proguard.util.MultiValueMap Maven / Gradle / Ivy
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2018 GuardSquare NV
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.util;
import java.util.*;
/**
* A key-values map that can have multiple values associated with each key.
*
* There is an efficient lookup method to retrieve all values of all keys.
*
* @param the key type
* @param the value type
*
* @author Johan Leys
*/
public class MultiValueMap
{
private final Map> keyValueMap = new HashMap>();
private final Set values = new HashSet();
public void put(K key, V value)
{
putAll(key, Collections.singleton(value));
}
public void putAll(Set key, V value)
{
putAll(key, Collections.singleton(value));
}
public void putAll(Set keys, Set values)
{
for (K key : keys)
{
putAll(key, values);
}
}
public void putAll(K key, Set values)
{
this.values.addAll(values);
Set existingValues = keyValueMap.get(key);
if (existingValues == null)
{
existingValues = new HashSet();
keyValueMap.put(key, existingValues);
}
existingValues.addAll(values);
}
public Set get(K key)
{
return keyValueMap.get(key);
}
/**
* Returns a Set with all values of all keys.
*
* @return a Set with all values of all keys.
*/
public Set getValues()
{
return values;
}
}
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