/*
 * 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.base.Objects;
import com.google.common.hash.HashCode;
import org.gradle.caching.internal.BuildCacheHasher;

import java.util.Arrays;

/**
 * An immutable snapshot of the state of some value.
 */
public class DefaultValueSnapshot implements ValueSnapshot {
    private final HashCode implementationHash;
    private final byte[] serializedValue;

    public DefaultValueSnapshot(HashCode implementationHash, byte[] serializedValue) {
        this.implementationHash = implementationHash;
        this.serializedValue = serializedValue;
    }

    public HashCode getImplementationHash() {
        return implementationHash;
    }

    public byte[] getValue() {
        return serializedValue;
    }

    @Override
    public boolean maybeSameValue(Object value) {
        return false;
    }

    @Override
    public void appendToHasher(BuildCacheHasher hasher) {
        hasher.putBytes(serializedValue);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj == null || obj.getClass() != getClass()) {
            return false;
        }
        DefaultValueSnapshot other = (DefaultValueSnapshot) obj;
        return Objects.equal(implementationHash, other.implementationHash) && Arrays.equals(serializedValue, other.serializedValue);
    }

    @Override
    public int hashCode() {
        return Arrays.hashCode(serializedValue);
    }
}

@@ -1552,24 +1552,188 @@
 r hasher) %7B%0A
+        if (implementationHash == null) %7B%0A            hasher.putObject(null);%0A        %7D else %7B%0A            hasher.putBytes(implementationHash.asBytes());%0A        %7D%0A
         hash

Include task input value's implementation classpath in build cache key.