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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;
/**
* Pages contain the data objects that comprise a presentation document. Each
* page has a set of data objects associated with it. Each page within a
* document is independent from any other page, and each must establish its own
* environment parameters.
*
* The page is the level in the document component hierarchy that is used for
* printing or displaying a document's content. The data objects contained in
* the page envelope in the data stream are presented when the page is
* presented. Each data object has layout information associated with it that
* directs the placement and orientation of the data on the page. In addition,
* each page contains layout information that specifies the measurement units,
* page width, and page depth.
*
* A page is initiated by a begin page structured field and terminated by an end
* page structured field. Structured fields that define objects and active
* environment groups or that specify attributes of the page may be encountered
* in page state.
*
*/
public class PageObject extends AbstractPageObject {
/**
* The resource group object
*/
private ResourceGroup resourceGroup = null;
/**
* Construct a new page object for the specified name argument, the page
* name should be an 8 character identifier.
*
* @param name
* the name of the page.
* @param width
* the width of the page.
* @param height
* the height of the page.
* @param rotation
* the rotation of the page.
* @param widthResolution
* the width resolution of the page.
* @param heightResolution
* the height resolution of the page.
*/
public PageObject(String name, int width, int height, int rotation,
int widthResolution, int heightResolution) {
super(name, width, height, rotation, widthResolution, heightResolution);
}
/**
* Adds an overlay to the page resources
* @param overlay the overlay to add
*/
public void addOverlay(Overlay overlay) {
if (resourceGroup == null) {
resourceGroup = new ResourceGroup();
}
resourceGroup.addOverlay(overlay);
}
/**
* Creates an IncludePageOverlay on the page.
*
* @param name
* the name of the overlay
* @param x
* the x position of the overlay
* @param y
* the y position of the overlay
* @param orientation
* the orientation required for the overlay
*/
public void createIncludePageOverlay(String name, int x, int y, int orientation) {
IncludePageOverlay ipo = new IncludePageOverlay(name, x, y, orientation);
objects.add(ipo);
}
/**
* Accessor method to write the AFP datastream for the page.
* @param os The stream to write to
* @throws java.io.IOException thrown if an I/O exception of some sort has occurred
*/
public void writeDataStream(OutputStream os)
throws IOException {
writeStart(os);
if (resourceGroup != null) {
resourceGroup.writeDataStream(os);
}
activeEnvironmentGroup.writeDataStream(os);
writeObjectList(segments, os);
writeObjectList(tagLogicalElements, os);
writeObjectList(objects, os);
writeEnd(os);
}
/**
* Helper method to write the start of the page.
* @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) 0xAF; // 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 page.
* @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) 0xAF; // 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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