001// License: GPL. For details, see LICENSE file. 002package org.openstreetmap.josm.gui.mappaint.mapcss; 003 004import java.lang.reflect.InvocationTargetException; 005import java.lang.reflect.Method; 006import java.text.MessageFormat; 007import java.util.Arrays; 008import java.util.Collection; 009import java.util.EnumSet; 010import java.util.Map; 011import java.util.Objects; 012import java.util.Set; 013import java.util.regex.Pattern; 014 015import org.openstreetmap.josm.Main; 016import org.openstreetmap.josm.actions.search.SearchCompiler.InDataSourceArea; 017import org.openstreetmap.josm.data.osm.Node; 018import org.openstreetmap.josm.data.osm.OsmPrimitive; 019import org.openstreetmap.josm.data.osm.OsmUtils; 020import org.openstreetmap.josm.data.osm.Relation; 021import org.openstreetmap.josm.data.osm.Tag; 022import org.openstreetmap.josm.data.osm.Way; 023import org.openstreetmap.josm.data.osm.visitor.paint.relations.MultipolygonCache; 024import org.openstreetmap.josm.gui.mappaint.Cascade; 025import org.openstreetmap.josm.gui.mappaint.ElemStyles; 026import org.openstreetmap.josm.gui.mappaint.Environment; 027import org.openstreetmap.josm.tools.CheckParameterUtil; 028import org.openstreetmap.josm.tools.Predicate; 029import org.openstreetmap.josm.tools.Predicates; 030import org.openstreetmap.josm.tools.Utils; 031 032public abstract class Condition { 033 034 public abstract boolean applies(Environment e); 035 036 public static Condition createKeyValueCondition(String k, String v, Op op, Context context, boolean considerValAsKey) { 037 switch (context) { 038 case PRIMITIVE: 039 if (KeyValueRegexpCondition.SUPPORTED_OPS.contains(op) && !considerValAsKey) 040 return new KeyValueRegexpCondition(k, v, op, false); 041 if (!considerValAsKey && op.equals(Op.EQ)) 042 return new SimpleKeyValueCondition(k, v); 043 return new KeyValueCondition(k, v, op, considerValAsKey); 044 case LINK: 045 if (considerValAsKey) 046 throw new MapCSSException("''considerValAsKey'' not supported in LINK context"); 047 if ("role".equalsIgnoreCase(k)) 048 return new RoleCondition(v, op); 049 else if ("index".equalsIgnoreCase(k)) 050 return new IndexCondition(v, op); 051 else 052 throw new MapCSSException( 053 MessageFormat.format("Expected key ''role'' or ''index'' in link context. Got ''{0}''.", k)); 054 055 default: throw new AssertionError(); 056 } 057 } 058 059 public static Condition createRegexpKeyRegexpValueCondition(String k, String v, Op op) { 060 return new RegexpKeyValueRegexpCondition(k, v, op); 061 } 062 063 public static Condition createKeyCondition(String k, boolean not, KeyMatchType matchType, Context context) { 064 switch (context) { 065 case PRIMITIVE: 066 return new KeyCondition(k, not, matchType); 067 case LINK: 068 if (matchType != null) 069 throw new MapCSSException("Question mark operator ''?'' and regexp match not supported in LINK context"); 070 if (not) 071 return new RoleCondition(k, Op.NEQ); 072 else 073 return new RoleCondition(k, Op.EQ); 074 075 default: throw new AssertionError(); 076 } 077 } 078 079 public static PseudoClassCondition createPseudoClassCondition(String id, boolean not, Context context) { 080 return PseudoClassCondition.createPseudoClassCondition(id, not, context); 081 } 082 083 public static ClassCondition createClassCondition(String id, boolean not, Context context) { 084 return new ClassCondition(id, not); 085 } 086 087 public static ExpressionCondition createExpressionCondition(Expression e, Context context) { 088 return new ExpressionCondition(e); 089 } 090 091 /** 092 * This is the operation that {@link KeyValueCondition} uses to match. 093 */ 094 public enum Op { 095 /** The value equals the given reference. */ 096 EQ, 097 /** The value does not equal the reference. */ 098 NEQ, 099 /** The value is greater than or equal to the given reference value (as float). */ 100 GREATER_OR_EQUAL, 101 /** The value is greater than the given reference value (as float). */ 102 GREATER, 103 /** The value is less than or equal to the given reference value (as float). */ 104 LESS_OR_EQUAL, 105 /** The value is less than the given reference value (as float). */ 106 LESS, 107 /** The reference is treated as regular expression and the value needs to match it. */ 108 REGEX, 109 /** The reference is treated as regular expression and the value needs to not match it. */ 110 NREGEX, 111 /** The reference is treated as a list separated by ';'. Spaces around the ; are ignored. 112 * The value needs to be equal one of the list elements. */ 113 ONE_OF, 114 /** The value needs to begin with the reference string. */ 115 BEGINS_WITH, 116 /** The value needs to end with the reference string. */ 117 ENDS_WITH, 118 /** The value needs to contain the reference string. */ 119 CONTAINS; 120 121 protected static final Set<Op> NEGATED_OPS = EnumSet.of(NEQ, NREGEX); 122 123 /** 124 * Evaluates a value against a reference string. 125 * @param testString The value. May be <code>null</code> 126 * @param prototypeString The reference string- 127 * @return <code>true</code> if and only if this operation matches for the given value/reference pair. 128 */ 129 public boolean eval(String testString, String prototypeString) { 130 if (testString == null && !NEGATED_OPS.contains(this)) 131 return false; 132 switch (this) { 133 case EQ: 134 return Objects.equals(testString, prototypeString); 135 case NEQ: 136 return !Objects.equals(testString, prototypeString); 137 case REGEX: 138 case NREGEX: 139 final boolean contains = Pattern.compile(prototypeString).matcher(testString).find(); 140 return REGEX.equals(this) ? contains : !contains; 141 case ONE_OF: 142 return testString != null && Arrays.asList(testString.split("\\s*;\\s*")).contains(prototypeString); 143 case BEGINS_WITH: 144 return testString != null && testString.startsWith(prototypeString); 145 case ENDS_WITH: 146 return testString != null && testString.endsWith(prototypeString); 147 case CONTAINS: 148 return testString != null && testString.contains(prototypeString); 149 } 150 151 float test_float; 152 try { 153 test_float = Float.parseFloat(testString); 154 } catch (NumberFormatException e) { 155 return false; 156 } 157 float prototype_float = Float.parseFloat(prototypeString); 158 159 switch (this) { 160 case GREATER_OR_EQUAL: 161 return test_float >= prototype_float; 162 case GREATER: 163 return test_float > prototype_float; 164 case LESS_OR_EQUAL: 165 return test_float <= prototype_float; 166 case LESS: 167 return test_float < prototype_float; 168 default: 169 throw new AssertionError(); 170 } 171 } 172 } 173 174 /** 175 * Context, where the condition applies. 176 */ 177 public enum Context { 178 /** 179 * normal primitive selector, e.g. way[highway=residential] 180 */ 181 PRIMITIVE, 182 183 /** 184 * link between primitives, e.g. relation >[role=outer] way 185 */ 186 LINK 187 } 188 189 /** 190 * Most common case of a KeyValueCondition, this is the basic key=value case. 191 * 192 * Extra class for performance reasons. 193 */ 194 public static class SimpleKeyValueCondition extends Condition { 195 /** 196 * The key to search for. 197 */ 198 public final String k; 199 /** 200 * The value to search for. 201 */ 202 public final String v; 203 204 /** 205 * Create a new SimpleKeyValueCondition. 206 * @param k The key 207 * @param v The value. 208 */ 209 public SimpleKeyValueCondition(String k, String v) { 210 this.k = k; 211 this.v = v; 212 } 213 214 @Override 215 public boolean applies(Environment e) { 216 return v.equals(e.osm.get(k)); 217 } 218 219 public Tag asTag() { 220 return new Tag(k, v); 221 } 222 223 @Override 224 public String toString() { 225 return '[' + k + '=' + v + ']'; 226 } 227 228 } 229 230 /** 231 * <p>Represents a key/value condition which is either applied to a primitive.</p> 232 * 233 */ 234 public static class KeyValueCondition extends Condition { 235 /** 236 * The key to search for. 237 */ 238 public final String k; 239 /** 240 * The value to search for. 241 */ 242 public final String v; 243 /** 244 * The key/value match operation. 245 */ 246 public final Op op; 247 /** 248 * If this flag is set, {@link #v} is treated as a key and the value is the value set for that key. 249 */ 250 public boolean considerValAsKey; 251 252 /** 253 * <p>Creates a key/value-condition.</p> 254 * 255 * @param k the key 256 * @param v the value 257 * @param op the operation 258 * @param considerValAsKey whether to consider {@code v} as another key and compare the values of key {@code k} and key {@code v}. 259 */ 260 public KeyValueCondition(String k, String v, Op op, boolean considerValAsKey) { 261 this.k = k; 262 this.v = v; 263 this.op = op; 264 this.considerValAsKey = considerValAsKey; 265 } 266 267 @Override 268 public boolean applies(Environment env) { 269 return op.eval(env.osm.get(k), considerValAsKey ? env.osm.get(v) : v); 270 } 271 272 public Tag asTag() { 273 return new Tag(k, v); 274 } 275 276 @Override 277 public String toString() { 278 return '[' + k + '\'' + op + '\'' + v + ']'; 279 } 280 } 281 282 public static class KeyValueRegexpCondition extends KeyValueCondition { 283 284 public final Pattern pattern; 285 protected static final Set<Op> SUPPORTED_OPS = EnumSet.of(Op.REGEX, Op.NREGEX); 286 287 public KeyValueRegexpCondition(String k, String v, Op op, boolean considerValAsKey) { 288 super(k, v, op, considerValAsKey); 289 CheckParameterUtil.ensureThat(!considerValAsKey, "considerValAsKey is not supported"); 290 CheckParameterUtil.ensureThat(SUPPORTED_OPS.contains(op), "Op must be REGEX or NREGEX"); 291 this.pattern = Pattern.compile(v); 292 } 293 294 protected boolean matches(Environment env) { 295 final String value = env.osm.get(k); 296 return value != null && pattern.matcher(value).find(); 297 } 298 299 @Override 300 public boolean applies(Environment env) { 301 if (Op.REGEX.equals(op)) { 302 return matches(env); 303 } else if (Op.NREGEX.equals(op)) { 304 return !matches(env); 305 } else { 306 throw new IllegalStateException(); 307 } 308 } 309 } 310 311 public static class RegexpKeyValueRegexpCondition extends KeyValueRegexpCondition { 312 313 public final Pattern keyPattern; 314 315 public RegexpKeyValueRegexpCondition(String k, String v, Op op) { 316 super(k, v, op, false); 317 this.keyPattern = Pattern.compile(k); 318 } 319 320 @Override 321 protected boolean matches(Environment env) { 322 for (Map.Entry<String, String> kv: env.osm.getKeys().entrySet()) { 323 if (keyPattern.matcher(kv.getKey()).find() && pattern.matcher(kv.getValue()).find()) { 324 return true; 325 } 326 } 327 return false; 328 } 329 } 330 331 public static class RoleCondition extends Condition { 332 public final String role; 333 public final Op op; 334 335 public RoleCondition(String role, Op op) { 336 this.role = role; 337 this.op = op; 338 } 339 340 @Override 341 public boolean applies(Environment env) { 342 String testRole = env.getRole(); 343 if (testRole == null) return false; 344 return op.eval(testRole, role); 345 } 346 } 347 348 public static class IndexCondition extends Condition { 349 public final String index; 350 public final Op op; 351 352 public IndexCondition(String index, Op op) { 353 this.index = index; 354 this.op = op; 355 } 356 357 @Override 358 public boolean applies(Environment env) { 359 if (env.index == null) return false; 360 if (index.startsWith("-")) { 361 return env.count != null && op.eval(Integer.toString(env.index - env.count), index); 362 } else { 363 return op.eval(Integer.toString(env.index + 1), index); 364 } 365 } 366 } 367 368 /** 369 * This defines how {@link KeyCondition} matches a given key. 370 */ 371 public enum KeyMatchType { 372 /** 373 * The key needs to be equal to the given label. 374 */ 375 EQ, 376 /** 377 * The key needs to have a true value (yes, ...) 378 * @see OsmUtils#isTrue(String) 379 */ 380 TRUE, 381 /** 382 * The key needs to have a false value (no, ...) 383 * @see OsmUtils#isFalse(String) 384 */ 385 FALSE, 386 /** 387 * The key needs to match the given regular expression. 388 */ 389 REGEX 390 } 391 392 /** 393 * <p>KeyCondition represent one of the following conditions in either the link or the 394 * primitive context:</p> 395 * <pre> 396 * ["a label"] PRIMITIVE: the primitive has a tag "a label" 397 * LINK: the parent is a relation and it has at least one member with the role 398 * "a label" referring to the child 399 * 400 * [!"a label"] PRIMITIVE: the primitive doesn't have a tag "a label" 401 * LINK: the parent is a relation but doesn't have a member with the role 402 * "a label" referring to the child 403 * 404 * ["a label"?] PRIMITIVE: the primitive has a tag "a label" whose value evaluates to a true-value 405 * LINK: not supported 406 * 407 * ["a label"?!] PRIMITIVE: the primitive has a tag "a label" whose value evaluates to a false-value 408 * LINK: not supported 409 * </pre> 410 */ 411 public static class KeyCondition extends Condition { 412 413 /** 414 * The key name. 415 */ 416 public final String label; 417 /** 418 * If we should negate the result of the match. 419 */ 420 public final boolean negateResult; 421 /** 422 * Describes how to match the label against the key. 423 * @see KeyMatchType 424 */ 425 public final KeyMatchType matchType; 426 /** 427 * A predicate used to match a the regexp against the key. Only used if the match type is regexp. 428 */ 429 public final Predicate<String> containsPattern; 430 431 /** 432 * Creates a new KeyCondition 433 * @param label The key name (or regexp) to use. 434 * @param negateResult If we should negate the result., 435 * @param matchType The match type. 436 */ 437 public KeyCondition(String label, boolean negateResult, KeyMatchType matchType) { 438 this.label = label; 439 this.negateResult = negateResult; 440 this.matchType = matchType == null ? KeyMatchType.EQ : matchType; 441 this.containsPattern = KeyMatchType.REGEX.equals(matchType) 442 ? Predicates.stringContainsPattern(Pattern.compile(label)) 443 : null; 444 } 445 446 @Override 447 public boolean applies(Environment e) { 448 switch(e.getContext()) { 449 case PRIMITIVE: 450 switch (matchType) { 451 case TRUE: 452 return e.osm.isKeyTrue(label) ^ negateResult; 453 case FALSE: 454 return e.osm.isKeyFalse(label) ^ negateResult; 455 case REGEX: 456 return Utils.exists(e.osm.keySet(), containsPattern) ^ negateResult; 457 default: 458 return e.osm.hasKey(label) ^ negateResult; 459 } 460 case LINK: 461 Utils.ensure(false, "Illegal state: KeyCondition not supported in LINK context"); 462 return false; 463 default: throw new AssertionError(); 464 } 465 } 466 467 /** 468 * Get the matched key and the corresponding value. 469 * <p> 470 * WARNING: This ignores {@link #negateResult}. 471 * <p> 472 * WARNING: For regexp, the regular expression is returned instead of a key if the match failed. 473 * @param p The primitive to get the value from. 474 * @return The tag. 475 */ 476 public Tag asTag(OsmPrimitive p) { 477 String key = label; 478 if (KeyMatchType.REGEX.equals(matchType)) { 479 final Collection<String> matchingKeys = Utils.filter(p.keySet(), containsPattern); 480 if (!matchingKeys.isEmpty()) { 481 key = matchingKeys.iterator().next(); 482 } 483 } 484 return new Tag(key, p.get(key)); 485 } 486 487 @Override 488 public String toString() { 489 return '[' + (negateResult ? "!" : "") + label + ']'; 490 } 491 } 492 493 public static class ClassCondition extends Condition { 494 495 public final String id; 496 public final boolean not; 497 498 public ClassCondition(String id, boolean not) { 499 this.id = id; 500 this.not = not; 501 } 502 503 @Override 504 public boolean applies(Environment env) { 505 return env != null && env.getCascade(env.layer) != null && not ^ env.getCascade(env.layer).containsKey(id); 506 } 507 508 @Override 509 public String toString() { 510 return (not ? "!" : "") + '.' + id; 511 } 512 } 513 514 /** 515 * Like <a href="http://www.w3.org/TR/css3-selectors/#pseudo-classes">CSS pseudo classes</a>, MapCSS pseudo classes 516 * are written in lower case with dashes between words. 517 */ 518 static class PseudoClasses { 519 520 /** 521 * {@code closed} tests whether the way is closed or the relation is a closed multipolygon 522 * @param e MapCSS environment 523 * @return {@code true} if the way is closed or the relation is a closed multipolygon 524 */ 525 static boolean closed(Environment e) { 526 if (e.osm instanceof Way && ((Way) e.osm).isClosed()) 527 return true; 528 if (e.osm instanceof Relation && ((Relation) e.osm).isMultipolygon()) 529 return true; 530 return false; 531 } 532 533 /** 534 * {@code :modified} tests whether the object has been modified. 535 * @param e MapCSS environment 536 * @return {@code true} if the object has been modified 537 * @see OsmPrimitive#isModified() 538 */ 539 static boolean modified(Environment e) { 540 return e.osm.isModified() || e.osm.isNewOrUndeleted(); 541 } 542 543 /** 544 * {@code ;new} tests whether the object is new. 545 * @param e MapCSS environment 546 * @return {@code true} if the object is new 547 * @see OsmPrimitive#isNew() 548 */ 549 static boolean _new(Environment e) { 550 return e.osm.isNew(); 551 } 552 553 /** 554 * {@code :connection} tests whether the object is a connection node. 555 * @param e MapCSS environment 556 * @return {@code true} if the object is a connection node 557 * @see Node#isConnectionNode() 558 */ 559 static boolean connection(Environment e) { 560 return e.osm instanceof Node && e.osm.getDataSet() != null && ((Node) e.osm).isConnectionNode(); 561 } 562 563 /** 564 * {@code :tagged} tests whether the object is tagged. 565 * @param e MapCSS environment 566 * @return {@code true} if the object is tagged 567 * @see OsmPrimitive#isTagged() 568 */ 569 static boolean tagged(Environment e) { 570 return e.osm.isTagged(); 571 } 572 573 /** 574 * {@code :same-tags} tests whether the object has the same tags as its child/parent. 575 * @param e MapCSS environment 576 * @return {@code true} if the object has the same tags as its child/parent 577 * @see OsmPrimitive#hasSameInterestingTags(OsmPrimitive) 578 */ 579 static boolean sameTags(Environment e) { 580 return e.osm.hasSameInterestingTags(Utils.firstNonNull(e.child, e.parent)); 581 } 582 583 /** 584 * {@code :area-style} tests whether the object has an area style. This is useful for validators. 585 * @param e MapCSS environment 586 * @return {@code true} if the object has an area style 587 * @see ElemStyles#hasAreaElemStyle(OsmPrimitive, boolean) 588 */ 589 static boolean areaStyle(Environment e) { 590 // only for validator 591 return ElemStyles.hasAreaElemStyle(e.osm, false); 592 } 593 594 /** 595 * {@code unconnected}: tests whether the object is a unconnected node. 596 * @param e MapCSS environment 597 * @return {@code true} if the object is a unconnected node 598 */ 599 static boolean unconnected(Environment e) { 600 return e.osm instanceof Node && OsmPrimitive.getFilteredList(e.osm.getReferrers(), Way.class).isEmpty(); 601 } 602 603 /** 604 * {@code righthandtraffic} checks if there is right-hand traffic at the current location. 605 * @param e MapCSS environment 606 * @return {@code true} if there is right-hand traffic at the current location 607 * @see ExpressionFactory.Functions#is_right_hand_traffic(Environment) 608 */ 609 static boolean righthandtraffic(Environment e) { 610 return ExpressionFactory.Functions.is_right_hand_traffic(e); 611 } 612 613 /** 614 * {@code clockwise} whether the way is closed and oriented clockwise, 615 * or non-closed and the 1st, 2nd and last node are in clockwise order. 616 * @param e MapCSS environment 617 * @return {@code true} if the way clockwise 618 * @see ExpressionFactory.Functions#is_clockwise(Environment) 619 */ 620 static boolean clockwise(Environment e) { 621 return ExpressionFactory.Functions.is_clockwise(e); 622 } 623 624 /** 625 * {@code anticlockwise} whether the way is closed and oriented anticlockwise, 626 * or non-closed and the 1st, 2nd and last node are in anticlockwise order. 627 * @param e MapCSS environment 628 * @return {@code true} if the way clockwise 629 * @see ExpressionFactory.Functions#is_anticlockwise(Environment) 630 */ 631 static boolean anticlockwise(Environment e) { 632 return ExpressionFactory.Functions.is_anticlockwise(e); 633 } 634 635 /** 636 * {@code unclosed-multipolygon} tests whether the object is an unclosed multipolygon. 637 * @param e MapCSS environment 638 * @return {@code true} if the object is an unclosed multipolygon 639 */ 640 static boolean unclosed_multipolygon(Environment e) { 641 return e.osm instanceof Relation && ((Relation) e.osm).isMultipolygon() && 642 !e.osm.isIncomplete() && !((Relation) e.osm).hasIncompleteMembers() && 643 !MultipolygonCache.getInstance().get(Main.map.mapView, (Relation) e.osm).getOpenEnds().isEmpty(); 644 } 645 646 private static final Predicate<OsmPrimitive> IN_DOWNLOADED_AREA = new InDataSourceArea(false); 647 648 /** 649 * {@code in-downloaded-area} tests whether the object is within source area ("downloaded area"). 650 * @param e MapCSS environment 651 * @return {@code true} if the object is within source area ("downloaded area") 652 * @see InDataSourceArea 653 */ 654 static boolean inDownloadedArea(Environment e) { 655 return IN_DOWNLOADED_AREA.evaluate(e.osm); 656 } 657 658 static boolean completely_downloaded(Environment e) { 659 if (e.osm instanceof Relation) { 660 return !((Relation) e.osm).hasIncompleteMembers(); 661 } else { 662 return true; 663 } 664 } 665 666 static boolean closed2(Environment e) { 667 if (e.osm instanceof Way && ((Way) e.osm).isClosed()) 668 return true; 669 if (e.osm instanceof Relation && ((Relation) e.osm).isMultipolygon()) 670 return MultipolygonCache.getInstance().get(Main.map.mapView, (Relation) e.osm).getOpenEnds().isEmpty(); 671 return false; 672 } 673 674 static boolean selected(Environment e) { 675 Cascade c = e.mc.getCascade(e.layer); 676 c.setDefaultSelectedHandling(false); 677 return e.osm.isSelected(); 678 } 679 } 680 681 public static class PseudoClassCondition extends Condition { 682 683 public final Method method; 684 public final boolean not; 685 686 protected PseudoClassCondition(Method method, boolean not) { 687 this.method = method; 688 this.not = not; 689 } 690 691 public static PseudoClassCondition createPseudoClassCondition(String id, boolean not, Context context) { 692 CheckParameterUtil.ensureThat(!"sameTags".equals(id) || Context.LINK.equals(context), "sameTags only supported in LINK context"); 693 if ("open_end".equals(id)) { 694 return new OpenEndPseudoClassCondition(not); 695 } 696 final Method method = getMethod(id); 697 if (method != null) { 698 return new PseudoClassCondition(method, not); 699 } 700 throw new MapCSSException("Invalid pseudo class specified: " + id); 701 } 702 703 protected static Method getMethod(String id) { 704 id = id.replaceAll("-|_", ""); 705 for (Method method : PseudoClasses.class.getDeclaredMethods()) { 706 // for backwards compatibility, consider :sameTags == :same-tags == :same_tags (#11150) 707 final String methodName = method.getName().replaceAll("-|_", ""); 708 if (methodName.equalsIgnoreCase(id)) { 709 return method; 710 } 711 } 712 return null; 713 } 714 715 @Override 716 public boolean applies(Environment e) { 717 try { 718 return not ^ (Boolean) method.invoke(null, e); 719 } catch (IllegalAccessException | InvocationTargetException ex) { 720 throw new RuntimeException(ex); 721 } 722 } 723 724 @Override 725 public String toString() { 726 return (not ? "!" : "") + ':' + method.getName(); 727 } 728 } 729 730 public static class OpenEndPseudoClassCondition extends PseudoClassCondition { 731 public OpenEndPseudoClassCondition(boolean not) { 732 super(null, not); 733 } 734 735 @Override 736 public boolean applies(Environment e) { 737 return true; 738 } 739 } 740 741 public static class ExpressionCondition extends Condition { 742 743 private final Expression e; 744 745 public ExpressionCondition(Expression e) { 746 this.e = e; 747 } 748 749 @Override 750 public boolean applies(Environment env) { 751 Boolean b = Cascade.convertTo(e.evaluate(env), Boolean.class); 752 return b != null && b; 753 } 754 755 @Override 756 public String toString() { 757 return "[" + e + ']'; 758 } 759 } 760}