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/*
* Copyright 1999-2005 The Apache Software Foundation.
*
* Licensed 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.fo.pagination;
// Java
import java.util.List;
import org.xml.sax.Locator;
import org.apache.fop.apps.FOPException;
import org.apache.fop.fo.FONode;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.ValidationException;
/**
* The page-sequence-master formatting object.
* This class handles a list of subsequence specifiers
* which are simple or complex references to page-masters.
*/
public class PageSequenceMaster extends FObj {
// The value of properties relevant for fo:page-sequence-master.
private String masterName;
// End of property values
private LayoutMasterSet layoutMasterSet;
private List subSequenceSpecifiers;
private SubSequenceSpecifier currentSubSequence;
private int currentSubSequenceNumber;
// The terminology may be confusing. A 'page-sequence-master' consists
// of a sequence of what the XSL spec refers to as
// 'sub-sequence-specifiers'. These are, in fact, simple or complex
// references to page-masters. So the methods use the former
// terminology ('sub-sequence-specifiers', or SSS),
// but the actual FO's are MasterReferences.
/**
* @see org.apache.fop.fo.FONode#FONode(FONode)
*/
public PageSequenceMaster(FONode parent) {
super(parent);
}
/**
* @see org.apache.fop.fo.FObj#bind(PropertyList)
*/
public void bind(PropertyList pList) throws FOPException {
masterName = pList.get(PR_MASTER_NAME).getString();
if (masterName == null || masterName.equals("")) {
missingPropertyError("master-name");
}
}
/**
* @see org.apache.fop.fo.FONode#startOfNode()
*/
protected void startOfNode() throws FOPException {
subSequenceSpecifiers = new java.util.ArrayList();
layoutMasterSet = parent.getRoot().getLayoutMasterSet();
layoutMasterSet.addPageSequenceMaster(masterName, this);
}
/**
* @see org.apache.fop.fo.FONode#endOfNode()
*/
protected void endOfNode() throws FOPException {
if (childNodes == null) {
missingChildElementError("(single-page-master-reference|"
+ "repeatable-page-master-reference|repeatable-page-master-alternatives)+");
}
}
/**
* @see org.apache.fop.fo.FONode#validateChildNode(Locator, String, String)
* XSL/FOP: (single-page-master-reference|repeatable-page-master-reference|
* repeatable-page-master-alternatives)+
*/
protected void validateChildNode(Locator loc, String nsURI, String localName)
throws ValidationException {
if (nsURI == FO_URI) {
if (!localName.equals("single-page-master-reference")
&& !localName.equals("repeatable-page-master-reference")
&& !localName.equals("repeatable-page-master-alternatives")) {
invalidChildError(loc, nsURI, localName);
}
} else {
invalidChildError(loc, nsURI, localName);
}
}
/**
* Adds a new suqsequence specifier to the page sequence master.
* @param pageMasterReference the subsequence to add
*/
protected void addSubsequenceSpecifier(SubSequenceSpecifier pageMasterReference) {
subSequenceSpecifiers.add(pageMasterReference);
}
/**
* Returns the next subsequence specifier
* @return a subsequence specifier
*/
private SubSequenceSpecifier getNextSubSequence() {
currentSubSequenceNumber++;
if (currentSubSequenceNumber >= 0
&& currentSubSequenceNumber < subSequenceSpecifiers.size()) {
return (SubSequenceSpecifier)subSequenceSpecifiers
.get(currentSubSequenceNumber);
}
return null;
}
/**
* Resets the subsequence specifiers subsystem.
*/
public void reset() {
currentSubSequenceNumber = -1;
currentSubSequence = null;
for (int i = 0; i < subSequenceSpecifiers.size(); i++) {
((SubSequenceSpecifier)subSequenceSpecifiers.get(i)).reset();
}
}
/**
* Used to set the "cursor position" for the page masters to the previous item.
* @return true if there is a previous item, false if the current one was the first one.
*/
public boolean goToPreviousSimplePageMaster() {
if (currentSubSequence != null) {
boolean success = currentSubSequence.goToPrevious();
if (!success) {
if (currentSubSequenceNumber > 0) {
currentSubSequenceNumber--;
currentSubSequence = (SubSequenceSpecifier)subSequenceSpecifiers
.get(currentSubSequenceNumber);
} else {
currentSubSequence = null;
}
}
}
return (currentSubSequence != null);
}
/**
* Returns the next simple-page-master.
* @param isOddPage True if the next page number is odd
* @param isFirstPage True if the next page is the first
* @param isBlankPage True if the next page is blank
* @return the requested page master
* @throws FOPException if there's a problem determining the next page master
*/
public SimplePageMaster getNextSimplePageMaster(boolean isOddPage,
boolean isFirstPage,
boolean isBlankPage)
throws FOPException {
if (currentSubSequence == null) {
currentSubSequence = getNextSubSequence();
if (currentSubSequence == null) {
throw new FOPException("no subsequences in page-sequence-master '"
+ masterName + "'");
}
}
String pageMasterName = currentSubSequence
.getNextPageMasterName(isOddPage, isFirstPage, isBlankPage);
boolean canRecover = true;
while (pageMasterName == null) {
SubSequenceSpecifier nextSubSequence = getNextSubSequence();
if (nextSubSequence == null) {
if (!canRecover) {
throw new FOPException("subsequences exhausted in page-sequence-master '"
+ masterName
+ "', cannot recover");
}
getLogger().warn("subsequences exhausted in page-sequence-master '"
+ masterName
+ "', using previous subsequence");
currentSubSequence.reset();
canRecover = false;
} else {
currentSubSequence = nextSubSequence;
}
pageMasterName = currentSubSequence
.getNextPageMasterName(isOddPage, isFirstPage, isBlankPage);
}
SimplePageMaster pageMaster = this.layoutMasterSet
.getSimplePageMaster(pageMasterName);
if (pageMaster == null) {
throw new FOPException("No simple-page-master matching '"
+ pageMasterName + "' in page-sequence-master '"
+ masterName + "'");
}
return pageMaster;
}
/**
* @see org.apache.fop.fo.FObj#getName()
*/
public String getName() {
return "fo:page-sequence-master";
}
/**
* @see org.apache.fop.fo.FObj#getNameId()
*/
public int getNameId() {
return FO_PAGE_SEQUENCE_MASTER;
}
}
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