org.apache.flink.configuration

Class Configuration

java.lang.Object

org.apache.flink.configuration.Configuration

All Implemented Interfaces:

Serializable, IOReadableWritable

public class Configuration
extends Object
implements IOReadableWritable, Serializable

Lightweight configuration object which can store key/value pairs.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Configuration()

Method Summary

Methods

Modifier and Type	Method and Description
void	addAll(Configuration other)
void	addAll(Configuration other, String prefix) Adds all entries from the given configuration into this configuration.
boolean	containsKey(String key) Checks whether there is an entry with the specified key
boolean	equals(Object obj)
boolean	getBoolean(String key, boolean defaultValue) Returns the value associated with the given key as a boolean.
byte[]	getBytes(String key, byte[] defaultValue) Returns the value associated with the given key as a byte array.
<T> Class<T>	getClass(String key, Class<? extends T> defaultValue, ClassLoader classLoader) Returns the class associated with the given key as a string.
double	getDouble(String key, double defaultValue) Returns the value associated with the given key as a double.
float	getFloat(String key, float defaultValue) Returns the value associated with the given key as a float.
int	getInteger(String key, int defaultValue) Returns the value associated with the given key as an integer.
long	getLong(String key, long defaultValue) Returns the value associated with the given key as a long.
String	getString(String key, String defaultValue) Returns the value associated with the given key as a string.
int	hashCode()
Set<String>	keySet() Returns the keys of all key/value pairs stored inside this configuration object.
void	read(DataInputView in) Reads the object's internal data from the given data input view.
void	setBoolean(String key, boolean value) Adds the given key/value pair to the configuration object.
void	setBytes(String key, byte[] bytes) Adds the given byte array to the configuration object.
void	setClass(String key, Class<?> klazz) Adds the given key/value pair to the configuration object.
void	setDouble(String key, double value) Adds the given key/value pair to the configuration object.
void	setFloat(String key, float value) Adds the given key/value pair to the configuration object.
void	setInteger(String key, int value) Adds the given key/value pair to the configuration object.
void	setLong(String key, long value) Adds the given key/value pair to the configuration object.
void	setString(String key, String value) Adds the given key/value pair to the configuration object.
String	toString()
void	write(DataOutputView out) Writes the object's internal data to the given data output view.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Configuration

public Configuration()

Method Detail

getClass

public <T> Class<T> getClass(String key,
                    Class<? extends T> defaultValue,
                    ClassLoader classLoader)
                  throws ClassNotFoundException

Returns the class associated with the given key as a string.

Type Parameters:

T - The type of the class to return.

Parameters:

key - The key pointing to the associated value

defaultValue - The optional default value returned if no entry exists

classLoader - The class loader used to resolve the class.

Returns:

The value associated with the given key, or the default value, if to entry for the key exists.

Throws:

ClassNotFoundException

setClass

public void setClass(String key,
            Class<?> klazz)

Adds the given key/value pair to the configuration object. The class can be retrieved by invoking getClass(String, Class, ClassLoader) if it is in the scope of the class loader on the caller.

Parameters:

key - The key of the pair to be added

klazz - The value of the pair to be added

See Also:

getClass(String, Class, ClassLoader)

getString

public String getString(String key,
               String defaultValue)

Returns the value associated with the given key as a string.

Parameters:

key - the key pointing to the associated value

defaultValue - the default value which is returned in case there is no value associated with the given key

Returns:

the (default) value associated with the given key

setString

public void setString(String key,
             String value)

Adds the given key/value pair to the configuration object.

Parameters:

key - the key of the key/value pair to be added

value - the value of the key/value pair to be added

getInteger

public int getInteger(String key,
             int defaultValue)

Returns the value associated with the given key as an integer.

Parameters:

key - the key pointing to the associated value

defaultValue - the default value which is returned in case there is no value associated with the given key

Returns:

the (default) value associated with the given key

setInteger

public void setInteger(String key,
              int value)

Adds the given key/value pair to the configuration object.

Parameters:

key - the key of the key/value pair to be added

value - the value of the key/value pair to be added

getLong

public long getLong(String key,
           long defaultValue)

Returns the value associated with the given key as a long.

Parameters:

key - the key pointing to the associated value

defaultValue - the default value which is returned in case there is no value associated with the given key

Returns:

the (default) value associated with the given key

setLong

public void setLong(String key,
           long value)

Adds the given key/value pair to the configuration object.

Parameters:

key - the key of the key/value pair to be added

value - the value of the key/value pair to be added

getBoolean

public boolean getBoolean(String key,
                 boolean defaultValue)

Returns the value associated with the given key as a boolean.

Parameters:

key - the key pointing to the associated value

defaultValue - the default value which is returned in case there is no value associated with the given key

Returns:

the (default) value associated with the given key

setBoolean

public void setBoolean(String key,
              boolean value)

Adds the given key/value pair to the configuration object.

Parameters:

key - the key of the key/value pair to be added

value - the value of the key/value pair to be added

getFloat

public float getFloat(String key,
             float defaultValue)

Returns the value associated with the given key as a float.

Parameters:

key - the key pointing to the associated value

defaultValue - the default value which is returned in case there is no value associated with the given key

Returns:

the (default) value associated with the given key

setFloat

public void setFloat(String key,
            float value)

Adds the given key/value pair to the configuration object.

Parameters:

key - the key of the key/value pair to be added

value - the value of the key/value pair to be added

getDouble

public double getDouble(String key,
               double defaultValue)

Returns the value associated with the given key as a double.

Parameters:

key - the key pointing to the associated value

defaultValue - the default value which is returned in case there is no value associated with the given key

Returns:

the (default) value associated with the given key

setDouble

public void setDouble(String key,
             double value)

Adds the given key/value pair to the configuration object.

Parameters:

key - the key of the key/value pair to be added

value - the value of the key/value pair to be added

getBytes

public byte[] getBytes(String key,
              byte[] defaultValue)

Returns the value associated with the given key as a byte array.

Parameters:

key - The key pointing to the associated value.

defaultValue - The default value which is returned in case there is no value associated with the given key.

Returns:

the (default) value associated with the given key.

setBytes

public void setBytes(String key,
            byte[] bytes)

Adds the given byte array to the configuration object. If key is null then nothing is added.

Parameters:

key - The key under which the bytes are added.

bytes - The bytes to be added.

keySet

public Set<String> keySet()

Returns the keys of all key/value pairs stored inside this configuration object.

Returns:

the keys of all key/value pairs stored inside this configuration object

addAll

public void addAll(Configuration other)

addAll

public void addAll(Configuration other,
          String prefix)

Adds all entries from the given configuration into this configuration. The keys are prepended with the given prefix.

Parameters:

other - The configuration whose entries are added to this configuration.

prefix - The prefix to prepend.

containsKey

public boolean containsKey(String key)

Checks whether there is an entry with the specified key

Parameters:

key - key of entry

Returns:

true if the key is stored, false otherwise

read

public void read(DataInputView in)
          throws IOException

Description copied from interface: IOReadableWritable

Reads the object's internal data from the given data input view.

Specified by:

read in interface IOReadableWritable

Parameters:

in - the input view to read the data from

Throws:

IOException - thrown if any error occurs while reading from the input stream

write

public void write(DataOutputView out)
           throws IOException

Description copied from interface: IOReadableWritable

Writes the object's internal data to the given data output view.

Specified by:

write in interface IOReadableWritable

Parameters:

out - the output view to receive the data.

Throws:

IOException - thrown if any error occurs while writing to the output stream

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object