Package org.queryman.builder.token

Class Expression

java.lang.Object

org.queryman.builder.token.AbstractToken

org.queryman.builder.token.Expression

All Implemented Interfaces:

ExpressionAsStep, ExpressionCastStep, Token

Direct Known Subclasses:

ColumnReferenceExpression, NullExpression, PreparedExpression

public abstract class Expression
extends AbstractToken
implements ExpressionAsStep, ExpressionCastStep

The expression is a main part of query. Queryman Builder provides expressions showing in the list below:

• constant expression
• function call expression
• list expression
• subquery expression

Field Summary

Fields

Modifier and Type	Field	Description
protected java.lang.String	outputName	Alias of expression.

Fields inherited from class org.queryman.builder.token.AbstractToken

name

Constructor Summary

Constructors

Constructor	Description
Expression(java.lang.String constant)

Method Summary

Modifier and Type	Method	Description
Expression	as(java.lang.String alias)
Expression	as(java.lang.String alias, java.lang.String... columns)
Expression	cast(java.lang.String type)	The type follows by :: operator after expression
protected java.lang.String	getCastExpression()
java.lang.String	getName()
protected abstract java.lang.String	prepareName()
protected java.lang.String	toPostgreSQLString(java.lang.String name)	Wrap the name into single quotes

Methods inherited from class org.queryman.builder.token.AbstractToken

isEmpty, isNonEmpty, toString

Methods inherited from class java.lang.Object

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

Field Detail

outputName

protected java.lang.String outputName

Alias of expression.

Constructor Detail

Expression

public Expression(java.lang.String constant)

Method Detail

getName

public java.lang.String getName()

Specified by:

getName in interface Token

Overrides:

getName in class AbstractToken

getCastExpression

protected java.lang.String getCastExpression()

Returns:

string with expression of explicitly casting

cast

public final Expression cast(java.lang.String type)

Description copied from interface: ExpressionCastStep

The type follows by :: operator after expression

Specified by:

cast in interface ExpressionCastStep

Parameters:

type - cast type

Returns:

itself

as

public final Expression as(java.lang.String alias)

Specified by:

as in interface ExpressionAsStep

Parameters:

alias - expression alias

Returns:

itself

as

public final Expression as(java.lang.String alias,
                           java.lang.String... columns)

Specified by:

as in interface ExpressionAsStep

Parameters:

alias - expression alias

columns - aliases of output columns

Returns:

itself

toPostgreSQLString

protected java.lang.String toPostgreSQLString(java.lang.String name)

Wrap the name into single quotes

prepareName

protected abstract java.lang.String prepareName()