/*
* Copyright (C) 2011 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.web.controller.router;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.gatein.common.io.UndeclaredIOException;
/**
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
*/
class Path {
static Path parse(String path) {
try {
Data data = new Data(path);
return new Path(data, 0);
} catch (IOException e) {
throw new UndeclaredIOException(e);
}
}
/** Constant. */
public static final Path SLASH = Path.parse("/");
private static final class Data {
private int hex(char c) {
if (c >= '0' && c <= '9') {
return c - '0';
} else if (c >= 'A' && c <= 'F') {
return c + 10 - 'A';
} else if (c >= 'a' && c <= 'f') {
return c + 10 - 'a';
} else {
throw new IllegalArgumentException("Invalid hex code in " + rawValue);
}
}
/** . */
private final String rawValue;
/** . */
private final String value;
/** . */
private final int[] mapping;
private Data(String rawValue) throws IOException, IllegalArgumentException {
this.rawValue = rawValue;
//
int len = rawValue.length();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int[] mapping = new int[len];
int count = 0;
//
int i = 0;
while (i < len) {
char c = rawValue.charAt(i);
mapping[count++] = i;
//
if (PercentEncoding.PATH_SEGMENT.accept(c)) {
baos.write((int) c);
i++;
} else if (c == '%') {
if (i + 2 >= len) {
throw new IllegalArgumentException("Invalid percent escape in " + rawValue);
}
int h = (hex(rawValue.charAt(i + 1)) << 4) + hex(rawValue.charAt(i + 2));
baos.write(h);
i += 3;
// Compute the number of bytes to read for this char
int size = 0;
for (int j = h; (j & 0x80) != 0; j = j << 1) {
size++;
}
if (size == 0) {
size = 1;
} else if (size > 6) {
throw new IllegalArgumentException("Invalid percent escape in " + rawValue);
}
// Compute the offset we need to read those bytes
int to = i + (size - 1) * 3;
if (to > len) {
throw new IllegalArgumentException("Invalid percent escape in " + rawValue);
}
// Read what we need
while (i < to) {
if (rawValue.charAt(i) != '%') {
throw new IllegalArgumentException("Invalid percent escape in " + rawValue);
}
h = (hex(rawValue.charAt(i + 1)) << 4) + hex(rawValue.charAt(i + 2));
baos.write(h);
i += 3;
}
} else if (c == '/') {
baos.write('/');
i++;
} else {
throw new IllegalArgumentException("Unsupported char value in path " + (int) c + " / " + c);
}
}
//
this.value = baos.toString("UTF-8");
this.mapping = mapping;
}
int getRawStart(int index) {
if (index < 0) {
throw new IndexOutOfBoundsException("No negative index accepted");
}
if (index >= value.length()) {
throw new IndexOutOfBoundsException("Index can't be greater than length");
}
return mapping[index];
}
int getRawEnd(int index) {
if (index < 0) {
throw new IndexOutOfBoundsException("No negative index accepted");
}
if (index >= value.length()) {
throw new IndexOutOfBoundsException("Index can't be greater than length");
}
index++;
if (index == value.length()) {
return rawValue.length();
} else {
return mapping[index];
}
}
}
/** . */
private final Data data;
/** . */
private final int offset;
/** . */
private final String value;
private Path(Data data, int offset) {
this.data = data;
this.offset = offset;
this.value = data.value.substring(offset);
}
String getValue() {
return value;
}
int getRawStart(int index) {
return data.getRawStart(innerIndex(index)) - data.getRawStart(offset);
}
int getRawEnd(int index) {
return data.getRawEnd(innerIndex(index)) - data.getRawStart(offset);
}
int getRawLength(int index) {
return getRawEnd(index) - getRawStart(index);
}
char charAt(int pos) {
return value.charAt(pos);
}
int length() {
return value.length();
}
int indexOf(int c, int index) {
return value.indexOf(c, index);
}
Path subPath(int index) {
if (index < 0) {
throw new IndexOutOfBoundsException("No negative index accepted");
} else if (index == 0) {
return this;
} else {
int i = offset + index;
if (i >= data.value.length()) {
throw new IndexOutOfBoundsException("Index can't be greater than length");
}
return new Path(data, i);
}
}
/**
* Convert the specified index to the internal index.
*
* @param outterIndex the outter index
* @return the inner index value
* @throws IndexOutOfBoundsException if the outter index is not correct
*/
private int innerIndex(int outterIndex) throws IndexOutOfBoundsException {
if (outterIndex < 0) {
throw new IndexOutOfBoundsException("No negative index accepted");
}
int pos = offset + outterIndex;
if (pos > data.value.length()) {
throw new IndexOutOfBoundsException("Index can't be greater than length");
}
return pos;
}
}