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/*
* Copyright 1999-2004 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.ArrayList;
import java.util.List;
// XML
import org.xml.sax.Locator;
import org.xml.sax.SAXParseException;
// FOP
import org.apache.fop.fo.FONode;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.layoutmgr.FlowLayoutManager;
/**
* Class modelling the fo:flow object.
* @todo check need for markerSnapshot, contentWidth
*/
public class Flow extends FObj {
// The value of properties relevant for fo:flow.
private String flowName;
// End of property values
/**
* ArrayList to store snapshot
*/
private ArrayList markerSnapshot;
/** used for FO validation */
private boolean blockItemFound = false;
/**
* @param parent FONode that is the parent of this object
*/
public Flow(FONode parent) {
super(parent);
}
/**
* @see org.apache.fop.fo.FObj#bind(PropertyList)
*/
public void bind(PropertyList pList) {
flowName = pList.get(PR_FLOW_NAME).getString();
}
/**
* @see org.apache.fop.fo.FONode#startOfNode
*/
protected void startOfNode() throws SAXParseException {
if (!parent.getName().equals("fo:page-sequence")) {
throw new SAXParseException("flow must be child of "
+ "page-sequence, not " + parent.getName(), locator);
}
if (flowName == null || flowName.equals("")) {
missingPropertyError("flow-name");
}
// according to communication from Paul Grosso (XSL-List,
// 001228, Number 406), confusion in spec section 6.4.5 about
// multiplicity of fo:flow in XSL 1.0 is cleared up - one (1)
// fo:flow per fo:page-sequence only.
/* if (pageSequence.isFlowSet()) {
if (this.name.equals("fo:flow")) {
throw new FOPException("Only a single fo:flow permitted"
+ " per fo:page-sequence");
} else {
throw new FOPException(this.name
+ " not allowed after fo:flow");
}
}
*/
// Now done in addChild of page-sequence
//pageSequence.addFlow(this);
getFOEventHandler().startFlow(this);
}
/**
* Make sure content model satisfied, if so then tell the
* FOEventHandler that we are at the end of the flow.
* @see org.apache.fop.fo.FONode#endOfNode
*/
protected void endOfNode() throws SAXParseException {
if (!blockItemFound) {
missingChildElementError("marker* (%block;)+");
}
getFOEventHandler().endFlow(this);
}
/**
* @see org.apache.fop.fo.FONode#validateChildNode(Locator, String, String)
* XSL Content Model: marker* (%block;)+
*/
protected void validateChildNode(Locator loc, String nsURI, String localName)
throws SAXParseException {
if (nsURI == FO_URI && localName.equals("marker")) {
if (blockItemFound) {
nodesOutOfOrderError(loc, "fo:marker", "(%block;)");
}
} else if (!isBlockItem(nsURI, localName)) {
invalidChildError(loc, nsURI, localName);
} else {
blockItemFound = true;
}
}
/**
* @return true (Flow can generate reference areas)
*/
public boolean generatesReferenceAreas() {
return true;
}
/**
* Return "flow-name" property.
*/
public String getFlowName() {
return flowName;
}
/**
* @see org.apache.fop.fo.FONode#addLayoutManager(List)
*/
public void addLayoutManager(List list) {
FlowLayoutManager lm = new FlowLayoutManager(this);
list.add(lm);
}
/**
* @see org.apache.fop.fo.FObj#getName()
*/
public String getName() {
return "fo:flow";
}
/**
* @see org.apache.fop.fo.FObj#getNameId()
*/
public int getNameId() {
return FO_FLOW;
}
}
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