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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.olingo.odata2.testutil.helper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.Random;
import org.apache.http.HttpEntity;
import org.apache.olingo.odata2.testutil.TestUtilRuntimeException;
/**
*
*/
public class StringHelper {
public static class Stream {
private final byte[] data;
private Stream(final byte[] data) {
this.data = data;
}
public Stream(final String content, final String charset) throws UnsupportedEncodingException {
this(content.getBytes(charset));
}
public InputStream asStream() {
return new ByteArrayInputStream(data);
}
public byte[] asArray() {
return data;
}
public String asString() {
return asString("UTF-8");
}
public String asString(final String charsetName) {
return new String(data, Charset.forName(charsetName));
}
public Stream print(final OutputStream out) throws IOException {
out.write(data);
return this;
}
public Stream print() throws IOException {
return print(System.out);
}
public String asStringWithLineSeparation(String separator) throws IOException {
BufferedReader br = new BufferedReader(new StringReader(asString()));
StringBuilder sb = new StringBuilder(br.readLine());
String line = br.readLine();
while (line != null) {
sb.append(separator).append(line);
line = br.readLine();
}
return sb.toString();
}
public InputStream asStreamWithLineSeparation(String separator) throws IOException {
String asString = asStringWithLineSeparation(separator);
return new ByteArrayInputStream(asString.getBytes("UTF-8"));
}
/**
* Number of lines separated by line breaks (<code>CRLF</code>).
* A content string like <code>text\r\nmoreText</code> will result in
* a line count of <code>2</code>.
*
* @return lines count
*/
public int linesCount() {
return StringHelper.countLines(asString(), "\r\n");
}
}
public static Stream toStream(final InputStream stream) throws IOException {
byte[] result = new byte[0];
byte[] tmp = new byte[8192];
int readCount = stream.read(tmp);
while (readCount >= 0) {
byte[] innerTmp = new byte[result.length + readCount];
System.arraycopy(result, 0, innerTmp, 0, result.length);
System.arraycopy(tmp, 0, innerTmp, result.length, readCount);
result = innerTmp;
readCount = stream.read(tmp);
}
stream.close();
return new Stream(result);
}
public static Stream toStream(final String content) {
return toStream(content, "utf-8");
}
public static Stream toStream(final String content, final String charset) {
try {
return new Stream(content, charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("UTF-8 should be supported on each system.");
}
}
public static String inputStreamToString(final InputStream in, final boolean preserveLineBreaks) throws IOException {
final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in, Charset.forName("UTF-8")));
final StringBuilder stringBuilder = new StringBuilder();
String line = null;
while ((line = bufferedReader.readLine()) != null) {
stringBuilder.append(line);
if (preserveLineBreaks) {
stringBuilder.append("\n");
}
}
bufferedReader.close();
final String result = stringBuilder.toString();
return result;
}
public static String inputStreamToStringCRLFLineBreaks(final InputStream in) throws IOException {
final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in, Charset.forName("UTF-8")));
final StringBuilder stringBuilder = new StringBuilder();
String line = null;
while ((line = bufferedReader.readLine()) != null) {
stringBuilder.append(line);
stringBuilder.append("\r\n");
}
bufferedReader.close();
final String result = stringBuilder.toString();
return result;
}
public static int countLines(final String content) {
return countLines(content, "\r\n");
}
public static int countLines(final String content, final String lineBreak) {
if (content == null) {
return -1;
}
int lastPos = content.indexOf(lineBreak);
int count = 1;
while (lastPos >= 0) {
lastPos = content.indexOf(lineBreak, lastPos + 1);
count++;
}
return count;
}
public static String inputStreamToString(final InputStream in) throws IOException {
return inputStreamToString(in, false);
}
public static String httpEntityToString(final HttpEntity entity) throws IOException, IllegalStateException {
return inputStreamToString(entity.getContent());
}
/**
* Encapsulate given content in an {@link InputStream} with charset <code>UTF-8</code>.
*
* @param content to encapsulate content
* @return content as stream
*/
public static InputStream encapsulate(final String content) {
try {
return encapsulate(content, "UTF-8");
} catch (UnsupportedEncodingException e) {
// we know that UTF-8 is supported
throw new TestUtilRuntimeException("UTF-8 MUST be supported.", e);
}
}
/**
* Encapsulate given content in an {@link InputStream} with given charset.
*
* @param content to encapsulate content
* @param charset to be used charset
* @return content as stream
* @throws UnsupportedEncodingException if charset is not supported
*/
public static InputStream encapsulate(final String content, final String charset)
throws UnsupportedEncodingException {
return new ByteArrayInputStream(content.getBytes(charset));
}
/**
* Generate a string with given length containing random upper case characters ([A-Z]).
*
* @param len length of to generated string
* @return random upper case characters ([A-Z]).
*/
public static InputStream generateDataStream(final int len) {
return encapsulate(generateData(len));
}
/**
* Generates a string with given length containing random upper case characters ([A-Z]).
* @param len length of the generated string
* @return random upper case characters ([A-Z])
*/
public static String generateData(final int len) {
Random random = new Random();
StringBuilder b = new StringBuilder(len);
for (int j = 0; j < len; j++) {
final char c = (char) ('A' + random.nextInt('Z' - 'A' + 1));
b.append(c);
}
return b.toString();
}
}