/*
* [The "BSD licence"]
* Copyright (c) 2013-2014 Dandelion
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Dandelion nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.github.dandelion.core.utils;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.net.URL;
import javax.servlet.http.HttpServletRequest;
import com.github.dandelion.core.DandelionException;
/**
*
* TODO
*
* @author Thibault Duchateau
* @since 0.10.0
*/
public final class ResourceUtils {
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
public static InputStream getFileFromClasspath(String pathToFile) {
return Thread.currentThread().getContextClassLoader().getResourceAsStream(pathToFile);
}
public static String getFileContentFromClasspath(String pathToFile) {
return getFileContentFromClasspath(pathToFile, true);
}
public static String getFileContentFromClasspath(String pathToFile, boolean neverFail) {
try {
InputStream in = getFileFromClasspath(pathToFile);
return getContentFromInputStream(in);
}
catch (IOException e) {
StringBuilder sb = new StringBuilder("The content pointed by the path ");
sb.append(pathToFile);
sb.append(" can't be read from an inputStream.");
throw new DandelionException(sb.toString(), e);
}
}
public static String getContentFromInputStream(InputStream input) throws IOException {
StringWriter sw = new StringWriter();
InputStreamReader in = new InputStreamReader(input);
char[] buffer = new char[DEFAULT_BUFFER_SIZE];
int n;
while (-1 != (n = in.read(buffer))) {
sw.write(buffer, 0, n);
}
return sw.toString();
}
public static String getContentFromUrl(HttpServletRequest request, String url, boolean neverFail) {
try {
if (UrlUtils.isProtocolRelative(url)) {
url = request.isSecure() ? "https:" : "http:" + url;
}
if (UrlUtils.isContextRelative(url, request)) {
url = UrlUtils.getBaseUrl(request, false) + url;
}
URL urlLocation = new URL(url);
return ResourceUtils.getContentFromInputStream(urlLocation.openStream());
}
catch (IOException e) {
if(neverFail) {
return "";
}
StringBuilder sb = new StringBuilder("The content pointed by the url ");
sb.append(url);
sb.append(" can't be read.");
throw new DandelionException(sb.toString(), e);
}
}
/**
* Prevents instantiation.
*/
private ResourceUtils() {
}
}