final String value = params.get(fieldName);
        if (StringUtil.isNotBlank(value)) {
            return OptionalThing.of(new Config(value));
        }
        return OptionalThing.empty();
    }

    public static class Config {

        private final String[] values;

        public Config(final String value) {

 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.io;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import java.io.FilterOutputStream;
import java.io.IOException;

  char getLeafNodeCode() {
    return leafNodeCode;
  }

  char getInnerNodeCode() {
    return innerNodeCode;
  }

  /** Returns a PublicSuffixType of the right type according to the given code */
  static PublicSuffixType fromCode(char code) {
    for (PublicSuffixType value : values()) {
      if (value.getInnerNodeCode() == code || value.getLeafNodeCode() == code) {
        return value;
      }
    }

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 */
@Deprecated
public class ModelValidationResult {

    /** */
    private static final String LS = System.lineSeparator();

    /** */
    private List<String> messages;

    public ModelValidationResult() {
        messages = new ArrayList<>();
    }

    public int getMessageCount() {

    }

    public String getGoal() {
        return goal;
    }

    public PluginDescriptor getPluginDescriptor() {
        return pluginDescriptor;
    }

    private static String toMessage(String goal, PluginDescriptor pluginDescriptor) {
        StringBuilder buffer = new StringBuilder(256);

        buffer.append("Could not find goal '").append(goal).append('\'');

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertThrows;

public class GraphTest {

    @Test
    void testCycle() throws Graph.CycleDetectedException {
        Graph graph = new Graph();
        graph.addEdge("a1", "a2");

    return response.body().string();
  }
}
```


Post to a Server
----------------

This program posts data to a service. [Full source][post_example].

```java
public static final MediaType JSON = MediaType.get("application/json");

OkHttpClient client = new OkHttpClient();

String post(String url, String json) throws IOException {
  RequestBody body = RequestBody.create(json, JSON);

### [Addresses](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-address/)

Addresses specify a webserver (like `github.com`) and all of the **static** configuration necessary to connect to that server: the port number, HTTPS settings, and preferred network protocols (like HTTP/2).

        } else {
            if (match.endsWith(".adoc")) {
                return match;
            }
            return match + ".adoc";
        }
    }

    private static class Error {
        private final int lineNumber;
        private final String line;
        private final String message;

        private Error(int lineNumber, String line, String message) {

import org.codelibs.fess.crawler.log.LogType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author shinsuke
 *
 */
public class LogHelperImpl implements LogHelper {

    private static final Logger logger = LoggerFactory.getLogger(LogHelperImpl.class);

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.helper.LogHelper#log(org.codelibs.fess.crawler.log.LogType,