001/** 002 * Copyright 2015 DuraSpace, Inc. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.fcrepo.kernel.modeshape.utils; 017 018import java.io.InputStream; 019import java.security.DigestInputStream; 020import java.security.MessageDigest; 021 022import org.apache.commons.io.input.CountingInputStream; 023 024/** 025 * An InputStream wrapper that calculates the size and digest 026 * while reading from the stream. 027 * @author Chris Beer 028 * @since Mar 12, 2013 029 */ 030public class FixityInputStream extends CountingInputStream { 031 032 /** 033 * Creates a <code>FilterInputStream</code> by assigning the 034 * argument <code>in</code> to the field <code>this.in</code> 035 * so as to remember it for later use. 036 * 037 * @param in the underlying input stream, or <code>null</code> if 038 * this instance is to be created without an underlying stream. 039 * @param digest the given digest 040 */ 041 public FixityInputStream(final InputStream in, final MessageDigest digest) { 042 super(new DigestInputStream(in, digest)); 043 } 044 045 /** 046 * Retrieve the calculated digest for the input stream 047 * @return digest for this input stream 048 */ 049 public MessageDigest getMessageDigest() { 050 return ((DigestInputStream) in).getMessageDigest(); 051 } 052 053}