Java Collection Add addPreviousTags(int index, String[] prevTags, int prevTagsToAdd, Collection targetCol)

Description

add Previous Tags

License

Apache License

Declaration

public static void addPreviousTags(int index, String[] prevTags, int prevTagsToAdd,
            Collection<String> targetCol) 

Method Source Code

//package com.java2s;
/*/*from   www. j  av  a 2s. c o m*/
 *    Copyright 2015 Textocat
 *
 *    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.
 */

import java.util.Collection;

public class Main {
    private static final String[] EMPTY_STRING_ARRAY = new String[0];

    public static void addPreviousTags(int index, String[] prevTags, int prevTagsToAdd,
            Collection<String> targetCol) {
        if (prevTags == null) {
            prevTags = EMPTY_STRING_ARRAY;
        }
        // sanity check - prev tags must be defined at least till index-1
        if (index - 1 >= prevTags.length) {
            throw new IllegalStateException();
        }
        for (int pt = 1; pt <= prevTagsToAdd; pt++) {
            int t = index - pt;
            if (t < 0) {
                break;
            }
            String val = new StringBuilder("pt").append(pt).append('=').append(prevTags[t]).toString();
            targetCol.add(val);
        }
    }
}

Related

1. addNonnullIfMissing(Collection collection, T element)
2. addNonNulls(Collection c, X... xl)
3. addNotNull(Collection col, String toAdd)
4. addOneValueUNSAFE(Collection cloneCollection, Object v)
5. addPrefix(Collection values, String prefix)
6. addRange(Collection c, int start, int to, int step)
7. addSafe(final Collection collection, T element)
8. addTo(Collection l, Object... os)
9. addTo(E element, C collection)