Java String Strip stripTags(String in)

Description

This method takes a string and strips out all tags except
tags while still leaving the tag body intact.

License

Open Source License

Parameter

Parameter	Description
in	the text to be converted.

Return

the input string with all tags removed.

Declaration

public static String stripTags(String in) 

Method Source Code

//package com.java2s;
/**//from ww  w . j av  a 2s.c o m
 * <p>
 * Simple utility class for String operations useful across the framework.
 * <p/>
 * <p>
 * Some methods in this class were copied from the Spring Framework so we didn't
 * have to re-invent the wheel, and in these cases, we have retained all
 * license, copyright and author information.
 *
 * @since 0.9
 */

import java.util.*;

public class Main {
    /**
     * Constant representing the empty string, equal to &quot;&quot;
     */
    public static final String EMPTY_STRING = "";

    /**
     * This method takes a string and strips out all tags except <br> tags while
     * still leaving the tag body intact.
     *
     * @param in the text to be converted.
     * @return the input string with all tags removed.
     */
    public static String stripTags(String in) {
        if (in == null) {
            return null;
        }
        char ch;
        int i = 0;
        int last = 0;
        char[] input = in.toCharArray();
        int len = input.length;
        StringBuilder out = new StringBuilder((int) (len * 1.3));
        for (; i < len; i++) {
            ch = input[i];
            if (ch > '>') {
            } else if (ch == '<') {
                if (i + 3 < len && input[i + 1] == 'b' && input[i + 2] == 'r' && input[i + 3] == '>') {
                    i += 3;
                    continue;
                }
                if (i > last) {
                    out.append(input, last, i - last);
                }
                last = i + 1;
            } else if (ch == '>') {
                last = i + 1;
            }
        }
        if (last == 0) {
            return in;
        }
        if (i > last) {
            out.append(input, last, i - last);
        }
        return out.toString();
    }

    /**
     * Returns the specified array as a comma-delimited (',') string.
     *
     * @param array the array whose contents will be converted to a string.
     * @return the array's contents as a comma-delimited (',') string.
     * @since 1.0
     */
    public static String toString(Object[] array) {
        return toDelimitedString(array, ",");
    }

    /**
     * Returns the array's contents as a string, with each element delimited by
     * the specified {@code delimiter} argument. Useful for {@code toString()}
     * implementations and log messages.
     *
     * @param array the array whose contents will be converted to a string
     * @param delimiter the delimiter to use between each element
     * @return a single string, delimited by the specified {@code delimiter}.
     * @since 1.0
     */
    public static String toDelimitedString(Object[] array, String delimiter) {
        if (array == null || array.length == 0) {
            return EMPTY_STRING;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < array.length; i++) {
            if (i > 0) {
                sb.append(delimiter);
            }
            sb.append(array[i]);
        }
        return sb.toString();
    }

    /**
     * Returns the collection's contents as a string, with each element
     * delimited by the specified {@code delimiter} argument. Useful for
     * {@code toString()} implementations and log messages.
     *
     * @param c the collection whose contents will be converted to a string
     * @param delimiter the delimiter to use between each element
     * @return a single string, delimited by the specified {@code delimiter}.
     * @since 1.2
     */
    public static String toDelimitedString(Collection c, String delimiter) {
        if (c == null || c.isEmpty()) {
            return EMPTY_STRING;
        }
        return join(c.iterator(), delimiter);
    }

    /**
     * Joins the elements of the provided {@code Iterator} into a single String
     * containing the provided elements.</p>
     * <p/>
     * No delimiter is added before or after the list. A {@code null} separator
     * is the same as an empty String ("").</p>
     * <p/>
     * Copied from Commons Lang, version 3 (r1138702).</p>
     *
     * @param iterator the {@code Iterator} of values to join together, may be
     * null
     * @param separator the separator character to use, null treated as ""
     * @return the joined String, {@code null} if null iterator input
     * @since 1.2
     */
    public static String join(Iterator<?> iterator, String separator) {
        final String empty = "";

        // handle null, zero and one elements before building a buffer
        if (iterator == null) {
            return null;
        }
        if (!iterator.hasNext()) {
            return empty;
        }
        Object first = iterator.next();
        if (!iterator.hasNext()) {
            return first == null ? empty : first.toString();
        }

        // two or more elements
        StringBuilder buf = new StringBuilder(256); // Java default is 16, probably too small
        if (first != null) {
            buf.append(first);
        }

        while (iterator.hasNext()) {
            if (separator != null) {
                buf.append(separator);
            }
            Object obj = iterator.next();
            if (obj != null) {
                buf.append(obj);
            }
        }
        return buf.toString();
    }
}

Related

1. stripLastElement(String str)
2. stripLeadingSlash(String str)
3. stripNamespaceDeclarations(String xml)
4. stripTags(final String tagged)
5. stripTags(String html)
6. stripTrailingChar(String input, char c)
7. stripUnsupportedChars(String str)