Android String Sub String Get substringBefore(String str, String separator)

Description

substring Before

License

Apache License

Declaration

public static String substringBefore(String str, String separator) 

Method Source Code

//package com.java2s;
/**//  w  w w  .ja v a 2  s. c  o m
 * Copyright 2013 ??????
 *
 * 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.
 */

public class Main {
    public static final String EMPTY = "";
    public static final int INDEX_NOT_FOUND = -1;

    public static String substringBefore(String str, String separator) {
        if (isEmpty(str) || separator == null) {
            return str;
        }
        if (separator.length() == 0) {
            return EMPTY;
        }
        int endIndex = str.indexOf(separator);
        if (endIndex == INDEX_NOT_FOUND) {
            return str;
        }
        return str.substring(0, endIndex);
    }

    public static boolean isEmpty(String str) {
        return str == null || str.length() == 0;
    }

    public static String substring(String str, int beginIndex) {
        if (str == null) {
            return null;
        }

        if (beginIndex < 0) {
            return EMPTY;
        }

        if (beginIndex > str.length()) {
            return EMPTY;
        }

        return str.substring(beginIndex);
    }

    public static String substring(String str, int beginIndex, int endIndex) {
        if (str == null) {
            return null;
        }

        if (beginIndex < 0 || endIndex < 0) {
            return EMPTY;
        }

        if (endIndex > str.length()) {
            endIndex = str.length();
        }

        if (beginIndex > endIndex || beginIndex > str.length()) {
            return EMPTY;
        }

        return str.substring(beginIndex, endIndex);
    }
}

Related

1. replace(String s, String[] oldSubs, String[] newSubs)
2. substring(String str, int beginIndex)
3. substring(String str, int beginIndex, int endIndex)
4. substringAfter(String str, String separator)
5. substringAfterLast(String str, String separator)
6. substringBeforeLast(String str, String separator)
7. unicodePreservingSubstring(String paramString, int paramInt1, int paramInt2)
8. unicodePreservingSubstring(String str, int begin, int end)
9. unicodePreservingSubstring(String str, int begin)