/*
* Copyright 2010 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.api.internal.changedetection.rules.TaskStateChange;
import java.io.File;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
import static org.gradle.api.internal.changedetection.state.TaskFilePropertyCompareStrategy.UNORDERED;
/**
* An immutable snapshot of some aspects of the contents and meta-data of a collection of files or directories.
*/
public interface FileCollectionSnapshot extends Snapshot {
FileCollectionSnapshot EMPTY = new DefaultFileCollectionSnapshot(Collections.<String, NormalizedFileSnapshot>emptyMap(), UNORDERED, true);
boolean isEmpty();
/**
* Returns an iterator over the changes to file contents since the given snapshot, subject to the given filters.
*/
Iterator<TaskStateChange> iterateContentChangesSince(FileCollectionSnapshot oldSnapshot, String title);
/**
* Returns the elements of this snapshot, including regular files, directories and missing files
*/
Collection<File> getElements();
/**
* Returns the regular files that make up this snapshot.
*/
Collection<File> getFiles();
Map<String, NormalizedFileSnapshot> getSnapshots();
}