/*
* Copyright 2012-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.cli;
import com.google.common.base.Preconditions;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableSet;
import java.util.Set;
import org.kohsuke.args4j.CmdLineException;
import org.kohsuke.args4j.CmdLineParser;
import org.kohsuke.args4j.OptionDef;
import org.kohsuke.args4j.spi.OptionHandler;
import org.kohsuke.args4j.spi.Parameters;
import org.kohsuke.args4j.spi.Setter;
/**
* {@link OptionHandler} that collects multiple arguments passed to an option in a {@link Set}. In a
* list of command-line arguments:
*
* <ul>
* <li>The option may be specified multiple times.
* <li>When the option is specified, it must have at least one value (multiple values must be
* delimited by spaces).
* <li>The same value may be specified multiple times for the option. However, even though a value
* may be specified more than once, only one instance of it will be present in the resulting
* {@link Set}.
* </ul>
*/
public class StringSetOptionHandler extends OptionHandler<Supplier<ImmutableSet<String>>> {
private final ImmutableSet.Builder<String> builder = ImmutableSet.builder();
private final Supplier<ImmutableSet<String>> supplier = Suppliers.memoize(builder::build);
public StringSetOptionHandler(
CmdLineParser parser, OptionDef option, Setter<? super Supplier<ImmutableSet<String>>> setter)
throws CmdLineException {
super(parser, option, setter);
setter.addValue(supplier);
}
@Override
public String getDefaultMetaVariable() {
return "SET<STRING>";
}
@Override
public int parseArguments(Parameters params) throws CmdLineException {
int counter = 0;
boolean hasValues = false;
while (counter < params.size()) {
String param = params.getParameter(counter);
if (!param.isEmpty() && param.charAt(0) == '-') {
break;
}
hasValues = true;
builder.add(param);
counter++;
}
Preconditions.checkArgument(hasValues, "Option \"%s\" takes one or more operands", option);
return counter;
}
}