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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* $Id$ */
package org.apache.fop.render.afp.modca;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.fop.render.afp.AFPConstants;
import org.apache.fop.render.afp.tools.BinaryUtils;
/**
* The No Operation structured field may be used to carry comments
* or any other type of unarchitected data. Although not recommended,
* it may also be used to carry semantic data in private or exchange data
* streams. However, because receivers of interchange data streams should
* ignore the content of No Operation structured fields and because
* receiver-generator products are not required to propagate
* No Operation structured fields, no semantics should be attached to
* the data carried by the No Operation structured field in interchange
*/
public class NoOperation extends AbstractAFPObject {
/** Up to 32759 bytes of data with no architectural definition */
private static final int MAX_DATA_LEN = 32759;
/**
* Byte representation of the comment
*/
private String content;
/**
* Construct a tag logical element with the name and value specified.
*
* @param content the content to record
*/
public NoOperation(String content) {
this.content = content;
}
/**
* Accessor method to obtain the byte array AFP datastream for the
* NoOperation.
*
* @param os The outputsteam stream
* @throws java.io.IOException if an I/O exception occurs during processing
*/
public void write(OutputStream os) throws IOException {
byte[] contentData = content.getBytes(AFPConstants.EBCIDIC_ENCODING);
int contentLen = contentData.length;
// packet maximum of 32759 bytes
if (contentLen > MAX_DATA_LEN) {
contentLen = MAX_DATA_LEN;
}
byte[] data = new byte[9 + contentLen];
data[0] = 0x5A;
// Set the total record length
byte[] rl1 = BinaryUtils.convert(8 + contentLen, 2);
//Ignore first byte
data[1] = rl1[0];
data[2] = rl1[1];
// Structured field ID for a TLE
data[3] = (byte) 0xD3;
data[4] = (byte) 0xEE;
data[5] = (byte) 0xEE;
data[6] = 0x00; // Reserved
data[7] = 0x00; // Reserved
data[8] = 0x00; // Reserved
int pos = 9;
for (int i = 0; i < contentLen; i++) {
data[pos++] = contentData[i];
}
os.write(data);
}
}
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