org.mule.module.db.internal.el

Class AbstractDbFunction

java.lang.Object

org.mule.module.db.internal.el.AbstractDbFunction

All Implemented Interfaces:

ExpressionLanguageFunction

Direct Known Subclasses:

DbCreateArrayFunction, DbCreateStructFunction

public abstract class AbstractDbFunction
extends Object
implements ExpressionLanguageFunction

Provides a base class for DB functions that creates custom DB types.

Field Summary

Fields

Modifier and Type	Field and Description
static String	INVALID_ARGUMENT_NUMBER
static String	INVALID_DB_CONFIG_ARGUMENT
static String	INVALID_STRUCT_VALUES_ARGUMENT
static String	INVALID_TYPE_NAME_ARGUMENT

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractDbFunction(MuleContext muleContext) Creates a new instance for a given context.

Method Summary

Methods

Modifier and Type	Method and Description
Object	call(Object[] params, ExpressionLanguageContext context)
protected abstract Object	createValue(DbConnection connection, String typeName, Object[] values) Creates the structured type value
protected abstract String	getFunctionName()

Methods inherited from class java.lang.Object

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

Field Detail

INVALID_ARGUMENT_NUMBER

public static final String INVALID_ARGUMENT_NUMBER

See Also:

Constant Field Values

INVALID_DB_CONFIG_ARGUMENT

public static final String INVALID_DB_CONFIG_ARGUMENT

See Also:

Constant Field Values

INVALID_TYPE_NAME_ARGUMENT

public static final String INVALID_TYPE_NAME_ARGUMENT

See Also:

Constant Field Values

INVALID_STRUCT_VALUES_ARGUMENT

public static final String INVALID_STRUCT_VALUES_ARGUMENT

See Also:

Constant Field Values

Constructor Detail

AbstractDbFunction

protected AbstractDbFunction(MuleContext muleContext)

Creates a new instance for a given context.

Parameters:

muleContext - context associated to the artifact using the function. Non null.

Method Detail

call

public Object call(Object[] params,
          ExpressionLanguageContext context)

Specified by:

call in interface ExpressionLanguageFunction

createValue

protected abstract Object createValue(DbConnection connection,
                 String typeName,
                 Object[] values)
                               throws SQLException

Creates the structured type value

Parameters:

connection - connection used to create the value.

typeName - name of the user defined type

values - values that conform the estructured type.

Returns:

the structured value created from the provided arguments

Throws:

SQLException - if there is any DB related error when creating the value

getFunctionName

protected abstract String getFunctionName()

Returns:

the name of the function as it appears on MEL expressions