From 26a28dd663a1dd8ca1a692c8973d3f4427ab3d36 Mon Sep 17 00:00:00 2001 From: Denis Date: Tue, 7 Aug 2018 21:28:06 +0200 Subject: [PATCH] BAEL-1997 different example code --- .../com/baeldung/state/DeliveredState.java | 19 +++++++++++ .../com/baeldung/state/ExplicitStateDemo.java | 21 ------------ .../com/baeldung/state/InternalStateDemo.java | 15 --------- .../java/com/baeldung/state/OrderedState.java | 19 +++++++++++ .../main/java/com/baeldung/state/Package.java | 22 +++++++++++++ .../java/com/baeldung/state/PackageState.java | 8 +++++ .../com/baeldung/state/ReceivedState.java | 23 +++++++++++++ .../baeldung/state/context/TradeContext.java | 29 ---------------- .../state/states/DayTradeBehavior.java | 11 ------- .../states/FallbackDayTradeBehavior.java | 16 --------- .../state/states/PositionTradeBehavior.java | 11 ------- .../state/states/SwingTradeBehavior.java | 11 ------- .../baeldung/state/states/TradeBehavior.java | 7 ---- .../baeldung/state/StatePatternUnitTest.java | 33 +++++++++++++++++++ 14 files changed, 124 insertions(+), 121 deletions(-) create mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/DeliveredState.java delete mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/ExplicitStateDemo.java delete mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/InternalStateDemo.java create mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/OrderedState.java create mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/Package.java create mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/PackageState.java create mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/ReceivedState.java delete mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/context/TradeContext.java delete mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/states/DayTradeBehavior.java delete mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/states/FallbackDayTradeBehavior.java delete mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/states/PositionTradeBehavior.java delete mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/states/SwingTradeBehavior.java delete mode 100644 patterns/design-patterns/src/main/java/com/baeldung/state/states/TradeBehavior.java create mode 100644 patterns/design-patterns/src/test/java/com/baeldung/state/StatePatternUnitTest.java diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/DeliveredState.java b/patterns/design-patterns/src/main/java/com/baeldung/state/DeliveredState.java new file mode 100644 index 0000000000..adb0fd3f5a --- /dev/null +++ b/patterns/design-patterns/src/main/java/com/baeldung/state/DeliveredState.java @@ -0,0 +1,19 @@ +package com.baeldung.state; + +public class DeliveredState implements PackageState { + + @Override + public void next(Package pkg) { + pkg.setState(new ReceivedState()); + } + + @Override + public void prev(Package pkg) { + pkg.setState(new OrderedState()); + } + + @Override + public String toString() { + return "DeliveredState{}"; + } +} \ No newline at end of file diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/ExplicitStateDemo.java b/patterns/design-patterns/src/main/java/com/baeldung/state/ExplicitStateDemo.java deleted file mode 100644 index de7b54d70e..0000000000 --- a/patterns/design-patterns/src/main/java/com/baeldung/state/ExplicitStateDemo.java +++ /dev/null @@ -1,21 +0,0 @@ -package com.baeldung.state; - -import com.baeldung.state.context.TradeContext; -import com.baeldung.state.states.DayTradeBehavior; -import com.baeldung.state.states.PositionTradeBehavior; -import com.baeldung.state.states.SwingTradeBehavior; - -public class ExplicitStateDemo { - - public static void main(String[] args) { - - TradeContext tradeContext = new TradeContext(new SwingTradeBehavior()); - tradeContext.trade(); - - tradeContext.setBehavior(new PositionTradeBehavior()); - tradeContext.trade(); - - tradeContext.setBehavior(new DayTradeBehavior()); - tradeContext.trade(); - } -} diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/InternalStateDemo.java b/patterns/design-patterns/src/main/java/com/baeldung/state/InternalStateDemo.java deleted file mode 100644 index 3148940f17..0000000000 --- a/patterns/design-patterns/src/main/java/com/baeldung/state/InternalStateDemo.java +++ /dev/null @@ -1,15 +0,0 @@ -package com.baeldung.state; - -import com.baeldung.state.context.TradeContext; -import com.baeldung.state.states.FallbackDayTradeBehavior; - -public class InternalStateDemo { - - public static void main(String[] args) { - - TradeContext tradeContext = new TradeContext(new FallbackDayTradeBehavior()); - tradeContext.trade(); - tradeContext.trade(); - tradeContext.trade(); - } -} diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/OrderedState.java b/patterns/design-patterns/src/main/java/com/baeldung/state/OrderedState.java new file mode 100644 index 0000000000..56a267f160 --- /dev/null +++ b/patterns/design-patterns/src/main/java/com/baeldung/state/OrderedState.java @@ -0,0 +1,19 @@ +package com.baeldung.state; + +public class OrderedState implements PackageState { + + @Override + public void next(Package pkg) { + pkg.setState(new DeliveredState()); + } + + @Override + public void prev(Package pkg) { + System.out.println("The package is in it's root state."); + } + + @Override + public String toString() { + return "OrderedState{}"; + } +} \ No newline at end of file diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/Package.java b/patterns/design-patterns/src/main/java/com/baeldung/state/Package.java new file mode 100644 index 0000000000..ff04d543b8 --- /dev/null +++ b/patterns/design-patterns/src/main/java/com/baeldung/state/Package.java @@ -0,0 +1,22 @@ +package com.baeldung.state; + +public class Package { + + private PackageState state = new OrderedState(); + + public PackageState getState() { + return state; + } + + public void setState(PackageState state) { + this.state = state; + } + + public void previousState() { + state.prev(this); + } + + public void nextState() { + state.next(this); + } +} diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/PackageState.java b/patterns/design-patterns/src/main/java/com/baeldung/state/PackageState.java new file mode 100644 index 0000000000..d7f7a5c110 --- /dev/null +++ b/patterns/design-patterns/src/main/java/com/baeldung/state/PackageState.java @@ -0,0 +1,8 @@ +package com.baeldung.state; + +public interface PackageState { + + void next(Package pkg); + + void prev(Package pkg); +} \ No newline at end of file diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/ReceivedState.java b/patterns/design-patterns/src/main/java/com/baeldung/state/ReceivedState.java new file mode 100644 index 0000000000..be76937159 --- /dev/null +++ b/patterns/design-patterns/src/main/java/com/baeldung/state/ReceivedState.java @@ -0,0 +1,23 @@ +package com.baeldung.state; + +public class ReceivedState implements PackageState { + + @Override + public void next(Package pkg) { + if (pkg.getState() instanceof ReceivedState) { + System.out.println("This package is already received by a client."); + return; + } + pkg.setState(this); + } + + @Override + public void prev(Package pkg) { + pkg.setState(new DeliveredState()); + } + + @Override + public String toString() { + return "ReceivedState{}"; + } +} \ No newline at end of file diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/context/TradeContext.java b/patterns/design-patterns/src/main/java/com/baeldung/state/context/TradeContext.java deleted file mode 100644 index 0f12d050db..0000000000 --- a/patterns/design-patterns/src/main/java/com/baeldung/state/context/TradeContext.java +++ /dev/null @@ -1,29 +0,0 @@ -package com.baeldung.state.context; - -import com.baeldung.state.states.TradeBehavior; - -public class TradeContext { - - private TradeBehavior behavior; - - public TradeContext(TradeBehavior behavior) { - this.behavior = behavior; - } - - public TradeBehavior getBehavior() { - return behavior; - } - - public void setBehavior(TradeBehavior behavior) { - this.behavior = behavior; - } - - public void trade() { - behavior.trade(this); - } - - @Override - public String toString() { - return "TradeContext{" + "behavior=" + behavior + '}'; - } -} diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/states/DayTradeBehavior.java b/patterns/design-patterns/src/main/java/com/baeldung/state/states/DayTradeBehavior.java deleted file mode 100644 index 540530e50b..0000000000 --- a/patterns/design-patterns/src/main/java/com/baeldung/state/states/DayTradeBehavior.java +++ /dev/null @@ -1,11 +0,0 @@ -package com.baeldung.state.states; - -import com.baeldung.state.context.TradeContext; - -public class DayTradeBehavior implements TradeBehavior { - - @Override - public void trade(TradeContext ctx) { - System.out.println("Trading method: Day Trade"); - } -} diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/states/FallbackDayTradeBehavior.java b/patterns/design-patterns/src/main/java/com/baeldung/state/states/FallbackDayTradeBehavior.java deleted file mode 100644 index cf6e3ea695..0000000000 --- a/patterns/design-patterns/src/main/java/com/baeldung/state/states/FallbackDayTradeBehavior.java +++ /dev/null @@ -1,16 +0,0 @@ -package com.baeldung.state.states; - -import com.baeldung.state.context.TradeContext; - -public class FallbackDayTradeBehavior implements TradeBehavior { - - @Override - public void trade(TradeContext ctx) { - System.out.println("Trading method: Day Trade"); - - if (Math.random() > 0.4) { - ctx.setBehavior(new SwingTradeBehavior()); - System.out.println("Day trading would not go well, falling back to Swing Trade"); - } - } -} diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/states/PositionTradeBehavior.java b/patterns/design-patterns/src/main/java/com/baeldung/state/states/PositionTradeBehavior.java deleted file mode 100644 index 0b1facb143..0000000000 --- a/patterns/design-patterns/src/main/java/com/baeldung/state/states/PositionTradeBehavior.java +++ /dev/null @@ -1,11 +0,0 @@ -package com.baeldung.state.states; - -import com.baeldung.state.context.TradeContext; - -public class PositionTradeBehavior implements TradeBehavior { - - @Override - public void trade(TradeContext ctx) { - System.out.println("Trading method: Position Trade"); - } -} diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/states/SwingTradeBehavior.java b/patterns/design-patterns/src/main/java/com/baeldung/state/states/SwingTradeBehavior.java deleted file mode 100644 index bbe8091bed..0000000000 --- a/patterns/design-patterns/src/main/java/com/baeldung/state/states/SwingTradeBehavior.java +++ /dev/null @@ -1,11 +0,0 @@ -package com.baeldung.state.states; - -import com.baeldung.state.context.TradeContext; - -public class SwingTradeBehavior implements TradeBehavior { - - @Override - public void trade(TradeContext ctx) { - System.out.println("Trading method: Swing Trade"); - } -} diff --git a/patterns/design-patterns/src/main/java/com/baeldung/state/states/TradeBehavior.java b/patterns/design-patterns/src/main/java/com/baeldung/state/states/TradeBehavior.java deleted file mode 100644 index ef5554ab50..0000000000 --- a/patterns/design-patterns/src/main/java/com/baeldung/state/states/TradeBehavior.java +++ /dev/null @@ -1,7 +0,0 @@ -package com.baeldung.state.states; - -import com.baeldung.state.context.TradeContext; - -public interface TradeBehavior { - void trade(TradeContext ctx); -} diff --git a/patterns/design-patterns/src/test/java/com/baeldung/state/StatePatternUnitTest.java b/patterns/design-patterns/src/test/java/com/baeldung/state/StatePatternUnitTest.java new file mode 100644 index 0000000000..731974f92b --- /dev/null +++ b/patterns/design-patterns/src/test/java/com/baeldung/state/StatePatternUnitTest.java @@ -0,0 +1,33 @@ +package com.baeldung.state; + +import com.baeldung.state.Package; + +import static org.junit.Assert.assertThat; +import static org.hamcrest.CoreMatchers.instanceOf; + +import org.junit.Test; + +public class StatePatternUnitTest { + + @Test + public void givenNewPackage_whenPackageReceived_thenStateReceived() { + Package pkg = new Package(); + + assertThat(pkg.getState(), instanceOf(OrderedState.class)); + pkg.nextState(); + + assertThat(pkg.getState(), instanceOf(DeliveredState.class)); + pkg.nextState(); + + assertThat(pkg.getState(), instanceOf(ReceivedState.class)); + } + + @Test + public void givenDeliveredPackage_whenPrevState_thenStateOrdered() { + Package pkg = new Package(); + pkg.setState(new DeliveredState()); + pkg.previousState(); + + assertThat(pkg.getState(), instanceOf(OrderedState.class)); + } +}