svn-gvsig-desktop / trunk / libraries / libGDBMS / src / main / java / com / hardcode / gdbms / engine / strategies / Strategy.java @ 4048
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package com.hardcode.gdbms.engine.strategies; |
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import com.hardcode.driverManager.DriverLoadException; |
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import com.hardcode.gdbms.engine.data.driver.DriverException; |
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import com.hardcode.gdbms.engine.instruction.CustomAdapter; |
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import com.hardcode.gdbms.engine.instruction.EvaluationException; |
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import com.hardcode.gdbms.engine.instruction.SelectAdapter; |
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import com.hardcode.gdbms.engine.instruction.SemanticException; |
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import com.hardcode.gdbms.engine.instruction.UnionAdapter; |
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import com.hardcode.gdbms.parser.ParseException; |
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import java.io.IOException; |
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/**
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* Interfaz que define las operaciones que se pueden realizar con los
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* DataSource. Las distintas implementaciones de esta interfaz ser?n las
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* encargadas del uso de los indices, del algoritmo usado para cada operaci?n,
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* ...
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*/
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public abstract class Strategy { |
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/**
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* Realiza una select a partir de la instrucci?n que se pasa como par?metro
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*
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* @param instr Objeto con la informaci?n sobre las tablas que entran en
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* juego en la instrucci?n, campos, expresiones condicionales, ...
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*
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* @return DataSource con el resultado de la instruccion
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*
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* @throws DriverException Excepci?n que indica error del driver accediendo
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* a los datos
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* @throws SemanticException Si se produce alg?n error sem?ntico
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* @throws IOException Si se produce un error accediendo a las estructuras
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* de datos internas
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* @throws EvaluationException If the evaluation of any expression fails
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* @throws RuntimeException bug
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*/
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public OperationDataSource select(SelectAdapter instr)
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throws DriverException, SemanticException, IOException, |
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EvaluationException { |
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throw new RuntimeException( |
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"This strategy does not support select execution");
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} |
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/**
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* Realiza una union a partir de la instrucci?n que se pasa como par?metro
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*
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* @param instr Objeto con la informaci?n sobre las tablas que entran en
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* juego en la instrucci?n
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*
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* @return DataSource con el resultado de la instruccion
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*
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* @throws DriverException Excepci?n que indica error del driver accediendo
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* a los datos
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* @throws IOException Si se produce un erro accediendo a los datos
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* @throws SemanticException Si se produce alg?n error sem?ntico
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* @throws EvaluationException If there's any problem during expresion evaluation
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* @throws ParseException If the union statement contains a select statement and its parse fails
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* @throws DriverLoadException If cannot find the suitable driver to access the data
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* @throws RuntimeException bug
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*/
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public OperationDataSource union(UnionAdapter instr)
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throws DriverException, IOException, SemanticException, DriverLoadException, ParseException, EvaluationException { |
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throw new RuntimeException( |
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"This strategy does not support union execution");
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} |
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/**
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* Makes a custom query
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*
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* @param instr The instruction specifying the custom query
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*
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* @return The result DataSource
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*
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* @throws SemanticException If there is some semantic error in the
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* expression
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* @throws RuntimeException bug
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*/
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public OperationDataSource custom(CustomAdapter instr)
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throws SemanticException {
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throw new RuntimeException( |
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"This strategy does not support custom queries execution");
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} |
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} |