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package org.apache.juneau.swaps;

import static org.apache.juneau.internal.StringUtils.*;

import org.apache.juneau.*;
import org.apache.juneau.swap.*;

/**
 * Transforms <code><jk>byte</jk>[]</code> arrays to Strings.
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc jm.Swaps}
 * 	<li class='extlink'>{@source}
 * </ul>
 */
public abstract class ByteArraySwap extends StringSwap<byte[]> {

	/**
	 * Converts byte arrays to BASE-64 encoding.
	 */
	public static class Base64 extends ByteArraySwap {
		/**
		 * Converts the specified <code><jk>byte</jk>[]</code> to a {@link String}.
		 */
		@Override /* ObjectSwap */
		public String swap(BeanSession session, byte[] b) throws Exception {
			return base64Encode(b);
		}

		/**
		 * Converts the specified {@link String} to a <code><jk>byte</jk>[]</code>.
		 */
		@Override /* ObjectSwap */
		public byte[] unswap(BeanSession session, String s, ClassMeta<?> hint) throws Exception {
			return base64Decode(s);
		}
	}

	/**
	 * Converts byte arrays to hex encoding.
	 */
	public static class Hex extends ByteArraySwap {
		/**
		 * Converts the specified <code><jk>byte</jk>[]</code> to a {@link String}.
		 */
		@Override /* ObjectSwap */
		public String swap(BeanSession session, byte[] b) throws Exception {
			return toHex(b);
		}

		/**
		 * Converts the specified {@link String} to a <code><jk>byte</jk>[]</code>.
		 */
		@Override /* ObjectSwap */
		public byte[] unswap(BeanSession session, String s, ClassMeta<?> hint) throws Exception {
			return fromHex(s);
		}
	}

	/**
	 * Converts byte arrays to spaced-hex encoding.
	 */
	public static class SpacedHex extends ByteArraySwap {
		/**
		 * Converts the specified <code><jk>byte</jk>[]</code> to a {@link String}.
		 */
		@Override /* ObjectSwap */
		public String swap(BeanSession session, byte[] b) throws Exception {
			return toSpacedHex(b);
		}

		/**
		 * Converts the specified {@link String} to a <code><jk>byte</jk>[]</code>.
		 */
		@Override /* ObjectSwap */
		public byte[] unswap(BeanSession session, String s, ClassMeta<?> hint) throws Exception {
			return fromSpacedHex(s);
		}
	}
}
