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An utility library for spring-based web-services for compressing / optimizing JS and CSS resources.

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/**
 * Copyright 2012 the project-owners
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package inti.ws.spring.resource;

import inti.util.NotifyingInputStream;
import inti.util.NotifyingInputStream.ReadNotifier;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class ResourceWorkingContext {

	MessageDigest digest;
	StringBuilder builder = new StringBuilder(128);
	NotifyingInputStream notifyingInputStream = new NotifyingInputStream();

	public ResourceWorkingContext() {
		try {
			digest = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException exception) {
		}

		notifyingInputStream.setNotifier(new ReadNotifier() {

			@Override
			public void read(byte[] data, int offset, int length) {
				if (length > 0) {
					digest.update(data, offset, length);
				}
			}

			@Override
			public void read(int b) {
				if (b >= 0 && b <= 255) {
					digest.update((byte) b);
				}
			}

			@Override
			public void close() {
			}

		});
	}

	public StringBuilder getBuilder() {
		return builder;
	}

	public MessageDigest getDigest() {
		return digest;
	}

	public NotifyingInputStream getNotifyingInputStream() {
		return notifyingInputStream;
	}

	public void clearBuilder() {
		builder.delete(0, builder.length());
	}

}