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.io.File; 19 import java.nio.file.FileSystems; 20 import java.nio.file.Files; 21 import java.nio.file.InvalidPathException; 22 import java.nio.file.Path; 23 24 /** 25 * Some convenient converters used by android actions. Note: These are specific to android actions. 26 */ 27 public final class Converters { 28 private static final Converter<String> IDENTITY_CONVERTER = new Converter<String>() { 29 @Override public String convert(String input) { 30 return input; 31 } 32 33 @Override public String getTypeDescription() { 34 return "a string"; 35 } 36 }; 37 38 /** Validating converter for Paths. A Path is considered valid if it resolves to a file. */ 39 public static class PathConverter implements Converter<Path> { 40 41 private final boolean mustExist; 42 PathConverter()43 public PathConverter() { 44 this.mustExist = false; 45 } 46 PathConverter(boolean mustExist)47 protected PathConverter(boolean mustExist) { 48 this.mustExist = mustExist; 49 } 50 51 @Override convert(String input)52 public Path convert(String input) throws OptionsParsingException { 53 try { 54 Path path = FileSystems.getDefault().getPath(input); 55 if (mustExist && !Files.exists(path)) { 56 throw new OptionsParsingException( 57 String.format("%s is not a valid path: it does not exist.", input)); 58 } 59 return path; 60 } catch (InvalidPathException e) { 61 throw new OptionsParsingException( 62 String.format("%s is not a valid path: %s.", input, e.getMessage()), e); 63 } 64 } 65 66 @Override getTypeDescription()67 public String getTypeDescription() { 68 return "a valid filesystem path"; 69 } 70 } 71 72 /** 73 * Validating converter for Paths. A Path is considered valid if it resolves to a file and exists. 74 */ 75 public static class ExistingPathConverter extends PathConverter { ExistingPathConverter()76 public ExistingPathConverter() { 77 super(true); 78 } 79 } 80 } 81