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// * 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                                                              *
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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
// *                                                                                                                         *
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// ***************************************************************************************************************************
package org.apache.juneau.parser;


import static org.apache.juneau.parser.ReaderParser.*;

import java.io.*;
import java.nio.charset.*;

import org.apache.juneau.*;

/**
 * Subclass of parser session objects for character-based parsers.
 *
 * <p>
 * This class is NOT thread safe.  It is typically discarded after one-time use.
 */
public abstract class ReaderParserSession extends ParserSession {

	private final ReaderParser ctx;
	private final Charset fileCharset, streamCharset;

	/**
	 * Create a new session using properties specified in the context.
	 *
	 * @param ctx
	 * 	The parser creating this session object.
	 * 	The parser contains all the configuration settings for this object.
	 * @param args
	 * 	Runtime session arguments.
	 */
	protected ReaderParserSession(ReaderParser ctx, ParserSessionArgs args) {
		super(ctx, args);
		this.ctx = ctx;
		this.fileCharset = getProperty(RPARSER_fileCharset, Charset.class, ctx.getFileCharset());
		this.streamCharset = getProperty(RPARSER_streamCharset, Charset.class, ctx.getStreamCharset());
	}

	/**
	 * Constructor for sessions that don't require context.
	 *
	 * @param args
	 * 	Runtime session arguments.
	 */
	protected ReaderParserSession(ParserSessionArgs args) {
		this(ReaderParser.DEFAULT, args);
	}


	@Override /* ParserSession */
	public final boolean isReaderParser() {
		return true;
	}

	/**
	 * Wraps the specified input object into a {@link ParserPipe} object so that it can be easily converted into
	 * a stream or reader.
	 *
	 * @param input
	 * 	The input.
	 * 	<br>This can be any of the following types:
	 * 	<ul>
	 * 		<li><jk>null</jk>
	 * 		<li>{@link Reader}
	 * 		<li>{@link CharSequence}
	 * 		<li>{@link InputStream} containing UTF-8 encoded text (or whatever the encoding specified by
	 * 			{@link ReaderParser#RPARSER_streamCharset}).
	 * 		<li><code><jk>byte</jk>[]</code> containing UTF-8 encoded text (or whatever the encoding specified by
	 * 			{@link ReaderParser#RPARSER_streamCharset}).
	 * 		<li>{@link File} containing system encoded text (or whatever the encoding specified by
	 * 			{@link ReaderParser#RPARSER_fileCharset}).
	 * 	</ul>
	 * @return
	 * 	A new {@link ParserPipe} wrapper around the specified input object.
	 */
	@SuppressWarnings("resource")
	@Override /* ParserSesson */
	public final ParserPipe createPipe(Object input) {
		return setPipe(new ParserPipe(input, isDebug(), ctx.isStrict(), ctx.isAutoCloseStreams(), ctx.isUnbuffered(), streamCharset, fileCharset));
	}

	//-----------------------------------------------------------------------------------------------------------------
	// Properties
	//-----------------------------------------------------------------------------------------------------------------

	/**
	 * Returns the file charset defined on this session.
	 *
	 * @return the file charset defined on this session.
	 */
	protected Charset getFileCharset() {
		return fileCharset;
	}

	/**
	 * Returns the stream charset defined on this session.
	 *
	 * @return the stream charset defined on this session.
	 */
	protected Charset getStreamCharset() {
		return streamCharset;
	}

	//-----------------------------------------------------------------------------------------------------------------
	// Other methods
	//-----------------------------------------------------------------------------------------------------------------

	@Override /* Session */
	public ObjectMap toMap() {
		return super.toMap()
			.append("ReaderParserSession", new DefaultFilteringObjectMap()
				.append("fileCharset", fileCharset)
				.append("streamCharset", streamCharset)
			);
	}
}