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| Code Block | ||
|---|---|---|
| ||
package MementoPattern;
//This is our Memento
public class EditorState {
private final String content;
public EditorState(String content) {
this.content = content;
}
public String getContent() {
return content;
}
} |
The EditorState class serves as the Memento and is responsible for storing the state of an editor. Let's break down the code:
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| Code Block | ||
|---|---|---|
| ||
package MementoPattern;
//This is out Originator
public class Editor {
private String content;
public EditorState createState() {
return new EditorState(content);
}
public void restore(EditorState state) {
content = state.getContent();
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
|
The provided code represents an Originator class in the context of the Memento design pattern.
...
| Code Block |
|---|
package MementoPattern;
import java.util.ArrayList;
import java.util.List;
//This is out Caretaker
public class History {
//We could actually use a stack here - but I have chosen to use a LIST
private List<EditorState> states = new ArrayList<>();
public void push(EditorState state) {
states.add(state);
}
public EditorState pop() {
var lastIndex = states.size() - 1;
var lastState = states.get(lastIndex);
states.remove(lastState);
return lastState;
}
} |
The provided code represents a Caretaker class in the context of the Memento design pattern.
...