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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.rankingexpression.evaluation;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* A context backed by a Map
*
* @author bratseth
*/
public class MapContext extends Context {
private Map<String,Value> bindings=new HashMap<>();
private boolean frozen = false;
public MapContext() {
}
/**
* Freezes this.
* Returns this for convenience.
*/
public MapContext freeze() {
if ( ! frozen)
bindings = Collections.unmodifiableMap(bindings);
return this;
}
/**
* Creates a map context from a map.
* The ownership of the map is transferred to this - it cannot be further modified by the caller.
* All the Values of the map will be frozen.
*/
public MapContext(Map<String,Value> bindings) {
this.bindings = bindings;
for (Value boundValue : bindings.values())
boundValue.freeze();
}
/**
* Returns the value of a key. 0 is returned if the given key is not bound in this.
*/
@Override
public Value get(String key) {
Value value=bindings.get(key);
if (value==null) return DoubleValue.zero;
return value;
}
/**
* Sets the value of a key.
* The value is frozen by this.
*
* @since 5.1.5
*/
@Override
public void put(String key,Value value) {
bindings.put(key,value.freeze());
}
/** Returns an immutable view of the bindings of this. */
public Map<String,Value> bindings() {
if (frozen) return bindings;
return Collections.unmodifiableMap(bindings);
}
/** Returns a new, modifiable context containing all the bindings of this */
public MapContext thawedCopy() { return new MapContext(new HashMap<>(bindings)); }
/** Returns an unmodifiable map of the names of this */
@Override
public Set<String> names() {
if (frozen) return bindings.keySet();
return Collections.unmodifiableMap(bindings).keySet();
}
@Override
public String toString() {
return "a map context [" + bindings.size() + " bindings]";
}
/**
* A convenience constructor which returns a map context from a string on the form
* <code>name1:value1, name2:value2 ...</code>.
* Extra spaces are allowed anywhere. Any other deviation from the syntax causes an exception to be thrown.
*/
public static MapContext fromString(String contextString) {
MapContext mapContext = new MapContext();
for (String keyValueString : contextString.split(",")) {
String[] strings = keyValueString.trim().split(":");
mapContext.put(strings[0].trim(), Value.parse(strings[1].trim()));
}
return mapContext;
}
}
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