gradle-master/subprojects/normalization-java/src/main/java/org/gradle/api/internal/changedetection/state/IgnoringResourceHasher.java
/*
 * Copyright 2020 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 org.gradle.internal.fingerprint.hashing.RegularFileSnapshotContext;
import org.gradle.internal.fingerprint.hashing.ResourceHasher;
import org.gradle.internal.fingerprint.hashing.ZipEntryContext;
import org.gradle.internal.hash.HashCode;
import org.gradle.internal.hash.Hasher;

import javax.annotation.Nullable;
import java.io.IOException;

public class IgnoringResourceHasher implements ResourceHasher {
    private final ResourceHasher delegate;
    private final ResourceFilter resourceFilter;

    public IgnoringResourceHasher(ResourceHasher delegate, ResourceFilter resourceFilter) {
        this.delegate = delegate;
        this.resourceFilter = resourceFilter;
    }

    @Override
    public void appendConfigurationToHasher(Hasher hasher) {
        delegate.appendConfigurationToHasher(hasher);
        hasher.putString(getClass().getName());
        resourceFilter.appendConfigurationToHasher(hasher);
    }

    @Nullable
    @Override
    public HashCode hash(RegularFileSnapshotContext snapshotContext) throws IOException {
        return resourceFilter.shouldBeIgnored(snapshotContext.getRelativePathSegments()) ? null : delegate.hash(snapshotContext);
    }

    @Nullable
    @Override
    public HashCode hash(ZipEntryContext zipEntryContext) throws IOException {
        return resourceFilter.shouldBeIgnored(zipEntryContext.getRelativePathSegments()) ? null : delegate.hash(zipEntryContext);
    }
}
