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/**
 * Copyright (c) 2016，Daniel Wang ([email protected]) All rights reserved。
 */
package io.github.jcharm.convert.coder;

import java.util.regex.Pattern;

import io.github.jcharm.convert.Reader;
import io.github.jcharm.convert.SimpledCoder;
import io.github.jcharm.convert.Writer;

/**
 * Pattern 的SimpledCoder实现。
 * 
 * @param  Reader输入的子类型
 * @param  Writer输出的子类型
 */
public class PatternSimpledCoder extends SimpledCoder {

	/** The Constant instance. */
	public static final PatternSimpledCoder instance = new PatternSimpledCoder();

	@Override
	public Pattern convertFrom(final R in) {
		final String value = in.readString();
		if (value == null) {
			return null;
		}
		final int pos = value.indexOf(',');
		return Pattern.compile(value.substring(pos + 1), Integer.parseInt(value.substring(0, pos)));
	}

	@Override
	public void convertTo(final W out, final Pattern value) {
		if (value == null) {
			out.writeNull();
		} else {
			out.writeString(value.flags() + "," + value.pattern());
		}
	}

}