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36 changes: 36 additions & 0 deletions
36
agrest-engine/src/main/java/io/agrest/exp/parser/ParsingUtils.java
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Original file line number | Diff line number | Diff line change |
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package io.agrest.exp.parser; | ||
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import java.util.HashMap; | ||
import java.util.Map; | ||
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public final class ParsingUtils { | ||
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private ParsingUtils() { | ||
} | ||
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static void processPathAliases(ExpPath pathExp) throws ParseException { | ||
String path = pathExp.getPath(); | ||
if (!path.contains("#")) { | ||
return; | ||
} | ||
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String[] pathSegments = path.split("\\."); | ||
Map<String, String> aliasMap = new HashMap<>(); | ||
for (int i = 0; i < pathSegments.length; i++) { | ||
if (pathSegments[i].contains("#")) { | ||
String[] splitSegment = pathSegments[i].split("#"); | ||
if (splitSegment[1].endsWith("+")) { | ||
splitSegment[0] += '+'; | ||
splitSegment[1] = splitSegment[1].substring(0, splitSegment[1].length() - 1); | ||
} | ||
String previousAlias = aliasMap.putIfAbsent(splitSegment[1], splitSegment[0]); | ||
if (previousAlias != null && !previousAlias.equals(splitSegment[0])) { | ||
throw new ParseException("Can't add the same alias to different path segments."); | ||
} | ||
pathSegments[i] = splitSegment[1]; | ||
} | ||
} | ||
pathExp.setPath(String.join(".", pathSegments)); | ||
pathExp.setPathAliases(aliasMap); | ||
} | ||
} |
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