/
Annotations.java
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/
Annotations.java
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/*
* Copyright 2018 Google LLC
*
* 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.cloud.bigquery;
import com.google.api.client.util.Data;
import com.google.auto.value.AutoValue;
import com.google.auto.value.extension.memoized.Memoized;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Nullable;
@AutoValue
abstract class Annotations implements Serializable {
private static final long serialVersionUID = 1L;
static final Annotations ZERO = of(Collections.<String, String>emptyMap());
@Nullable
abstract Map<String, String> userMap();
@Memoized
@Nullable
Map<String, String> toPb() {
Map<String, String> userMap = userMap();
if (userMap == null) {
// converted to JSON null
return Data.nullOf(HashMap.class);
}
if (userMap.isEmpty()) {
// dropped from JSON
return null;
}
HashMap<String, String> pbMap = new HashMap<>();
for (Map.Entry<String, String> entry : userMap.entrySet()) {
String key = entry.getKey();
String val = entry.getValue();
if (val == null) {
val = Data.NULL_STRING;
}
pbMap.put(key, val);
}
return Collections.unmodifiableMap(pbMap);
}
private static Annotations of(Map<String, String> userMap) {
Preconditions.checkArgument(
userMap == null || !userMap.containsKey(null), "null keys are not supported");
return new AutoValue_Annotations(userMap);
}
static Annotations fromUser(Map<String, String> map) {
if (map == null || map instanceof ImmutableMap) {
return of(map);
}
// Not ImmutableMap; we support null values!
return of(Collections.unmodifiableMap(new HashMap<>(map)));
}
static Annotations fromPb(Map<String, String> pb) {
if (Data.isNull(pb)) {
return of(null);
}
if (pb == null || pb.isEmpty()) {
return of(Collections.<String, String>emptyMap());
}
HashMap<String, String> map = new HashMap<>();
for (Map.Entry<String, String> entry : pb.entrySet()) {
String key = entry.getKey();
String val = entry.getValue();
if (Data.isNull(val)) {
val = null;
}
map.put(key, val);
}
return of(Collections.unmodifiableMap(map));
}
}