org.glassfish.grizzly.attributes.DefaultAttributeBuilder Maven / Gradle / Ivy
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package org.glassfish.grizzly.attributes;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.glassfish.grizzly.utils.NullaryFunction;
/**
* Default {@link AttributeBuilder} implementation.
*
* @see AttributeBuilder
*
* @author Alexey Stashok
*/
public class DefaultAttributeBuilder implements AttributeBuilder {
protected final List attributes = new ArrayList();
protected final Map name2Attribute = new HashMap();
/**
* {@inheritDoc}
*/
@Override
public synchronized Attribute createAttribute(final String name) {
return createAttribute(name, (T) null);
}
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings("unchecked")
public synchronized Attribute createAttribute(final String name,
final T defaultValue) {
Attribute attribute = name2Attribute.get(name);
if (attribute == null) {
attribute = new Attribute(this, name, attributes.size(), defaultValue);
attributes.add(attribute);
name2Attribute.put(name, attribute);
}
return attribute;
}
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings("unchecked")
public synchronized Attribute createAttribute(final String name,
final NullaryFunction initializer) {
Attribute attribute = name2Attribute.get(name);
if (attribute == null) {
attribute = new Attribute(this, name, attributes.size(), initializer);
attributes.add(attribute);
name2Attribute.put(name, attribute);
}
return attribute;
}
@Override
public Attribute createAttribute(final String name,
final org.glassfish.grizzly.attributes.NullaryFunction initializer) {
return createAttribute(name, initializer == null ?
null :
new NullaryFunction() {
@Override
public T evaluate() {
return initializer.evaluate();
}
});
}
@Override
public AttributeHolder createSafeAttributeHolder() {
return new IndexedAttributeHolder(this);
}
@Override
public AttributeHolder createUnsafeAttributeHolder() {
return new UnsafeAttributeHolder(this);
}
protected Attribute getAttributeByName(final String name) {
return name2Attribute.get(name);
}
protected Attribute getAttributeByIndex(final int index) {
return attributes.get(index);
}
}