edu.berkeley.cs186.database.table

Class Schema

java.lang.Object

edu.berkeley.cs186.database.table.Schema

public class Schema
extends Object

The Schema of a particular table. Properties: `fields`: an ordered list of column names `fieldTypes`: an ordered list of data types corresponding to the columns `size`: physical size (in bytes) of a record conforming to this schema

Constructor Summary

Constructors

Constructor and Description
Schema(List<String> fields, List<DataBox> fieldTypes)

Method Summary

Methods

Modifier and Type	Method and Description
Record	decode(byte[] input) Takes a byte[] and decodes it into a Record.
byte[]	encode(Record record) Serializes the provided record into a byte[].
boolean	equals(Object other)
int	getEntrySize()
List<String>	getFieldNames()
List<DataBox>	getFieldTypes()
Record	verify(List<DataBox> values) Verifies that a list of DataBoxes corresponds to this schema.

Methods inherited from class java.lang.Object

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

Constructor Detail

Schema

public Schema(List<String> fields,
      List<DataBox> fieldTypes)

Method Detail

verify

public Record verify(List<DataBox> values)
              throws SchemaException

Verifies that a list of DataBoxes corresponds to this schema. A list of DataBoxes corresponds to this schema if the number of DataBoxes in the list equals the number of columns in this schema, and if each DataBox has the same type and size as the columns in this schema.

Parameters:

values - the list of values to check

Returns:

a new Record with the DataBoxes specified

Throws:

SchemaException - if the values specified don't conform to this Schema

encode

public byte[] encode(Record record)

Serializes the provided record into a byte[]. Uses the DataBoxes' serialization methods. A serialized record is represented as the concatenation of each serialized DataBox. This method assumes that the input record corresponds to this schema.

Parameters:

record - the record to encode

Returns:

the encoded record as a byte[]

decode

public Record decode(byte[] input)

Takes a byte[] and decodes it into a Record. This method assumes that the input byte[] represents a record that corresponds to this schema.

Parameters:

input - the byte array to decode

Returns:

the decoded Record

getEntrySize

public int getEntrySize()

getFieldNames

public List<String> getFieldNames()

getFieldTypes

public List<DataBox> getFieldTypes()

equals

public boolean equals(Object other)

Overrides:

equals in class Object