Add new function for arrays: PgArrayILikeFunction

Author: pabloalba

README.md

@@ -22,6 +22,7 @@ Currently the plugin supports array, hstore and json fields as well as some quer
         * [Is Empty or Contains](#is-empty-or-contains)
         * [Equals](#equals)
         * [Not Equals](#not-equals)
+        * [Ilike](#ilike)
   * [Hstore](#hstore)
     * [Grails 2.2.5 and 2.3.1+](#grails-225-and-231)
     * [Old Grails versions](#old-grails-versions)
@@ -291,6 +292,20 @@ def result = Like.withCriteria {
 }
 ```
 
+#### ILike
+
+With this criteria you can get all the rows that are ilike to a value. To use it just use the new criteria `pgArrayIlike`.
+
+It only can be used on arrays of string.
+
+It uses the ilike syntaxis, so you can do for example:
+
+```groovy
+def result = Like.withCriteria {
+    pgArrayIlike 'favoriteMovies', "%tarwar%"
+}
+```
+
 
 ### Hstore
 

src/groovy/net/kaleidos/hibernate/postgresql/criteria/ArrayCriterias.groovy

@@ -2,6 +2,7 @@ package net.kaleidos.hibernate.postgresql.criteria
 
 import grails.orm.HibernateCriteriaBuilder
 import net.kaleidos.hibernate.criterion.array.PgArrayExpression
+import net.kaleidos.hibernate.criterion.array.PgArrayILikeFunction
 import net.kaleidos.hibernate.criterion.array.PgEmptinessExpression
 
 class ArrayCriterias {
@@ -15,6 +16,7 @@ class ArrayCriterias {
         addIsEmptyOrContainsOperator()
         addEqualsOperator()
         addNotEqualsOperator()
+        addILikeOperator()
     }
 
     private void addContainsOperator() {
@@ -160,6 +162,26 @@ class ArrayCriterias {
         }
     }
 
+    private void addILikeOperator() {
+        /**
+         * Creates a "ilike in native array" Criterion based on the specified property name and value
+         * @param propertyName The property name
+         * @param propertyValue The property value
+         * @return A Criterion instance
+         */
+        HibernateCriteriaBuilder.metaClass.pgArrayIlike = { String propertyName, String propertyValue ->
+            if (!validateSimpleExpression()) {
+                throwRuntimeException(new IllegalArgumentException("Call to [pgArrayIlike] with propertyName [" +
+                        propertyName + "] and value [" + propertyValue + "] not allowed here."))
+            }
+
+            propertyName = calculatePropertyName(propertyName)
+            propertyValue = calculatePropertyValue(propertyValue)
+
+            return addToCriteria(new PgArrayILikeFunction(propertyName, propertyValue))
+        }
+    }
+
     private void addNotEqualsOperator() {
         /**
          * Creates a "not equals in native array" Criterion based on the specified property name and value

src/java/net/kaleidos/hibernate/criterion/array/PgArrayILikeFunction.java

@@ -0,0 +1,45 @@
+package net.kaleidos.hibernate.criterion.array;
+
+import net.kaleidos.hibernate.usertype.ArrayType;
+import net.kaleidos.hibernate.utils.PgArrayUtils;
+import org.hibernate.Criteria;
+import org.hibernate.HibernateException;
+import org.hibernate.annotations.common.util.StringHelper;
+import org.hibernate.criterion.CriteriaQuery;
+import org.hibernate.criterion.Criterion;
+import org.hibernate.engine.spi.TypedValue;
+import org.hibernate.type.CustomType;
+import org.hibernate.type.Type;
+import org.hibernate.type.StringType;
+
+/**
+ * Constrains a property in an array
+ */
+public class PgArrayILikeFunction implements Criterion {
+
+    private static final long serialVersionUID = 7475136611436979257L;
+
+    private final String propertyName;
+    private final String value;
+
+    protected PgArrayILikeFunction(String propertyName, String value) {
+        this.propertyName = propertyName;
+        this.value = value;
+    }
+
+    @Override
+    public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery) throws HibernateException {
+        String[] columns = StringHelper.suffix(criteriaQuery.findColumns(propertyName, criteria), "");
+        for (int i=0; i<columns.length; i++) {
+            columns[i] = "text(" + columns[i]+ ") ilike ?";
+        }
+        return StringHelper.join( " and ", columns);
+    }
+
+    @Override
+    public TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery) throws HibernateException {
+        return new TypedValue[]{
+            new TypedValue(new StringType(), value)
+        };
+    }
+}

test/integration/net/kaleidos/hibernate/array/PgILikeCriteriaTestServiceIntegrationSpec.groovy

@@ -0,0 +1,35 @@
+package net.kaleidos.hibernate.array
+
+import spock.lang.Specification
+import spock.lang.Unroll
+import test.criteria.array.Like
+
+class PgILikeCriteriaTestServiceIntegrationSpec extends Specification {
+
+    def pgArrayTestSearchService
+
+    @Unroll
+    void "check ilike for #movie in an array of strings"() {
+        setup:
+            new Like(favoriteMovies: ["The Matrix", "The Lord of the Rings"]).save()
+            new Like(favoriteMovies: ["Spiderman", "Blade Runner", "Starwars"]).save()
+            new Like(favoriteMovies: ["Starwars"]).save()
+            new Like(favoriteMovies: ["Romeo & Juliet", "Blade Runner", "The Lord of the Rings"]).save()
+            new Like(favoriteMovies: []).save()
+
+        when:
+            def result = pgArrayTestSearchService.search('favoriteMovies', 'pgArrayIlike', movie)
+
+        then:
+            result.size() == resultSize
+
+        where:
+            movie                                               | resultSize
+            "%tarwar%"                                          | 2
+            "%ider%"                                            | 1
+            "%Suspects%"                                        | 0
+            ""                                                  | 0
+            "%"                                                 | 5
+    }
+
+}