001/* 002 * Licensed to DuraSpace under one or more contributor license agreements. 003 * See the NOTICE file distributed with this work for additional information 004 * regarding copyright ownership. 005 * 006 * DuraSpace licenses this file to you under the Apache License, 007 * Version 2.0 (the "License"); you may not use this file except in 008 * compliance with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.fcrepo.kernel.modeshape.utils; 019 020import java.io.InputStream; 021import java.security.DigestInputStream; 022import java.security.MessageDigest; 023 024import org.apache.commons.io.input.CountingInputStream; 025 026/** 027 * An InputStream wrapper that calculates the size and digest 028 * while reading from the stream. 029 * @author Chris Beer 030 * @since Mar 12, 2013 031 */ 032public class FixityInputStream extends CountingInputStream { 033 034 /** 035 * Creates a <code>FilterInputStream</code> by assigning the 036 * argument <code>in</code> to the field <code>this.in</code> 037 * so as to remember it for later use. 038 * 039 * @param in the underlying input stream, or <code>null</code> if 040 * this instance is to be created without an underlying stream. 041 * @param digest the given digest 042 */ 043 public FixityInputStream(final InputStream in, final MessageDigest digest) { 044 super(new DigestInputStream(in, digest)); 045 } 046 047 /** 048 * Retrieve the calculated digest for the input stream 049 * @return digest for this input stream 050 */ 051 public MessageDigest getMessageDigest() { 052 return ((DigestInputStream) in).getMessageDigest(); 053 } 054 055}