org.gradle.api.file.FileCollection Maven / Gradle / Ivy
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/*
* 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.file;
import groovy.lang.Closure;
import org.gradle.api.Buildable;
import org.gradle.api.Incubating;
import org.gradle.api.provider.Provider;
import org.gradle.api.specs.Spec;
import org.gradle.api.tasks.AntBuilderAware;
import org.gradle.internal.HasInternalProtocol;
import java.io.File;
import java.util.Set;
/**
* A {@code FileCollection} represents a collection of file system locations which you can query in certain ways. A file collection
* is can be used to define a classpath, or a set of source files, or to add files to an archive.
*
* There are no methods on this interface that allow the contents of the collection to be modified. However, there are a number of sub-interfaces, such as {@link ConfigurableFileCollection} that
* allow changes to be made.
*
* A file collection may contain task outputs. The file collection tracks not just a set of files, but also the tasks that produce those files. When a file collection is used as a task input
* property, Gradle will take care of automatically adding dependencies between the consuming task and the producing tasks.
*
* You can obtain a {@code FileCollection} instance using {@link org.gradle.api.Project#files}.
*/
@HasInternalProtocol
public interface FileCollection extends Iterable, AntBuilderAware, Buildable {
/**
* Returns the content of this collection, asserting it contains exactly one file.
*
* @return The file.
* @throws IllegalStateException when this collection does not contain exactly one file.
*/
File getSingleFile() throws IllegalStateException;
/**
* Returns the contents of this collection as a {@link Set}. The contents of a file collection may change over time.
*
* Note that this method returns {@link File} objects that represent locations on the file system. These {@link File} objects do not necessarily refer to regular files.
* Depending on the implementation of this file collection and how it has been configured, the returned set may contain directories, or missing files, or any other kind of
* file system element.
*
*
* @return The files. Returns an empty set if this collection is empty.
*/
Set getFiles();
/**
* Determines whether this collection contains the given file. Generally, this method is more efficient than calling
* {@code getFiles().contains(file)}.
*
* @param file The file to check for.
* @return true if this collection contains the given file, false otherwise.
*/
boolean contains(File file);
/**
* Returns the contents of this collection as a platform-specific path. This can be used, for example, in an Ant
* <path> element.
*
* @return The path. Returns an empty string if this collection is empty.
*/
String getAsPath();
/**
* Returns a {@code FileCollection} which contains the union of this collection and the given collection. The
* returned collection is live, and tracks changes to both source collections.
*
* You can call this method in your build script using the {@code +} operator.
*
* @param collection The other collection. Should not be null.
* @return A new collection containing the union.
*/
FileCollection plus(FileCollection collection);
/**
* Returns a {@code FileCollection} which contains the difference between this collection and the given
* collection. The returned collection is live, and tracks changes to both source collections.
*
* You can call this method in your build script using the {@code -} operator.
*
* @param collection The other collection. Should not be null.
* @return A new collection containing the difference.
*/
FileCollection minus(FileCollection collection);
/**
* Restricts the contents of this collection to those files which match the given criteria. The filtered
* collection is live, so that it reflects any changes to this collection.
*
* The given closure is passed the File as a parameter, and should return a boolean value.
*
* @param filterClosure The closure to use to select the contents of the filtered collection.
* @return The filtered collection.
*/
FileCollection filter(Closure filterClosure);
/**
* Restricts the contents of this collection to those files which match the given criteria. The filtered
* collection is live, so that it reflects any changes to this collection.
*
* @param filterSpec The criteria to use to select the contents of the filtered collection.
* @return The filtered collection.
*/
FileCollection filter(Spec filterSpec);
/**
* Returns true if this collection is empty. Generally, calling this method is more efficient than calling {@code
* getFiles().isEmpty()}.
*
* @return true if this collection is empty, false otherwise.
*/
boolean isEmpty();
/**
* Converts this collection to a {@link FileTree}, if not already. For each file in this collection, the resulting file
* tree will contain the source file at the root of the tree. For each directory in this collection, the resulting
* file tree will contain all the files under the source directory.
*
* The returned {@link FileTree} is live, and tracks changes to this file collection and the producer tasks of this file collection.
*
* @return this collection as a {@link FileTree}. Never returns null.
*/
FileTree getAsFileTree();
/**
* Returns the contents of this file collection as a {@link Provider} of {@link FileSystemLocation} instances. See {@link #getFiles()} for more details.
*
* The returned {@link Provider} is live, and tracks changes to this file collection and the producer tasks of this file collection.
*
* @since 5.6
*/
@Incubating
Provider> getElements();
/**
* Ant types which a {@code FileCollection} can be mapped to.
*/
enum AntType {
MatchingTask, FileSet, ResourceCollection
}
/**
* Adds this collection to an Ant task as a nested node. The given type determines how this collection is added:
*
*
*
* - {@link AntType#MatchingTask}: adds this collection to an Ant MatchingTask. The collection is converted to a
* set of source directories and include and exclude patterns. The source directories as added as an Ant Path with
* the given node name. The patterns are added using 'include' and 'exclude' nodes.
*
* - {@link AntType#FileSet}: adds this collection as zero or more Ant FileSets with the given node name.
*
* - {@link AntType#ResourceCollection}: adds this collection as zero or more Ant ResourceCollections with the
* given node name.
*
*
*
* You should prefer using {@link AntType#ResourceCollection}, if the target Ant task supports it, as this is
* generally the most efficient. Using the other types may involve copying the contents of this collection to a
* temporary directory.
*
* @param builder The builder to add this collection to.
* @param nodeName The target node name.
* @param type The target Ant type
*/
void addToAntBuilder(Object builder, String nodeName, AntType type);
/**
* Adds this collection to an Ant task as a nested node. Equivalent to calling {@code addToAntBuilder(builder,
* nodeName,AntType.ResourceCollection)}.
*/
@Override
Object addToAntBuilder(Object builder, String nodeName);
}