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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.util.ArrayList;
import java.util.List;
/**
* A Resource Group contains a set of overlays.
*/
public final class ResourceGroup extends AbstractNamedAFPObject {
/**
* Default name for the resource group
*/
private static final String DEFAULT_NAME = "RG000001";
/**
* The overlays contained in this resource group
*/
private List overlays = new ArrayList();
/**
* Default constructor
*/
public ResourceGroup() {
this(DEFAULT_NAME);
}
/**
* Constructor for the ResourceGroup, this takes a
* name parameter which must be 8 characters long.
* @param name the resource group name
*/
public ResourceGroup(String name) {
super(name);
}
/**
* Adds an overlay to the resource group
* @param overlay the overlay to add
*/
public void addOverlay(Overlay overlay) {
overlays.add(overlay);
}
/**
* Returns the list of overlays
* @return the list of overlays
*/
public List getOverlays() {
return overlays;
}
/**
* Accessor method to obtain write the AFP datastream for
* the resource group.
* @param os The stream to write to
* @throws java.io.IOException if an I/O exception of some sort has occurred
*/
public void writeDataStream(OutputStream os)
throws IOException {
writeStart(os);
writeObjectList(overlays, os);
writeEnd(os);
}
/**
* Helper method to write the start of the resource group.
* @param os The stream to write to
*/
private void writeStart(OutputStream os)
throws IOException {
byte[] data = new byte[17];
data[0] = 0x5A; // Structured field identifier
data[1] = 0x00; // Length byte 1
data[2] = 0x10; // Length byte 2
data[3] = (byte) 0xD3; // Structured field id byte 1
data[4] = (byte) 0xA8; // Structured field id byte 2
data[5] = (byte) 0xC6; // Structured field id byte 3
data[6] = 0x00; // Flags
data[7] = 0x00; // Reserved
data[8] = 0x00; // Reserved
for (int i = 0; i < nameBytes.length; i++) {
data[9 + i] = nameBytes[i];
}
os.write(data);
}
/**
* Helper method to write the end of the resource group.
* @param os The stream to write to
*/
private void writeEnd(OutputStream os)
throws IOException {
byte[] data = new byte[17];
data[0] = 0x5A; // Structured field identifier
data[1] = 0x00; // Length byte 1
data[2] = 0x10; // Length byte 2
data[3] = (byte) 0xD3; // Structured field id byte 1
data[4] = (byte) 0xA9; // Structured field id byte 2
data[5] = (byte) 0xC6; // Structured field id byte 3
data[6] = 0x00; // Flags
data[7] = 0x00; // Reserved
data[8] = 0x00; // Reserved
for (int i = 0; i < nameBytes.length; i++) {
data[9 + i] = nameBytes[i];
}
os.write(data);
}
}
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