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PropertiesFileAwareClasspathResourceHasher.java
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PropertiesFileAwareClasspathResourceHasher.java
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/*
* 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 com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import org.gradle.api.internal.file.pattern.PathMatcher;
import org.gradle.api.internal.file.pattern.PatternMatcherFactory;
import org.gradle.internal.hash.HashCode;
import org.gradle.internal.hash.Hasher;
import org.gradle.internal.hash.Hashing;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.function.Supplier;
import java.util.stream.Collectors;
public class PropertiesFileAwareClasspathResourceHasher implements ResourceHasher {
private static final Logger LOGGER = LoggerFactory.getLogger(PropertiesFileAwareClasspathResourceHasher.class);
private final ResourceHasher delegate;
private final Map<PathMatcher, ResourceEntryFilter> propertiesFileFilters;
private final List<String> propertiesFilePatterns;
public PropertiesFileAwareClasspathResourceHasher(ResourceHasher delegate, Map<String, ResourceEntryFilter> propertiesFileFilters) {
this.delegate = delegate;
ImmutableList.Builder<String> patterns = ImmutableList.builder();
ImmutableMap.Builder<PathMatcher, ResourceEntryFilter> filters = ImmutableMap.builder();
propertiesFileFilters.forEach((pattern, resourceEntryFilter) -> {
filters.put(PatternMatcherFactory.compile(false, pattern), resourceEntryFilter);
patterns.add(pattern);
});
this.propertiesFileFilters = filters.build();
this.propertiesFilePatterns = patterns.build();
}
@Override
public void appendConfigurationToHasher(Hasher hasher) {
delegate.appendConfigurationToHasher(hasher);
hasher.putString(getClass().getName());
propertiesFilePatterns.forEach(hasher::putString);
propertiesFileFilters.values().forEach(resourceEntryFilter -> resourceEntryFilter.appendConfigurationToHasher(hasher));
}
@Nullable
@Override
public HashCode hash(RegularFileSnapshotContext snapshotContext) {
ResourceEntryFilter resourceEntryFilter = matchingFiltersFor(snapshotContext.getRelativePathSegments());
if (resourceEntryFilter == null) {
return delegate.hash(snapshotContext);
} else {
try (FileInputStream propertiesFileInputStream = new FileInputStream(snapshotContext.getSnapshot().getAbsolutePath())){
return hashProperties(propertiesFileInputStream, resourceEntryFilter);
} catch (Exception e) {
LOGGER.debug("Could not load fingerprint for " + snapshotContext.getSnapshot().getAbsolutePath() + ". Falling back to full entry fingerprinting", e);
return delegate.hash(snapshotContext);
}
}
}
@Nullable
@Override
public HashCode hash(ZipEntryContext zipEntryContext) throws IOException {
ResourceEntryFilter resourceEntryFilter = matchingFiltersFor(zipEntryContext.getRelativePathSegments());
if (resourceEntryFilter == null) {
return delegate.hash(zipEntryContext);
} else {
try {
return hashProperties(zipEntryContext.getEntry().getInputStream(), resourceEntryFilter);
} catch (Exception e) {
LOGGER.debug("Could not load fingerprint for " + zipEntryContext.getRootParentName() + "!" + zipEntryContext.getFullName() + ". Falling back to full entry fingerprinting", e);
return delegate.hash(zipEntryContext);
}
}
}
@Nullable
private ResourceEntryFilter matchingFiltersFor(Supplier<String[]> relativePathSegments) {
List<ResourceEntryFilter> matchingFilters = propertiesFileFilters.entrySet().stream()
.filter(entry -> entry.getKey().matches(relativePathSegments.get(), 0))
.map(Map.Entry::getValue)
.collect(Collectors.toList());
if (matchingFilters.size() == 0) {
return null;
} else if (matchingFilters.size() == 1) {
return matchingFilters.get(0);
} else {
return new UnionResourceEntryFilter(matchingFilters);
}
}
private HashCode hashProperties(InputStream inputStream, ResourceEntryFilter propertyResourceFilter) throws IOException {
Hasher hasher = Hashing.newHasher();
Properties properties = new Properties();
properties.load(new InputStreamReader(inputStream, new PropertyResourceBundleFallbackCharset()));
Map<String, String> entries = Maps.fromProperties(properties);
entries
.entrySet()
.stream()
.filter(entry ->
!propertyResourceFilter.shouldBeIgnored(entry.getKey()))
.sorted(Map.Entry.comparingByKey())
.forEach(entry -> {
hasher.putString(entry.getKey());
hasher.putString(entry.getValue());
});
return hasher.hash();
}
}