/*
* Copyright 2013 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.internal.typeconversion;
import com.google.common.base.Joiner;
import org.gradle.api.Transformer;
import org.gradle.api.specs.Spec;
import org.gradle.internal.exceptions.DiagnosticsVisitor;
import org.gradle.util.CollectionUtils;
import org.gradle.util.GUtil;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class EnumFromCharSequenceNotationParser<T extends Enum> implements NotationConverter<CharSequence, T> {
private final Class<? extends T> type;
public EnumFromCharSequenceNotationParser(Class<? extends T> enumType) {
assert enumType.isEnum() : "resultingType must be enum";
this.type = enumType;
}
@Override
public void convert(CharSequence notation, NotationConvertResult<? super T> result) throws TypeConversionException {
final String enumString = notation.toString();
List<? extends T> enumConstants = Arrays.asList(type.getEnumConstants());
T match = CollectionUtils.findFirst(enumConstants, new Spec<T>() {
public boolean isSatisfiedBy(T enumValue) {
return enumValue.name().equalsIgnoreCase(enumString);
}
});
if (match == null) {
throw new TypeConversionException(
String.format("Cannot convert string value '%s' to an enum value of type '%s' (valid case insensitive values: %s)",
enumString, type.getName(), Joiner.on(", ").join(CollectionUtils.collect(Arrays.asList(type.getEnumConstants()), new Transformer<String, T>() {
@Override
public String transform(T t) {
return t.name();
}
}))
)
);
}
result.converted(match);
}
@Override
public void describe(DiagnosticsVisitor visitor) {
List<String> values = new ArrayList<String>();
final Enum[] enumConstants = type.getEnumConstants();
for (Enum enumConstant : enumConstants) {
values.add(enumConstant.name());
}
visitor.candidate(String.format("One of the following values: %s", GUtil.toString(values)));
visitor.values(values);
}
}