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Apache Solr Solrj
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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.apache.solr.common.util;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.util.Locale;

/**
 * Three concrete implementations for ContentStream - one for File/URL/String
 * 
 *
 * @since solr 1.2
 */
public abstract class ContentStreamBase implements ContentStream
{
  public static final String DEFAULT_CHARSET = StandardCharsets.UTF_8.name();
  
  protected String name;
  protected String sourceInfo;
  protected String contentType;
  protected Long size;
  
  //---------------------------------------------------------------------
  //---------------------------------------------------------------------
  
  public static String getCharsetFromContentType( String contentType )
  {
    if( contentType != null ) {
      int idx = contentType.toLowerCase(Locale.ROOT).indexOf( "charset=" );
      if( idx > 0 ) {
        return contentType.substring( idx + "charset=".length() ).trim();
      }
    }
    return null;
  }
  
  //------------------------------------------------------------------------
  //------------------------------------------------------------------------
  
  /**
   * Construct a ContentStream from a URL
   * 
   * This uses a URLConnection to get the content stream
   * @see  URLConnection
   */
  public static class URLStream extends ContentStreamBase
  {
    private final URL url;
    
    public URLStream( URL url ) {
      this.url = url; 
      sourceInfo = "url";
    }

    @Override
    public InputStream getStream() throws IOException {
      URLConnection conn = this.url.openConnection();
      
      contentType = conn.getContentType();
      name = url.toExternalForm();
      size = new Long( conn.getContentLength() );
      return conn.getInputStream();
    }
  }
  
  /**
   * Construct a ContentStream from a File
   */
  public static class FileStream extends ContentStreamBase
  {
    private final File file;
    
    public FileStream( File f ) {
      file = f; 
      
      contentType = null; // ??
      name = file.getName();
      size = file.length();
      sourceInfo = file.toURI().toString();
    }

    @Override
    public String getContentType() {
      if(contentType==null) {
        // TODO: this is buggy... does not allow for whitespace, JSON comments, etc.
        InputStream stream = null;
        try {
          stream = new FileInputStream(file);
          char first = (char)stream.read();
          if(first == '<') {
            return "application/xml";
          }
          if(first == '{') {
            return "application/json";
          }
        } catch(Exception ex) {
        } finally {
          if (stream != null) try {
            stream.close();
          } catch (IOException ioe) {}
        }
      }
      return contentType;
    }

    @Override
    public InputStream getStream() throws IOException {
      return new FileInputStream( file );
    }
  }
  

  /**
   * Construct a ContentStream from a String
   */
  public static class StringStream extends ContentStreamBase
  {
    private final String str;

    public StringStream( String str ) {
      this(str, detect(str));
    }

    public StringStream( String str, String contentType ) {
      this.str = str;
      this.contentType = contentType;
      name = null;
      try {
        size = new Long( str.getBytes(DEFAULT_CHARSET).length );
      } catch (UnsupportedEncodingException e) {
        // won't happen
        throw new RuntimeException(e);
      }
      sourceInfo = "string";
    }

    public static String detect(String str) {
      String detectedContentType = null;
      int lim = str.length() - 1;
      for (int i=0; iContentStream from a File
   */
  public static class ByteArrayStream extends ContentStreamBase
  {
    private final byte[] bytes;
    
    public ByteArrayStream( byte[] bytes, String source ) {
      this.bytes = bytes; 
      
      this.contentType = null;
      name = source;
      size = new Long(bytes.length);
      sourceInfo = source;
    }


    @Override
    public InputStream getStream() throws IOException {
      return new ByteArrayInputStream( bytes );
    }
  }  
}