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core/src/main/java/org/apache/calcite/adapter/jdbc/JdbcCorrelationDataContext.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to you 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. | ||
| */ | ||
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| package org.apache.calcite.adapter.jdbc; | ||
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| import org.apache.calcite.DataContext; | ||
| import org.apache.calcite.adapter.java.JavaTypeFactory; | ||
| import org.apache.calcite.linq4j.QueryProvider; | ||
| import org.apache.calcite.schema.SchemaPlus; | ||
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| import org.checkerframework.checker.nullness.qual.Nullable; | ||
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| public class JdbcCorrelationDataContext implements DataContext { | ||
| public final static int OFFSET= 10000; | ||
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| private final DataContext delegate; | ||
| private final Object[] parameters; | ||
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| public JdbcCorrelationDataContext(DataContext delegate, Object[] parameters) { | ||
| this.delegate = delegate; | ||
| this.parameters = parameters; | ||
| } | ||
| @Override | ||
| public @Nullable SchemaPlus getRootSchema() { | ||
| return delegate.getRootSchema(); | ||
| } | ||
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| @Override | ||
| public JavaTypeFactory getTypeFactory() { | ||
| return delegate.getTypeFactory(); | ||
| } | ||
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| @Override | ||
| public QueryProvider getQueryProvider() { | ||
| return delegate.getQueryProvider(); | ||
| } | ||
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| @Override | ||
| public @Nullable Object get(String name) { | ||
| if ( name.startsWith("?")) { | ||
| int index = Integer.parseInt(name.substring(1)); | ||
| if ( index >= OFFSET && index < OFFSET+parameters.length) { | ||
| return parameters[index-OFFSET]; | ||
| } | ||
| } | ||
| return delegate.get(name); | ||
| } | ||
| } |
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57 changes: 57 additions & 0 deletions
57
.../src/main/java/org/apache/calcite/adapter/jdbc/JdbcCorrelationDataContextBuilderImpl.java
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| @@ -0,0 +1,57 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to you 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. | ||
| */ | ||
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| package org.apache.calcite.adapter.jdbc; | ||
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| import com.google.common.collect.ImmutableList; | ||
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| import org.apache.calcite.DataContext; | ||
| import org.apache.calcite.adapter.enumerable.EnumerableRelImplementor; | ||
| import org.apache.calcite.linq4j.tree.BlockBuilder; | ||
| import org.apache.calcite.linq4j.tree.Expression; | ||
| import org.apache.calcite.linq4j.tree.Expressions; | ||
| import org.apache.calcite.linq4j.tree.Types; | ||
| import org.apache.calcite.rel.core.CorrelationId; | ||
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| import java.lang.reflect.Constructor; | ||
| import java.lang.reflect.Type; | ||
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| public class JdbcCorrelationDataContextBuilderImpl implements JdbcCorrelationDataContextBuilder { | ||
| private static final Constructor NEW = Types.lookupConstructor(JdbcCorrelationDataContext.class, DataContext.class, Object[].class); | ||
| private final ImmutableList.Builder<Expression> parameters = new ImmutableList.Builder<>(); | ||
| private int offset = JdbcCorrelationDataContext.OFFSET; | ||
| private final EnumerableRelImplementor implementor; | ||
| private final BlockBuilder builder; | ||
| private final Expression dataContext; | ||
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| public JdbcCorrelationDataContextBuilderImpl(EnumerableRelImplementor implementor,BlockBuilder builder, Expression dataContext) { | ||
| this.implementor = implementor; | ||
| this.builder = builder; | ||
| this.dataContext = dataContext; | ||
| } | ||
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| @Override | ||
| public int add(CorrelationId id, int ordinal, Type type) { | ||
| parameters.add(implementor.getCorrelVariableGetter(id.getName()).field(builder,ordinal,type)); | ||
| return offset++; | ||
| } | ||
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| public Expression build() { | ||
| return Expressions.new_(NEW,dataContext, | ||
| Expressions.newArrayInit(Object.class,1,parameters.build())); | ||
| } | ||
| } |
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