Created
July 25, 2020 14:59
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Code segment from https://masterex.github.io/archive/2020/07/25/decorator-design-pattern-synergies.html
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| public class OutputStreamAdapter extends OutputStream implements Appendable, Closeable { | |
| private OutputStream os; | |
| private CheckedOutputStream cos; | |
| private DeflaterOutputStream dos; | |
| private Appendable appendable; | |
| private PrintStream pos; | |
| public OutputStreamAdapter(OutputStream os) { | |
| setOutputStream(os); | |
| } | |
| public void addOutputStream(OutputStream o) { | |
| setOutputStream(o); | |
| } | |
| private void setOutputStream(OutputStream o) { | |
| os = o; | |
| if (o instanceof CheckedOutputStream) { | |
| cos = (CheckedOutputStream) o; | |
| } | |
| if (o instanceof DeflaterOutputStream) { | |
| dos = (DeflaterOutputStream) o; | |
| } | |
| if (o instanceof Appendable) { | |
| appendable = (Appendable) o; | |
| } | |
| if (o instanceof PrintStream) { | |
| pos = (PrintStream) o; | |
| } | |
| } | |
| @Override | |
| public void write(int i) throws IOException { | |
| os.write(i); | |
| } | |
| public Checksum getChecksum() { | |
| if (cos != null) { | |
| return cos.getChecksum(); | |
| } else if (os instanceof OutputStreamAdapter) { | |
| return ((OutputStreamAdapter) os).getChecksum(); | |
| } | |
| throw new UnsupportedOperationException("Decorator method not implemented."); | |
| } | |
| public void finish() throws IOException { | |
| if (dos != null) { | |
| dos.finish(); | |
| } else if (os instanceof OutputStreamAdapter) { | |
| ((OutputStreamAdapter) os).finish(); | |
| } | |
| throw new UnsupportedOperationException("Decorator method not implemented."); | |
| } | |
| @Override | |
| public void flush() throws IOException { | |
| os.flush(); | |
| } | |
| @Override | |
| public void write(byte[] b, int off, int len) throws IOException { | |
| os.write(b, off, len); | |
| } | |
| @Override | |
| public void write(byte[] b) throws IOException { | |
| System.out.println("WRITE!"); | |
| os.write(b); | |
| } | |
| @Override | |
| public void close() throws IOException { | |
| os.close(); | |
| } | |
| @Override | |
| public Appendable append(CharSequence cs) throws IOException { | |
| if (appendable != null) { | |
| appendable.append(cs); | |
| } | |
| throw new UnsupportedOperationException("Decorator method not implemented."); | |
| } | |
| @Override | |
| public Appendable append(CharSequence cs, int i, int i1) throws IOException { | |
| if (appendable != null) { | |
| appendable.append(cs, i, i1); | |
| } | |
| throw new UnsupportedOperationException("Decorator method not implemented."); | |
| } | |
| @Override | |
| public Appendable append(char c) throws IOException { | |
| if (appendable != null) { | |
| appendable.append(c); | |
| } | |
| throw new UnsupportedOperationException("Decorator method not implemented."); | |
| } | |
| public void println(String x) { | |
| if (pos != null) { | |
| pos.println(x); | |
| } else { | |
| throw new UnsupportedOperationException("Decorator method not implemented."); | |
| } | |
| } | |
| } |
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