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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.packages;
import com.google.devtools.build.lib.util.StringUtil;
import com.google.devtools.common.options.Converter;
import com.google.devtools.common.options.OptionsParsingException;
import java.util.Collections;
import java.util.EnumSet;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* Converter that translates a string of the form "value1,value2,-value3,value4"
* into a corresponding set of allowed Enum values.
*
* <p>Values preceded by '-' are excluded from this set. So "value1,-value2,value3"
* translates to the set [EnumType.value1, EnumType.value3].
*
* <p>If *all* values are exclusions (e.g. "-value1,-value2,-value3"), the returned
* set contains all values for the Enum type *except* those specified.
*/
class EnumFilterConverter<E extends Enum<E>> implements Converter<Set<E>> {
private final Set<String> allowedValues = new LinkedHashSet<>();
private final Class<E> typeClass;
private final String prettyEnumName;
/**
* Constructor.
*
* @param typeClass this should be E.class (Java generics can't infer that directly)
* @param userFriendlyName a user-friendly description of this enum type
*/
public EnumFilterConverter(Class<E> typeClass, String userFriendlyName) {
this.typeClass = typeClass;
this.prettyEnumName = userFriendlyName;
for (E value : EnumSet.allOf(typeClass)) {
allowedValues.add(value.name());
}
}
/**
* Returns the set of allowed values for the option.
*
* Implements {@link #convert(String)}.
*/
@Override
public Set<E> convert(String input) throws OptionsParsingException {
if (input.isEmpty()) {
return Collections.emptySet();
}
EnumSet<E> includedSet = EnumSet.noneOf(typeClass);
EnumSet<E> excludedSet = EnumSet.noneOf(typeClass);
for (String value : input.split(",", -1)) {
boolean excludeFlag = value.startsWith("-");
String s = (excludeFlag ? value.substring(1) : value).toUpperCase();
if (!allowedValues.contains(s)) {
throw new OptionsParsingException("Invalid " + prettyEnumName + " filter '" + value +
"' in the input '" + input + "'");
}
(excludeFlag ? excludedSet : includedSet).add(E.valueOf(typeClass, s));
}
if (includedSet.isEmpty()) {
includedSet = EnumSet.complementOf(excludedSet);
} else {
includedSet.removeAll(excludedSet);
}
if (includedSet.isEmpty()) {
throw new OptionsParsingException(
Character.toUpperCase(prettyEnumName.charAt(0)) + prettyEnumName.substring(1) +
" filter '" + input + "' definition cannot match any tests");
}
return includedSet;
}
/**
* Implements {@link #getTypeDescription()}.
*/
@Override
public final String getTypeDescription() {
return "comma-separated list of values: "
+ StringUtil.joinEnglishList(allowedValues).toLowerCase();
}
}
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