Example usage for java.lang CharSequence charAt

List of usage examples for java.lang CharSequence charAt

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Introduction

In this page you can find the example usage for java.lang CharSequence charAt.

Prototype

char charAt(int index);

Source Link

Document

Returns the char value at the specified index.

Usage

From source file:org.orekit.propagation.analytical.tle.TLE.java

/** Compute the checksum of the first 68 characters of a line.
 * @param line line to check//from   w  w w. j  a va 2  s  . c o  m
 * @return checksum
 */
private static int checksum(final CharSequence line) {
    int sum = 0;
    for (int j = 0; j < 68; j++) {
        final char c = line.charAt(j);
        if (Character.isDigit(c)) {
            sum += Character.digit(c, 10);
        } else if (c == '-') {
            ++sum;
        }
    }
    return sum % 10;
}

From source file:org.cleverbus.common.Strings.java

/**
 * @param input the input/*from w  w w  .  j  a v  a  2s .c  om*/
 * @param c the searched character
 * @return the index or -1
 * @since 3.8.2
 */
public static int indexOf(CharSequence input, char c) {
    if (input instanceof String) {
        return ((String) input).indexOf(c);
    }
    for (int i = 0; i < input.length(); i++) {
        if (c == input.charAt(i)) {
            return i;
        }
    }
    return -1;
}

From source file:cn.knet.showcase.demos.servletproxy.ProxyServlet.java

/**
 * Encodes characters in the query or fragment part of the URI.
 *
 * <p>Unfortunately, an incoming URI sometimes has characters disallowed by the spec.  HttpClient
 * insists that the outgoing proxied request has a valid URI because it uses Java's {@link URI}.
 * To be more forgiving, we must escape the problematic characters.  See the URI class for the
 * spec./*from ww w  .j a va  2 s. c o  m*/
 *
 * @param in example: name=value&foo=bar#fragment
 */
protected static CharSequence encodeUriQuery(CharSequence in) {
    //Note that I can't simply use URI.java to encode because it will escape pre-existing escaped things.
    StringBuilder outBuf = null;
    Formatter formatter = null;
    for (int i = 0; i < in.length(); i++) {
        char c = in.charAt(i);
        boolean escape = true;
        if (c < 128) {
            if (asciiQueryChars.get((int) c)) {
                escape = false;
            }
        } else if (!Character.isISOControl(c) && !Character.isSpaceChar(c)) {//not-ascii
            escape = false;
        }
        if (!escape) {
            if (outBuf != null)
                outBuf.append(c);
        } else {
            //escape
            if (outBuf == null) {
                outBuf = new StringBuilder(in.length() + 5 * 3);
                outBuf.append(in, 0, i);
                formatter = new Formatter(outBuf);
            }
            //leading %, 0 padded, width 2, capital hex
            formatter.format("%%%02X", (int) c);//TODO
        }
    }
    return outBuf != null ? outBuf : in;
}

From source file:io.github.hidroh.materialistic.AppUtils.java

private static CharSequence trim(CharSequence charSequence) {
    if (TextUtils.isEmpty(charSequence)) {
        return charSequence;
    }/*from   w  w w.j a v a2 s.co  m*/
    int end = charSequence.length() - 1;
    while (Character.isWhitespace(charSequence.charAt(end))) {
        end--;
    }
    return charSequence.subSequence(0, end + 1);
}

From source file:net.darkmist.alib.res.PkgRes.java

/**
 * Gets a resource path using cls's package name as the prefix.
 * @param name The name of the resource.
 * @param cls The class to get the package prefix from.
 * @return Path of a resource prefixed by the class package name.
 * @throws NullPointerException if name or cls are null.
 */// w  ww . ja v  a 2  s.c om
public static String getResourcePathFor(CharSequence name, Class<?> cls) {
    int nameLen;
    StringBuilder sb;

    if (name == null)
        throw new NullPointerException("name is null");
    if (cls == null)
        throw new NullPointerException("cls is null");
    nameLen = name.length();
    sb = new StringBuilder(cls.getName().length() + nameLen + 2);
    appendResourcePathPrefixFor(sb, cls);
    cls = null;
    if (name.charAt(0) != '/')
        sb.append(name, 1, nameLen);
    else
        sb.append(name);
    name = null;
    return sb.toString();
}

From source file:org.apache.james.jdkim.tagvalue.SignatureRecordImpl.java

public static String dkimQuotedPrintableDecode(CharSequence input) throws IllegalArgumentException {
    StringBuilder sb = new StringBuilder(input.length());
    // TODO should we fail on WSP that is not part of FWS?
    // the specification in 2.6 DKIM-Quoted-Printable is not
    // clear//from www  .ja v a 2 s  .  co m
    int state = 0;
    int start = 0;
    int d = 0;
    boolean lastWasNL = false;
    for (int i = 0; i < input.length(); i++) {
        if (lastWasNL && input.charAt(i) != ' ' && input.charAt(i) != '\t') {
            throw new IllegalArgumentException("Unexpected LF not part of an FWS");
        }
        lastWasNL = false;
        switch (state) {
        case 0:
            switch (input.charAt(i)) {
            case ' ':
            case '\t':
            case '\r':
            case '\n':
                if ('\n' == input.charAt(i))
                    lastWasNL = true;
                sb.append(input.subSequence(start, i));
                start = i + 1;
                // ignoring whitespace by now.
                break;
            case '=':
                sb.append(input.subSequence(start, i));
                state = 1;
                break;
            }
            break;
        case 1:
        case 2:
            if (input.charAt(i) >= '0' && input.charAt(i) <= '9'
                    || input.charAt(i) >= 'A' && input.charAt(i) <= 'F') {
                int v = Arrays.binarySearch("0123456789ABCDEF".getBytes(), (byte) input.charAt(i));
                if (state == 1) {
                    state = 2;
                    d = v;
                } else {
                    d = d * 16 + v;
                    sb.append((char) d);
                    state = 0;
                    start = i + 1;
                }
            } else {
                throw new IllegalArgumentException("Invalid input sequence at " + i);
            }
        }
    }
    if (state != 0) {
        throw new IllegalArgumentException("Invalid quoted printable termination");
    }
    sb.append(input.subSequence(start, input.length()));
    return sb.toString();
}

From source file:org.ocpsoft.rewrite.servlet.config.proxy.ProxyServlet.java

/**
 * Encodes characters in the query or fragment part of the URI.
 * //w ww .ja  v a 2 s . co  m
 * <p>
 * Unfortunately, an incoming URI sometimes has characters disallowed by the spec. HttpClient insists that the
 * outgoing proxied request has a valid URI because it uses Java's {@link URI}. To be more forgiving, we must escape
 * the problematic characters. See the URI class for the spec.
 * 
 * @param in example: name=value&foo=bar#fragment
 */
protected static CharSequence encodeUriQuery(CharSequence in) {
    /*
     * Note that I can't simply use URI.java to encode because it will escape pre-existing escaped things. TODO:
     * replace/compare to with Rewrite Encoding
     */
    StringBuilder outBuf = null;
    Formatter formatter = null;
    for (int i = 0; i < in.length(); i++) {
        char c = in.charAt(i);
        boolean escape = true;
        if (c < 128) {
            if (asciiQueryChars.get(c)) {
                escape = false;
            }
        } else if (!Character.isISOControl(c) && !Character.isSpaceChar(c)) {
            /*
             * not-ascii
             */
            escape = false;
        }
        if (!escape) {
            if (outBuf != null)
                outBuf.append(c);
        } else {
            /*
             * escape
             */
            if (outBuf == null) {
                outBuf = new StringBuilder(in.length() + 5 * 3);
                outBuf.append(in, 0, i);
                formatter = new Formatter(outBuf);
            }
            /*
             * leading %, 0 padded, width 2, capital hex
             */
            formatter.format("%%%02X", (int) c);// TODO
        }
    }
    return outBuf != null ? outBuf : in;
}

From source file:org.apache.poi.util.StringUtil.java

/**
 * Count number of occurrences of needle in haystack
 * Has same signature as org.apache.commons.lang3.StringUtils#countMatches
 *
 * @param haystack  the CharSequence to check, may be null
 * @param needle    the character to count the quantity of 
 * @return the number of occurrences, 0 if the CharSequence is null
 *//*  ww w.  ja  va2  s . c  om*/
public static int countMatches(CharSequence haystack, char needle) {
    if (haystack == null)
        return 0;
    int count = 0;
    final int length = haystack.length();
    for (int i = 0; i < length; i++) {
        if (haystack.charAt(i) == needle) {
            count++;
        }
    }
    return count;
}

From source file:com.gmail.walles.johan.batterylogger.BatteryPlotFragment.java

private static CharSequence trimTrailingWhitespace(CharSequence source) {
    int i = source.length();

    // loop back to the first non-whitespace character
    while (--i >= 0 && Character.isWhitespace(source.charAt(i))) {
        // This block intentionally left blank
    }/*from   w  ww.  j a v a2  s. c  o  m*/

    return source.subSequence(0, i + 1);
}

From source file:hrytsenko.csv.IO.java

static CsvSchema.Builder getSchema(Map<String, ?> args) {
    CharSequence separator = (CharSequence) args.get("separator");
    if (separator == null) {
        separator = ",";
    }/*from   w  w w  .  j a v a  2  s . c o  m*/
    if (separator.length() != 1) {
        throw new IllegalArgumentException("Use single character as separator.");
    }

    CharSequence qualifier = (CharSequence) args.get("qualifier");
    if (qualifier == null) {
        qualifier = "\"";
    }
    if (qualifier.length() != 1) {
        throw new IllegalArgumentException("Use single character as qualifier.");
    }

    CsvSchema.Builder schema = CsvSchema.builder();
    schema.setColumnSeparator(separator.charAt(0));
    schema.setQuoteChar(qualifier.charAt(0));
    return schema;
}