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/* Copyright (c) 2008, Nathan Sweet
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided with the distribution.
 * - Neither the name of Esoteric Software nor the names of its contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

package com.esotericsoftware.kryo.io;

import com.esotericsoftware.kryo.KryoException;

import java.io.DataInput;
import java.io.EOFException;
import java.io.IOException;

/**
 * Best attempt adapter for {@link DataInput}. Currently only {@link #readLine()} is unsupported. Other methods
 * behave slightly differently. For example, {@link #readUTF()} may return a null string.
 *
 * @author Robert DiFalco 
 */
public class KryoDataInput implements DataInput {

	 protected Input input;

	 public KryoDataInput (Input input) {
		  setInput(input);
	 }

	 public void setInput (Input input) {
		  this.input = input;
	 }

	 public void readFully (byte[] b) throws IOException {
		  readFully(b, 0, b.length);
	 }

	 public void readFully (byte[] b, int off, int len) throws IOException {
		  try {
				input.readBytes(b, off, len);
		  } catch (KryoException e) {
				throw new EOFException(e.getMessage());
		  }
	 }

	 public int skipBytes (int n) throws IOException {
		  return (int)input.skip((long)n);
	 }

	 public boolean readBoolean () throws IOException {
		  return input.readBoolean();
	 }

	 public byte readByte () throws IOException {
		  return input.readByte();
	 }

	 public int readUnsignedByte () throws IOException {
		  return input.readByteUnsigned();
	 }

	 public short readShort () throws IOException {
		  return input.readShort();
	 }

	 public int readUnsignedShort () throws IOException {
		  return input.readShortUnsigned();
	 }

	 public char readChar () throws IOException {
		  return input.readChar();
	 }

	 public int readInt () throws IOException {
		  return input.readInt();
	 }

	 public long readLong () throws IOException {
		  return input.readLong();
	 }

	 public float readFloat () throws IOException {
		  return input.readFloat();
	 }

	 public double readDouble () throws IOException {
		  return input.readDouble();
	 }

	 /**
	  * This is not currently implemented. The method will currently throw an {@link java.lang.UnsupportedOperationException}
	  * whenever it is called.
	  *
	  * @throws UnsupportedOperationException when called.
	  * @deprecated this method is not supported in this implementation.
	  */
	 public String readLine () throws UnsupportedOperationException {
		  throw new UnsupportedOperationException();
	 }

	 /**
	  * Reads the length and string of UTF8 characters, or null. This can read strings written by
	  * {@link KryoDataOutput#writeUTF(String)},
	  * {@link com.esotericsoftware.kryo.io.Output#writeString(String)},
	  * {@link com.esotericsoftware.kryo.io.Output#writeString(CharSequence)}, and
	  * {@link com.esotericsoftware.kryo.io.Output#writeAscii(String)}.
	  *
	  * @return May be null.
	  */
	 public String readUTF () throws IOException {
		  return input.readString();
	 }
}