gr.uoa.di.madgik.searchlibrary.operatorlibrary.join

Enum RecordGenerationPolicy

java.lang.Object

java.lang.Enum<RecordGenerationPolicy>

gr.uoa.di.madgik.searchlibrary.operatorlibrary.join.RecordGenerationPolicy

All Implemented Interfaces:

Serializable, Comparable<RecordGenerationPolicy>

public enum RecordGenerationPolicy
extends Enum<RecordGenerationPolicy>

Enum Constant Summary

Enum Constants

Enum Constant and Description
Concatenate The normal join operation policy.
KeepLeft Only the fields of the left input are kept.
KeepRight Similar to the RecordCreationPolicy#KeepLeft option.

Method Summary

Modifier and Type	Method and Description
static RecordGenerationPolicy	valueOf(String name) Returns the enum constant of this type with the specified name.
static RecordGenerationPolicy[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

Concatenate

public static final RecordGenerationPolicy Concatenate

The normal join operation policy. Each record produced by the operation will consist of the concatenation of the fields of the left input with those of the right input excluding the join key of the right input (that is, the join key of the left input is kept)

KeepLeft

public static final RecordGenerationPolicy KeepLeft

Only the fields of the left input are kept. Useful if the intention of the client is to simulate the intersection operation. Note that an additional duplicate elimination step is necessary in order to obtain the proper intersection of the two inputs

KeepRight

public static final RecordGenerationPolicy KeepRight

Similar to the RecordCreationPolicy#KeepLeft option. Included for completeness

Method Detail

values

public static RecordGenerationPolicy[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (RecordGenerationPolicy c : RecordGenerationPolicy.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static RecordGenerationPolicy valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null