/*

  * Copyright 2007-2008 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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.kuali.rice.core.api.impex.xml;

 import java.io.ByteArrayInputStream;

 import java.io.ByteArrayOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.OutputStream;

 /**

  * Stream-based XML doc

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class StreamXmlDoc extends BaseXmlDoc {

         private byte[] bytes;

         private InputStream stream;

         public StreamXmlDoc(InputStream stream, XmlDocCollection collection) {

                 super(collection);

                 this.stream = stream;

         }

         public synchronized InputStream getStream() throws IOException {

                 // this sucks, but does it suck less than copying the file?

                 // or dealing with concurrency issues on a surveilling input stream

                 if (bytes == null) {

                         bytes = StreamXmlDoc.toByteArray(stream);

                 }

                 return new ByteArrayInputStream(bytes);

         }

         public String getName() {

                 return stream.toString();

         }

         /**

          * The following code copied from commons-io IOUtils to avoid a core-api dependency on that library.

          */

         private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;

         private static byte[] toByteArray(InputStream input) throws IOException {

                 ByteArrayOutputStream output = new ByteArrayOutputStream();

                 copy(input, output);

                 return output.toByteArray();

         }

         private static int copy(InputStream input, OutputStream output)

                         throws IOException {

                 long count = copyLarge(input, output);

                 if (count > Integer.MAX_VALUE) {

                         return -1;

                 }

                 return (int) count;

         }

         public static long copyLarge(InputStream input, OutputStream output)

                         throws IOException {

                 byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];

                 long count = 0;

                 int n = 0;

                 while (-1 != (n = input.read(buffer))) {

                         output.write(buffer, 0, n);

                         count += n;

                 }

                 return count;

         }

         /**

          * End code copied from common-io IOUtils

          */

 }