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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 java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.fop.render.afp.tools.BinaryUtils;
/**
* The Map Page Overlay structured field maps a Resource Local ID to the name of
* a Begin Overlay structured field. A Map Page Overlay structured field may
* contain from one to 254 repeating groups.
*/
public class MapPageOverlay extends AbstractAFPObject {
private static final int MAX_SIZE = 253;
/**
* The collection of overlays (maximum of 254 stored as byte[])
*/
private List overLays = null;
/**
* Constructor for the Map Page Overlay
*/
public MapPageOverlay() {
}
private List getOverlays() {
if (overLays == null) {
this.overLays = new java.util.ArrayList();
}
return this.overLays;
}
/**
* Add an overlay to to the map page overlay object.
*
* @param name
* The name of the overlay.
* @throws MaximumSizeExceededException if the maximum size is reached
*/
public void addOverlay(String name) throws MaximumSizeExceededException {
if (getOverlays().size() > MAX_SIZE) {
throw new MaximumSizeExceededException();
}
if (name.length() != 8) {
throw new IllegalArgumentException("The name of overlay " + name
+ " must be 8 characters");
}
if (log.isDebugEnabled()) {
log.debug("addOverlay():: adding overlay " + name);
}
try {
byte[] data = name.getBytes(AFPConstants.EBCIDIC_ENCODING);
getOverlays().add(data);
} catch (UnsupportedEncodingException usee) {
log.error("addOverlay():: UnsupportedEncodingException translating the name "
+ name);
}
}
/**
* Accessor method to write the AFP datastream for the Map Page Overlay
* @param os The stream to write to
* @throws java.io.IOException if an I/O exception occurred
*/
public void write(OutputStream os) throws IOException {
int oLayCount = getOverlays().size();
int recordlength = oLayCount * 18;
byte[] data = new byte[recordlength + 9];
data[0] = 0x5A;
// Set the total record length
byte[] rl1 = BinaryUtils.convert(recordlength + 8, 2); //Ignore the
// first byte in
// the length
data[1] = rl1[0];
data[2] = rl1[1];
// Structured field ID for a MPO
data[3] = (byte) 0xD3;
data[4] = (byte) 0xAB;
data[5] = (byte) 0xD8;
data[6] = 0x00; // Reserved
data[7] = 0x00; // Reserved
data[8] = 0x00; // Reserved
int pos = 8;
//For each overlay
byte olayref = 0x00;
for (int i = 0; i < oLayCount; i++) {
olayref = (byte) (olayref + 1);
data[++pos] = 0x00;
data[++pos] = 0x12; //the length of repeating group
data[++pos] = 0x0C; //Fully Qualified Name
data[++pos] = 0x02;
data[++pos] = (byte) 0x84;
data[++pos] = 0x00;
//now add the name
byte[] name = (byte[]) overLays.get(i);
for (int j = 0; j < name.length; j++) {
data[++pos] = name[j];
}
data[++pos] = 0x04; //Resource Local Identifier (RLI)
data[++pos] = 0x24;
data[++pos] = 0x02;
//now add the unique id to the RLI
data[++pos] = olayref;
}
os.write(data);
}
}
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