| 1 | /* |
| 2 | * jDTAUS Core API |
| 3 | * Copyright (C) 2005 Christian Schulte |
| 4 | * <cs@schulte.it> |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | * |
| 20 | */ |
| 21 | package org.jdtaus.core.container; |
| 22 | |
| 23 | import java.io.ObjectStreamException; |
| 24 | import java.io.Serializable; |
| 25 | import java.util.Map; |
| 26 | import java.util.TreeMap; |
| 27 | |
| 28 | /** |
| 29 | * Specification meta-data. |
| 30 | * <p>A specification consists of the properties {@code identifier}, |
| 31 | * {@code vendor}, {@code description} and {@code version}. Property |
| 32 | * {@code identifier} holds an identifier uniquely identifying the specification |
| 33 | * in a set of specifications. Property {@code vendor} holds vendor information |
| 34 | * for the vendor providing the specification. Property {@code description} |
| 35 | * holds a textual description and property {@code version} holds a textual |
| 36 | * version of the specification. The {@code stateless} flag indicates that state |
| 37 | * does not need to be retained across operations for instances to operate as |
| 38 | * specified. Property {@code multiplicity} specifies the number of |
| 39 | * implementations allowed to exist among a set of modules. A specification with |
| 40 | * {@code MULTIPLICITY_ONE} specifies that exactly one implementation of the |
| 41 | * specification must exist among a set of modules. A specification with |
| 42 | * {@code MULTIPLICITY_MANY} specifies that multiple implementations of the |
| 43 | * specification are allowed to exist among a set of modules (including none). |
| 44 | * Property {@code scope} specifies the scope the specification applies to. |
| 45 | * In multiton scope, a new instance is created whenever requested. In context |
| 46 | * scope, instances are bound to a system's context. An instance is only created |
| 47 | * if not already available in context. In singleton scope, instances are bound |
| 48 | * to a system's single instance store. An instance is only created if not |
| 49 | * already available in that single instance store.</p> |
| 50 | * |
| 51 | * @author <a href="mailto:cs@schulte.it">Christian Schulte</a> |
| 52 | * @version $JDTAUS: Specification.java 8743 2012-10-07 03:06:20Z schulte $ |
| 53 | */ |
| 54 | public class Specification extends ModelObject |
| 55 | implements Cloneable, Serializable |
| 56 | { |
| 57 | //--Constants--------------------------------------------------------------- |
| 58 | |
| 59 | /** |
| 60 | * Constant for property {@code multiplicity}. |
| 61 | * <p>A specification with {@code MULTIPLICITY_ONE} specifies that exactly |
| 62 | * one implementation of the specification must exist among a set of |
| 63 | * modules.</p> |
| 64 | */ |
| 65 | public static final int MULTIPLICITY_ONE = 25000; |
| 66 | |
| 67 | /** |
| 68 | * Constant for property {@code multiplicity}. |
| 69 | * <p>A specification with {@code MULTIPLICITY_MANY} specifies that multiple |
| 70 | * implementations of the specification are allowed to exist among a set of |
| 71 | * modules (including none).</p> |
| 72 | */ |
| 73 | public static final int MULTIPLICITY_MANY = 25001; |
| 74 | |
| 75 | /** |
| 76 | * Constant for property {@code scope}. |
| 77 | * <p>In multiton scope, a new instance is created whenever requested.</p> |
| 78 | */ |
| 79 | public static final int SCOPE_MULTITON = 26000; |
| 80 | |
| 81 | /** |
| 82 | * Constant for property {@code scope}. |
| 83 | * <p>In context scope, instances are bound to a system's context. An |
| 84 | * instance is only created if not already available in context.</p> |
| 85 | */ |
| 86 | public static final int SCOPE_CONTEXT = 26001; |
| 87 | |
| 88 | /** |
| 89 | * Constant for property {@code scope}. |
| 90 | * <p>In singleton scope, instances are bound to a system's single instance |
| 91 | * store. An instance is only created if not already available in that |
| 92 | * single instance store.</p> |
| 93 | */ |
| 94 | public static final int SCOPE_SINGLETON = 26002; |
| 95 | |
| 96 | /** Serial version UID for backwards compatibility with 1.0.x classes. */ |
| 97 | private static final long serialVersionUID = -1829249262406961967L; |
| 98 | |
| 99 | //---------------------------------------------------------------Constants-- |
| 100 | //--Specification----------------------------------------------------------- |
| 101 | |
| 102 | /** |
| 103 | * The name of the module holding the specification. |
| 104 | * @serial |
| 105 | */ |
| 106 | private String moduleName; |
| 107 | |
| 108 | /** |
| 109 | * The description of the specification. |
| 110 | * @serial |
| 111 | * @deprecated Replaced by property {@code documentation}. |
| 112 | */ |
| 113 | private String description; |
| 114 | |
| 115 | /** |
| 116 | * The identifier of the specification. |
| 117 | * @serial |
| 118 | */ |
| 119 | private String identifier; |
| 120 | |
| 121 | /** |
| 122 | * The flag indicating that instances of implementations of the |
| 123 | * specification should be created using a singleton strategy. |
| 124 | * @serial |
| 125 | * @deprecated Replaced by {@link #scope}. |
| 126 | */ |
| 127 | private boolean singleton; |
| 128 | |
| 129 | /** |
| 130 | * The vendor of the specification. |
| 131 | * @serial |
| 132 | */ |
| 133 | private String vendor; |
| 134 | |
| 135 | /** |
| 136 | * The version of the specification. |
| 137 | * @serial |
| 138 | */ |
| 139 | private String version; |
| 140 | |
| 141 | /** |
| 142 | * The implementation multiplicity of the specification. |
| 143 | * @serial |
| 144 | */ |
| 145 | private int multiplicity = MULTIPLICITY_MANY; |
| 146 | |
| 147 | /** |
| 148 | * The scope the specification applies to. |
| 149 | * @serial |
| 150 | */ |
| 151 | private int scope = SCOPE_MULTITON; |
| 152 | |
| 153 | /** |
| 154 | * The flag indicating if state need not be retained across method |
| 155 | * invocations for implementations to operate as specified. |
| 156 | * @serial |
| 157 | */ |
| 158 | private boolean stateless; |
| 159 | |
| 160 | /** |
| 161 | * The implementations available for the specification. |
| 162 | * @serial |
| 163 | */ |
| 164 | private Implementations implementations; |
| 165 | |
| 166 | /** |
| 167 | * Maps implementation names to implementations. |
| 168 | * @serial |
| 169 | */ |
| 170 | private final Map implementationNames = new TreeMap(); |
| 171 | |
| 172 | /** |
| 173 | * The properties of the specification. |
| 174 | * @serial |
| 175 | */ |
| 176 | private Properties properties; |
| 177 | |
| 178 | /** Creates a new {@code Specification} instance. */ |
| 179 | public Specification() |
| 180 | { |
| 181 | super(); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Gets the name of the module holding the specification. |
| 186 | * |
| 187 | * @return the name of the module holding the specification. |
| 188 | */ |
| 189 | public String getModuleName() |
| 190 | { |
| 191 | if ( this.moduleName == null ) |
| 192 | { |
| 193 | this.moduleName = ""; |
| 194 | } |
| 195 | |
| 196 | return this.moduleName; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Setter for property {@code moduleName}. |
| 201 | * |
| 202 | * @param value the new name of the module holding the specification. |
| 203 | */ |
| 204 | public void setModuleName( final String value ) |
| 205 | { |
| 206 | this.moduleName = value; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Gets the description of the specification. |
| 211 | * |
| 212 | * @return the description of the specification or {@code null}. |
| 213 | * |
| 214 | * @deprecated Replaced by {@link #getDocumentation() getDocumentation().getValue()}. |
| 215 | */ |
| 216 | public String getDescription() |
| 217 | { |
| 218 | return this.getDocumentation().getValue(); |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Setter for property {@code description}. |
| 223 | * |
| 224 | * @param value the new description of the specification. |
| 225 | * @deprecated Replaced by {@link #getDocumentation() getDocumentation().setValue(value)}. |
| 226 | */ |
| 227 | public void setDescription( final String value ) |
| 228 | { |
| 229 | this.getDocumentation().setValue( value ); |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Gets the identifier of the specification. |
| 234 | * |
| 235 | * @return the unique identifier of the specification. |
| 236 | */ |
| 237 | public String getIdentifier() |
| 238 | { |
| 239 | if ( this.identifier == null ) |
| 240 | { |
| 241 | this.identifier = ""; |
| 242 | } |
| 243 | |
| 244 | return this.identifier; |
| 245 | } |
| 246 | |
| 247 | /** |
| 248 | * Setter for property {@code identifier}. |
| 249 | * |
| 250 | * @param value the new identifier of the specification. |
| 251 | */ |
| 252 | public void setIdentifier( final String value ) |
| 253 | { |
| 254 | this.identifier = value; |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Gets the flag indicating the instantiation strategy of the specification. |
| 259 | * |
| 260 | * @return {@code true} if the specification is specifying a singleton; |
| 261 | * {@code false} if not. |
| 262 | * |
| 263 | * @see PropertyOverwriteConstraintException |
| 264 | * @deprecated Replaced by {@link #getScope() getScope() == SCOPE_SINGLETON}. |
| 265 | */ |
| 266 | public boolean isSingleton() |
| 267 | { |
| 268 | return this.getScope() == SCOPE_SINGLETON; |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * Setter for property {@code singleton}. |
| 273 | * |
| 274 | * @param value {@code true} to flag the specification as a singleton; |
| 275 | * {@code false} to not flag the specification as a singleton. |
| 276 | * |
| 277 | * @see PropertyOverwriteConstraintException |
| 278 | * @deprecated Replaced by {@link #setScope(int) setScope(value ? SCOPE_SINGLETON : SCOPE_MULTITON)}. |
| 279 | */ |
| 280 | public void setSingleton( final boolean value ) |
| 281 | { |
| 282 | this.scope = value ? SCOPE_SINGLETON : SCOPE_MULTITON; |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * Gets the scope the specification applies to. |
| 287 | * |
| 288 | * @return scope the specification applies to. |
| 289 | * |
| 290 | * @see #SCOPE_MULTITON |
| 291 | * @see #SCOPE_CONTEXT |
| 292 | * @see #SCOPE_SINGLETON |
| 293 | * @see PropertyOverwriteConstraintException |
| 294 | */ |
| 295 | public int getScope() |
| 296 | { |
| 297 | return this.scope; |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * Setter for property {@code scope}. |
| 302 | * |
| 303 | * @param value new scope the specification applies to. |
| 304 | * |
| 305 | * @throws IllegalArgumentException if {@code value} is not equal to one of |
| 306 | * the constants {@code SCOPE_MULTITON}, {@code SCOPE_CONTEXT} or |
| 307 | * {@code SCOPE_SINGLETON}. |
| 308 | * |
| 309 | * @see #SCOPE_MULTITON |
| 310 | * @see #SCOPE_CONTEXT |
| 311 | * @see #SCOPE_SINGLETON |
| 312 | * @see PropertyOverwriteConstraintException |
| 313 | */ |
| 314 | public void setScope( final int value ) |
| 315 | { |
| 316 | if ( value != SCOPE_MULTITON && value != SCOPE_CONTEXT && |
| 317 | value != SCOPE_SINGLETON ) |
| 318 | { |
| 319 | throw new IllegalArgumentException( Integer.toString( value ) ); |
| 320 | } |
| 321 | |
| 322 | this.scope = value; |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * Gets the flag indicating if state need not be retained across method |
| 327 | * invocations for implementations to operate as specified. |
| 328 | * |
| 329 | * @return {@code true} if state need not be retained across method |
| 330 | * invocations for implementations to operate as specified; {@code false} if |
| 331 | * state must be retained across method invocations for implementations |
| 332 | * to operate as specified. |
| 333 | */ |
| 334 | public boolean isStateless() |
| 335 | { |
| 336 | return this.stateless; |
| 337 | } |
| 338 | |
| 339 | /** |
| 340 | * Setter for property {@code stateless}. |
| 341 | * |
| 342 | * @param value {@code true} if state need not be retained across method |
| 343 | * invocations for implementations to operate as specified; {@code false} if |
| 344 | * state must be retained across method invocations for implementations to |
| 345 | * operate as specified. |
| 346 | */ |
| 347 | public void setStateless( final boolean value ) |
| 348 | { |
| 349 | this.stateless = value; |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * Gets the implementation multiplicity of the specification. |
| 354 | * |
| 355 | * @return one of the constants {@code MULTIPLICITY_ONE} or |
| 356 | * {@code MULTIPLICITY_MANY}. |
| 357 | * |
| 358 | * @see #MULTIPLICITY_ONE |
| 359 | * @see #MULTIPLICITY_MANY |
| 360 | * @see MultiplicityConstraintException |
| 361 | */ |
| 362 | public int getMultiplicity() |
| 363 | { |
| 364 | return this.multiplicity; |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * Setter for property {@code multiplicity}. |
| 369 | * |
| 370 | * @param value the new implementation multiplicity of the specification. |
| 371 | * |
| 372 | * @throws IllegalArgumentException if {@code value} is not equal to one of |
| 373 | * the constants {@code MULTIPLICITY_ONE} or {@code MULTIPLICITY_MANY}. |
| 374 | * @throws MultiplicityConstraintException if {@code value} equals |
| 375 | * {@code MULTIPLICITY_ONE} and the specification currently has more than |
| 376 | * one implementation defined. |
| 377 | * |
| 378 | * @see #MULTIPLICITY_ONE |
| 379 | * @see #MULTIPLICITY_MANY |
| 380 | */ |
| 381 | public void setMultiplicity( final int value ) |
| 382 | { |
| 383 | if ( value != MULTIPLICITY_ONE && value != MULTIPLICITY_MANY ) |
| 384 | { |
| 385 | throw new IllegalArgumentException( Integer.toString( value ) ); |
| 386 | } |
| 387 | if ( value == MULTIPLICITY_ONE && this.getImplementations().size() > 1 ) |
| 388 | { |
| 389 | throw new MultiplicityConstraintException( this.getIdentifier() ); |
| 390 | } |
| 391 | |
| 392 | this.multiplicity = value; |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * Gets the vendor of the specification. |
| 397 | * |
| 398 | * @return the vendor of the specification. |
| 399 | */ |
| 400 | public String getVendor() |
| 401 | { |
| 402 | if ( this.vendor == null ) |
| 403 | { |
| 404 | this.vendor = ""; |
| 405 | } |
| 406 | |
| 407 | return this.vendor; |
| 408 | } |
| 409 | |
| 410 | /** |
| 411 | * Setter for property {@code vendor}. |
| 412 | * |
| 413 | * @param value the new vendor of the specification. |
| 414 | */ |
| 415 | public void setVendor( final String value ) |
| 416 | { |
| 417 | this.vendor = value; |
| 418 | } |
| 419 | |
| 420 | /** |
| 421 | * Gets the version of the specification. |
| 422 | * |
| 423 | * @return the version of the specification or {@code null}. |
| 424 | */ |
| 425 | public String getVersion() |
| 426 | { |
| 427 | return this.version; |
| 428 | } |
| 429 | |
| 430 | /** |
| 431 | * Setter for property {@code version}. |
| 432 | * |
| 433 | * @param value the new version of the specification. |
| 434 | */ |
| 435 | public void setVersion( final String value ) |
| 436 | { |
| 437 | this.version = value; |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Gets an implementation for a name. |
| 442 | * |
| 443 | * @param name the name of the implementation to return. |
| 444 | * |
| 445 | * @return a reference to the implementation named {@code name}. |
| 446 | * |
| 447 | * @throws NullPointerException if {@code name} is {@code null}. |
| 448 | * @throws MissingImplementationException if no implementation matching |
| 449 | * {@code name} exists. |
| 450 | */ |
| 451 | public Implementation getImplementation( final String name ) |
| 452 | { |
| 453 | if ( name == null ) |
| 454 | { |
| 455 | throw new NullPointerException( "name" ); |
| 456 | } |
| 457 | |
| 458 | final Implementation ret = |
| 459 | (Implementation) this.implementationNames.get( name ); |
| 460 | |
| 461 | if ( ret == null ) |
| 462 | { |
| 463 | throw new MissingImplementationException( name ); |
| 464 | } |
| 465 | |
| 466 | return ret; |
| 467 | } |
| 468 | |
| 469 | /** |
| 470 | * Gets all available implementations of the specification. |
| 471 | * |
| 472 | * @return all available implementations of the specification. |
| 473 | */ |
| 474 | public Implementations getImplementations() |
| 475 | { |
| 476 | if ( this.implementations == null ) |
| 477 | { |
| 478 | this.implementations = new Implementations(); |
| 479 | } |
| 480 | |
| 481 | return this.implementations; |
| 482 | } |
| 483 | |
| 484 | /** |
| 485 | * Setter for property {@code implementations}. |
| 486 | * |
| 487 | * @param value the new implementations of the specification. |
| 488 | * |
| 489 | * @throws DuplicateImplementationException if {@code value} contains |
| 490 | * duplicate implementations. |
| 491 | * @throws MultiplicityConstraintException if the specification's |
| 492 | * multiplicity equals {@code MULTIPLICITY_ONE} and {@code value} contains |
| 493 | * no or more than one implementation. |
| 494 | */ |
| 495 | public void setImplementations( final Implementations value ) |
| 496 | { |
| 497 | if ( this.getMultiplicity() == MULTIPLICITY_ONE && value != null && |
| 498 | value.size() != 1 ) |
| 499 | { |
| 500 | throw new MultiplicityConstraintException( this.getIdentifier() ); |
| 501 | } |
| 502 | |
| 503 | this.implementationNames.clear(); |
| 504 | this.implementations = null; |
| 505 | |
| 506 | if ( value != null ) |
| 507 | { |
| 508 | for ( int i = value.size() - 1; i >= 0; i-- ) |
| 509 | { |
| 510 | if ( this.implementationNames.put( |
| 511 | value.getImplementation( i ).getName(), |
| 512 | value.getImplementation( i ) ) != null ) |
| 513 | { |
| 514 | this.implementationNames.clear(); |
| 515 | |
| 516 | throw new DuplicateImplementationException( |
| 517 | value.getImplementation( i ).getName() ); |
| 518 | |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | this.implementations = value; |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | /** |
| 527 | * Gets the properties of the specification. |
| 528 | * |
| 529 | * @return the properties of the specification. |
| 530 | */ |
| 531 | public Properties getProperties() |
| 532 | { |
| 533 | if ( this.properties == null ) |
| 534 | { |
| 535 | this.properties = new Properties(); |
| 536 | } |
| 537 | |
| 538 | return this.properties; |
| 539 | } |
| 540 | |
| 541 | /** |
| 542 | * Setter for property {@code properties}. |
| 543 | * |
| 544 | * @param value new properties of the specification. |
| 545 | */ |
| 546 | public void setProperties( final Properties value ) |
| 547 | { |
| 548 | this.properties = value; |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * Creates a string representing the properties of the instance. |
| 553 | * |
| 554 | * @return a string representing the properties of the instance. |
| 555 | */ |
| 556 | private String internalString() |
| 557 | { |
| 558 | final StringBuffer buf = new StringBuffer( 500 ).append( '{' ). |
| 559 | append( this.internalString( this ) ). |
| 560 | append( ", identifier=" ).append( this.identifier ). |
| 561 | append( ", moduleName=" ).append( this.moduleName ). |
| 562 | append( ", stateless=" ).append( this.stateless ). |
| 563 | append( ", multiplicity=" ). |
| 564 | append( this.multiplicity == MULTIPLICITY_ONE ? "one" : "many" ). |
| 565 | append( ", scope=" ).append( this.scope == SCOPE_MULTITON |
| 566 | ? "multiton" |
| 567 | : this.scope == SCOPE_CONTEXT |
| 568 | ? "context" |
| 569 | : "singleton" ). |
| 570 | append( ", vendor=" ).append( this.vendor ). |
| 571 | append( ", version=" ).append( this.version ). |
| 572 | append( ", properties=" ).append( this.getProperties() ). |
| 573 | append( ", implementations={" ); |
| 574 | |
| 575 | for ( int i = this.getImplementations().size() - 1; i >= 0; i-- ) |
| 576 | { |
| 577 | final Implementation impl = |
| 578 | this.getImplementations().getImplementation( i ); |
| 579 | |
| 580 | buf.append( "[" ).append( i ).append( "]=" ). |
| 581 | append( impl.getIdentifier() ).append( "@" ). |
| 582 | append( impl.getVersion() ); |
| 583 | |
| 584 | if ( i - 1 >= 0 ) |
| 585 | { |
| 586 | buf.append( ", " ); |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | buf.append( "}}" ); |
| 591 | return buf.toString(); |
| 592 | } |
| 593 | |
| 594 | //-----------------------------------------------------------Specification-- |
| 595 | //--Serializable------------------------------------------------------------ |
| 596 | |
| 597 | /** |
| 598 | * Takes care of initializing fields when constructed from an 1.0.x object |
| 599 | * stream. |
| 600 | * |
| 601 | * @throws ObjectStreamException if no scope can be resolved. |
| 602 | */ |
| 603 | private Object readResolve() throws ObjectStreamException |
| 604 | { |
| 605 | if ( this.scope == SCOPE_MULTITON && this.singleton ) |
| 606 | { |
| 607 | this.scope = SCOPE_SINGLETON; |
| 608 | } |
| 609 | if ( this.getDocumentation().getValue() == null && |
| 610 | this.description != null ) |
| 611 | { |
| 612 | this.getDocumentation().setValue( this.description ); |
| 613 | } |
| 614 | |
| 615 | return this; |
| 616 | } |
| 617 | |
| 618 | //------------------------------------------------------------Serializable-- |
| 619 | //--Object------------------------------------------------------------------ |
| 620 | |
| 621 | /** |
| 622 | * Returns a string representation of the object. |
| 623 | * |
| 624 | * @return a string representation of the object. |
| 625 | */ |
| 626 | public String toString() |
| 627 | { |
| 628 | return super.toString() + this.internalString(); |
| 629 | } |
| 630 | |
| 631 | /** |
| 632 | * Creates and returns a copy of this object. This method performs a |
| 633 | * "shallow copy" of this object, not a "deep copy" operation. |
| 634 | * |
| 635 | * @return a clone of this instance. |
| 636 | */ |
| 637 | public Object clone() |
| 638 | { |
| 639 | try |
| 640 | { |
| 641 | return super.clone(); |
| 642 | } |
| 643 | catch ( final CloneNotSupportedException e ) |
| 644 | { |
| 645 | throw new AssertionError( e ); |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | /** |
| 650 | * Indicates whether some other object is equal to this one by comparing |
| 651 | * properties {@code identifier} and {@code version}. |
| 652 | * |
| 653 | * @param o the reference object with which to compare. |
| 654 | * |
| 655 | * @return {@code true} if this object is the same as {@code o}; |
| 656 | * {@code false} otherwise. |
| 657 | */ |
| 658 | public final boolean equals( final Object o ) |
| 659 | { |
| 660 | boolean equal = o == this; |
| 661 | if ( !equal && o instanceof Specification ) |
| 662 | { |
| 663 | final Specification that = (Specification) o; |
| 664 | equal = this.getIdentifier().equals( that.getIdentifier() ) && |
| 665 | ( this.getVersion() == null ? that.getVersion() == null |
| 666 | : this.getVersion().equals( that.getVersion() ) ); |
| 667 | |
| 668 | } |
| 669 | |
| 670 | return equal; |
| 671 | } |
| 672 | |
| 673 | /** |
| 674 | * Returns a hash code value for this object. |
| 675 | * |
| 676 | * @return a hash code value for this object. |
| 677 | */ |
| 678 | public final int hashCode() |
| 679 | { |
| 680 | return this.getIdentifier().hashCode() + |
| 681 | ( this.getVersion() == null ? 0 : this.getVersion().hashCode() ); |
| 682 | |
| 683 | } |
| 684 | |
| 685 | //------------------------------------------------------------------Object-- |
| 686 | } |