com.asakusafw.runtime.io.json

Interface ValueReader

public interface ValueReader

Provides values from data sources.

Since:

0.10.3

Field Summary

Fields

Modifier and Type	Field and Description
static ValueReader	NULL Provides null value.

Method Summary

Modifier and Type	Method and Description
boolean	isNull() Reads the next value and tests whether or not it exists.
boolean	readBoolean() Reads the next value as a boolean.
default BigDecimal	readDecimal() Reads the next value as a decimal.
double	readDouble() Reads the next value as a floating point number value.
default float	readFloat() Reads the next value as a floating point number value.
default int	readInt() Reads the next value as an integer.
long	readLong() Reads the next value as an integer.
default String	readString() Reads the next value as a string.
void	readString(StringBuilder buffer) Reads the next value as a string, and put it into the given buffer.

Field Detail

NULL

static final ValueReader NULL

Provides null value.

See Also:

isNull()

Method Detail

isNull

boolean isNull()
        throws IOException

Reads the next value and tests whether or not it exists.

Returns:

true if it exists, or false otherwise

Throws:

IOException - if I/O error was occurred

readString

void readString(StringBuilder buffer)
         throws IOException

Reads the next value as a string, and put it into the given buffer.

Parameters:

buffer - the destination buffer

Throws:

IOException - if I/O error was occurred

IllegalStateException - if the next value is invalid

See Also:

isNull()

readString

default String readString()
                   throws IOException

Reads the next value as a string.

Returns:

the read value, never null

Throws:

IOException - if I/O error was occurred

See Also:

isNull()

readDecimal

default BigDecimal readDecimal()
                        throws IOException

Reads the next value as a decimal.

Returns:

the read value, never null

Throws:

IOException - if I/O error was occurred

IllegalStateException - if the next value is invalid

NumberFormatException - if the next value is invalid

ArithmeticException - if the next value is invalid

See Also:

isNull()

readInt

default int readInt()
             throws IOException

Reads the next value as an integer.

Returns:

the read value

Throws:

IOException - if I/O error was occurred

IllegalStateException - if the next value is invalid

NumberFormatException - if the next value is invalid

ArithmeticException - if the next value is invalid

See Also:

isNull()

readLong

long readLong()
       throws IOException

Reads the next value as an integer.

Returns:

the read value

Throws:

IOException - if I/O error was occurred

IllegalStateException - if the next value is invalid

NumberFormatException - if the next value is invalid

ArithmeticException - if the next value is invalid

See Also:

isNull()

readFloat

default float readFloat()
                 throws IOException

Reads the next value as a floating point number value.

Returns:

the read value

Throws:

IOException - if I/O error was occurred

IllegalStateException - if the next value is invalid

NumberFormatException - if the next value is invalid

ArithmeticException - if the next value is invalid

See Also:

isNull()

readDouble

double readDouble()
           throws IOException

Reads the next value as a floating point number value.

Returns:

the read value

Throws:

IOException - if I/O error was occurred

IllegalStateException - if the next value is invalid

NumberFormatException - if the next value is invalid

ArithmeticException - if the next value is invalid

See Also:

isNull()

readBoolean

boolean readBoolean()
             throws IOException

Reads the next value as a boolean.

Returns:

the read value

Throws:

IOException - if I/O error was occurred

IllegalStateException - if the next value is invalid

See Also:

isNull()