Design Pattern: Composite

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Định nghĩa: the composite pattern is a partitioning design pattern. The composite pattern describes that a group of objects are to be treated in the same way as a single instance of an object. The intent of a composite is to “compose” objects into tree structures to represent part-whole hierarchies. Implementing the composite pattern lets clients treat individual objects and compositions uniformly.[1]

[code java=”lang”] <pre>
public class Directory {
private Directory directory;
private File[] files;

public Directory(File[] files) {
this.files = files;
}

public Directory(Directory directory, File[] files) {
this.directory = directory;
this.files = files;
}
boolean isDirectory() {
return files != null;
}
boolean isFile() {
return files ==null;
}

public Directory getDirectory() {
return directory;
}

public void setDirectory(Directory directory) {
this.directory = directory;
}

public File[] getFiles() {
return files;
}

public void setFiles(File[] files) {
this.files = files;
}

}
[/code]

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