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/*******************************************************************************
* Copyright (c) 2002 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*******************************************************************************/
package org.eclipse.wst.xml.core.internal.contentmodel.util;
import java.util.Vector;
import org.eclipse.wst.xml.core.internal.contentmodel.CMAnyElement;
import org.eclipse.wst.xml.core.internal.contentmodel.CMAttributeDeclaration;
import org.eclipse.wst.xml.core.internal.contentmodel.CMContent;
import org.eclipse.wst.xml.core.internal.contentmodel.CMDataType;
import org.eclipse.wst.xml.core.internal.contentmodel.CMElementDeclaration;
import org.eclipse.wst.xml.core.internal.contentmodel.CMGroup;
import org.eclipse.wst.xml.core.internal.contentmodel.CMNamedNodeMap;
import org.eclipse.wst.xml.core.internal.contentmodel.CMNodeList;
/**
* This class lets you traverse a 'CM' model providing callbacks to build content.
*/
public class ContentBuilder extends CMVisitor
{
public static final int BUILD_ALL_CONTENT = 1;
public static final int BUILD_ONLY_REQUIRED_CONTENT = 2;
protected int buildPolicy = BUILD_ALL_CONTENT;
protected boolean alwaysVisit;
protected Vector visitedCMElementDeclarationList = new Vector();
public ContentBuilder()
{
}
public void setBuildPolicy(int buildPolicy)
{
this.buildPolicy = buildPolicy;
}
public int getBuildPolicy()
{
return buildPolicy;
}
protected void createAnyElementNode(CMAnyElement anyElement)
{
}
protected void createElementNodeStart(CMElementDeclaration ed)
{
}
protected void createElementNodeEnd(CMElementDeclaration ed)
{
}
protected void createTextNode(CMDataType dataType)
{
}
protected void createAttributeNode(CMAttributeDeclaration attribute)
{
}
public void visitCMElementDeclaration(CMElementDeclaration ed)
{
int forcedMin = (buildPolicy == BUILD_ALL_CONTENT || alwaysVisit) ? 1 : 0;
int min = Math.max(ed.getMinOccur(), forcedMin);
alwaysVisit = false;
if (min > 0 && !visitedCMElementDeclarationList.contains(ed))
{
visitedCMElementDeclarationList.add(ed);
for (int i = 1; i <= min; i++)
{
createElementNodeStart(ed);
// instead of calling super.visitCMElementDeclaration()
// we duplicate the code with some minor modifications
CMNamedNodeMap nodeMap = ed.getAttributes();
int size = nodeMap.getLength();
for (int j = 0; j < size; j++)
{
visitCMNode(nodeMap.item(j));
}
CMContent content = ed.getContent();
if (content != null)
{
visitCMNode(content);
}
if (ed.getContentType() == CMElementDeclaration.PCDATA)
{
CMDataType dataType = ed.getDataType();
if (dataType != null)
{
visitCMDataType(dataType);
}
}
// end duplication
createElementNodeEnd(ed);
}
int size = visitedCMElementDeclarationList.size();
visitedCMElementDeclarationList.remove(size - 1);
}
}
public void visitCMDataType(CMDataType dataType)
{
createTextNode(dataType);
}
public void visitCMGroup(CMGroup e)
{
int forcedMin = (buildPolicy == BUILD_ALL_CONTENT || alwaysVisit) ? 1 : 0;
int min = Math.max(e.getMinOccur(), forcedMin);
alwaysVisit = false;
for (int i = 1; i <= min; i++)
{
if (e.getOperator() == CMGroup.CHOICE)
{
// add only 1 element from the group
// todo... perhaps add something other than the first one
CMNodeList nodeList = e.getChildNodes();
if (nodeList.getLength() > 0)
{
visitCMNode(nodeList.item(0));
}
}
else // SEQUENCE, ALL
{
// visit all of the content
super.visitCMGroup(e);
}
}
}
public void visitCMAttributeDeclaration(CMAttributeDeclaration ad)
{
if (alwaysVisit ||
buildPolicy == BUILD_ALL_CONTENT ||
ad.getUsage() == CMAttributeDeclaration.REQUIRED)
{
createAttributeNode(ad);
}
}
public void visitCMAnyElement(CMAnyElement anyElement)
{
int forcedMin = (buildPolicy == BUILD_ALL_CONTENT || alwaysVisit) ? 1 : 0;
alwaysVisit = false;
int min = Math.max(anyElement.getMinOccur(), forcedMin);
for (int i = 1; i <= min; i++)
{
createAnyElementNode(anyElement);
}
}
}
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