/*
 * Copyright (c) 2008, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

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 AttributeBuilder implementation.
Author:Alexey Stashok
See Also:
/** * Default {@link AttributeBuilder} implementation. * * @see AttributeBuilder * * @author Alexey Stashok */
public class DefaultAttributeBuilder implements AttributeBuilder { protected final List<Attribute> attributes = new ArrayList<>(); protected final Map<String, Attribute> name2Attribute = new HashMap<>();
{@inheritDoc}
/** * {@inheritDoc} */
@Override public synchronized <T> Attribute<T> createAttribute(final String name) { return createAttribute(name, (T) null); }
{@inheritDoc}
/** * {@inheritDoc} */
@Override @SuppressWarnings("unchecked") public synchronized <T> Attribute<T> createAttribute(final String name, final T defaultValue) { Attribute<T> 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}
/** * {@inheritDoc} */
@Override @SuppressWarnings("unchecked") public synchronized <T> Attribute<T> createAttribute(final String name, final NullaryFunction<T> initializer) { Attribute<T> 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 <T> Attribute<T> createAttribute(final String name, final org.glassfish.grizzly.attributes.NullaryFunction<T> initializer) { return createAttribute(name, initializer == null ? null : new NullaryFunction<T>() { @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); } }