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DATACMNS-875 - Add support for exists projection in repository query derivation.

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We now support exists projections in derived queries by parsing the exists keyword and expose it via PartTree.isExistsProjection().

Original pull request: #171.
This commit is contained in:
Mark Paluch
2016-06-28 14:25:12 +02:00
committed by Oliver Gierke
parent 2b14d1ea54
commit 8bc022ebd7
2 changed files with 50 additions and 4 deletions
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29
src/main/java/org/springframework/data/repository/query/parser/PartTree.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2008-2015 the original author or authors.
* Copyright 2008-2016 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -36,6 +36,7 @@ import org.springframework.util.StringUtils;
* @author Oliver Gierke
* @author Thomas Darimont
* @author Christoph Strobl
* @author Mark Paluch
*/
public class PartTree implements Iterable<OrPart> {
@@ -52,9 +53,10 @@ public class PartTree implements Iterable<OrPart> {
private static final String KEYWORD_TEMPLATE = "(%s)(?=(\\p{Lu}|\\P{InBASIC_LATIN}))";
private static final String QUERY_PATTERN = "find|read|get|query|stream";
private static final String COUNT_PATTERN = "count";
private static final String EXISTS_PATTERN = "exists";
private static final String DELETE_PATTERN = "delete|remove";
private static final Pattern PREFIX_TEMPLATE = Pattern.compile( //
"^(" + QUERY_PATTERN + "|" + COUNT_PATTERN + "|" + DELETE_PATTERN + ")((\\p{Lu}.*?))??By");
"^(" + QUERY_PATTERN + "|" + COUNT_PATTERN + "|" + EXISTS_PATTERN + "|" + DELETE_PATTERN + ")((\\p{Lu}.*?))??By");
/**
* The subject, for example "findDistinctUserByNameOrderByAge" would have the subject "DistinctUser".
@@ -125,6 +127,16 @@ public class PartTree implements Iterable<OrPart> {
return subject.isCountProjection();
}
/**
* Returns whether an exists projection shall be applied.
*
* @return
* @since 1.13
*/
public Boolean isExistsProjection() {
return subject.isExistsProjection();
}
/**
* return true if the created {@link PartTree} is meant to be used for delete operation.
*
@@ -262,6 +274,7 @@ public class PartTree implements Iterable<OrPart> {
private static final String DISTINCT = "Distinct";
private static final Pattern COUNT_BY_TEMPLATE = Pattern.compile("^count(\\p{Lu}.*?)??By");
private static final Pattern EXISTS_BY_TEMPLATE = Pattern.compile("^(" + EXISTS_PATTERN + ")(\\p{Lu}.*?)??By");
private static final Pattern DELETE_BY_TEMPLATE = Pattern.compile("^(" + DELETE_PATTERN + ")(\\p{Lu}.*?)??By");
private static final String LIMITING_QUERY_PATTERN = "(First|Top)(\\d*)?";
private static final Pattern LIMITED_QUERY_TEMPLATE = Pattern.compile("^(" + QUERY_PATTERN + ")(" + DISTINCT + ")?"
@@ -269,6 +282,7 @@ public class PartTree implements Iterable<OrPart> {
private final boolean distinct;
private final boolean count;
private final boolean exists;
private final boolean delete;
private final Integer maxResults;
@@ -276,6 +290,7 @@ public class PartTree implements Iterable<OrPart> {
this.distinct = subject == null ? false : subject.contains(DISTINCT);
this.count = matches(subject, COUNT_BY_TEMPLATE);
this.exists = matches(subject, EXISTS_BY_TEMPLATE);
this.delete = matches(subject, DELETE_BY_TEMPLATE);
this.maxResults = returnMaxResultsIfFirstKSubjectOrNull(subject);
}
@@ -314,6 +329,16 @@ public class PartTree implements Iterable<OrPart> {
return count;
}
/**
* Returns {@literal true} if {@link Subject} matches {@link #EXISTS_BY_TEMPLATE}.
*
* @return
* @since 1.13
*/
public boolean isExistsProjection() {
return exists;
}
public boolean isDistinct() {
return distinct;
}