com.hazelcast.shaded.org.apache.calcite.runtime.FunctionContexts Maven / Gradle / Ivy
/*
* 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.
*/
package com.hazelcast.shaded.org.apache.calcite.runtime;
import com.hazelcast.shaded.org.apache.calcite.DataContext;
import com.hazelcast.shaded.org.apache.calcite.rel.metadata.NullSentinel;
import com.hazelcast.shaded.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.shaded.org.apache.calcite.schema.FunctionContext;
import com.hazelcast.shaded.org.checkerframework.checker.nullness.qual.Nullable;
/**
* Runtime support for {@link com.hazelcast.shaded.org.apache.calcite.schema.FunctionContext}.
*/
public class FunctionContexts {
private FunctionContexts() {
}
/** Creates a FunctionContext. */
public static FunctionContext of(DataContext root, Object[] argumentValues) {
return new FunctionContextImpl(root, argumentValues);
}
/** Implementation of {@link com.hazelcast.shaded.org.apache.calcite.schema.FunctionContext}. */
private static class FunctionContextImpl implements FunctionContext {
private final DataContext root;
private final @Nullable Object[] argumentValues;
FunctionContextImpl(DataContext root, @Nullable Object[] argumentValues) {
this.root = root;
this.argumentValues = argumentValues;
}
@Override public RelDataTypeFactory getTypeFactory() {
return root.getTypeFactory();
}
@Override public int getParameterCount() {
return argumentValues.length;
}
@Override public boolean isArgumentConstant(int ordinal) {
return argumentValue(ordinal) != null;
}
private @Nullable Object argumentValue(int ordinal) {
if (ordinal < 0 || ordinal >= argumentValues.length) {
throw new IndexOutOfBoundsException("argument ordinal " + ordinal
+ " is out of range");
}
return argumentValues[ordinal];
}
@Override public @Nullable V getArgumentValueAs(int ordinal,
Class valueClass) {
final Object v = argumentValue(ordinal);
if (v == null) {
throw new IllegalArgumentException("value of argument " + ordinal
+ " is not constant");
}
if (v == NullSentinel.INSTANCE) {
return null; // value is constant NULL
}
if (valueClass == String.class
&& !(v instanceof String)) {
return valueClass.cast(v.toString());
}
return valueClass.cast(v);
}
}
}
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