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 * 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
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
package org.apache.axiom.core;

 * {@link AttributeMatcher} that matches {@link CoreNamespaceDeclaration} attributes based on the
 * declared prefix. Parameters are defined as follows:
 * <dl>
 * <dt><code>namespaceURI</code>
 * <dd>Not used.
 * <dt><code>name</code>
 * <dd>The prefix declared by the namespace declaration, or the empty string for the default
 * namespace declaration.
 * <dt><code>value</code>
 * <dd>The namespace URI of the namespace declaration.
 * <dt><code>prefix</code>
 * <dd>Not used.
 * </dl>
public final class NamespaceDeclarationMatcher implements AttributeMatcher {
    private final Semantics semantics;
    public NamespaceDeclarationMatcher(Semantics semantics) {
        this.semantics = semantics;

    public boolean matches(CoreAttribute attr, String namespaceURI, String name) {
        if (attr instanceof CoreNamespaceDeclaration) {
            String prefix = ((CoreNamespaceDeclaration)attr).coreGetDeclaredPrefix();
            return name.equals(prefix);
        } else {
            return false;

    public CoreAttribute createAttribute(CoreElement element, String namespaceURI, String name, String prefix, String value) {
        CoreNamespaceDeclaration decl = element.coreCreateNode(CoreNamespaceDeclaration.class);
        decl.coreSetDeclaredNamespace(name, value);
        return decl;

    public String getNamespaceURI(CoreAttribute attr) {
        return null;

    public String getName(CoreAttribute attr) {
        return ((CoreNamespaceDeclaration)attr).coreGetDeclaredPrefix();

    public void update(CoreAttribute attr, String prefix, String value) {
        attr.coreSetCharacterData(value, semantics);