/*
* Copyright 2017 the original author or 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 org.gradle.api.internal.changedetection.state;
import com.google.common.hash.Funnel;
import com.google.common.hash.HashCode;
import com.google.common.hash.Hasher;
import java.nio.charset.Charset;
public class TrackingHasher implements Hasher {
private final Hasher delegate;
private boolean modified;
public TrackingHasher(Hasher delegate) {
this.delegate = delegate;
}
@Override
public Hasher putByte(byte b) {
markModified();
return delegate.putByte(b);
}
@Override
public Hasher putBytes(byte[] bytes) {
markModified();
return delegate.putBytes(bytes);
}
@Override
public Hasher putBytes(byte[] bytes, int off, int len) {
markModified();
return delegate.putBytes(bytes, off, len);
}
@Override
public Hasher putShort(short s) {
markModified();
return delegate.putShort(s);
}
@Override
public Hasher putInt(int i) {
markModified();
return delegate.putInt(i);
}
@Override
public Hasher putLong(long l) {
markModified();
return delegate.putLong(l);
}
@Override
public Hasher putFloat(float f) {
markModified();
return delegate.putFloat(f);
}
@Override
public Hasher putDouble(double d) {
markModified();
return delegate.putDouble(d);
}
@Override
public Hasher putBoolean(boolean b) {
markModified();
return delegate.putBoolean(b);
}
@Override
public Hasher putChar(char c) {
markModified();
return delegate.putChar(c);
}
@Override
public Hasher putUnencodedChars(CharSequence charSequence) {
markModified();
return delegate.putUnencodedChars(charSequence);
}
@Override
public Hasher putString(CharSequence charSequence, Charset charset) {
markModified();
return delegate.putString(charSequence, charset);
}
@Override
public <T> Hasher putObject(T instance, Funnel<? super T> funnel) {
markModified();
return delegate.putObject(instance, funnel);
}
private void markModified() {
modified = true;
}
@Override
public HashCode hash() {
if (modified) {
return delegate.hash();
} else {
return null;
}
}
}