/*
* Copyright 2011 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.tasks.execution;
import org.gradle.api.GradleException;
import org.gradle.api.execution.internal.TaskInputsListener;
import org.gradle.api.file.FileCollection;
import org.gradle.api.internal.TaskInternal;
import org.gradle.api.internal.changedetection.TaskArtifactState;
import org.gradle.api.internal.file.FileCollectionInternal;
import org.gradle.api.internal.tasks.TaskExecuter;
import org.gradle.api.internal.tasks.TaskExecutionContext;
import org.gradle.api.internal.tasks.TaskExecutionOutcome;
import org.gradle.api.internal.tasks.TaskStateInternal;
import org.gradle.api.logging.Logger;
import org.gradle.api.logging.Logging;
import org.gradle.internal.Cast;
import java.io.File;
import java.util.Set;
/**
* A {@link TaskExecuter} which skips tasks whose source file collection is empty.
*/
public class SkipEmptySourceFilesTaskExecuter implements TaskExecuter {
private static final Logger LOGGER = Logging.getLogger(SkipEmptySourceFilesTaskExecuter.class);
private final TaskInputsListener taskInputsListener;
private final TaskExecuter executer;
public SkipEmptySourceFilesTaskExecuter(TaskInputsListener taskInputsListener, TaskExecuter executer) {
this.taskInputsListener = taskInputsListener;
this.executer = executer;
}
public void execute(TaskInternal task, TaskStateInternal state, TaskExecutionContext context) {
FileCollection sourceFiles = task.getInputs().getSourceFiles();
if (task.getInputs().getHasSourceFiles() && sourceFiles.isEmpty()) {
TaskArtifactState taskArtifactState = context.getTaskArtifactState();
FileCollection outputFiles = taskArtifactState.getExecutionHistory().getOutputFiles();
if (outputFiles == null) {
state.setOutcome(TaskExecutionOutcome.NO_SOURCE);
LOGGER.info("Skipping {} as it has no source files and no history of previous output files.", task);
} else if (outputFiles.isEmpty()) {
state.setOutcome(TaskExecutionOutcome.NO_SOURCE);
LOGGER.info("Skipping {} as it has no source files and no previous output files.", task);
} else {
Set<File> outputFileSet = outputFiles.getFiles();
boolean deletedFiles = false;
boolean debugEnabled = LOGGER.isDebugEnabled();
for (File file : outputFileSet) {
if (file.isFile()) {
if (file.delete()) {
if (debugEnabled) {
LOGGER.debug("Deleted stale output file '{}'.", file.getAbsolutePath());
}
} else {
state.setOutcome(new GradleException(String.format("Could not delete file: '%s'.", file.getAbsolutePath())));
return;
}
deletedFiles = true;
}
}
if (deletedFiles) {
LOGGER.info("Cleaned previous output of {} as it has no source files.", task);
state.setOutcome(TaskExecutionOutcome.EXECUTED);
} else {
state.setOutcome(TaskExecutionOutcome.NO_SOURCE);
}
}
taskInputsListener.onExecute(task, Cast.cast(FileCollectionInternal.class, sourceFiles));
return;
} else {
taskInputsListener.onExecute(task, Cast.cast(FileCollectionInternal.class, task.getInputs().getFiles()));
}
executer.execute(task, state, context);
}
}