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/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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 groovy.xml;

/**
 * A simple helper class which acts as a factory of {@link QName} instances.
 * 
 * @version $Revision$
 */
public class Namespace {

    private String uri;
    private String prefix;

    public Namespace() {
    }

    public Namespace(String uri) {
        this.uri = uri.trim();
    }

    public Namespace(String uri, String prefix) {
        this.uri = uri.trim();
        this.prefix = prefix.trim();
    }

    /**
     * Returns the QName for the given localName.
     * 
     * @param localName
     *            the local name within this
     */
    public QName get(String localName) {
        if (uri != null && uri.length() > 0) {
            if (prefix != null) {
                return new QName(uri, localName, prefix);
            }
            else {
                return new QName(uri, localName);
            }
        }
        else {
            return new QName(localName);
        }
    }

    /**
     * Returns the prefix mapped to this namespace
     * 
     * @return the prefix assigned to this namespace or null if no namespace is
     *         mapped.
     */
    public String getPrefix() {
        return prefix;
    }

    /**
     * Returns the URI of this namespace
     * 
     * @return the URI of this namespace
     */
    public String getUri() {
        return uri;
    }

}