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/*
 * Copyright (C) 2011 The Guava Authors
 *
 * Licensed 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
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.hash;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;

/**
 * An abstract hasher, implementing {@link #putBoolean(boolean)}, {@link #putDouble(double)},
 * {@link #putFloat(float)}, {@link #putString(CharSequence)}, and
 * {@link #putString(CharSequence, Charset)} as prescribed by {@link Hasher}.
 *
 * @author Dimitris Andreou
 */
abstract class AbstractHasher implements Hasher {
  public final Hasher putBoolean(boolean b) {
    return putByte(b ? (byte) 1 : (byte) 0);
  }

  public final Hasher putDouble(double d) {
    return putLong(Double.doubleToRawLongBits(d));
  }

  public final Hasher putFloat(float f) {
    return putInt(Float.floatToRawIntBits(f));
  }

  public Hasher putString(CharSequence charSequence) {
    for (int i = 0, len = charSequence.length(); i < len; i++) {
      putChar(charSequence.charAt(i));
    }
    return this;
  }

  public Hasher putString(CharSequence charSequence, Charset charset) {
    ByteBuffer buf = charset.encode(CharBuffer.wrap(charSequence));
    if (buf.hasArray()) {
      return putBytes(
          buf.array(), buf.arrayOffset() + buf.position(), buf.limit() + buf.arrayOffset());
    } else {
      byte[] tmp = new byte[buf.remaining()];
      buf.get(tmp);
      return putBytes(tmp);
    }
  }
}