| /* |
| * Copyright 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. |
| */ |
| package org.apache.ws.commons.om.util; |
| |
| import org.apache.ws.commons.om.OMElement; |
| import org.apache.ws.commons.om.OMNamespace; |
| import org.apache.ws.commons.om.OMNode; |
| |
| import javax.xml.namespace.QName; |
| import java.util.Iterator; |
| |
| /** |
| * Helper class to provide extra utility stuff against elements. |
| * The code is designed to work with any element implementation. |
| */ |
| |
| public class ElementHelper { |
| |
| private OMElement element; |
| |
| /** |
| * Constructs and binds to an element. |
| * @param element element to work with |
| */ |
| public ElementHelper(OMElement element) { |
| this.element = element; |
| } |
| |
| /** |
| * Turns a prefix:local qname string into a proper QName, evaluating it in the OMElement context. |
| * |
| * @param qname qname to resolve |
| * @param defaultToParentNameSpace flag that controls behaviour when there is no namespace. |
| * @return Returns null for any failure to extract a qname. |
| */ |
| public QName resolveQName(String qname, boolean defaultToParentNameSpace) { |
| int colon = qname.indexOf(':'); |
| if (colon < 0) { |
| if (defaultToParentNameSpace) { |
| //get the parent ns and use it for the child |
| OMNamespace namespace = element.getNamespace(); |
| return new QName(namespace.getName(), qname, namespace.getPrefix()); |
| } else { |
| //else things without no prefix are local. |
| return new QName(qname); |
| } |
| } |
| String prefix = qname.substring(0, colon); |
| String local = qname.substring(colon + 1); |
| if (local.length() == 0) { |
| //empy local, exit accordingly |
| return null; |
| } |
| |
| OMNamespace namespace = element.findNamespaceURI(prefix); |
| if (namespace == null) { |
| return null; |
| } |
| return new QName(namespace.getName(), local, prefix); |
| } |
| |
| /** |
| * Turns a prefix:local qname string into a proper QName, evaluating it in the OMElement context. |
| * Unprefixed qnames resolve to the local namespace. |
| * |
| * @param qname prefixed qname string to resolve |
| * @return Returns null for any failure to extract a qname. |
| */ |
| public QName resolveQName(String qname) { |
| return resolveQName(qname, true); |
| } |
| |
| public static void setNewElement(OMElement parent, |
| OMElement myElement, |
| OMElement newElement) { |
| if (myElement != null) { |
| myElement.discard(); |
| } |
| parent.addChild(newElement); |
| myElement = newElement; |
| } |
| |
| public static OMElement getChildWithName(OMElement parent, |
| String childName) { |
| Iterator childrenIter = parent.getChildren(); |
| while (childrenIter.hasNext()) { |
| OMNode node = (OMNode) childrenIter.next(); |
| if (node.getType() == OMNode.ELEMENT_NODE && |
| childName.equals(((OMElement) node).getLocalName())) { |
| return (OMElement) node; |
| } |
| } |
| return null; |
| } |
| } |