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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.afp.modca;
-
- import java.io.IOException;
- import java.io.OutputStream;
- import java.io.UnsupportedEncodingException;
- import java.util.List;
-
- import org.apache.fop.afp.AFPConstants;
- import org.apache.fop.afp.util.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;
-
- /**
- * 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);
- }
- }
-
- /** {@inheritDoc} */
- public void writeToStream(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] = Type.MAP;
- data[5] = Category.PAGE_OVERLAY;
-
- 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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