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A module that is everything required to understands Druid Segments
/*
* 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 org.apache.druid.math.expr;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Maps;
import javax.annotation.Nullable;
import java.util.HashMap;
import java.util.Map;
/**
* Simple map backed object binding
*/
public class SettableObjectBinding implements Expr.ObjectBinding
{
private final Map bindings;
private Expr.InputBindingInspector inspector = InputBindings.nilBindings();
public SettableObjectBinding()
{
this.bindings = new HashMap<>();
}
public SettableObjectBinding(int expectedSize)
{
this.bindings = Maps.newHashMapWithExpectedSize(expectedSize);
}
@Nullable
@Override
public Object get(String name)
{
return bindings.get(name);
}
@Nullable
@Override
public ExpressionType getType(String name)
{
return inspector.getType(name);
}
public SettableObjectBinding withBinding(String name, @Nullable Object value)
{
bindings.put(name, value);
return this;
}
public SettableObjectBinding withInspector(Expr.InputBindingInspector inspector)
{
this.inspector = inspector;
return this;
}
@VisibleForTesting
public Map asMap()
{
return bindings;
}
}