1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.conflict.tags;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.text.MessageFormat;
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7 | import java.util.ArrayList;
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8 | import java.util.Collection;
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9 | import java.util.Collections;
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10 | import java.util.List;
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11 |
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12 | import org.openstreetmap.josm.command.ChangePropertyCommand;
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13 | import org.openstreetmap.josm.command.Command;
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14 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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15 | import org.openstreetmap.josm.data.osm.Tag;
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16 | import org.openstreetmap.josm.data.osm.TagCollection;
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17 | import org.openstreetmap.josm.tools.CheckParameterUtil;
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18 | /**
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19 | * Represents a decision for a conflict due to multiple possible value for a tag.
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20 | *
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21 | *
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22 | */
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23 | public class MultiValueResolutionDecision {
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24 |
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25 | /** the type of decision */
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26 | private MultiValueDecisionType type;
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27 | /** the collection of tags for which a decision is needed */
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28 | private TagCollection tags;
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29 | /** the selected value if {@link #type} is {@link MultiValueDecisionType#KEEP_ONE} */
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30 | private String value;
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31 |
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32 | /**
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33 | * constuctor
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34 | */
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35 | public MultiValueResolutionDecision() {
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36 | type = MultiValueDecisionType.UNDECIDED;
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37 | tags = new TagCollection();
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38 | autoDecide();
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39 | }
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40 |
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41 | /**
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42 | * Creates a new decision for the tag collection <code>tags</code>.
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43 | * All tags must have the same key.
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44 | *
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45 | * @param tags the tags. Must not be null.
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46 | * @exception IllegalArgumentException thrown if tags is null
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47 | * @exception IllegalArgumentException thrown if there are more than one keys
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48 | * @exception IllegalArgumentException thrown if tags is empty
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49 | */
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50 | public MultiValueResolutionDecision(TagCollection tags) throws IllegalArgumentException {
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51 | CheckParameterUtil.ensureParameterNotNull(tags, "tags");
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52 | if (tags.isEmpty())
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53 | throw new IllegalArgumentException(MessageFormat.format("Parameter ''{0}'' must not be empty.", "tags"));
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54 | if (tags.getKeys().size() != 1)
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55 | throw new IllegalArgumentException(MessageFormat.format("Parameter ''{0}'' with tags for exactly one key expected. Got {1}.", "tags", tags.getKeys().size()));
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56 | this.tags = tags;
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57 | autoDecide();
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58 | }
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59 |
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60 | /**
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61 | * Tries to find the best decision based on the current values.
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62 | */
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63 | protected void autoDecide() {
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64 | this.type = MultiValueDecisionType.UNDECIDED;
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65 | // exactly one empty value ? -> delete the tag
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66 | if (tags.size() == 1 && tags.getValues().contains("")) {
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67 | this.type = MultiValueDecisionType.KEEP_NONE;
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68 |
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69 | // exactly one non empty value? -> keep this value
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70 | } else if (tags.size() == 1) {
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71 | this.type = MultiValueDecisionType.KEEP_ONE;
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72 | this.value = tags.getValues().iterator().next();
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73 | }
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74 | }
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75 |
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76 | /**
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77 | * Apply the decision to keep no value
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78 | */
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79 | public void keepNone() {
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80 | this.type = MultiValueDecisionType.KEEP_NONE;
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81 | }
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82 |
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83 | /**
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84 | * Apply the decision to keep all values
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85 | */
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86 | public void keepAll() {
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87 | this.type = MultiValueDecisionType.KEEP_ALL;
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88 | }
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89 |
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90 | /**
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91 | * Apply the decision to keep exactly one value
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92 | *
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93 | * @param value the value to keep
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94 | * @throws IllegalArgumentException thrown if value is null
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95 | * @throws IllegalStateException thrown if value is not in the list of known values for this tag
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96 | */
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97 | public void keepOne(String value) throws IllegalArgumentException, IllegalStateException {
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98 | CheckParameterUtil.ensureParameterNotNull(value, "value");
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99 | if (!tags.getValues().contains(value))
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100 | throw new IllegalStateException(tr("Tag collection does not include the selected value ''{0}''.", value));
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101 | this.value = value;
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102 | this.type = MultiValueDecisionType.KEEP_ONE;
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103 | }
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104 |
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105 | /**
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106 | * sets a new value for this
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107 | *
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108 | * @param value the new vlaue
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109 | */
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110 | public void setNew(String value) {
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111 | if (value == null) {
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112 | value = "";
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113 | }
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114 | this.value = value;
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115 | this.type = MultiValueDecisionType.KEEP_ONE;
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116 |
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117 | }
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118 |
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119 | /**
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120 | * marks this as undecided
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121 | *
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122 | */
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123 | public void undecide() {
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124 | this.type = MultiValueDecisionType.UNDECIDED;
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125 | }
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126 |
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127 | /**
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128 | * Replies the chosen value
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129 | *
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130 | * @return the chosen value
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131 | * @throws IllegalStateException thrown if this resolution is not yet decided
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132 | */
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133 | public String getChosenValue() throws IllegalStateException {
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134 | switch(type) {
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135 | case UNDECIDED: throw new IllegalStateException(tr("Not decided yet."));
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136 | case KEEP_ONE: return value;
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137 | case KEEP_NONE: return null;
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138 | case KEEP_ALL: return tags.getJoinedValues(getKey());
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139 | }
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140 | // should not happen
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141 | return null;
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142 | }
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143 |
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144 | /**
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145 | * Replies the list of possible, non empty values
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146 | *
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147 | * @return the list of possible, non empty values
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148 | */
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149 | public List<String> getValues() {
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150 | List<String> ret = new ArrayList<String>(tags.getValues());
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151 | ret.remove("");
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152 | ret.remove(null);
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153 | Collections.sort(ret);
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154 | return ret;
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155 | }
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156 |
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157 | /**
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158 | * Replies the key of the tag to be resolved by this resolution
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159 | *
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160 | * @return the key of the tag to be resolved by this resolution
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161 | */
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162 | public String getKey() {
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163 | return tags.getKeys().iterator().next();
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164 | }
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165 |
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166 | /**
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167 | * Replies true if the empty value is a possible value in this resolution
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168 | *
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169 | * @return true if the empty value is a possible value in this resolution
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170 | */
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171 | public boolean canKeepNone() {
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172 | return tags.getValues().contains("");
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173 | }
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174 |
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175 | /**
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176 | * Replies true, if this resolution has more than 1 possible non-empty values
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177 | *
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178 | * @return true, if this resolution has more than 1 possible non-empty values
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179 | */
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180 | public boolean canKeepAll() {
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181 | return getValues().size() > 1;
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182 | }
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183 |
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184 | /**
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185 | * Replies true if this resolution is decided
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186 | *
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187 | * @return true if this resolution is decided
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188 | */
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189 | public boolean isDecided() {
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190 | return !type.equals(MultiValueDecisionType.UNDECIDED);
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191 | }
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192 |
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193 | /**
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194 | * Replies the type of the resolution
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195 | *
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196 | * @return the type of the resolution
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197 | */
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198 | public MultiValueDecisionType getDecisionType() {
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199 | return type;
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200 | }
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201 |
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202 | /**
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203 | * Applies the resolution to an {@link OsmPrimitive}
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204 | *
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205 | * @param primitive the primitive
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206 | * @throws IllegalStateException thrown if this resolution is not resolved yet
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207 | *
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208 | */
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209 | public void applyTo(OsmPrimitive primitive) throws IllegalStateException{
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210 | if (primitive == null) return;
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211 | if (!isDecided())
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212 | throw new IllegalStateException(tr("Not decided yet."));
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213 | String key = tags.getKeys().iterator().next();
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214 | String value = getChosenValue();
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215 | if (type.equals(MultiValueDecisionType.KEEP_NONE)) {
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216 | primitive.remove(key);
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217 | } else {
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218 | primitive.put(key, value);
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219 | }
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220 | }
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221 |
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222 | /**
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223 | * Applies this resolution to a collection of primitives
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224 | *
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225 | * @param primitives the collection of primitives
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226 | * @throws IllegalStateException thrown if this resolution is not resolved yet
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227 | */
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228 | public void applyTo(Collection<? extends OsmPrimitive> primitives) throws IllegalStateException {
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229 | if (primitives == null) return;
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230 | for (OsmPrimitive primitive: primitives) {
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231 | if (primitive == null) {
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232 | continue;
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233 | }
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234 | applyTo(primitive);
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235 | }
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236 | }
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237 |
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238 | /**
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239 | * Builds a change command for applying this resolution to a primitive
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240 | *
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241 | * @param primitive the primitive
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242 | * @return the change command
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243 | * @throws IllegalArgumentException thrown if primitive is null
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244 | * @throws IllegalStateException thrown if this resolution is not resolved yet
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245 | */
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246 | public Command buildChangeCommand(OsmPrimitive primitive) throws IllegalArgumentException, IllegalStateException {
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247 | CheckParameterUtil.ensureParameterNotNull(primitive, "primitive");
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248 | if (!isDecided())
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249 | throw new IllegalStateException(tr("Not decided yet."));
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250 | String key = tags.getKeys().iterator().next();
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251 | String value = getChosenValue();
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252 | ChangePropertyCommand cmd = new ChangePropertyCommand(primitive, key,value);
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253 | return cmd;
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254 | }
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255 |
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256 | /**
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257 | * Builds a change command for applying this resolution to a collection of primitives
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258 | *
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259 | * @param primitives the collection of primitives
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260 | * @return the change command
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261 | * @throws IllegalArgumentException thrown if primitives is null
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262 | * @throws IllegalStateException thrown if this resolution is not resolved yet
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263 | */
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264 | public Command buildChangeCommand(Collection<? extends OsmPrimitive> primitives) {
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265 | CheckParameterUtil.ensureParameterNotNull(primitives, "primitives");
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266 | if (!isDecided())
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267 | throw new IllegalStateException(tr("Not decided yet."));
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268 | String key = tags.getKeys().iterator().next();
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269 | String value = getChosenValue();
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270 | ChangePropertyCommand cmd = new ChangePropertyCommand(primitives, key,value);
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271 | return cmd;
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272 | }
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273 |
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274 | /**
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275 | * Replies a tag representing the current resolution. Null, if this resolution is not resolved
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276 | * yet.
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277 | *
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278 | * @return a tag representing the current resolution. Null, if this resolution is not resolved
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279 | * yet
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280 | */
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281 | public Tag getResolution() {
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282 | switch(type) {
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283 | case KEEP_ALL: return new Tag(getKey(), tags.getJoinedValues(getKey()));
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284 | case KEEP_ONE: return new Tag(getKey(),value);
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285 | case KEEP_NONE: return new Tag(getKey(), "");
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286 | case UNDECIDED: return null;
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287 | }
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288 | return null;
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289 | }
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290 | }
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