package it.unimi.dsi.mg4j.document;
/*
* MG4J: Managing Gigabytes for Java
*
* Copyright (C) 2006-2010 Sebastiano Vigna
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
import it.unimi.dsi.fastutil.objects.Reference2ObjectMap;
import it.unimi.dsi.io.FastBufferedReader;
import it.unimi.dsi.io.NullReader;
import it.unimi.dsi.io.WordReader;
import it.unimi.dsi.mg4j.document.AbstractDocument;
import it.unimi.dsi.mg4j.document.Document;
import it.unimi.dsi.mg4j.document.PropertyBasedDocumentFactory;
import it.unimi.dsi.util.Properties;
import java.io.CharArrayReader;
import java.io.IOException;
import java.io.InputStream;
/** A factory (with a single text field named <samp>text</samp>) that reads the first byte
* in the input stream and returns it as a character.
*/
@SuppressWarnings("unused")
public class FirstByteDocumentFactory extends PropertyBasedDocumentFactory {
private static final long serialVersionUID = 1L;
public FirstByteDocumentFactory() {}
public FirstByteDocumentFactory( final Reference2ObjectMap<Enum<?>,Object> defaultMetadata ) {}
public FirstByteDocumentFactory( final Properties properties ) {}
public FirstByteDocumentFactory( final String[] property ) {}
public FirstByteDocumentFactory copy() {
return this;
}
public int numberOfFields() {
return 1;
}
public String fieldName( final int field ) {
if ( field != 0 ) throw new IndexOutOfBoundsException();
return "text";
}
public int fieldIndex( final String fieldName ) {
return fieldName.equals( "text" ) ? 0: -1;
}
public FieldType fieldType( final int field ) {
return FieldType.TEXT;
}
public Document getDocument( final InputStream rawContent, final Reference2ObjectMap<Enum<?>,Object> metadata ) {
return new AbstractDocument() {
public CharSequence title() {
return "dummy title";
}
public String toString() {
return title().toString();
}
public CharSequence uri() {
return "dummy://";
}
public Object content( final int field ) throws IOException {
if ( field != 0 ) throw new IndexOutOfBoundsException();
int firstByte = rawContent.read();
if ( firstByte == -1 ) return NullReader.getInstance();
return new CharArrayReader( new char[] { (char)firstByte } );
}
public WordReader wordReader( final int field ) {
return new FastBufferedReader();
}
};
}
}