/*

  * 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.any23.source;

 import org.apache.any23.http.HTTPClient;

 import java.io.IOException;

 import java.io.InputStream;

 import java.net.URI;

 import java.net.URISyntaxException;

 /**

  * Http implementation of {@link DocumentSource}.

  */

 public class HTTPDocumentSource implements DocumentSource {

     private final HTTPClient client;

     private String uri;

     private InputStream unusedInputStream = null;

     private boolean loaded = false;

     public HTTPDocumentSource(HTTPClient client, String uri) throws URISyntaxException {

         this.client = client;

         this.uri = normalize(uri);

     }

     private String normalize(String uri) throws URISyntaxException {

         return new URI(uri).normalize().toString();

     }

     private void ensureOpen() throws IOException {

         if (loaded) return;

         loaded = true;

         unusedInputStream = client.openInputStream(uri);

         if (client.getActualDocumentURI() != null) {

             uri = client.getActualDocumentURI();

         }

     }

     public InputStream openInputStream() throws IOException {

         ensureOpen();

         if (unusedInputStream != null) {

             InputStream temp = unusedInputStream;

             unusedInputStream = null;

             return temp;

         }

         return client.openInputStream(uri);

     }

     public long getContentLength() {

         return client.getContentLength();

     }

     public String getDocumentURI() {

         return uri;

     }

     public String getContentType() {

         return client.getContentType();

     }

     public boolean isLocal() {

         return false;

     }

 }