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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
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* exception as provided by Oracle in the GPL Version 2 section of the License
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*
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*/
package org.glassfish.admin.amx.util;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public final class MapUtil
{
private MapUtil()
{
// disallow instantiation
}
public static V getWithDefault(final Map m, final K key, V defaultValue)
{
return m.containsKey(key) ? m.get(key) : defaultValue;
}
public static Object[] getKeyObjects(final Map m)
{
final Object[] keys = new Object[m.keySet().size()];
m.keySet().toArray(keys);
return keys;
}
public static String[] getKeyStrings(final Map m)
{
return (SetUtil.toSortedStringArray(m.keySet()));
}
/** assignable to any map type, keeps things short on the rhs */
public static Map newMap()
{
return new HashMap();
}
/**
Create a new Map consisting of a single key/value pair.
*/
public static Map newMap(
final String key,
final V value)
{
final Map m = new HashMap();
m.put(key, value);
return (m);
}
/**
Create a new Map consisting of a single key/value pair.
*/
public static Map newMap(
final Map m1,
final Map m2)
{
final Map m = new HashMap();
if (m1 != null)
{
m.putAll(m1);
}
if (m2 != null)
{
m.putAll(m2);
}
return (m);
}
public static Map toMap(final Object[] params, final Class keyClass, final Class valueClass)
{
final Map m = new HashMap();
for (int i = 0; i < params.length; i += 2)
{
final Object key = params[i];
if (key == null)
{
throw new IllegalArgumentException();
}
if (!keyClass.isAssignableFrom(key.getClass()))
{
throw new IllegalArgumentException("Key of class " + key.getClass().getName() + " not assignable to " + keyClass.getName());
}
final Object value = params[i + 1];
if (value != null && !valueClass.isAssignableFrom(value.getClass()))
{
throw new IllegalArgumentException("Value of class " + value.getClass().getName() + " not assignable to " + valueClass.getName());
}
m.put(keyClass.cast(key), valueClass.cast(value));
}
return m;
}
/**
Create a new Map and insert the specified mappings as found in 'mappings'.
The even-numbered entries are the keys, and the odd-numbered entries are
the values.
*/
public static Map newMap(final T... mappings)
{
if ((mappings.length % 2) != 0)
{
throw new IllegalArgumentException("mappings must have even length");
}
final Map m = new HashMap();
for (int i = 0; i < mappings.length; i += 2)
{
m.put(mappings[i], mappings[i + 1]);
}
return (m);
}
/**
Create a new Map and insert the specified mappings as found in 'mappings'.
The even-numbered entries are the keys, and the odd-numbered entries are
the values.
*/
public static Map newMap(final String... mappings)
{
if ((mappings.length % 2) != 0)
{
throw new IllegalArgumentException("mappings must have even length");
}
final Map m = new HashMap();
for (int i = 0; i < mappings.length; i += 2)
{
m.put(mappings[i], mappings[i + 1]);
}
return (m);
}
/**
Remove all entries keyed by 'keys'
*/
public static void removeAll(
final Map m,
final T[] keys)
{
for (int i = 0; i < keys.length; ++i)
{
m.remove(keys[i]);
}
}
public static boolean mapsEqual(
final Map m1,
final Map m2)
{
if (m1 == m2)
{
return (true);
}
boolean equal = false;
if (m1.size() == m2.size() &&
m1.keySet().equals(m2.keySet()))
{
equal = true;
for (final Map.Entry me : m1.entrySet())
{
final Object key = me.getKey();
final Object value1 = me.getValue();
final Object value2 = m2.get(key);
if (!CompareUtil.objectsEqual(value1, value2))
{
equal = false;
break;
}
}
}
return (equal);
}
public static Map newMapNoNullValues(final Map m)
{
final Map result = new HashMap();
for (final Map.Entry me : m.entrySet())
{
final V value = me.getValue();
if (value != null)
{
result.put(me.getKey(), value);
}
}
return (result);
}
public static String toString(final Map m)
{
return (toString(m, ","));
}
public static String toString(final Map m, final String separator)
{
if (m == null)
{
return ("null");
}
final StringBuffer buf = new StringBuffer();
final String[] keyStrings = getKeyStrings(m);
for (final String key : keyStrings)
{
final Object value = m.get(key);
buf.append(key);
buf.append("=");
buf.append(StringUtil.toString(value));
buf.append(separator);
}
if (buf.length() != 0)
{
// strip trailing separator
buf.setLength(buf.length() - separator.length());
}
return (buf.toString());
}
public static Set getNullValueKeys(final Map m)
{
final Set s = new HashSet();
for (final Map.Entry me : m.entrySet())
{
if (me.getValue() == null)
{
s.add(me.getKey());
}
}
return (s);
}
public static Map toMap(final Properties props, final Class kClass, final Class vClass)
{
return TypeCast.checkMap(props, kClass, vClass);
}
public static void removeAll(final Map m, final Set s)
{
for (final K key : s)
{
m.remove(key);
}
}
/**
@return true if non-null Map and all keys and values are of type java.lang.String
*/
public static boolean isAllStrings(final Map m)
{
return m != null && CollectionUtil.isAllStrings(m.keySet()) &&
CollectionUtil.isAllStrings(m.values());
}
/**
Convert an arbitrary Map to one whose keys and values
are both of type String.
*/
public static Map toStringStringMap(final Map m)
{
if (m == null)
{
return null;
}
Map result;
if (isAllStrings(m))
{
result = TypeCast.asMap(m);
}
else
{
result = new HashMap();
for (final Map.Entry me : m.entrySet())
{
final Object key = me.getKey();
final Object value = me.getValue();
if ((key instanceof String) && (value instanceof String))
{
result.put((String) key, (String) value);
}
else
{
result.put("" + key, "" + value);
}
}
}
return result;
}
}