// Copyright 2014 Google Inc. 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 static com.google.devtools.build.lib.packages.Attribute.attr;
import static com.google.devtools.build.lib.packages.Type.STRING;
import static com.google.devtools.build.lib.packages.Type.STRING_LIST;

import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.BaseRuleClasses;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.analysis.RuleDefinitionEnvironment;
import com.google.devtools.build.lib.packages.RuleClass;
import com.google.devtools.build.lib.packages.RuleClass.Builder;

/**
 * Rule definition for {@code java_toolchain}
 */
public final class JavaToolchainRule implements RuleDefinition {
  // TODO(dmarting): remove this and make -client the default once the jvm_opts field is released.
  private final ImmutableList<String> defaultJavacJvmOpts;

  public JavaToolchainRule() {
    defaultJavacJvmOpts = ImmutableList.<String>of("-client");
  }

  /**
   * Construct a {@link JavaToolchainRule} with a different set of default JVM options for Javac.
   */
  public JavaToolchainRule(ImmutableList<String> defaultJavacJvmOpts) {
    this.defaultJavacJvmOpts = defaultJavacJvmOpts;
  }

  @Override
  public RuleClass build(Builder builder, RuleDefinitionEnvironment env) {
    return builder.setUndocumented()
        /* <!-- #BLAZE_RULE(java_toolchain).ATTRIBUTE(source_version) -->
        The Java source version (e.g., '6' or '7'). It specifies which set of code structures
        are allowed in the Java source code.
        <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
        .add(attr("source_version", STRING).mandatory()) // javac -source flag value.
        /* <!-- #BLAZE_RULE(java_toolchain).ATTRIBUTE(target_version) -->
        The Java target version (e.g., '6' or '7'). It specifies for which Java runtime the class
        should be build.
        <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
        .add(attr("target_version", STRING).mandatory()) // javac -target flag value.
        /* <!-- #BLAZE_RULE(java_toolchain).ATTRIBUTE(encoding) -->
        The encoding of the java files (e.g., 'UTF-8').
        <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
        .add(attr("encoding", STRING).mandatory()) // javac -encoding flag value.
        /* <!-- #BLAZE_RULE(java_toolchain).ATTRIBUTE(xlint) -->
        The list of warning to add or removes from default list. Precedes it with a dash to
        removes it. Please see the Javac documentation on the -Xlint options for more information.
        <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
        .add(attr("xlint", STRING_LIST).value(ImmutableList.<String>of()))
        /* <!-- #BLAZE_RULE(java_toolchain).ATTRIBUTE(misc) -->
        The list of extra arguments for the Java compiler. Please refer to the Java compiler
        documentation for the extensive list of possible Java compiler flags.
        <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
        .add(attr("misc", STRING_LIST).value(ImmutableList.<String>of()))
        /* <!-- #BLAZE_RULE(java_toolchain).ATTRIBUTE(jvm_opts) -->
        The list of arguments for the JVM when invoking the Java compiler. Please refer to the Java
        virtual machine documentation for the extensive list of possible flags for this option.
        <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
        .add(attr("jvm_opts", STRING_LIST).value(defaultJavacJvmOpts))
        .build();
  }

  @Override
  public Metadata getMetadata() {
    return RuleDefinition.Metadata.builder()
        .name("java_toolchain")
        .ancestors(BaseRuleClasses.BaseRule.class)
        .factoryClass(JavaToolchain.class)
        .build();
  }
}
/*<!-- #BLAZE_RULE (NAME = java_toolchain, TYPE = OTHER, FAMILY = Java) -->

${ATTRIBUTE_SIGNATURE}

<p>
Specifies the configuration for the Java compiler. Which toolchain to be used can be changed through
the --java_toolchain argument. Normally you should not write those kind of rules unless you want to
tune your Java compiler.
</p>

${ATTRIBUTE_DEFINITION}

<h4 id="java_binary_examples">Examples</h4>

<p>A simple example would be:
</p>

<pre class="code">
java_toolchain(
    name = "toolchain",
    source_version = "7",
    target_version = "7",
    encoding = "UTF-8",
    xlint = [ "classfile", "divzero", "empty", "options", "path" ],
    misc = [ "-g" ],
)
</pre>

<!-- #END_BLAZE_RULE -->*/