<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en"><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/><link rel="stylesheet" href="../../jacoco-resources/report.css" type="text/css"/><link rel="shortcut icon" href="../../jacoco-resources/report.gif" type="image/gif"/><title>Key.java</title><link rel="stylesheet" href="../../jacoco-resources/prettify.css" type="text/css"/><script type="text/javascript" src="../../jacoco-resources/prettify.js"></script></head><body onload="window['PR_TAB_WIDTH']=4;prettyPrint()"><div class="breadcrumb" id="breadcrumb"><span class="info"><a href="../../jacoco-sessions.html" class="el_session">Sessions</a></span><a href="../../index.html" class="el_report">TheseFoolishThings :: Examples :: DCI :: Persistence JPA</a> > <a href="../index.html" class="el_bundle">it-tidalwave-util</a> > <a href="index.source.html" class="el_package">it.tidalwave.util</a> > <span class="el_source">Key.java</span></div><h1>Key.java</h1><pre class="source lang-java linenums">/*
* *********************************************************************************************************************
*
* TheseFoolishThings: Miscellaneous utilities
* http://tidalwave.it/projects/thesefoolishthings
*
* Copyright (C) 2009 - 2023 by Tidalwave s.a.s. (http://tidalwave.it)
*
* *********************************************************************************************************************
*
* Licensed 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.
*
* *********************************************************************************************************************
*
* git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
* git clone https://github.com/tidalwave-it/thesefoolishthings-src
*
* *********************************************************************************************************************
*/
package it.tidalwave.util;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import java.util.Comparator;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
import java.io.Serializable;
import it.tidalwave.util.annotation.VisibleForTesting;
import lombok.AccessLevel;
import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.RequiredArgsConstructor;
import lombok.ToString;
/***********************************************************************************************************************
*
* @author Fabrizio Giudici
* @since 1.11.0
* @stereotype flyweight
*
**********************************************************************************************************************/
<span class="pc bpc" id="L50" title="13 of 26 branches missed.">@Immutable @RequiredArgsConstructor(access = AccessLevel.PRIVATE) @EqualsAndHashCode @ToString</span>
public class Key<T> implements StringValue, Comparable<Key<?>>, Serializable
{
private static final long serialVersionUID = 2817490298518793579L;
// FIXME: a Set would be enough.
a Set would be enough.
<span class="fc" id="L56"> @VisibleForTesting static final ConcurrentHashMap<Key<?>, Key<?>> INSTANCES = new ConcurrentHashMap<>();</span>
<span class="fc" id="L58"> @Getter @Nonnull</span>
private final String name;
<span class="fc" id="L61"> @Getter @Nonnull</span>
private final Class<T> type;
/*******************************************************************************************************************
*
* Create a new instance with the given name.
*
* @param name the name
* @deprecated use {@link #of(String, Class)}
*
******************************************************************************************************************/
@Deprecated
public Key (@Nonnull final String name)
<span class="fc" id="L74"> {</span>
<span class="fc" id="L75"> this.name = name;</span>
<span class="fc" id="L76"> type = (Class<T>)ReflectionUtils.getTypeArguments(Key.class, getClass()).get(0);</span>
<span class="fc" id="L77"> }</span>
/*******************************************************************************************************************
*
* Creates an instance with the given name and type. If an identical key already exists, that existing instance is
* returned. It is allowed to have two keys with the same name and different types (e.g. {@code Key.of("foo",
* String.class)} and {@code Key.of("foo", Integer.class)}): they are considered as two distinct keys. This feature
* allows to treat the same data both as typed and type-agnostic at the same time; for instance, a collection of
* properties could be read from a configuration file in type-agnostic way (if there is no type information in
* the file) and later managed as typed only when needed.
*
* @param <T> the static type
* @param name the name
* @param type the dynamic type
* @return the key
* @since 3.2-ALPHA-2
*
******************************************************************************************************************/
@Nonnull @SuppressWarnings("unchecked")
public static <T> Key<T> of (@Nonnull final String name, @Nonnull final Class<T> type)
{
<span class="fc" id="L98"> final var newKey = new Key<T>(name, type);</span>
<span class="fc" id="L99"> final var key = (Key<T>)INSTANCES.putIfAbsent(newKey, newKey);</span>
<span class="fc bfc" id="L100" title="All 2 branches covered."> return key != null ? key : newKey;</span>
}
/*******************************************************************************************************************
*
* Creates an instance with the given name. Type is considered as unknown (and assumed as {@link Object}). Please
* see {@link #of(String, Class)} for more information.
*
* @param name the name
* @return the key
* @since 3.2-ALPHA-4
*
******************************************************************************************************************/
@Nonnull
public static Key<Object> of (@Nonnull final String name)
{
<span class="nc" id="L116"> return of(name, Object.class);</span>
}
/*******************************************************************************************************************
*
* Returns all the keys registered in the system.
*
* @return a mutable and sorted set of keys.
* @since 3.2-ALPHA-2
*
******************************************************************************************************************/
@Nonnull
public static Set<Key<?>> allKeys()
{
<span class="fc" id="L130"> return new TreeSet<>(INSTANCES.values());</span>
}
/*******************************************************************************************************************
*
* Create a new instance with the given name.
*
* @param name the name
* @deprecated use {@link #of(String, Class)}
*
******************************************************************************************************************/
public Key (@Nonnull final StringValue name)
{
<span class="nc" id="L143"> this(name.stringValue());</span>
<span class="nc" id="L144"> }</span>
/*******************************************************************************************************************
*
* {@inheritDoc}
*
******************************************************************************************************************/
@Override @Nonnull
public String stringValue()
{
<span class="nc" id="L154"> return name;</span>
}
/*******************************************************************************************************************
*
* {@inheritDoc}
*
******************************************************************************************************************/
@Override
public int compareTo (@Nonnull final Key<?> other)
{
<span class="fc" id="L165"> final Comparator<Key<?>> byType = Comparator.comparing(k -> k.getType().getName());</span>
<span class="fc" id="L166"> final Comparator<Key<?>> byName = Comparator.comparing(Key::getName);</span>
<span class="fc" id="L167"> return byName.thenComparing(byType).compare(this, other);</span>
}
}
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