| /* |
| * Copyright 2013-present Facebook, Inc. |
| * |
| * 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 com.facebook.buck.step.fs; |
| |
| import com.facebook.buck.step.AbstractExecutionStep; |
| import com.facebook.buck.step.ConditionalStep; |
| import com.facebook.buck.step.ExecutionContext; |
| import com.facebook.buck.util.ProjectFilesystem; |
| import com.facebook.buck.util.TriState; |
| import com.google.common.base.Preconditions; |
| import com.google.common.base.Supplier; |
| |
| import java.io.IOException; |
| import java.nio.file.Path; |
| |
| /** |
| * Step that verifies that a file of non-zero length exists at the specified path. The side effect |
| * of this step is that its {@link #get()} method will return a boolean indicating whether the |
| * file exists. This is designed to be used with a {@link ConditionalStep}. |
| */ |
| public class FileExistsAndIsNotEmptyStep extends AbstractExecutionStep |
| implements Supplier<Boolean> { |
| |
| private final Path pathToFile; |
| private TriState fileExistsAndIsNotEmpty = TriState.UNSPECIFIED; |
| |
| public FileExistsAndIsNotEmptyStep(Path pathToFile) { |
| super("test -s " + pathToFile); |
| this.pathToFile = Preconditions.checkNotNull(pathToFile); |
| } |
| |
| @Override |
| public Boolean get() { |
| Preconditions.checkState(fileExistsAndIsNotEmpty.isSet()); |
| return fileExistsAndIsNotEmpty.asBoolean(); |
| } |
| |
| @Override |
| public int execute(ExecutionContext context) { |
| ProjectFilesystem filesystem = context.getProjectFilesystem(); |
| boolean exists = filesystem.exists(pathToFile.toString()); |
| |
| try { |
| fileExistsAndIsNotEmpty = TriState.forBooleanValue(exists |
| && filesystem.getFileSize(pathToFile) > 0); |
| } catch (IOException e) { |
| context.logError(e, "Failed to get size for file: %s.", pathToFile); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| } |