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// Copyright (C) 2013 The Android Open Source Project
//
// 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.gerrit.server.query.change;
import com.google.auto.value.AutoValue;
import com.google.common.base.Splitter;
import com.google.gerrit.index.query.QueryParseException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* This class is used to extract comma separated values in a predicate.
*
* <p>If tags for the values are present (e.g. "branch=jb_2.3,vote=approved") then the args are
* placed in a map that maps tag to value (e.g., "branch" to "jb_2.3"). If no tag is present (e.g.
* "jb_2.3,approved") then the args are placed into a positional list. Args may be mixed so some may
* appear in the map and others in the positional list (e.g. "vote=approved,jb_2.3).
*/
public class PredicateArgs {
private static final Pattern SPLIT_PATTERN = Pattern.compile("(>|>=|=|<|<=)([^=].*)$");
public List<String> positional;
public Map<String, ValOp> keyValue;
enum Operator {
EQUAL("="),
GREATER_EQUAL(">="),
GREATER(">"),
LESS_EQUAL("<="),
LESS("<");
final String op;
Operator(String op) {
this.op = op;
}
}
@AutoValue
public abstract static class ValOp {
abstract String value();
abstract Operator operator();
static ValOp create(String value, Operator operator) {
return new AutoValue_PredicateArgs_ValOp(value, operator);
}
}
/**
* Parses query arguments into {@link #keyValue} and/or {@link #positional}..
*
* <p>Labels for these arguments should be kept in ChangeQueryBuilder as {@code ARG_ID_[argument
* name]}.
*
* @param args arguments to be parsed
*/
public PredicateArgs(String args) throws QueryParseException {
positional = new ArrayList<>();
keyValue = new HashMap<>();
for (String arg : Splitter.on(',').split(args)) {
Matcher m = SPLIT_PATTERN.matcher(arg);
if (!m.find()) {
positional.add(arg);
} else if (m.groupCount() == 2) {
String key = arg.substring(0, m.start());
String op = m.group(1);
String val = m.group(2);
if (!keyValue.containsKey(key)) {
keyValue.put(key, ValOp.create(val, getOperator(op)));
} else {
throw new QueryParseException("Duplicate key " + key);
}
} else {
throw new QueryParseException("Invalid arg " + arg);
}
}
}
private Operator getOperator(String operator) {
switch (operator) {
case "<":
return Operator.LESS;
case "<=":
return Operator.LESS_EQUAL;
case "=":
return Operator.EQUAL;
case ">=":
return Operator.GREATER_EQUAL;
case ">":
return Operator.GREATER;
default:
throw new IllegalArgumentException("Invalid Operator " + operator);
}
}
}
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