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The bndlib project is a general library to be used with OSGi bundles. It contains lots of cool functionality that calculates dependencies, etc.

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package aQute.bnd.osgi;

import java.io.*;

public abstract class AbstractResource implements Resource {
	String	extra;
	byte[]	calculated;
	long	lastModified;

	protected AbstractResource(long modified) {
		lastModified = modified;
	}

	public String getExtra() {
		return extra;
	}

	public long lastModified() {
		return lastModified;
	}

	public InputStream openInputStream() throws IOException {
		return new ByteArrayInputStream(getLocalBytes());
	}

	private byte[] getLocalBytes() throws IOException {
		try {
			if (calculated != null)
				return calculated;

			return calculated = getBytes();
		}
		catch (IOException e) {
			throw e;
		}
		catch (Exception e) {
			IOException ee = new IOException("Opening resource");
			ee.initCause(e);
			throw ee;
		}
	}

	public void setExtra(String extra) {
		this.extra = extra;
	}

	public void write(OutputStream out) throws IOException {
		out.write(getLocalBytes());
	}

	abstract protected byte[] getBytes() throws Exception;

	public long size() throws IOException {
		return getLocalBytes().length;
	}
}