org.mycore.common.content.MCRByteContent Maven / Gradle / Ivy
/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MyCoRe is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MyCoRe. If not, see .
*/
package org.mycore.common.content;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
import java.util.Arrays;
import org.mycore.common.content.streams.MCRMD5InputStream;
/**
* Reads MCRContent from a byte[] array.
*
* @author Frank L\u00FCtzenkichen
*/
public class MCRByteContent extends MCRContent {
private byte[] bytes;
private int offset;
private int length;
private long lastModified;
public MCRByteContent(byte[] bytes) {
this(bytes, 0, bytes.length);
}
public MCRByteContent(byte[] bytes, int offset, int length) {
this(bytes, offset, length, System.currentTimeMillis());
}
public MCRByteContent(byte[] bytes, long lastModified) {
this(bytes, 0, bytes.length, lastModified);
}
public MCRByteContent(byte[] bytes, int offset, int length, long lastModified) {
this.bytes = bytes;
this.offset = offset;
this.length = length;
this.lastModified = lastModified;
}
@Override
public void setSystemId(String systemId) {
this.systemId = systemId;
}
@Override
public InputStream getInputStream() {
return new ByteArrayInputStream(bytes, offset, length);
}
@Override
public byte[] asByteArray() {
if (offset == 0 && length == 0) {
return bytes;
}
synchronized (this) {
if (offset == 0 && length == bytes.length) {
return bytes;
}
bytes = Arrays.copyOfRange(bytes, offset, offset + length);
offset = 0;
length = bytes.length;
}
return bytes;
}
@Override
public long length() {
return length;
}
@Override
public long lastModified() {
return lastModified;
}
@Override
public String getETag() {
MessageDigest md5Digest = MCRMD5InputStream.buildMD5Digest();
md5Digest.update(bytes, offset, length);
byte[] digest = md5Digest.digest();
String md5String = MCRMD5InputStream.getMD5String(digest);
return '"' + md5String + '"';
}
}