/**
 * ============LICENSE_START====================================================
 * org.onap.aaf
 * ===========================================================================
 * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
 * ===========================================================================
 * 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.
 * ============LICENSE_END====================================================
 *
 */

package org.onap.aaf.misc.env.util;

/**
 * Split by Char, optional Trim
 * 
 * Note: I read the String split and Pattern split code, and we can do this more efficiently for a single Character
 * 
 * Jonathan 8/20/2015
 */

public class Split {
      private static final String[] BLANK = new String[0];
      
      public static String[] split(char c, String value) {
          if(value==null) {
              return BLANK;
          }

          // Count items to preallocate Array (memory alloc is more expensive than counting twice)
          int count,idx;
          for(count=1,idx=value.indexOf(c);idx>=0;idx=value.indexOf(c,++idx),++count);
          String[] rv = new String[count];
          if(count==1) {
              rv[0]=value;
          } else {
              int last=0;
              count=-1;
              for(idx=value.indexOf(c);idx>=0;idx=value.indexOf(c,idx)) {
                  rv[++count]=value.substring(last,idx);
                  last = ++idx;
              }
              rv[++count]=value.substring(last);
          }
          return rv;
      }

      public static String[] splitTrim(char c, String value) {
          if(value==null) {
              return BLANK;
          }
          // Count items to preallocate Array (memory alloc is more expensive than counting twice)
          int count,idx;
          for(count=1,idx=value.indexOf(c);idx>=0;idx=value.indexOf(c,++idx),++count);
          String[] rv = new String[count];
          if(count==1) {
              rv[0]=value.trim();
          } else {
              int last=0;
              count=-1;
              for(idx=value.indexOf(c);idx>=0;idx=value.indexOf(c,idx)) {
                  rv[++count]=value.substring(last,idx).trim();
                  last = ++idx;
              }
              rv[++count]=value.substring(last).trim();
          }
          return rv;
      }

      public static String[] splitTrim(char c, String value, int size) {
          if(value==null) {
              return BLANK;
          }

          int idx;
          String[] rv = new String[size];
          if(size==1) {
              rv[0]=value.trim();
          } else {
              int last=0;
              int count=-1;
              size-=2;
              for(idx=value.indexOf(c);idx>=0 && count<size;idx=value.indexOf(c,idx)) {
                  rv[++count]=value.substring(last,idx).trim();
                  last = ++idx;
              }
              rv[++count]=value.substring(last).trim();
          }
          return rv;
      }

}