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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2015 The Closure Compiler 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 com.google.javascript.jscomp.resources;

import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ImmutableMap;
import com.google.common.io.CharStreams;
import com.google.javascript.jscomp.ConformanceConfig;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * Utility class that handles resource loading.
 */
@GwtIncompatible("getResource, java.io.InputStreamReader")
public final class ResourceLoader {
  public static String loadTextResource(Class clazz, String path) {
    try {
      return CharStreams.toString(new InputStreamReader(clazz.getResourceAsStream(path), UTF_8));
    } catch (NullPointerException e) {
      if (!resourceExists(clazz, path)) {
        throw new RuntimeException("No such resource: " + path);
      }
      throw e;
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }

  public static ImmutableMap loadPropertiesMap(
      Class clazz, String resourceName) {
    return PropertiesParser.parse(loadTextResource(clazz, resourceName));
  }

  /** Load the global ConformanceConfig */
  public static ConformanceConfig loadGlobalConformance(Class clazz) {
    ConformanceConfig.Builder builder = ConformanceConfig.newBuilder();
    if (resourceExists(clazz, "global_conformance.binarypb")) {
      try {
        builder.mergeFrom(clazz.getResourceAsStream("global_conformance.binarypb"));
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
    return builder.build();
  }

  public static boolean resourceExists(Class clazz, String path) {
    return clazz.getResource(path) != null;
  }

  private ResourceLoader() {}
}