| /* |
| * 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.axiom.om.impl.common; |
| |
| import static org.apache.axiom.util.xml.NSUtils.generatePrefix; |
| |
| import org.apache.axiom.om.OMNamespace; |
| import org.apache.axiom.om.impl.intf.AxiomElement; |
| |
| public final class NSUtil { |
| private NSUtil() {} |
| |
| public static OMNamespace handleNamespace(AxiomElement context, OMNamespace ns, boolean attr, boolean decl) { |
| String namespaceURI = ns == null ? "" : ns.getNamespaceURI(); |
| String prefix = ns == null ? "" : ns.getPrefix(); |
| if (namespaceURI.length() == 0) { |
| if (prefix != null && prefix.length() != 0) { |
| throw new IllegalArgumentException("Cannot bind a prefix to the empty namespace name"); |
| } |
| if (!attr && decl) { |
| // Special case: no namespace; we need to generate a namespace declaration only if |
| // there is a conflicting namespace declaration (i.e. a declaration for the default |
| // namespace with a non empty URI) is in scope |
| if (context.getDefaultNamespace() != null) { |
| context.declareDefaultNamespace(""); |
| } |
| } |
| return null; |
| } else { |
| if (attr && prefix != null && prefix.length() == 0) { |
| throw new IllegalArgumentException("An attribute with a namespace must be prefixed"); |
| } |
| boolean addNSDecl = false; |
| if (context != null && (decl || prefix == null)) { |
| OMNamespace existingNSDecl = context.findNamespace(namespaceURI, prefix); |
| if (existingNSDecl == null |
| || (prefix != null && !existingNSDecl.getPrefix().equals(prefix)) |
| || (prefix == null && attr && existingNSDecl.getPrefix().length() == 0)) { |
| addNSDecl = decl; |
| } else { |
| prefix = existingNSDecl.getPrefix(); |
| ns = existingNSDecl; |
| } |
| } |
| if (prefix == null) { |
| prefix = generatePrefix(namespaceURI); |
| ns = new OMNamespaceImpl(namespaceURI, prefix); |
| } |
| if (addNSDecl) { |
| context.addNamespaceDeclaration(ns); |
| } |
| return ns; |
| } |
| } |
| } |