gaspersic/java-design-patterns
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Improved encapsulation of the Memento pattern by moving the

Browse Source 
StarMementoInternal class to inner class of Star.
This commit is contained in:
Ilkka Seppala 2015-05-30 12:36:53 +03:00
parent 72bc96f81b
commit 703ebd3e20
7 changed files with 142 additions and 143 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
README.md
View File

@ -353,7 +353,7 @@ A programming idiom is a means of expressing a recurring construct in one or mor
## <a name="memento">Memento</a> [&#8593;](#list-of-design-patterns) ## <a name="memento">Memento</a> [&#8593;](#list-of-design-patterns)
**Intent:** Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later. **Intent:** Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later.
![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/memento/etc/memento_1.png "Memento") ![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/memento/etc/memento.png "Memento")
**Applicability:** Use the Memento pattern when **Applicability:** Use the Memento pattern when
* a snapshot of an object's state must be saved so that it can be restored to that state later, and * a snapshot of an object's state must be saved so that it can be restored to that state later, and

BIN
memento/etc/memento.jpg
View File

Binary file not shown.
Side by Side

Before

Width:  |  Height:  |  Size: 57 KiB

BIN
memento/etc/memento.png Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 22 KiB

72
memento/etc/test.ucls → memento/etc/memento.ucls
View File

@ -1,65 +1,65 @@
<?xml version="1.0" encoding="UTF-8"?> <?xml version="1.0" encoding="UTF-8"?>
<class-diagram version="1.1.7" icons="true" always-add-relationships="false" generalizations="true" realizations="true" <class-diagram version="1.1.8" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true"
associations="true" dependencies="false" nesting-relationships="true"> realizations="true" associations="true" dependencies="false" nesting-relationships="true">
<class id="1" language="java" name="com.iluwatar.Star" project="memento" <class id="1" language="java" name="com.iluwatar.Star" project="memento"
file="/memento/src/main/java/com/iluwatar/Star.java" binary="false" corner="BOTTOM_RIGHT"> file="/memento/src/main/java/com/iluwatar/Star.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="383" y="159"/> <position height="-1" width="-1" x="301" y="385"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true"> sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/> <attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/> <operations public="true" package="true" protected="true" private="true" static="true"/>
</display> </display>
</class> </class>
<class id="2" language="java" name="com.iluwatar.StarMementoInternal" project="memento" <enumeration id="2" language="java" name="com.iluwatar.StarType" project="memento"
file="/memento/src/main/java/com/iluwatar/StarMementoInternal.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="697" y="141"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<enumeration id="3" language="java" name="com.iluwatar.StarType" project="memento"
file="/memento/src/main/java/com/iluwatar/StarType.java" binary="false" corner="BOTTOM_RIGHT"> file="/memento/src/main/java/com/iluwatar/StarType.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="533" y="429"/> <position height="-1" width="-1" x="301" y="911"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true"> sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/> <attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/> <operations public="true" package="true" protected="true" private="true" static="true"/>
</display> </display>
</enumeration> </enumeration>
<interface id="4" language="java" name="com.iluwatar.StarMemento" project="memento" <interface id="3" language="java" name="com.iluwatar.StarMemento" project="memento"
file="/memento/src/main/java/com/iluwatar/StarMemento.java" binary="false" corner="BOTTOM_RIGHT"> file="/memento/src/main/java/com/iluwatar/StarMemento.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="536" y="-17"/> <position height="-1" width="-1" x="103" y="830"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true"> sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/> <attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/> <operations public="true" package="true" protected="true" private="true" static="true"/>
</display> </display>
</interface> </interface>
<dependency id="5"> <class id="4" language="java" name="com.iluwatar.Star.StarMementoInternal" project="memento"
file="/memento/src/main/java/com/iluwatar/Star.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="103" y="639"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<association id="5">
<end type="SOURCE" refId="1" navigable="false">
<attribute id="6" name="type"/>
<multiplicity id="7" minimum="0" maximum="1"/>
</end>
<end type="TARGET" refId="2" navigable="true"/>
<display labels="true" multiplicity="true"/>
</association>
<association id="8">
<end type="SOURCE" refId="4" navigable="false">
<attribute id="9" name="type"/>
<multiplicity id="10" minimum="0" maximum="1"/>
</end>
<end type="TARGET" refId="2" navigable="true"/>
<display labels="true" multiplicity="true"/>
</association>
<nesting id="11">
<end type="SOURCE" refId="1"/> <end type="SOURCE" refId="1"/>
<end type="TARGET" refId="4"/> <end type="TARGET" refId="4"/>
</dependency> </nesting>
<association id="6">
<end type="SOURCE" refId="1" navigable="false">
<attribute id="7" name="type"/>
<multiplicity id="8" minimum="0" maximum="1"/>
</end>
<end type="TARGET" refId="3" navigable="true"/>
<display labels="true" multiplicity="true"/>
</association>
<association id="9">
<end type="SOURCE" refId="2" navigable="false">
<attribute id="10" name="type"/>
<multiplicity id="11" minimum="0" maximum="1"/>
</end>
<end type="TARGET" refId="3" navigable="true"/>
<display labels="true" multiplicity="true"/>
</association>
<realization id="12"> <realization id="12">
<end type="SOURCE" refId="2"/> <end type="SOURCE" refId="4"/>
<end type="TARGET" refId="4"/> <end type="TARGET" refId="3"/>
</realization> </realization>
<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" <classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true"> sort-features="false" accessors="true" visibility="true">

BIN
memento/etc/memento_1.png
View File

Binary file not shown.
Side by Side

Before

Width:  |  Height:  |  Size: 34 KiB

36
memento/src/main/java/com/iluwatar/Star.java
View File

@ -66,4 +66,40 @@ public class Star {
return String.format("%s age: %d years mass: %d tons", type.toString(), return String.format("%s age: %d years mass: %d tons", type.toString(),
ageYears, massTons); ageYears, massTons);
} }
/**
*
* StarMemento implementation
*
*/
private static class StarMementoInternal implements StarMemento {
private StarType type;
private int ageYears;
private int massTons;
public StarType getType() {
return type;
}
public void setType(StarType type) {
this.type = type;
}
public int getAgeYears() {
return ageYears;
}
public void setAgeYears(int ageYears) {
this.ageYears = ageYears;
}
public int getMassTons() {
return massTons;
}
public void setMassTons(int massTons) {
this.massTons = massTons;
}
}
} }

37
memento/src/main/java/com/iluwatar/StarMementoInternal.java
View File

@ -1,37 +0,0 @@
package com.iluwatar;
/**
*
* Internal interface to memento.
*
*/
public class StarMementoInternal implements StarMemento {
private StarType type;
private int ageYears;
private int massTons;
public StarType getType() {
return type;
}
public void setType(StarType type) {
this.type = type;
}
public int getAgeYears() {
return ageYears;
}
public void setAgeYears(int ageYears) {
this.ageYears = ageYears;
}
public int getMassTons() {
return massTons;
}
public void setMassTons(int massTons) {
this.massTons = massTons;
}
}