/
InjectorChain.java
77 lines (68 loc) · 2.52 KB
/
InjectorChain.java
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/*
* Copyright 2019 Confluent Inc.
*
* Licensed under the Confluent Community License (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.confluent.io/confluent-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package io.confluent.ksql.statement;
import com.google.common.collect.ImmutableList;
import io.confluent.ksql.parser.tree.Statement;
import java.util.ArrayList;
import java.util.List;
/**
* Encapsulates a chain of injectors, ordered, into a single entity.
*/
public final class InjectorChain implements InjectorWithSideEffects {
private final List<Injector> injectors;
public static InjectorChain of(final Injector... injectors) {
return new InjectorChain(injectors);
}
private InjectorChain(final Injector... injectors) {
this.injectors = ImmutableList.copyOf(injectors);
}
@Override
public <T extends Statement> ConfiguredStatement<T> inject(
final ConfiguredStatement<T> statement) {
ConfiguredStatement<T> injected = statement;
for (final Injector injector : injectors) {
injected = injector.inject(injected);
}
return injected;
}
@Override
public <T extends Statement> ConfiguredStatementWithSideEffects<T> injectWithSideEffects(
final ConfiguredStatement<T> statement
) {
ConfiguredStatement<T> injected = statement;
final List<Object> allSideEffects = new ArrayList<>();
for (final Injector injector : injectors) {
if (injector instanceof InjectorWithSideEffects) {
final ConfiguredStatementWithSideEffects<T> wse =
((InjectorWithSideEffects) injector).injectWithSideEffects(injected);
injected = wse.getStatement();
allSideEffects.addAll(wse.getSideEffects());
} else {
injected = injector.inject(injected);
}
}
return new ConfiguredStatementWithSideEffects<>(injected, allSideEffects);
}
@Override
public <T extends Statement> void revertSideEffects(
final ConfiguredStatementWithSideEffects<T> statement
) {
for (final Injector injector : injectors) {
if (injector instanceof InjectorWithSideEffects) {
((InjectorWithSideEffects) injector).revertSideEffects(statement);
}
}
}
}