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/*
* $Id: PageSequenceMaster.java,v 1.13 2003/03/06 13:42:42 jeremias Exp $
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.fo.pagination;
// Java
import java.util.List;
// SAX
import org.xml.sax.Attributes;
// FOP
import org.apache.fop.fo.Constants;
import org.apache.fop.fo.FONode;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.FOTreeVisitor;
import org.apache.fop.apps.FOPException;
/**
* 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 {
private LayoutMasterSet layoutMasterSet;
private List subSequenceSpecifiers;
private SubSequenceSpecifier currentSubSequence;
private int currentSubSequenceNumber;
private String masterName;
// 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.FONode#handleAttrs(Attributes)
*/
public void handleAttrs(Attributes attlist) throws FOPException {
super.handleAttrs(attlist);
subSequenceSpecifiers = new java.util.ArrayList();
if (parent.getName().equals("fo:layout-master-set")) {
this.layoutMasterSet = (LayoutMasterSet)parent;
String pm = this.propertyList.get(Constants.PR_MASTER_NAME).getString();
if (pm == null) {
getLogger().warn("page-sequence-master does not have "
+ "a master-name and so is being ignored");
} else {
this.layoutMasterSet.addPageSequenceMaster(pm, this);
}
} else {
throw new FOPException("fo:page-sequence-master must be child "
+ "of fo:layout-master-set, not "
+ parent.getName());
}
}
/**
* 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();
}
}
/**
* 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
+ "', use 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;
}
public void acceptVisitor(FOTreeVisitor fotv) {
fotv.servePageSequenceMaster(this);
}
}
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