com.healthmarketscience.sqlbuilder

Class SimpleCaseStatement

java.lang.Object

com.healthmarketscience.common.util.AppendeeObject

com.healthmarketscience.sqlbuilder.SqlObject

com.healthmarketscience.sqlbuilder.Expression

com.healthmarketscience.sqlbuilder.BaseCaseStatement<SimpleCaseStatement>

com.healthmarketscience.sqlbuilder.SimpleCaseStatement

All Implemented Interfaces:

Appendee, Verifiable<SimpleCaseStatement>

public class SimpleCaseStatement
extends BaseCaseStatement<SimpleCaseStatement>

Outputs a simple case statement like: "CASE <column1> WHEN <val1> THEN <result1> [ WHEN <val2> THEN <result2> WHEN ... ] [ELSE <resultN>] END" (where the values are numeric/string values).

Author:

James Ahlborn

Field Summary

Fields inherited from class com.healthmarketscience.sqlbuilder.Expression

EMPTY

Fields inherited from class com.healthmarketscience.sqlbuilder.SqlObject

ALL_SYMBOL, NULL_VALUE, QUESTION_MARK

Constructor Summary

Constructors

Constructor and Description
SimpleCaseStatement(Column column)
SimpleCaseStatement(Object operand) Object -> SqlObject conversions handled by Converter.toColumnSqlObject(Object).

Method Summary

Modifier and Type	Method and Description
SimpleCaseStatement	addNumericWhen(Object value, Object result) Adds a "WHEN" clause to the "CASE" statement.
SimpleCaseStatement	addWhen(String value, Object result) Adds a "WHEN" clause to the "CASE" statement.
protected void	appendCustomIfNotNull(AppendableExt app, SqlObject obj) Appends the given custom clause to the given AppendableExt, handling null and enclosing parens.
protected void	appendNestedClauses(AppendableExt app, SqlObjectList<? extends com.healthmarketscience.sqlbuilder.NestableClause> nestedClauses) Appends the given nested clauses to the given AppendableExt, handling empty nested clauses and enclosing parens.
protected static boolean	areEmpty(SqlObjectList<? extends com.healthmarketscience.sqlbuilder.NestableClause> nestedClauses) Determines if any of the given clauses are non-empty.
protected void	closeParen(AppendableExt app) Appends a close parenthesis to the given AppendableExt if disableParens is true, otherwise does nothing.
boolean	hasParens() Returns true iff the output of this instance would include surrounding parentheses, false otherwise.
protected static boolean	hasParens(SqlObjectList<? extends com.healthmarketscience.sqlbuilder.NestableClause> nestedClauses) Determines if any of the given clauses are non-empty.
boolean	isDisableParens() Returns whether or not wrapping parentheses are disabled for this clause (for clauses which utilize wrapping parentheses).
protected void	openParen(AppendableExt app) Appends an open parenthesis to the given AppendableExt if disableParens is true, otherwise does nothing.

Methods inherited from class com.healthmarketscience.sqlbuilder.BaseCaseStatement

addCustomWhen, addElse, addElseNull, appendTo, collectSchemaObjects, getThisType, isEmpty, validate, validate

Methods inherited from class com.healthmarketscience.sqlbuilder.Expression

setDisableParens

Methods inherited from class com.healthmarketscience.sqlbuilder.SqlObject

collectSchemaObjects, doValidate, toString

Methods inherited from class com.healthmarketscience.common.util.AppendeeObject

toString, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleCaseStatement

public SimpleCaseStatement(Column column)

Parameters:

column - the column to reference at the beginning of the "CASE" statement

SimpleCaseStatement

public SimpleCaseStatement(Object operand)

Object -> SqlObject conversions handled by Converter.toColumnSqlObject(Object).

Parameters:

operand - the custom column to reference at the beginning of the "CASE" statement

Method Detail

addNumericWhen

public SimpleCaseStatement addNumericWhen(Object value,
                                          Object result)

Adds a "WHEN" clause to the "CASE" statement.

Value Object -> SqlObject conversions handled by Converter.toValueSqlObject(Object). Result Object -> SqlObject conversions handled by Converter.toColumnSqlObject(Object).

Parameters:

value - the value to test against the column of this "CASE" statement

result - the result to output if this "WHEN" clause is selected

addWhen

public SimpleCaseStatement addWhen(String value,
                                   Object result)

Adds a "WHEN" clause to the "CASE" statement.

Result Object -> SqlObject conversions handled by Converter.toColumnSqlObject(Object).

Parameters:

value - the value to test against the column of this "CASE" statement

result - the result to output if this "WHEN" clause is selected

isDisableParens

public boolean isDisableParens()

Returns whether or not wrapping parentheses are disabled for this clause (for clauses which utilize wrapping parentheses). Defaults to false.

hasParens

public boolean hasParens()

Returns true iff the output of this instance would include surrounding parentheses, false otherwise.

Default implementation returns !isEmpty() && !isDisableParens().

areEmpty

protected static boolean areEmpty(SqlObjectList<? extends com.healthmarketscience.sqlbuilder.NestableClause> nestedClauses)

Determines if any of the given clauses are non-empty.

Returns:

false if at least one clause is non-empty, true otherwise

hasParens

protected static boolean hasParens(SqlObjectList<? extends com.healthmarketscience.sqlbuilder.NestableClause> nestedClauses)

Determines if any of the given clauses are non-empty.

Returns:

false if at least one clause is non-empty, true otherwise

openParen

protected void openParen(AppendableExt app)
                  throws IOException

Appends an open parenthesis to the given AppendableExt if disableParens is true, otherwise does nothing.

Throws:

IOException

closeParen

protected void closeParen(AppendableExt app)
                   throws IOException

Appends a close parenthesis to the given AppendableExt if disableParens is true, otherwise does nothing.

Throws:

IOException

appendCustomIfNotNull

protected void appendCustomIfNotNull(AppendableExt app,
                                     SqlObject obj)
                              throws IOException

Appends the given custom clause to the given AppendableExt, handling null and enclosing parens.

Throws:

IOException

appendNestedClauses

protected void appendNestedClauses(AppendableExt app,
                                   SqlObjectList<? extends com.healthmarketscience.sqlbuilder.NestableClause> nestedClauses)
                            throws IOException

Appends the given nested clauses to the given AppendableExt, handling empty nested clauses and enclosing parens.

Throws:

IOException