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GraphQLContext.java
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157 lines (134 loc) · 4.15 KB
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package graphql;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.stream.Stream;
import static graphql.Assert.assertNotNull;
/**
* This context object can be used to contain key values that can be useful as "context" when executing
* {@link graphql.schema.DataFetcher}s
*
* <pre>
* {@code
* DataFetcher df = new DataFetcher() {
* public Object get(DataFetchingEnvironment env) {
* GraphQLContext ctx = env.getContext()
* User currentUser = ctx.getOrDefault("userKey",new AnonymousUser())
* ...
* }
* }
* }
* </pre>
*
* You can set this up via {@link ExecutionInput.Builder#context(graphql.GraphQLContext.Builder)}
*/
@PublicApi
@ThreadSafe
@SuppressWarnings("unchecked")
public class GraphQLContext {
private final ConcurrentMap<Object, Object> map;
private GraphQLContext(ConcurrentMap<Object, Object> map) {
this.map = map;
}
public void delete(Object key) {
map.remove(assertNotNull(key));
}
public <T> T get(Object key) {
return (T) map.get(assertNotNull(key));
}
public <T> T getOrDefault(Object key, T defaultValue) {
return (T) map.getOrDefault(assertNotNull(key), defaultValue);
}
public <T> Optional<T> getOrEmpty(Object key) {
T t = (T) map.get(assertNotNull(key));
return Optional.ofNullable(t);
}
public boolean hasKey(Object key) {
return map.containsKey(assertNotNull(key));
}
public void put(Object key, Object value) {
map.put(assertNotNull(key), assertNotNull(value));
}
public void putAll(GraphQLContext context) {
assertNotNull(context);
for (Map.Entry<Object, Object> entry : context.map.entrySet()) {
put(entry.getKey(), entry.getValue());
}
}
public Stream<Map.Entry<Object, Object>> stream() {
return map.entrySet().stream();
}
public static Builder newContext() {
return new Builder();
}
public static class Builder {
private final ConcurrentMap<Object, Object> map = new ConcurrentHashMap<>();
public Builder of(
Object key1, Object value1
) {
return putImpl(
key1, value1
);
}
public Builder of(
Object key1, Object value1,
Object key2, Object value2
) {
return putImpl(
key1, value1,
key2, value2
);
}
public Builder of(
Object key1, Object value1,
Object key2, Object value2,
Object key3, Object value3
) {
return putImpl(
key1, value1,
key2, value2,
key3, value3
);
}
public Builder of(
Object key1, Object value1,
Object key2, Object value2,
Object key3, Object value3,
Object key4, Object value4
) {
return putImpl(
key1, value1,
key2, value2,
key3, value3,
key4, value4
);
}
public Builder of(
Object key1, Object value1,
Object key2, Object value2,
Object key3, Object value3,
Object key4, Object value4,
Object key5, Object value5
) {
return putImpl(
key1, value1,
key2, value2,
key3, value3,
key4, value4,
key5, value5
);
}
private Builder putImpl(Object... kvs) {
for (int i = 0; i < kvs.length; i = i + 2) {
Object k = kvs[i];
Object v = kvs[i + 1];
map.put(assertNotNull(k), assertNotNull(v));
}
return this;
}
public GraphQLContext build() {
return new GraphQLContext(map);
}
}
}