/*
 * 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.servicemix.maven.plugin.jbi;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.xml.namespace.QName;

import org.apache.servicemix.common.packaging.Consumes;
import org.apache.servicemix.common.packaging.Provides;
import org.codehaus.plexus.util.xml.XMLWriter;

public class AbstractDescriptorWriter {

    protected void addStringAttribute(XMLWriter writer, String attributeName,
            String attributeValue) {
        if (attributeValue != null) {
            writer.addAttribute(attributeName, attributeValue);
        }
    }

    protected void addQNameAttribute(XMLWriter writer, String attributeName,
            QName attributeValue, Map namespaceMap) {
        if (attributeValue != null) {
            StringBuffer attributeStringValue = new StringBuffer();
            attributeStringValue.append(namespaceMap.get(attributeValue
                    .getNamespaceURI()));
            attributeStringValue.append(":");
            attributeStringValue.append(attributeValue.getLocalPart());
            writer.addAttribute(attributeName, attributeStringValue.toString());
        }

    }

    protected Map getNamespaceMap(List provides, List consumes) {
        Map namespaceMap = new HashMap();
        int namespaceCounter = 1;
        for (Iterator iterator = provides.iterator(); iterator.hasNext();) {
            Provides providesEntry = (Provides) iterator.next();
            namespaceCounter = resolveMapEntry(namespaceMap, providesEntry
                    .getInterfaceName(), namespaceCounter);
            namespaceCounter = resolveMapEntry(namespaceMap, providesEntry
                    .getServiceName(), namespaceCounter);
        }

        for (Iterator iterator = consumes.iterator(); iterator.hasNext();) {
            Consumes consumesEntry = (Consumes) iterator.next();
            namespaceCounter = resolveMapEntry(namespaceMap, consumesEntry
                    .getInterfaceName(), namespaceCounter);
            namespaceCounter = resolveMapEntry(namespaceMap, consumesEntry
                    .getServiceName(), namespaceCounter);
        }

        return namespaceMap;
    }

    private int resolveMapEntry(Map namespaceMap, QName qname,
            int namespaceCounter) {
        if ((qname != null)
                && (!namespaceMap.containsKey(qname.getNamespaceURI()))) {
            if (qname.getPrefix() == null || qname.getPrefix().equals("")) {
                namespaceMap.put(qname.getNamespaceURI(), "ns"
                        + namespaceCounter++);
            } else {
                namespaceMap.put(qname.getNamespaceURI(), qname.getPrefix());
            }
        }
        return namespaceCounter;
    }

}