DATAREST-1198 - Add Converter to convert String to javax.naming.ldap.LdapName.

We now provide and configure a converter for String to LdapName conversion so Spring Data LDAP can be used with Spring Data REST without further configuration.

Original pull request: #290.

spring-data-rest-core/src/main/java/org/springframework/data/rest/core/StringToLdapNameConverter.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2018 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.rest.core;
+
+import javax.naming.InvalidNameException;
+import javax.naming.Name;
+import javax.naming.ldap.LdapName;
+
+import org.springframework.core.convert.converter.Converter;
+
+/**
+ * {@link Converter} to convert a {@link String} to a {@link LdapName}.
+ *
+ * @author Mark Paluch
+ * @since 3.1
+ */
+public enum StringToLdapNameConverter implements Converter<String, Name> {
+
+	INSTANCE;
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.core.convert.converter.Converter#convert(java.lang.Object)
+	 */
+	@Override
+	public LdapName convert(String source) {
+
+		try {
+			return new LdapName(source);
+		} catch (InvalidNameException e) {
+			throw new IllegalArgumentException(String.format("Cannot create LdapName for '%s'!", source), e);
+		}
+	}
+}

spring-data-rest-core/src/test/java/org/springframework/data/rest/core/StringToLdapNameConverterUnitTests.java

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+/*
+ * Copyright 2018 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.rest.core;
+
+import static org.assertj.core.api.Assertions.*;
+
+import javax.naming.InvalidNameException;
+import javax.naming.Name;
+import javax.naming.ldap.LdapName;
+
+import org.junit.Test;
+import org.springframework.core.convert.support.DefaultConversionService;
+
+/**
+ * Unit tests for {@link StringToLdapNameConverter}.
+ *
+ * @author Mark Paluch
+ */
+public class StringToLdapNameConverterUnitTests {
+
+	@Test // DATAREST-1198
+	public void shouldCreateLdapName() throws InvalidNameException {
+
+		LdapName converted = StringToLdapNameConverter.INSTANCE.convert("dc=foo");
+
+		assertThat(converted).isEqualTo(new LdapName("dc=foo"));
+	}
+
+	@Test // DATAREST-1198
+	public void failedConversionShouldThrowIAE() {
+
+		assertThatThrownBy(() -> StringToLdapNameConverter.INSTANCE.convert("foo"))
+				.isInstanceOf(IllegalArgumentException.class);
+	}
+
+	@Test // DATAREST-1198
+	public void shouldConvertStringInNameViaConversionService() {
+
+		DefaultConversionService conversionService = new DefaultConversionService();
+		conversionService.addConverter(StringToLdapNameConverter.INSTANCE);
+
+		Name converted = conversionService.convert("dc=foo", Name.class);
+
+		assertThat(converted).isInstanceOf(LdapName.class);
+	}
+}