com.facebook.presto.jdbc.internal.guava.hash.AbstractHasher Maven / Gradle / Ivy
/*
* 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.facebook.presto.jdbc.internal.guava.hash;
import com.facebook.presto.jdbc.internal.guava.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 Hasher putObject(T instance, Funnel super T> funnel) {
funnel.funnel(instance, this);
return this;
}
}
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