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// Copyright 2015 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.rules.java;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.query2.proto.proto2api.Build;
import com.google.devtools.build.lib.query2.proto.proto2api.Build.QueryResult;
import com.google.protobuf.TextFormat;
import com.google.protobuf.TextFormat.ParseException;
import java.io.IOException;
import java.io.InputStream;
/**
* A class to parse a {@link JavaToolchainData} from the result of blaze query. It is used by
* {@link com.google.devtools.build.java.bazel.BazelJavaCompiler} to get default options.
*/
public class JavaToolchainDataParser {
/**
* Parse a {@link com.google.devtools.build.lib.query2.proto.proto2api.Build.QueryResult} as
* returned by a bazel query and look for the list of target containing a {@code java_toolchain}
* rule. These rules are then parsed into {@link JavaToolchainData}'s and returned as map with the
* name of the target as key and the {@link JavaToolchainData} as value.
*/
public static ImmutableMap<String, JavaToolchainData> parse(QueryResult queryResult) {
ImmutableMap.Builder<String, JavaToolchainData> builder = ImmutableMap.builder();
for (Build.Target target : queryResult.getTargetList()) {
Build.Rule rule = target.getRule();
if (target.hasRule() && rule.getRuleClass().equals("java_toolchain")) {
builder.put(rule.getName(), parseBuildRuleProto(rule));
}
}
return builder.build();
}
/**
* Parse a text serialization of a
* {@link com.google.devtools.build.lib.query2.proto.proto2api.Build.QueryResult}. See
* {@link #parse(QueryResult)} for the details of the result.
*
* @throws ParseException when the provided string does not corresponds to a bazel query output.
*/
public static ImmutableMap<String, JavaToolchainData> parse(String queryResult)
throws ParseException {
QueryResult.Builder builder = QueryResult.newBuilder();
TextFormat.merge(queryResult, builder);
return parse(builder.build());
}
/**
* Parse a {@link com.google.devtools.build.lib.query2.proto.proto2api.Build.QueryResult} from
* an input stream. See {@link #parse(QueryResult)} for the details of the result.
*/
public static ImmutableMap<String, JavaToolchainData> parse(InputStream queryResult)
throws IOException {
return parse(QueryResult.newBuilder().mergeFrom(queryResult).build());
}
private static JavaToolchainData parseBuildRuleProto(Build.Rule rule) {
String source = "";
String target = "";
String encoding = "";
ImmutableList<String> xlint = ImmutableList.of();
ImmutableList<String> misc = ImmutableList.of();
ImmutableList<String> jvmOpts = ImmutableList.of();
for (Build.Attribute attribute : rule.getAttributeList()) {
switch (attribute.getName()) {
case "source_version":
source = attribute.getStringValue();
break;
case "target_version":
target = attribute.getStringValue();
break;
case "encoding":
encoding = attribute.getStringValue();
break;
case "xlint":
xlint = ImmutableList.copyOf(attribute.getStringListValueList());
break;
case "misc":
misc = ImmutableList.copyOf(attribute.getStringListValueList());
break;
case "jvm_opts":
jvmOpts = ImmutableList.copyOf(attribute.getStringListValueList());
break;
}
}
return new JavaToolchainData(source, target, encoding, xlint, misc, jvmOpts);
}
}
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