1 files changed, 141 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/api/changes/ChangesImpl.java b/java/com/google/gerrit/server/api/changes/ChangesImpl.java
new file mode 100644
index 0000000000..2f19040935
--- /dev/null
+++ b/java/com/google/gerrit/server/api/changes/ChangesImpl.java
@@ -0,0 +1,141 @@
+// 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.api.changes;
+
+import static com.google.common.base.Preconditions.checkState;
+import static com.google.gerrit.server.api.ApiUtil.asRestApiException;
+import static java.util.Objects.requireNonNull;
+
+import com.google.common.base.Joiner;
+import com.google.common.collect.ImmutableList;
+import com.google.gerrit.extensions.api.changes.ChangeApi;
+import com.google.gerrit.extensions.api.changes.Changes;
+import com.google.gerrit.extensions.client.ListChangesOption;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.ChangeInput;
+import com.google.gerrit.extensions.restapi.IdString;
+import com.google.gerrit.extensions.restapi.RestApiException;
+import com.google.gerrit.extensions.restapi.TopLevelResource;
+import com.google.gerrit.extensions.restapi.Url;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.server.restapi.change.ChangesCollection;
+import com.google.gerrit.server.restapi.change.CreateChange;
+import com.google.gerrit.server.restapi.change.QueryChanges;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+import java.util.List;
+
+@Singleton
+class ChangesImpl implements Changes {
+  private final ChangesCollection changes;
+  private final ChangeApiImpl.Factory api;
+  private final CreateChange createChange;
+  private final Provider<QueryChanges> queryProvider;
+
+  @Inject
+  ChangesImpl(
+      ChangesCollection changes,
+      ChangeApiImpl.Factory api,
+      CreateChange createChange,
+      Provider<QueryChanges> queryProvider) {
+    this.changes = changes;
+    this.api = api;
+    this.createChange = createChange;
+    this.queryProvider = queryProvider;
+  }
+
+  @Override
+  public ChangeApi id(int id) throws RestApiException {
+    return id(String.valueOf(id));
+  }
+
+  @Override
+  public ChangeApi id(String project, String branch, String id) throws RestApiException {
+    return id(
+        Joiner.on('~')
+            .join(ImmutableList.of(Url.encode(project), Url.encode(branch), Url.encode(id))));
+  }
+
+  @Override
+  public ChangeApi id(String id) throws RestApiException {
+    try {
+      return api.create(changes.parse(TopLevelResource.INSTANCE, IdString.fromUrl(id)));
+    } catch (Exception e) {
+      throw asRestApiException("Cannot parse change", e);
+    }
+  }
+
+  @Override
+  public ChangeApi id(String project, int id) throws RestApiException {
+    return id(
+        Joiner.on('~').join(ImmutableList.of(Url.encode(project), Url.encode(String.valueOf(id)))));
+  }
+
+  @Override
+  public ChangeApi create(ChangeInput in) throws RestApiException {
+    try {
+      ChangeInfo out = createChange.apply(TopLevelResource.INSTANCE, in).value();
+      return api.create(changes.parse(new Change.Id(out._number)));
+    } catch (Exception e) {
+      throw asRestApiException("Cannot create change", e);
+    }
+  }
+
+  @Override
+  public QueryRequest query() {
+    return new QueryRequest() {
+      @Override
+      public List<ChangeInfo> get() throws RestApiException {
+        return ChangesImpl.this.get(this);
+      }
+    };
+  }
+
+  @Override
+  public QueryRequest query(String query) {
+    return query().withQuery(query);
+  }
+
+  private List<ChangeInfo> get(QueryRequest q) throws RestApiException {
+    QueryChanges qc = queryProvider.get();
+    if (q.getQuery() != null) {
+      qc.addQuery(q.getQuery());
+    }
+    qc.setLimit(q.getLimit());
+    qc.setStart(q.getStart());
+    for (ListChangesOption option : q.getOptions()) {
+      qc.addOption(option);
+    }
+
+    try {
+      List<?> result = qc.apply(TopLevelResource.INSTANCE);
+      if (result.isEmpty()) {
+        return ImmutableList.of();
+      }
+
+      // Check type safety of result; the extension API should be safer than the
+      // REST API in this case, since it's intended to be used in Java.
+      Object first = requireNonNull(result.iterator().next());
+      checkState(first instanceof ChangeInfo);
+      @SuppressWarnings("unchecked")
+      List<ChangeInfo> infos = (List<ChangeInfo>) result;
+
+      return ImmutableList.copyOf(infos);
+    } catch (Exception e) {
+      throw asRestApiException("Cannot query changes", e);
+    }
+  }
+}