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/*
* Copyright 2003-2019 MarkLogic Corporation
*
* 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.
*/
package com.marklogic.io;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
public class IOHelper {
private IOHelper() {
// cannot be instantiated
}
public static BufferedReader newReader(String value) {
return (new BufferedReader(new StringReader(value)));
}
public static InputStream newStream(String value) {
return (new ByteArrayInputStream(getUtf8Bytes(value)));
}
public static String literalStringFromReader(Reader reader) throws IOException {
int SBUF_INIT_SIZE = 32;
StringBuilder sb = new StringBuilder(SBUF_INIT_SIZE);
char[] buf = new char[10240];
int rc;
while ((rc = reader.read(buf)) > 0) {
sb.append(buf, 0, rc);
}
buf = null; // encourage immediate memory re-use
if (sb.length() <= SBUF_INIT_SIZE) {
return sb.toString();
}
// Most strings are relatively small.
// Doing this insures the returned String is exactly the size
// of the number of chars read.
return sb.substring(0);
}
public static String literalStringFromStream(InputStream is) throws IOException {
return (literalStringFromReader(new BufferedReader(newUtf8StreamReader(is))));
}
public static String stringFromReader(BufferedReader br) throws IOException {
StringBuffer sb = new StringBuffer();
String line = null;
while ((line = br.readLine()) != null) {
if (sb.length() != 0) {
sb.append("\n");
}
sb.append(line);
}
return sb.substring(0);
}
public static String stringFromStream(InputStream is) throws IOException {
return (stringFromReader(new BufferedReader(newUtf8StreamReader(is))));
}
public static InputStream newUtf8Stream(String s) {
try {
return (new ByteArrayInputStream(s.getBytes("UTF-8")));
} catch (UnsupportedEncodingException e) {
// This is extrememly unlikely to happen, UTF-8 is required on all compliant JVMs
return (new ByteArrayInputStream(s.getBytes()));
}
}
public static Reader newUtf8StreamReader(InputStream is) {
try {
return (new InputStreamReader(is, "UTF-8"));
} catch (UnsupportedEncodingException e) {
// This is extrememly unlikely to happen, UTF-8 is required on all compliant JVMs
return (new InputStreamReader(is));
}
}
public static BufferedReader newBufferedUtf8Reader(InputStream stream) {
return new BufferedReader(newUtf8StreamReader(stream));
}
public static byte[] byteArrayFromStream(InputStream inputStream) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buffer = new byte[10240];
int rc;
while ((rc = inputStream.read(buffer)) > 0) {
bos.write(buffer, 0, rc);
}
return (bos.toByteArray());
}
// -------------------------------------------------------
public static String genericExceptionMessage(Exception e) {
String message = e.getMessage();
if (message == null) {
message = e.getClass().getName();
}
return message;
}
// ---------------------------------------------------------
@SuppressWarnings("deprecation")
public static String urlDecodeString(String value) {
try {
return URLDecoder.decode(value, "UTF-8");
} catch (UnsupportedEncodingException e) {
// should never happen, UFT-8 must be present
return URLDecoder.decode(value);
}
}
@SuppressWarnings("deprecation")
public static void urlEncodeToStringBuffer(StringBuffer sb, String value) {
try {
urlEncodeStringToStringBuffer(value, sb, "UTF-8");
} catch (UnsupportedEncodingException e) {
// should never happen, UFT-8 must be present
sb.append(URLEncoder.encode(value));
}
}
/**
* Implement a "soft" encode, which hex encodes non-printable chars, '+', '&' and '=' but not
* other special chars.
*
* @param s
* string to be "soft" encoded.
* @param encoding
* @return the string after the "soft" encoding has been applied.
*/
public static String urlEncodeString(String s, String encoding) throws UnsupportedEncodingException {
StringBuffer sb = new StringBuffer();
urlEncodeStringToStringBuffer(s, sb, encoding);
return sb.substring(0);
}
/**
* This is a "quick" URL encoder. If the string contains only ascii printable chars, then a
* lightweight routine is used to encode the string. Otherwise, the standard library URL encoder
* is used.
*
* @param s
* string to be "soft" encoded.
* @param sb
* A StringBuffer to which the encoded characters will be appended.
* @param encoding
*/
public static void urlEncodeStringToStringBuffer(String s, StringBuffer sb, String encoding)
throws UnsupportedEncodingException {
if (containsNonAscii(s)) {
// non-ascii chars seen, use the charset-aware library encoder
sb.append(URLEncoder.encode(s, encoding));
return;
}
int len = s.length();
for (int i = 0; i < len; i++) {
char c = s.charAt(i);
if (c == ' ') {
// space is a special case
sb.append("+");
continue;
}
if (needsEncoding(c)) {
hexEncodeCharToStringBuffer(sb, c);
continue;
}
sb.append(c);
}
}
// -----------------------------------------------------
private static boolean needsEncoding(char c) {
if (Character.isLetterOrDigit(c)) {
return (false);
}
if ((c == '*') || (c == '_') || (c == '.') || (c == '-')) {
return (false);
}
return (true);
}
private static boolean containsNonAscii(String s) {
int len = s.length();
for (int i = 0; i < len; i++) {
if (s.charAt(i) > 0x7f) {
return (true);
}
}
return (false);
}
private static void hexEncodeCharToStringBuffer(StringBuffer sb, char c) {
sb.append("%");
String hex = Integer.toHexString(c).toUpperCase();
if (hex.length() == 1) {
sb.append("0");
}
sb.append(hex);
}
private static byte[] getUtf8Bytes(String is) {
try {
return (is.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
// This is extrememly unlikely to happen, UTF-8 is required on all compliant JVMs
return (is.getBytes());
}
}
public static String bytesToHex(byte bytes[]) {
StringBuilder buf = new StringBuilder();
for (int i = 0; i < bytes.length; i++) {
String hex = Integer.toHexString((bytes[i]) & 0xff);
if (hex.length() == 1) {
buf.append('0');
}
buf.append(hex);
}
return buf.toString();
}
}
