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Ejemplo del patrón de diseño State
http://elblogdepicodev.blogspot.com/2013/08/ejemplo-del-patron-de-diseno-state.html
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package es.com.blogspot.elblogdepicodev.pattern.state.compraState; | |
import java.math.BigDecimal; | |
import java.text.MessageFormat; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra.FormaEnvio; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra.FormaPago; | |
public abstract class AbstractCompraState implements CompraState { | |
private Compra compra; | |
public AbstractCompraState(Compra compra) { | |
this.compra = compra; | |
} | |
public Compra getCompra() { | |
return compra; | |
} | |
@Override | |
public void comprar(BigDecimal precio, FormaPago formaPago, FormaEnvio formaEnvio) { | |
throw new IllegalStateException(MessageFormat.format("La compra en estado {0} no puede comprarse", compra.getEstado().getClass().getSimpleName())); | |
} | |
@Override | |
public void verificar() { | |
throw new IllegalStateException(MessageFormat.format("La compra en estado {0} no puede verificarse", compra.getEstado().getClass().getSimpleName())); | |
} | |
@Override | |
public void cancelar() { | |
throw new IllegalStateException(MessageFormat.format("La compra en estado {0} no puede cancelarse", compra.getEstado().getClass().getSimpleName())); | |
} | |
@Override | |
public void enviar() { | |
throw new IllegalStateException(MessageFormat.format("La compra en estado {0} no puede enviarse", compra.getEstado().getClass().getSimpleName())); | |
} | |
} |
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package es.com.blogspot.elblogdepicodev.pattern.state.compraState; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra; | |
public class CanceladaCompraState extends AbstractCompraState { | |
public CanceladaCompraState(Compra compra) { | |
super(compra); | |
} | |
} |
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package es.com.blogspot.elblogdepicodev.pattern.state; | |
import java.math.BigDecimal; | |
import es.com.blogspot.elblogdepicodev.pattern.state.CompraStateFactory.Estado; | |
import es.com.blogspot.elblogdepicodev.pattern.state.compraState.CompraState; | |
public class Compra { | |
public enum FormaPago { | |
PAYPAL, TARJETA_CREDITO | |
} | |
public enum FormaEnvio { | |
UPS, TNT, SEUR | |
} | |
private CompraState estado; | |
private BigDecimal precio; | |
private FormaPago formaPago; | |
private FormaEnvio formaEnvio; | |
public Compra() { | |
setEstado(Estado.CREADA); | |
} | |
public CompraState getEstado() { | |
return estado; | |
} | |
public void setEstado(CompraState estado) { | |
this.estado = estado; | |
} | |
public void setEstado(Estado estado) { | |
this.estado = CompraStateFactory.buildState(estado, this); | |
} | |
public BigDecimal getPrecio() { | |
return precio; | |
} | |
public void setPrecio(BigDecimal precio) { | |
this.precio = precio; | |
} | |
public FormaPago getFormaPago() { | |
return formaPago; | |
} | |
public void setFormaPago(FormaPago formaPago) { | |
this.formaPago = formaPago; | |
} | |
public FormaEnvio getFormaEnvio() { | |
return formaEnvio; | |
} | |
public void setFormaEnvio(FormaEnvio formaEnvio) { | |
this.formaEnvio = formaEnvio; | |
} | |
} |
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package es.com.blogspot.elblogdepicodev.pattern.state.compraState; | |
import java.math.BigDecimal; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra.FormaEnvio; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra.FormaPago; | |
public interface CompraState { | |
void comprar(BigDecimal precio, FormaPago formaPago, FormaEnvio formaEnvio); | |
void verificar(); | |
void cancelar(); | |
void enviar(); | |
} |
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package es.com.blogspot.elblogdepicodev.pattern.state; | |
import es.com.blogspot.elblogdepicodev.pattern.state.compraState.CanceladaCompraState; | |
import es.com.blogspot.elblogdepicodev.pattern.state.compraState.CompraState; | |
import es.com.blogspot.elblogdepicodev.pattern.state.compraState.CreadaCompraState; | |
import es.com.blogspot.elblogdepicodev.pattern.state.compraState.EnEsperaCompraState; | |
import es.com.blogspot.elblogdepicodev.pattern.state.compraState.EnviadaCompraState; | |
import es.com.blogspot.elblogdepicodev.pattern.state.compraState.VerificadaCompraState; | |
public class CompraStateFactory { | |
public enum Estado { | |
CREADA, EN_ESPERA, VERIFICADA, CANCELADA, ENVIADA | |
} | |
public static CompraState buildState(Estado estado, Compra compra) { | |
CompraState cs = null; | |
switch (estado) { | |
case CREADA: | |
cs = new CreadaCompraState(compra); | |
break; | |
case EN_ESPERA: | |
cs = new EnEsperaCompraState(compra); | |
break; | |
case VERIFICADA: | |
cs = new VerificadaCompraState(compra); | |
break; | |
case CANCELADA: | |
cs = new CanceladaCompraState(compra); | |
break; | |
case ENVIADA: | |
cs = new EnviadaCompraState(compra); | |
break; | |
default: | |
throw new IllegalArgumentException(); | |
} | |
return cs; | |
} | |
} |
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package es.com.blogspot.elblogdepicodev.pattern.state.compraState; | |
import java.math.BigDecimal; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra.FormaEnvio; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra.FormaPago; | |
import es.com.blogspot.elblogdepicodev.pattern.state.CompraStateFactory.Estado; | |
public class CreadaCompraState extends AbstractCompraState { | |
public CreadaCompraState(Compra compra) { | |
super(compra); | |
} | |
@Override | |
public void comprar(BigDecimal precio, FormaPago formaPago, FormaEnvio formaEnvio) { | |
getCompra().setPrecio(precio); | |
getCompra().setFormaPago(formaPago); | |
getCompra().setFormaEnvio(formaEnvio); | |
getCompra().setEstado(Estado.EN_ESPERA); | |
} | |
@Override | |
public void cancelar() { | |
getCompra().setEstado(Estado.CANCELADA); | |
} | |
} |
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package es.com.blogspot.elblogdepicodev.pattern.state.compraState; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra; | |
import es.com.blogspot.elblogdepicodev.pattern.state.CompraStateFactory.Estado; | |
public class EnEsperaCompraState extends AbstractCompraState { | |
public EnEsperaCompraState(Compra compra) { | |
super(compra); | |
} | |
@Override | |
public void verificar() { | |
getCompra().setEstado(Estado.VERIFICADA); | |
} | |
@Override | |
public void cancelar() { | |
getCompra().setEstado(Estado.CANCELADA); | |
} | |
} |
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package es.com.blogspot.elblogdepicodev.pattern.state.compraState; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra; | |
public class EnviadaCompraState extends AbstractCompraState { | |
public EnviadaCompraState(Compra compra) { | |
super(compra); | |
} | |
} |
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$ git clone git://github.com/picodotdev/elblogdepicodev.git | |
$ cd elblogdepicodev/PatronState | |
$ ./gradlew test |
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package es.com.blogspot.elblogdepicodev.pattern.state.compraState; | |
import es.com.blogspot.elblogdepicodev.pattern.state.Compra; | |
import es.com.blogspot.elblogdepicodev.pattern.state.CompraStateFactory.Estado; | |
public class VerificadaCompraState extends AbstractCompraState { | |
public VerificadaCompraState(Compra compra) { | |
super(compra); | |
} | |
@Override | |
public void enviar() { | |
getCompra().setEstado(Estado.ENVIADA); | |
} | |
} |
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