providers/aws-ec2/src/main/java/org/jclouds/aws/ec2/xml/DescribeTagsResponseHandler.java

/*
 * 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.jclouds.aws.ec2.xml;

import java.util.Set;

import javax.inject.Inject;

import org.jclouds.aws.ec2.domain.Tag;
import org.jclouds.http.HttpRequest;
import org.jclouds.http.functions.ParseSax;
import org.jclouds.http.functions.ParseSax.HandlerWithResult;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

import com.google.common.collect.Sets;

/**
 * @author grkvlt@apache.org
 */
public class DescribeTagsResponseHandler extends ParseSax.HandlerWithResult<Set<Tag>> {
    private Set<Tag> tags = Sets.newLinkedHashSet();
    private final TagHandler tagHandler;

    @Inject
    public DescribeTagsResponseHandler(TagHandler tagHandler) {
        this.tagHandler = tagHandler;
    }

    public Set<Tag> getResult() {
        return tags;
    }

    @Override
    public HandlerWithResult<Set<Tag>> setContext(HttpRequest request) {
        tagHandler.setContext(request);
        return super.setContext(request);
    }

    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        if (!qName.equals("item"))
            tagHandler.startElement(uri, localName, qName, attributes);
    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        if (qName.equals("item")) {
            tags.add(tagHandler.getResult());
        }
        tagHandler.endElement(uri, localName, qName);
    }

    public void characters(char ch[], int start, int length) {
        tagHandler.characters(ch, start, length);
    }
}