StringHelper.java

/**
 * Copyright 2014 Sunny Gleason and 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 io.kazuki.v0.internal.helper;

import java.util.Collection;

import com.google.common.base.CaseFormat;
import com.google.common.base.Preconditions;

public class StringHelper {
  public static String toCamelCase(String value) {
    Preconditions.checkNotNull(value, "value");

    String canonical = value.replace('.', '-').toLowerCase();

    return CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, canonical);
  }

  public static String join(String delim, String... values) {
    if (values == null || values.length == 0) {
      return "";
    }

    StringBuilder s = new StringBuilder();

    for (String v : values) {
      s.append(delim);
      s.append(v);
    }

    return s.toString().substring(delim.length());
  }

  public static String join(String delim, Collection<String> values) {
    if (values == null || values.size() == 0) {
      return "";
    }

    StringBuilder s = new StringBuilder();

    for (String v : values) {
      s.append(delim);
      s.append(v);
    }

    return s.toString().substring(delim.length());
  }
}