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The default implementation of the Axiom API.
/*
* 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;
}
}
}
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