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

import static org.apache.juneau.serializer.WriterSerializer.*;

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

import org.apache.juneau.*;

/**
 * Subclass of {@link SerializerSession} for character-based serializers.
 *
 * <h5 class='topic'>Description</h5>
 *
 * This class is typically the parent class of all character-based serializers.
 * <br>It has 1 abstract method to implement...
 * <ul class='spaced-list'>
 * 	<li>
 * 		{@link #doSerialize(SerializerPipe, Object)}
 * </ul>
 *
 * <p>
 * This class is NOT thread safe.
 * It is typically discarded after one-time use although it can be reused within the same thread.
 */
public abstract class WriterSerializerSession extends SerializerSession {

	private final WriterSerializer ctx;
	private final boolean useWhitespace;
	private final Charset streamCharset, fileCharset;

	/**
	 * Create a new session using properties specified in the context.
	 *
	 * @param ctx
	 * 	The context creating this session object.
	 * 	The context contains all the configuration settings for this object.
	 * @param args
	 * 	Runtime arguments.
	 * 	These specify session-level information such as locale and URI context.
	 * 	It also include session-level properties that override the properties defined on the bean and
	 * 	serializer contexts.
	 */
	protected WriterSerializerSession(WriterSerializer ctx, SerializerSessionArgs args) {
		super(ctx, args);
		this.ctx = ctx;
		this.streamCharset = getProperty(WSERIALIZER_streamCharset, Charset.class, ctx.getStreamCharset());
		this.fileCharset = getProperty(WSERIALIZER_fileCharset, Charset.class, ctx.getFileCharset());
		this.useWhitespace = getProperty(WSERIALIZER_useWhitespace, Boolean.class, ctx.isUseWhitespace());
	}

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

	@Override /* SerializerSession */
	public final boolean isWriterSerializer() {
		return true;
	}

	@Override /* SerializerSession */
	protected SerializerPipe createPipe(Object output) {
		return new SerializerPipe(output, streamCharset, fileCharset);
	}

	/**
	 * Convenience method for serializing an object to a <c>String</c>.
	 *
	 * @param o The object to serialize.
	 * @return The output serialized to a string.
	 * @throws SerializeException If a problem occurred trying to convert the output.
	 */
	@Override /* SerializerSession */
	public final String serialize(Object o) throws SerializeException {
		StringWriter w = new StringWriter();
		try {
			serialize(o, w);
		} catch (IOException e) {
			throw new SerializeException(e); // Shouldn't happen.
		}
		return w.toString();
	}

	@Override /* SerializerSession */
	public final String serializeToString(Object o) throws SerializeException {
		return serialize(o);
	}

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

	/**
	 * Configuration property:  Maximum indentation.
	 *
	 * @see WriterSerializer#WSERIALIZER_maxIndent
	 * @return
	 * 	The maximum indentation level in the serialized document.
	 */
	protected final int getMaxIndent() {
		return ctx.getMaxIndent();
	}

	/**
	 * Configuration property:  Quote character.
	 *
	 * @see WriterSerializer#WSERIALIZER_quoteChar
	 * @return
	 * 	The character used for quoting attributes and values.
	 */
	protected final char getQuoteChar() {
		return ctx.getQuoteChar();
	}

	/**
	 * Configuration property:  Use whitespace.
	 *
	 * @see WriterSerializer#WSERIALIZER_useWhitespace
	 * @return
	 * 	The character used for quoting attributes and values.
	 */
	protected final boolean isUseWhitespace() {
		return useWhitespace;
	}

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

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