/*
* 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.HashCode;
import org.gradle.caching.internal.BuildCacheHasher;
/**
* Identifies a type in a classloader hierarchy. The type is identified by its name,
* the classloader hierarchy by its hash code.
*/
public class ImplementationSnapshot implements Snapshot {
private final String typeName;
private final HashCode classLoaderHash;
public ImplementationSnapshot(String typeName, HashCode classLoaderHash) {
this.typeName = typeName;
this.classLoaderHash = classLoaderHash;
}
public String getTypeName() {
return typeName;
}
public HashCode getClassLoaderHash() {
if (classLoaderHash == null) {
throw new NullPointerException("classLoaderHash");
}
return classLoaderHash;
}
public boolean hasUnknownClassLoader() {
return classLoaderHash == null;
}
@Override
public void appendToHasher(BuildCacheHasher hasher) {
hasher.putString(ImplementationSnapshot.class.getName());
hasher.putString(typeName);
hasher.putHash(classLoaderHash);
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
ImplementationSnapshot that = (ImplementationSnapshot) o;
if (!typeName.equals(that.typeName)) {
return false;
}
if (classLoaderHash == null || that.classLoaderHash == null) {
return false;
}
return classLoaderHash.equals(that.classLoaderHash);
}
@Override
public int hashCode() {
int result = typeName.hashCode();
result = 31 * result + (classLoaderHash != null ? classLoaderHash.hashCode() : 0);
return result;
}
@Override
public String toString() {
return typeName + "@" + classLoaderHash;
}
}