Module com.github.akurilov.commons

Package com.github.akurilov.commons.io.el

Interface ExpressionInput<T>

Type Parameters:

T -

All Superinterfaces:

java.lang.AutoCloseable, java.util.concurrent.Callable<T>, Input<T>, java.util.function.Supplier<T>

All Known Subinterfaces:

SynchronousExpressionInput<T>

All Known Implementing Classes:

ExpressionInputImpl, SynchronousExpressionInputImpl

public interface ExpressionInput<T>
extends java.util.concurrent.Callable<T>, Input<T>

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	ExpressionInput.Builder

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	ASYNC_MARKER
static java.util.regex.Pattern	EXPRESSION_PATTERN
static javax.el.ExpressionFactory	FACTORY
static java.lang.String	INIT_MARKER
static java.lang.String	SELF_REF_ID
static java.lang.String	SYNC_MARKER

Fields inherited from interface com.github.akurilov.commons.io.Input

DELIMITER

Method Summary

Modifier and Type	Method	Description
static ExpressionInput.Builder	builder()
T	call()	Perform the expression evaluation
java.lang.String	expr()
T	get()	Get a value.
int	get(java.util.List<T> buffer, int limit)	Bulk values get.
T	last()
void	reset()	Set the last value to the initial one.
long	skip(long count)	Skip some items.

Methods inherited from interface java.lang.AutoCloseable

close

Field Detail

SELF_REF_ID

static final java.lang.String SELF_REF_ID

See Also:

Constant Field Values

ASYNC_MARKER

static final java.lang.String ASYNC_MARKER

See Also:

Constant Field Values

SYNC_MARKER

static final java.lang.String SYNC_MARKER

See Also:

Constant Field Values

INIT_MARKER

static final java.lang.String INIT_MARKER

See Also:

Constant Field Values

EXPRESSION_PATTERN

static final java.util.regex.Pattern EXPRESSION_PATTERN

FACTORY

static final javax.el.ExpressionFactory FACTORY

Method Detail

call

T call()

Perform the expression evaluation

Specified by:

call in interface java.util.concurrent.Callable<T>

Returns:

the expression evaluation result

last

T last()

Returns:

the result of the last expression evaluation

get

T get()
throws javax.el.PropertyNotFoundException,
      javax.el.ELException

Get a value. A user should invoke call() method by itself to evaluate the expression if the given expression input is not synchronous. The initial value only would be returned otherwise.

Specified by:

get in interface Input<T>

Specified by:

get in interface java.util.function.Supplier<T>

Returns:

next item or null if no items available more

Throws:

javax.el.PropertyNotFoundException

javax.el.ELException

get

int get(java.util.List<T> buffer,
        int limit)
 throws javax.el.PropertyNotFoundException,
        javax.el.ELException

Bulk values get. A user should invoke call() method by itself to evaluate the expression if the given expression input is not synchronous. The initial value only would be returned otherwise.

Specified by:

get in interface Input<T>

Parameters:

buffer - buffer for the values

limit - max count of the values to put into the buffer

Returns:

count of the items have been get and put into the buffer actually

Throws:

javax.el.PropertyNotFoundException

javax.el.ELException

skip

long skip(long count)

Skip some items.

Specified by:

skip in interface Input<T>

Parameters:

count - count of items should be skipped from the input stream

reset

void reset()

Set the last value to the initial one.

Specified by:

reset in interface Input<T>

expr

java.lang.String expr()

Returns:

the expression string

builder

static ExpressionInput.Builder builder()