Java Array Element Get getAllMatches(String[] target, String[] pattern)

Description

Input: array of strings, and a target array Output: the array of all the appearance

License

Apache License

Declaration

public static ArrayList<Integer> getAllMatches(String[] target, String[] pattern) 

Method Source Code

//package com.java2s;
/**/*from  w  ww . j  a  v a  2s. c  o  m*/
   * 
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you 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.
   * 
   * @author Wei Zhang,  Language Technology Institute, School of Computer Science, Carnegie-Mellon University.
   * email: wei.zhang@cs.cmu.edu
   * 
   */

import java.util.ArrayList;

public class Main {
    /**
       * Input: array of strings, and a target array Output: the array of all the appearance
       */

    public static ArrayList<Integer> getAllMatches(String[] target, String[] pattern) {

        ArrayList<Integer> result = new ArrayList<Integer>();
        int start = 0;
        while (start < target.length) {
            String[] subArray = new String[target.length - start];
            for (int iter = 0; iter < subArray.length; iter++) {
                subArray[iter] = target[iter + start];
                // System.out.print(subArray[iter]+" ");
            }
            // System.out.println();
            int index = getFirst(subArray, pattern);
            if (index != -1) {
                result.add(start + index);
                start = start + index + pattern.length;
            } else
                return result;
        }
        return result;
    }

    /**
       * Input: array of strings, and a target array Output: the first appearance position
       */
    public static int getFirst(String[] target, String[] pattern) {

        for (int i = 0; i < target.length; i++)
            target[i] = target[i].trim().toLowerCase();
        for (int i = 0; i < pattern.length; i++)
            pattern[i] = pattern[i].trim().toLowerCase();

        int tlen = target.length;
        int plen = pattern.length;

        int itarget = 0, ipattern = 0;

        while (itarget != tlen) {

            if ((itarget + plen) >= tlen)
                return -1;
            while (ipattern < plen) {
                if (pattern[ipattern].equals(target[itarget + ipattern])) {
                    if (ipattern == (plen - 1))
                        return itarget;
                    else {
                        ipattern++;
                    }
                } else
                    break;
            }
            itarget++;
            ipattern = 0;
        }
        return -1;
    }
}

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