1 // Copyright 2015 The Bazel Authors. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 package com.google.devtools.build.android; 15 16 import com.google.devtools.common.options.Converter; 17 import com.google.devtools.common.options.OptionsParsingException; 18 import java.nio.file.FileSystems; 19 import java.nio.file.Files; 20 import java.nio.file.InvalidPathException; 21 import java.nio.file.Path; 22 23 /** 24 * Some convenient converters used by android actions. Note: These are specific to android actions. 25 */ 26 public final class Converters { 27 private static final Converter<String> IDENTITY_CONVERTER = 28 new Converter<String>() { 29 @Override 30 public String convert(String input) { 31 return input; 32 } 33 34 @Override 35 public String getTypeDescription() { 36 return "a string"; 37 } 38 }; 39 40 /** Validating converter for Paths. A Path is considered valid if it resolves to a file. */ 41 public static class PathConverter implements Converter<Path> { 42 43 private final boolean mustExist; 44 45 public PathConverter() { 46 this.mustExist = false; 47 } 48 49 protected PathConverter(boolean mustExist) { 50 this.mustExist = mustExist; 51 } 52 53 @Override 54 public Path convert(String input) throws OptionsParsingException { 55 try { 56 Path path = FileSystems.getDefault().getPath(input); 57 if (mustExist && !Files.exists(path)) { 58 throw new OptionsParsingException( 59 String.format("%s is not a valid path: it does not exist.", input)); 60 } 61 return path; 62 } catch (InvalidPathException e) { 63 throw new OptionsParsingException( 64 String.format("%s is not a valid path: %s.", input, e.getMessage()), e); 65 } 66 } 67 68 @Override 69 public String getTypeDescription() { 70 return "a valid filesystem path"; 71 } 72 } 73 74 /** 75 * Validating converter for Paths. A Path is considered valid if it resolves to a file and exists. 76 */ 77 public static class ExistingPathConverter extends PathConverter { 78 public ExistingPathConverter() { 79 super(true); 80 } 81 } 82 } 83
