net.sf.jsefa.xml.namespace.QNameParser Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jsefa-android Show documentation

JSefa (Java Simple exchange format api) is a simple library for stream-based serialization of java objects to XML, CSV, FLR or any other format and back again using an iterator-style interface independent of the serialization format. The mapping between java object types and types of the serialization format (e. g. xml complex element types) can be defined either by annotating the java classes or programmatically using a simple API. The current implementation supports XML, CSV and FLR - for XML it is based on JSR 173.

The newest version!

/*
 * Copyright 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 net.sf.jsefa.xml.namespace;

/**
 * A QNameParser allows for creating a {@link QName} from its String representation.
 * 
 * The format is prefix:localname

 * if an explicit prefix is given and localname if no explicit prefix is given.
 * 
 * @author Norman Lahme-Huetig
 * 
 */
public final class QNameParser {
    /**
     * Creates a {@link QName} from a String representation using the given namespace manager for
     * namespace prefix resolving.
     * 
     * In the case the String representation contains no prefix it is assumed that the name belongs
     * to the default namespace only if the argument forElement is true and if a default namespace
     * is registered.
     * 
     * @param name the String representation of the QName as desribed above
     * @param forElement true, if a default namespace should be taken into account; false otherwise.
     * @param namespaceManager the namespace manager used to retrieve the URI for a given prefix
     * @return the QName
     */
    public static QName parse(String name, boolean forElement, NamespaceManager namespaceManager) {
        if (name == null) {
            throw new NullPointerException("Argument name must not be null");
        } else if (name.length() == 0) {
            throw new IllegalArgumentException("Argument name must not be an empty string");
        }
        int delimiterPos = name.indexOf(":");
        if (delimiterPos == -1) {
            if (forElement) {
                String defaultNamespaceURI = namespaceManager.getUri(NamespaceConstants.DEFAULT_NAMESPACE_PREFIX);
                if (defaultNamespaceURI != null) {
                    return QName.create(defaultNamespaceURI, name);
                }
            }
            return QName.create(NamespaceConstants.NO_NAMESPACE_URI, name);
        } else {
            String prefix = name.substring(0, delimiterPos);
            String uri = namespaceManager.getUri(prefix);
            if (uri == null) {
                throw new IllegalArgumentException("Undeclared namespace prefix: " + prefix);
            }
            String localName = "";
            if (delimiterPos < name.length() - 1) {
                localName = name.substring(delimiterPos + 1);
            } else {
                throw new IllegalArgumentException("Invalid QName representation: " + name);
            }
            return QName.create(uri, localName);
        }

    }

    private QNameParser() {

    }
}