1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.osm;
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3 |
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4 | import java.util.Collection;
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5 | import java.util.HashSet;
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6 | import java.util.Objects;
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7 | import java.util.Set;
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8 |
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9 | /**
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10 | * This is an extension of {@link RelationMember} that stores the parent relation and the index in it in addition to the role/child.
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11 | */
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12 | public class RelationToChildReference {
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13 |
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14 | /**
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15 | * Replies a set of all {@link RelationToChildReference}s for a given child primitive.
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16 | *
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17 | * @param child the child primitive
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18 | * @return a set of all {@link RelationToChildReference}s for a given child primitive
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19 | */
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20 | public static Set<RelationToChildReference> getRelationToChildReferences(OsmPrimitive child) {
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21 | Set<Relation> parents = OsmPrimitive.getFilteredSet(child.getReferrers(), Relation.class);
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22 | Set<RelationToChildReference> references = new HashSet<>();
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23 | for (Relation parent: parents) {
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24 | for (int i = 0; i < parent.getMembersCount(); i++) {
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25 | if (parent.getMember(i).refersTo(child)) {
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26 | references.add(new RelationToChildReference(parent, i, parent.getMember(i)));
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27 | }
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28 | }
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29 | }
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30 | return references;
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31 | }
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32 |
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33 | /**
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34 | * Replies a set of all {@link RelationToChildReference}s for a collection of child primitives
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35 | *
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36 | * @param children the collection of child primitives
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37 | * @return a set of all {@link RelationToChildReference}s to the children in the collection of child
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38 | * primitives
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39 | */
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40 | public static Set<RelationToChildReference> getRelationToChildReferences(Collection<? extends OsmPrimitive> children) {
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41 | Set<RelationToChildReference> references = new HashSet<>();
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42 | for (OsmPrimitive child: children) {
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43 | references.addAll(getRelationToChildReferences(child));
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44 | }
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45 | return references;
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46 | }
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47 |
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48 | private final Relation parent;
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49 | private final int position;
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50 | private final String role;
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51 | private final OsmPrimitive child;
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52 |
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53 | /**
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54 | * Create a new {@link RelationToChildReference}
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55 | * @param parent The parent relation
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56 | * @param position The position of the child in the parent
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57 | * @param role The role of the child
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58 | * @param child The actual child (member of parent)
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59 | */
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60 | public RelationToChildReference(Relation parent, int position, String role, OsmPrimitive child) {
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61 | this.parent = parent;
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62 | this.position = position;
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63 | this.role = role;
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64 | this.child = child;
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65 | }
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66 |
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67 | /**
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68 | * Create a new {@link RelationToChildReference}
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69 | * @param parent The parent relation
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70 | * @param position The position of the child in the parent
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71 | * @param member The role and relation for the child
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72 | */
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73 | public RelationToChildReference(Relation parent, int position, RelationMember member) {
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74 | this(parent, position, member.getRole(), member.getMember());
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75 | }
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76 |
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77 | /**
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78 | * Get the parent relation
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79 | * @return The parent
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80 | */
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81 | public Relation getParent() {
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82 | return parent;
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83 | }
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84 |
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85 | /**
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86 | * Get the position of the child in the parent
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87 | * @return The position of the child
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88 | */
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89 | public int getPosition() {
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90 | return position;
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91 | }
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92 |
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93 | /**
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94 | * Get the role of the child
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95 | * @return The role
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96 | */
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97 | public String getRole() {
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98 | return role;
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99 | }
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100 |
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101 | /**
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102 | * Get the actual child
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103 | * @return The child
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104 | */
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105 | public OsmPrimitive getChild() {
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106 | return child;
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107 | }
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108 |
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109 | @Override
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110 | public boolean equals(Object obj) {
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111 | if (this == obj) return true;
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112 | if (obj == null || getClass() != obj.getClass()) return false;
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113 | RelationToChildReference that = (RelationToChildReference) obj;
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114 | return position == that.position &&
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115 | Objects.equals(parent, that.parent) &&
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116 | Objects.equals(role, that.role) &&
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117 | Objects.equals(child, that.child);
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118 | }
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119 |
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120 | @Override
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121 | public int hashCode() {
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122 | return Objects.hash(parent, position, role, child);
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123 | }
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124 | }
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