| /* |
| * 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 com.google.common.base.Preconditions; |
| import com.google.errorprone.annotations.CanIgnoreReturnValue; |
| import java.nio.ByteBuffer; |
| import java.nio.charset.Charset; |
| |
| /** |
| * An abstract implementation of {@link Hasher}, which only requires subtypes to implement {@link |
| * #putByte}. Subtypes may provide more efficient implementations, however. |
| * |
| * @author Dimitris Andreou |
| */ |
| @CanIgnoreReturnValue |
| abstract class AbstractHasher implements Hasher { |
| @Override |
| public final Hasher putBoolean(boolean b) { |
| return putByte(b ? (byte) 1 : (byte) 0); |
| } |
| |
| @Override |
| public final Hasher putDouble(double d) { |
| return putLong(Double.doubleToRawLongBits(d)); |
| } |
| |
| @Override |
| public final Hasher putFloat(float f) { |
| return putInt(Float.floatToRawIntBits(f)); |
| } |
| |
| @Override |
| public Hasher putUnencodedChars(CharSequence charSequence) { |
| for (int i = 0, len = charSequence.length(); i < len; i++) { |
| putChar(charSequence.charAt(i)); |
| } |
| return this; |
| } |
| |
| @Override |
| public Hasher putString(CharSequence charSequence, Charset charset) { |
| return putBytes(charSequence.toString().getBytes(charset)); |
| } |
| |
| @Override |
| public Hasher putBytes(byte[] bytes) { |
| return putBytes(bytes, 0, bytes.length); |
| } |
| |
| @Override |
| public Hasher putBytes(byte[] bytes, int off, int len) { |
| Preconditions.checkPositionIndexes(off, off + len, bytes.length); |
| for (int i = 0; i < len; i++) { |
| putByte(bytes[off + i]); |
| } |
| return this; |
| } |
| |
| @Override |
| public Hasher putBytes(ByteBuffer b) { |
| if (b.hasArray()) { |
| putBytes(b.array(), b.arrayOffset() + b.position(), b.remaining()); |
| b.position(b.limit()); |
| } else { |
| for (int remaining = b.remaining(); remaining > 0; remaining--) { |
| putByte(b.get()); |
| } |
| } |
| return this; |
| } |
| |
| @Override |
| public Hasher putShort(short s) { |
| putByte((byte) s); |
| putByte((byte) (s >>> 8)); |
| return this; |
| } |
| |
| @Override |
| public Hasher putInt(int i) { |
| putByte((byte) i); |
| putByte((byte) (i >>> 8)); |
| putByte((byte) (i >>> 16)); |
| putByte((byte) (i >>> 24)); |
| return this; |
| } |
| |
| @Override |
| public Hasher putLong(long l) { |
| for (int i = 0; i < 64; i += 8) { |
| putByte((byte) (l >>> i)); |
| } |
| return this; |
| } |
| |
| @Override |
| public Hasher putChar(char c) { |
| putByte((byte) c); |
| putByte((byte) (c >>> 8)); |
| return this; |
| } |
| |
| @Override |
| public <T> Hasher putObject(T instance, Funnel<? super T> funnel) { |
| funnel.funnel(instance, this); |
| return this; |
| } |
| } |