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diff --git a/libphonenumber/src/com/google/i18n/phonenumbers/MultiFileMetadataSourceImpl.java b/libphonenumber/src/com/google/i18n/phonenumbers/MultiFileMetadataSourceImpl.java
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+++ b/libphonenumber/src/com/google/i18n/phonenumbers/MultiFileMetadataSourceImpl.java
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+/*
+ * Copyright (C) 2015 The Libphonenumber 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.i18n.phonenumbers;
+
+import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadataCollection;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ObjectInputStream;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Implementation of {@link MetadataSource} that reads from multiple resource files.
+ */
+final class MultiFileMetadataSourceImpl implements MetadataSource {
+
+  private static final Logger logger =
+      Logger.getLogger(MultiFileMetadataSourceImpl.class.getName());
+
+  private static final String META_DATA_FILE_PREFIX =
+      "/com/google/i18n/phonenumbers/data/PhoneNumberMetadataProto";
+
+  // A mapping from a region code to the PhoneMetadata for that region.
+  // Note: Synchronization, though only needed for the Android version of the library, is used in
+  // all versions for consistency.
+  private final Map<String, PhoneMetadata> regionToMetadataMap =
+      Collections.synchronizedMap(new HashMap<String, PhoneMetadata>());
+
+  // A mapping from a country calling code for a non-geographical entity to the PhoneMetadata for
+  // that country calling code. Examples of the country calling codes include 800 (International
+  // Toll Free Service) and 808 (International Shared Cost Service).
+  // Note: Synchronization, though only needed for the Android version of the library, is used in
+  // all versions for consistency.
+  private final Map<Integer, PhoneMetadata> countryCodeToNonGeographicalMetadataMap =
+      Collections.synchronizedMap(new HashMap<Integer, PhoneMetadata>());
+
+  // The prefix of the metadata files from which region data is loaded.
+  private final String currentFilePrefix;
+
+  // The metadata loader used to inject alternative metadata sources.
+  private final MetadataLoader metadataLoader;
+
+  // It is assumed that metadataLoader is not null.
+  public MultiFileMetadataSourceImpl(String currentFilePrefix, MetadataLoader metadataLoader) {
+    this.currentFilePrefix = currentFilePrefix;
+    this.metadataLoader = metadataLoader;
+  }
+
+  // It is assumed that metadataLoader is not null.
+  public MultiFileMetadataSourceImpl(MetadataLoader metadataLoader) {
+    this(META_DATA_FILE_PREFIX, metadataLoader);
+  }
+
+  @Override
+  public PhoneMetadata getMetadataForRegion(String regionCode) {
+    synchronized (regionToMetadataMap) {
+      if (!regionToMetadataMap.containsKey(regionCode)) {
+        // The regionCode here will be valid and won't be '001', so we don't need to worry about
+        // what to pass in for the country calling code.
+        loadMetadataFromFile(currentFilePrefix, regionCode, 0, metadataLoader);
+      }
+    }
+    return regionToMetadataMap.get(regionCode);
+  }
+
+  @Override
+  public PhoneMetadata getMetadataForNonGeographicalRegion(int countryCallingCode) {
+    synchronized (countryCodeToNonGeographicalMetadataMap) {
+      if (!countryCodeToNonGeographicalMetadataMap.containsKey(countryCallingCode)) {
+        loadMetadataFromFile(currentFilePrefix, PhoneNumberUtil.REGION_CODE_FOR_NON_GEO_ENTITY,
+            countryCallingCode, metadataLoader);
+      }
+    }
+    return countryCodeToNonGeographicalMetadataMap.get(countryCallingCode);
+  }
+
+  // @VisibleForTesting
+  void loadMetadataFromFile(String filePrefix, String regionCode, int countryCallingCode,
+      MetadataLoader metadataLoader) {
+    boolean isNonGeoRegion = PhoneNumberUtil.REGION_CODE_FOR_NON_GEO_ENTITY.equals(regionCode);
+    String fileName = filePrefix + "_" +
+        (isNonGeoRegion ? String.valueOf(countryCallingCode) : regionCode);
+    InputStream source = metadataLoader.loadMetadata(fileName);
+    if (source == null) {
+      logger.log(Level.SEVERE, "missing metadata: " + fileName);
+      throw new IllegalStateException("missing metadata: " + fileName);
+    }
+    ObjectInputStream in = null;
+    try {
+      in = new ObjectInputStream(source);
+      PhoneMetadataCollection metadataCollection = loadMetadataAndCloseInput(in);
+      List<PhoneMetadata> metadataList = metadataCollection.getMetadataList();
+      if (metadataList.isEmpty()) {
+        logger.log(Level.SEVERE, "empty metadata: " + fileName);
+        throw new IllegalStateException("empty metadata: " + fileName);
+      }
+      if (metadataList.size() > 1) {
+        logger.log(Level.WARNING, "invalid metadata (too many entries): " + fileName);
+      }
+      PhoneMetadata metadata = metadataList.get(0);
+      if (isNonGeoRegion) {
+        countryCodeToNonGeographicalMetadataMap.put(countryCallingCode, metadata);
+      } else {
+        regionToMetadataMap.put(regionCode, metadata);
+      }
+    } catch (IOException e) {
+      logger.log(Level.SEVERE, "cannot load/parse metadata: " + fileName, e);
+      throw new RuntimeException("cannot load/parse metadata: " + fileName, e);
+    }
+  }
+
+  /**
+   * Loads the metadata protocol buffer from the given stream and closes the stream afterwards. Any
+   * exceptions that occur while reading the stream are propagated (though exceptions that occur
+   * when the stream is closed will be ignored).
+   *
+   * @param source  the non-null stream from which metadata is to be read.
+   * @return        the loaded metadata protocol buffer.
+   */
+  private static PhoneMetadataCollection loadMetadataAndCloseInput(ObjectInputStream source) {
+    PhoneMetadataCollection metadataCollection = new PhoneMetadataCollection();
+    try {
+      metadataCollection.readExternal(source);
+    } catch (IOException e) {
+      logger.log(Level.WARNING, "error reading input (ignored)", e);
+    } finally {
+      try {
+        source.close();
+      } catch (IOException e) {
+        logger.log(Level.WARNING, "error closing input stream (ignored)", e);
+      }
+    }
+    return metadataCollection;
+  }
+}