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OGM-692 [Neo4j] Fix queries on embedded properties
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...src/main/java/org/hibernate/ogm/datastore/neo4j/query/parsing/impl/EmbeddedAliasTree.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /* | ||
| * Hibernate OGM, Domain model persistence for NoSQL datastores | ||
| * | ||
| * License: GNU Lesser General Public License (LGPL), version 2.1 or later | ||
| * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>. | ||
| */ | ||
| package org.hibernate.ogm.datastore.neo4j.query.parsing.impl; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
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| /** | ||
| * Tree structure that can be used to store alias of embedded components in Neo4j. | ||
| * <p> | ||
| * For example, a path to two properties like: | ||
| * <ol> | ||
| * <li>n.first.anotherEmbedded</li> | ||
| * <li>n.second.anotherEmbedded</li> | ||
| * </ol> | ||
| * Might be represented with the following structure: | ||
| * <pre> | ||
| * n (alias = n)|- first (alias = n_0) -- anotherEmbedded (alias = n_0_0) | ||
| * | | ||
| * -- second (alias = n_1) -- anotherEmbedded (alias = n_0_1) | ||
| * </pre> | ||
| * | ||
| * @author Davide D'Alto | ||
| */ | ||
| public class EmbeddedAliasTree { | ||
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| private final String name; | ||
| private final String alias; | ||
| private final List<EmbeddedAliasTree> children; | ||
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| /** | ||
| * Creates a tree node. | ||
| * | ||
| * @param alias the alias used for the embedded | ||
| * @param name the name of the property representing the emebedded | ||
| */ | ||
| public EmbeddedAliasTree(String alias, String name) { | ||
| this.name = name; | ||
| this.alias = alias; | ||
| this.children = new ArrayList<EmbeddedAliasTree>(); | ||
| } | ||
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| public EmbeddedAliasTree findChild(String name) { | ||
| for ( EmbeddedAliasTree child : children ) { | ||
| if ( child.getName().equals( name ) ) { | ||
| return child; | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
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| public String getName() { | ||
| return name; | ||
| } | ||
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| public void addChild(EmbeddedAliasTree embeddedNode) { | ||
| children.add( embeddedNode ); | ||
| } | ||
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| public String getAlias() { | ||
| return alias; | ||
| } | ||
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| public List<EmbeddedAliasTree> getChildren() { | ||
| return Collections.unmodifiableList( children ); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| StringBuilder builder = new StringBuilder(); | ||
| builder.append( "[name=" ); | ||
| builder.append( name ); | ||
| builder.append( ", alias=" ); | ||
| builder.append( alias ); | ||
| builder.append( "]" ); | ||
| return builder.toString(); | ||
| } | ||
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| } |
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