
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    Returns:
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    if database contains name
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    Since:
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    2019-03-14, v0.2.0
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    containsPrefixName
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```
public boolean containsPrefixName(java.lang.String name)
```
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    Tests if the database has a unit prefix with this name.
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    Parameters:
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    name - name to test
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    Returns:
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    if database contains name
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    Since:
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    2019-01-13, v0.1.0
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    containsUnitName
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```
public boolean containsUnitName(java.lang.String name)
```
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    Tests if the database has a unit with this name, taking prefixes into consideration
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    Parameters:
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    name - name to test
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    Returns:
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    if database contains name
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    Since:
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    2019-01-13, v0.1.0
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    dimensionMap
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```
public java.util.Map<java.lang.String,ObjectProduct<BaseDimension>> dimensionMap()
```
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    Returns:
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    a map mapping dimension names to dimensions
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    Since:
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    2019-04-13, v0.2.0
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    getDimension
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```
public ObjectProduct<BaseDimension> getDimension(java.lang.String name)
```
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    Gets a unit dimension from the database using its name. - -
    - This method accepts exponents, like "L^3" -
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    Parameters:
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    name - dimension's name
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    Returns:
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    dimension
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    Since:
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    2019-03-14, v0.2.0
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    getDimensionFromExpression
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```
public ObjectProduct<BaseDimension> getDimensionFromExpression(java.lang.String expression)
```
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    Uses the database's data to parse an expression into a unit dimension -
    - The expression is a series of any of the following: -
    - The name of a unit dimension, which multiplies or divides the result based on preceding operators
    - The operators '*' and '/', which multiply and divide (note that just putting two unit dimensions next to each - other is equivalent to multiplication)
    - The operator '^' which exponentiates. Exponents must be integers.
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    Parameters:
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    expression - expression to parse
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    Throws:
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    java.lang.IllegalArgumentException - if the expression cannot be parsed
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    java.lang.NullPointerException - if expression is null
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    Since:
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    2019-04-13, v0.2.0
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    getPrefix
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```
public UnitPrefix getPrefix(java.lang.String name)
```
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    Gets a unit prefix from the database from its name
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    Parameters:
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    name - prefix's name
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    Returns:
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    prefix
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    Since:
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    2019-01-10, v0.1.0
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    getPrefixFromExpression
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```
public UnitPrefix getPrefixFromExpression(java.lang.String expression)
```
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    Gets a unit prefix from a prefix expression -
    - Currently, prefix expressions are much simpler than unit expressions: They are either a number or the name of - another prefix -
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    Parameters:
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    expression - expression to input
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    Returns:
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    prefix
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    Throws:
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    java.lang.IllegalArgumentException - if expression cannot be parsed
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    java.lang.NullPointerException - if any argument is null
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    Since:
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    2019-01-14, v0.1.0
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    getUnit
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```
public Unit getUnit(java.lang.String name)
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    Gets a unit from the database from its name, looking for prefixes.
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    Parameters:
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    name - unit's name
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    Returns:
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    unit
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    Since:
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    2019-01-10, v0.1.0
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    getUnitFromExpression
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```
public Unit getUnitFromExpression(java.lang.String expression)
```
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    Uses the database's unit data to parse an expression into a unit -
    - The expression is a series of any of the following: -
    - The name of a unit, which multiplies or divides the result based on preceding operators
    - The operators '*' and '/', which multiply and divide (note that just putting two units or values next to each - other is equivalent to multiplication)
    - The operator '^' which exponentiates. Exponents must be integers.
    - A number which is multiplied or divided
    - This method only works with linear units.
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    Parameters:
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    expression - expression to parse
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    Throws:
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    java.lang.IllegalArgumentException - if the expression cannot be parsed
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    java.lang.NullPointerException - if expression is null
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    Since:
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    2019-01-07, v0.1.0
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    loadDimensionFile
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```
public void loadDimensionFile(java.io.File file)
```
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    Adds all dimensions from a file, using data from the database to parse them. -
    - Each line in the file should consist of a name and an expression (parsed by getDimensionFromExpression) separated - by any number of tab characters. -
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    - Allowed exceptions: -
    - Anything after a '#' character is considered a comment and ignored.
    - Blank lines are also ignored
    - If an expression consists of a single exclamation point, instead of parsing it, this method will search the - database for an existing unit. If no unit is found, an IllegalArgumentException is thrown. This is used to define - initial units and ensure that the database contains them.
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    Parameters:
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    file - file to read
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    Throws:
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    java.lang.IllegalArgumentException - if the file cannot be parsed, found or read
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    java.lang.NullPointerException - if file is null
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    Since:
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    2019-01-13, v0.1.0
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    loadUnitsFile
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```
public void loadUnitsFile(java.io.File file)
```
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    Adds all units from a file, using data from the database to parse them. -
    - Each line in the file should consist of a name and an expression (parsed by getUnitFromExpression) separated by - any number of tab characters. -
    -
    - Allowed exceptions: -
    - Anything after a '#' character is considered a comment and ignored.
    - Blank lines are also ignored
    - If an expression consists of a single exclamation point, instead of parsing it, this method will search the - database for an existing unit. If no unit is found, an IllegalArgumentException is thrown. This is used to define - initial units and ensure that the database contains them.
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    Parameters:
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    file - file to read
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    Throws:
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    java.lang.IllegalArgumentException - if the file cannot be parsed, found or read
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    java.lang.NullPointerException - if file is null
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    Since:
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    2019-01-13, v0.1.0
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    prefixMap
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```
public java.util.Map<java.lang.String,UnitPrefix> prefixMap()
```
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    Returns:
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    a map mapping prefix names to prefixes
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    Since:
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    2019-04-13, v0.2.0
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    toString
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```
public java.lang.String toString()
```
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    Overrides:
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    toString in class java.lang.Object
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    Returns:
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    a string stating the number of units, prefixes and dimensions in the database
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    unitMap
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```
public java.util.Map<java.lang.String,Unit> unitMap()
```
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    Returns a map mapping unit names to units, including units with prefixes. -
    - The returned map is infinite in size if there is at least one unit and at least one prefix. If it is infinite, - some operations that only work with finite collections, like converting name/entry sets to arrays, will throw an - IllegalStateException. -
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    - Specifically, the operations that will throw an IllegalStateException if the map is infinite in size are: -
    - unitMap.entrySet().toArray() (either overloading)
    - unitMap.keySet().toArray() (either overloading)
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    - Because of ambiguities between prefixes (i.e. kilokilo = mega), the map's containsValue and values() methods currently ignore prefixes. -
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    Returns:
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    a map mapping unit names to units, including prefixed names
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    Since:
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    2019-04-13, v0.2.0
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    unitMapPrefixless
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```
public java.util.Map<java.lang.String,Unit> unitMapPrefixless()
```
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    Returns:
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    a map mapping unit names to units, ignoring prefixes
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    Since:
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    2019-04-13, v0.2.0
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Class UnitDatabase

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

UnitDatabase

Method Detail

addDimension

addPrefix

addUnit

containsDimensionName

containsPrefixName

containsUnitName

dimensionMap

getDimension

getDimensionFromExpression

getPrefix

getPrefixFromExpression

getUnit

getUnitFromExpression

loadDimensionFile

loadUnitsFile

prefixMap

toString

unitMap

unitMapPrefixless