| /************************************************************** |
| * |
| * 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. |
| * |
| *************************************************************/ |
| |
| package org.apache.openoffice.ooxml.schema.iterator; |
| |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.Queue; |
| import java.util.Set; |
| import java.util.TreeSet; |
| |
| import org.apache.openoffice.ooxml.schema.model.attribute.Attribute; |
| import org.apache.openoffice.ooxml.schema.model.attribute.AttributeGroup; |
| import org.apache.openoffice.ooxml.schema.model.attribute.AttributeGroupReference; |
| import org.apache.openoffice.ooxml.schema.model.attribute.AttributeReference; |
| import org.apache.openoffice.ooxml.schema.model.base.INode; |
| import org.apache.openoffice.ooxml.schema.model.base.INodeVisitor; |
| import org.apache.openoffice.ooxml.schema.model.base.NodeVisitorAdapter; |
| import org.apache.openoffice.ooxml.schema.model.schema.SchemaBase; |
| |
| /** Iterate over all attributes of a given node. |
| * References to attributes and attribute groups and their references are resolved. |
| * |
| * If you want to iterate over all attributes in a node tree then add an outer NodeIterator. |
| */ |
| public class AttributeIterator |
| implements Iterable<Attribute> |
| { |
| public AttributeIterator ( |
| final INode aNode, |
| final SchemaBase aSchemaBase) |
| { |
| maAttributes = new TreeSet<Attribute>(); |
| CollectAttributes(aNode, aSchemaBase); |
| } |
| |
| |
| |
| |
| public Iterator<Attribute> iterator () |
| { |
| return maAttributes.iterator(); |
| } |
| |
| |
| |
| |
| private void CollectAttributes ( |
| final INode aType, |
| final SchemaBase aSchemaBase) |
| { |
| final Queue<INode> aTodo = new LinkedList<>(); |
| for (final INode aAttribute : aType.GetAttributes()) |
| aTodo.add(aAttribute); |
| final INodeVisitor aVisitor = new NodeVisitorAdapter() |
| { |
| @Override public void Visit (final Attribute aAttribute) |
| { |
| maAttributes.add(aAttribute); |
| } |
| @Override public void Visit (final AttributeReference aAttributeReference) |
| { |
| aTodo.add(aAttributeReference.GetReferencedAttribute(aSchemaBase)); |
| } |
| @Override public void Visit (final AttributeGroup aAttributeGroup) |
| { |
| for (final INode aGroupAttribute : aAttributeGroup.GetAttributes()) |
| aTodo.add(aGroupAttribute); |
| } |
| @Override public void Visit (final AttributeGroupReference aAttributeGroupReference) |
| { |
| aTodo.add(aAttributeGroupReference.GetReferencedAttributeGroup(aSchemaBase)); |
| } |
| @Override public void Default (final INode aNode) |
| { |
| throw new RuntimeException("can not handle attribute of type "+aNode.GetNodeType()); |
| } |
| }; |
| while ( ! aTodo.isEmpty()) |
| { |
| final INode aAttribute = aTodo.poll(); |
| if (aAttribute != null) |
| aAttribute.AcceptVisitor(aVisitor); |
| } |
| } |
| |
| |
| |
| |
| private final Set<Attribute> maAttributes; |
| } |