Find the string value of an attribute starting at position k in a text string, returning the string value of the attribute, or null if the attribute is not present. - Java java.lang

Java examples for java.lang:String XML

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Description

Find the string value of an attribute starting at position k in a text string, returning the string value of the attribute, or null if the attribute is not present.

Demo Code

/*---------------------------------------------------------------
 *  Copyright 2005 by the Radiological Society of North America
 *
 *  This source software is released under the terms of the
 *  RSNA Public License (http://mirc.rsna.org/rsnapubliclicense)
 *----------------------------------------------------------------*/


//package com.java2s;

public class Main {


    /**//from ww w  .  ja va  2s.c o  m
     * Find the string value of an attribute starting at position k in
     * a text string, returning the string value of the attribute, or
     * null if the attribute is not present. Note: this method returns
     * the value of the attribute with normalized whitespace.
     * @param text the XML string.
     * @param k the starting point in the XML string to search for the attribute.
     * @param attr the name of the attribute.
     * @return the string value of the attribute, or null if the attribute is not
     * present.
     */
    public static String getAttribute(String text, int k, String attr) {
        int kk = text.indexOf(">", k);
        if (kk < 0)
            return null;
        String t = text.substring(k, kk).replaceAll("\\s+", " ")
                .replaceAll(" =", "=").replaceAll("= ", "=");
        k = t.indexOf(" " + attr + "=");
        if (k < 0)
            return null;
        k = t.indexOf("=", k) + 2;
        if (t.charAt(k - 1) != '"')
            return null;
        kk = t.indexOf("\"", k);
        if (kk < 0)
            return null;
        return t.substring(k, kk);
    }
}

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