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/**
* 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.datatorrent.api;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import com.google.common.base.Throwables;
/**
* Attribute represents the attribute which can be set on various components in the system.
*
* @param type of the value which can be stored against the attribute.
* @since 2.0.0
*/
public class Attribute implements Serializable
{
public final T defaultValue;
public final String name;
public final StringCodec codec;
public Attribute(StringCodec codec)
{
this(null, null, codec);
}
public Attribute(T defaultValue)
{
this(null, defaultValue, null);
}
public Attribute(T defaultValue, StringCodec codec)
{
this(null, defaultValue, codec);
}
private Attribute(String name, T defaultValue, StringCodec codec)
{
this.name = name;
this.defaultValue = defaultValue;
this.codec = codec;
}
@Override
public int hashCode()
{
return name.hashCode();
}
@Override
public boolean equals(Object obj)
{
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
@SuppressWarnings(value = "unchecked")
final Attribute other = (Attribute)obj;
return !((this.name == null) ? (other.name != null) : !this.name.equals(other.name));
}
public String getName()
{
return "attr" + name.substring(name.lastIndexOf('.'));
}
public String getSimpleName()
{
return name.substring(name.lastIndexOf('.') + 1);
}
@Override
public String toString()
{
return "Attribute{" + "defaultValue=" + defaultValue + ", name=" + name + ", codec=" + codec + '}';
}
private static final long serialVersionUID = 201310111904L;
/**
* Parameterized and scoped context attribute map that supports serialization.
* Derived from io.netty.util.AttributeMap
*
* @since 0.3.2
*/
public interface AttributeMap extends Cloneable
{
/**
* Return the attribute value for the given key. If the map does not have an
* entry for the key, null is returned.
*
* @param
* @param key
* @return AttributeValue
*/
T get(Attribute key);
/**
* Return true if value for an attribute is set. It returns false if the
* value for the attribute was never set.
*
* @param key attribute key
* @return true if the value for the attribute was set, false otherwise.
*/
boolean contains(Attribute key);
/**
* Assign value for a particular attributes.
*
* @param Type of the value
* @param key Attribute which is being assigned the value
* @param value Value which is being assigned.
* @return Previous value against the attribute or null if it was not assigned.
*/
T put(Attribute key, T value);
Set, Object>> entrySet();
/**
* Clone the current map.
* @return a shallow copy of this AtrributeMap.
* @throws java.lang.CloneNotSupportedException
*/
AttributeMap clone() throws CloneNotSupportedException;
/**
* DefaultAttributeMap is the default implementation of AttributeMap. It's backed by a map internally.
*/
class DefaultAttributeMap implements AttributeMap, Serializable
{
private HashMap, Object> map;
public DefaultAttributeMap()
{
this(new HashMap, Object>());
}
private DefaultAttributeMap(HashMap, Object> map)
{
super();
this.map = map;
}
@Override
@SuppressWarnings(value = "unchecked")
public T get(Attribute key)
{
return (T)map.get(key);
}
@Override
public String toString()
{
return this.map.toString();
}
@Override
@SuppressWarnings("unchecked")
public DefaultAttributeMap clone() throws CloneNotSupportedException
{
DefaultAttributeMap clone = (DefaultAttributeMap)super.clone();
clone.map = (HashMap, Object>)map.clone();
return clone;
}
@Override
@SuppressWarnings(value = "unchecked")
public T put(Attribute key, T value)
{
return (T)map.put(key, value);
}
@Override
public Set, Object>> entrySet()
{
return map.entrySet();
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (!(o instanceof DefaultAttributeMap)) {
return false;
}
DefaultAttributeMap that = (DefaultAttributeMap)o;
return !(map != null ? !map.equals(that.map) : that.map != null);
}
@Override
public int hashCode()
{
return map != null ? map.hashCode() : 0;
}
@Override
public boolean contains(Attribute key)
{
return map.containsKey(key);
}
private static final long serialVersionUID = 201306051022L;
}
/**
* This class inspects and initializes the attributes with their field names so that they can be used
* from properties files.
*
* Engine uses it internally to initialize the Interfaces that may have Attributes defined in them.
*/
class AttributeInitializer
{
static final HashMap, Set>> map = new HashMap<>();
public static Map, Object> getAllAttributes(Context context, Class clazz)
{
Map, Object> result = new HashMap<>();
try {
for (Field f: clazz.getDeclaredFields()) {
if (Modifier.isStatic(f.getModifiers()) && Attribute.class.isAssignableFrom(f.getType())) {
@SuppressWarnings(value = "unchecked")
Attribute
