org.jclouds.aws.ec2.xml.DescribeInternetGatewaysResponseHandler.java Source code

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Here is the source code for org.jclouds.aws.ec2.xml.DescribeInternetGatewaysResponseHandler.java

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/*
 * 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 static org.jclouds.util.SaxUtils.equalsOrSuffix;

import org.jclouds.aws.ec2.domain.InternetGateway;
import org.jclouds.http.functions.ParseSax;
import org.xml.sax.Attributes;

import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSet.Builder;
import com.google.inject.Inject;

/**
 * @see <a href="http://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeVpcs.html">xml</a>
 */
public class DescribeInternetGatewaysResponseHandler
        extends ParseSax.HandlerForGeneratedRequestWithResult<FluentIterable<InternetGateway>> {
    private final InternetGatewayHandler gatewayHandler;
    private boolean inAttachmentSet;
    private boolean inTagSet;
    private Builder<InternetGateway> gateways = ImmutableSet.builder();

    @Inject
    DescribeInternetGatewaysResponseHandler(InternetGatewayHandler gatewayHandler) {
        this.gatewayHandler = gatewayHandler;
    }

    @Override
    public FluentIterable<InternetGateway> getResult() {
        try {
            return FluentIterable.from(gateways.build());
        } finally {
            gateways = ImmutableSet.builder();
        }
    }

    @Override
    public void startElement(String url, String name, String qName, Attributes attributes) {
        if (equalsOrSuffix(qName, "attachmentSet")) {
            inAttachmentSet = true;
        } else if (equalsOrSuffix(qName, "tagSet")) {
            inTagSet = true;
        }
        gatewayHandler.startElement(url, name, qName, attributes);
    }

    @Override
    public void endElement(String uri, String name, String qName) {
        if (equalsOrSuffix(qName, "attachmentSet")) {
            inAttachmentSet = false;
            gatewayHandler.endElement(uri, name, qName);
        } else if (equalsOrSuffix(qName, "tagSet")) {
            inTagSet = false;
            gatewayHandler.endElement(uri, name, qName);
        } else if (equalsOrSuffix(qName, "item") && !inTagSet && !inAttachmentSet) {
            gateways.add(gatewayHandler.getResult());
        } else {
            gatewayHandler.endElement(uri, name, qName);
        }
    }

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

}