1/*
2 * Copyright (C) 2011 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14
15package com.google.common.hash;
16
17import com.google.common.base.Charsets;
18
19import java.nio.charset.Charset;
20
21/**
22 * An abstract hasher, implementing {@link #putBoolean(boolean)}, {@link #putDouble(double)},
23 * {@link #putFloat(float)}, {@link #putString(CharSequence)}, and
24 * {@link #putString(CharSequence, Charset)} as prescribed by {@link Hasher}.
25 *
26 * @author andreou@google.com (Dimitris Andreou)
27 */
28abstract class AbstractHasher implements Hasher {
29  @Override public final Hasher putBoolean(boolean b) {
30    return putByte(b ? (byte) 1 : (byte) 0);
31  }
32
33  @Override public final Hasher putDouble(double d) {
34    return putLong(Double.doubleToRawLongBits(d));
35  }
36
37  @Override public final Hasher putFloat(float f) {
38    return putInt(Float.floatToRawIntBits(f));
39  }
40
41  @Override public Hasher putString(CharSequence charSequence) {
42    // TODO(user): Should we instead loop over the CharSequence and call #putChar?
43    return putString(charSequence, Charsets.UTF_16LE);
44  }
45
46  @Override public Hasher putString(CharSequence charSequence, Charset charset) {
47    try {
48      return putBytes(charSequence.toString().getBytes(charset.name()));
49    } catch (java.io.UnsupportedEncodingException impossible) {
50      throw new AssertionError(impossible);
51    }
52  }
53}
54