org.opencms.util.CmsUriSplitter Maven / Gradle / Ivy
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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
*
* This library 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 library 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.
*
* For further information about Alkacon Software, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.util;
import java.net.URI;
import java.net.URISyntaxException;
/**
* Splits an URI String into separate components.
*
* An URI is splitted into a prefix, a anchor and a query part.
*/
public class CmsUriSplitter {
/** Empty (non null) StringBuffer constant. */
private static final StringBuffer EMPTY_BUFFER = new StringBuffer(0);
/** The anchor part of the URI, for example someanchor. */
private String m_anchor;
/** Indicates if 'strict' URI parsing did produce an error. */
private boolean m_errorFree;
/** Indicates if 'strict' URI parsing was used. */
private boolean m_isStrict;
/** The URI protocol, for example http or https. */
private String m_protocol;
/** The prefix part of the URI, for example http://www.opencms.org/some/path/. */
private String m_prefix;
/** The query part of the URI, for example a=b&c=d. */
private String m_query;
/** The suffix part of the uri. */
private String m_suffix;
/** The original URI String that was split. */
private String m_uri;
/**
* Creates a splitted URI using the default (not strict) parsing mode.
*
* @param uri the URI to split
*/
public CmsUriSplitter(String uri) {
this(uri, false);
}
/**
* Creates a splitted URI using the given parsing mode.
*
* Using 'strict' parsing mode, all requirements for an URI are checked.
* If 'strict' is set to false, then only some simple parsing rules are applied,
* in which case the result may not be 100% valid (but still usable).
* If 'strict' parsing generates an error, then simple parsing is used as a fallback.
*
* @param uri the URI to split
* @param strict if true, then 'strict' parsing mode is used, otherwise a relaxed URI parsing is done
*/
public CmsUriSplitter(String uri, boolean strict) {
m_uri = uri;
m_errorFree = true;
m_isStrict = strict;
if (strict) {
// use strict parsing
try {
URI u = new URI(uri);
m_protocol = u.getScheme();
m_prefix = ((m_protocol != null) ? m_protocol + ":" : "") + u.getRawSchemeSpecificPart();
m_anchor = u.getRawFragment();
m_query = u.getRawQuery();
if (m_prefix != null) {
int i = m_prefix.indexOf('?');
if (i != -1) {
m_query = m_prefix.substring(i + 1);
m_prefix = m_prefix.substring(0, i);
}
}
if (m_anchor != null) {
int i = m_anchor.indexOf('?');
if (i != -1) {
m_query = m_anchor.substring(i + 1);
m_anchor = m_anchor.substring(0, i);
}
}
} catch (Exception exc) {
// may be thrown by URI constructor if URI is invalid
strict = false;
m_errorFree = false;
}
}
if ((!strict) && (uri != null)) {
// use simple parsing
StringBuffer prefix = new StringBuffer(uri.length());
StringBuffer anchor = EMPTY_BUFFER;
StringBuffer query = EMPTY_BUFFER;
int len = uri.length();
int cur = 0;
for (int i = 0; i < len; i++) {
char c = uri.charAt(i);
if ((cur == 0) && (c == ':')) {
m_protocol = prefix.toString();
}
if (c == '#') {
// start of anchor
cur = 1;
anchor = new StringBuffer(uri.length());
continue;
}
if (c == '?') {
// start of query
cur = 2;
// ensure a duplicate query part is 'flushed' (same behavior as strict parser)
query = new StringBuffer(uri.length());
continue;
}
switch (cur) {
case 1:
// append to anchor
anchor.append(c);
break;
case 2:
// append to query
query.append(c);
break;
default:
// append to prefix
prefix.append(c);
break;
}
}
if (prefix.length() > 0) {
m_prefix = prefix.toString();
}
if (anchor.length() > 0) {
m_anchor = anchor.toString();
}
if (query.length() > 0) {
m_query = query.toString();
}
}
}
/**
* Checks if the given URI is well formed.
*
* @param uri the URI to check
*
* @return true if the given URI is well formed
*/
@SuppressWarnings("unused")
public static boolean isValidUri(String uri) {
boolean result = false;
try {
new URI(uri);
result = true;
} catch (Exception e) {
// nothing to do
}
return result;
}
/**
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof CmsUriSplitter) {
CmsUriSplitter other = (CmsUriSplitter)obj;
if (!((m_protocol == other.m_protocol) || ((m_protocol != null) && m_protocol.equals(other.m_protocol)))) {
return false;
}
if (!((m_prefix == other.m_prefix) || ((m_prefix != null) && m_prefix.equals(other.m_prefix)))) {
return false;
}
if (!((m_anchor == other.m_anchor) || ((m_anchor != null) && m_anchor.equals(other.m_anchor)))) {
return false;
}
if (!((m_query == other.m_query) || ((m_query != null) && m_query.equals(other.m_query)))) {
return false;
}
return true;
}
return false;
}
/**
* Returns the anchor part of the uri, for example someanchor,
* or null if no anchor is available.
*
* @return the anchor part of the uri
*/
public String getAnchor() {
return m_anchor;
}
/**
* Returns the prefix part of the uri, for example http://www.opencms.org/some/path/,
* or null if no prefix is available.
*
* @return the prefix part of the uri
*/
public String getPrefix() {
return m_prefix;
}
/**
* Returns the URI protocol, for example http or https.
*
* @return the URI protocol
*/
public String getProtocol() {
return m_protocol;
}
/**
* Returns the query part of the uri, for example a=b&c=d,
* or null if no query is available.
*
* @return the query part of the uri
*/
public String getQuery() {
return m_query;
}
/**
* Returns the suffix part of the uri, a combination of query and anchor,
* for example ?a=b&c=d#someanchor,
* or the empty String if no suffix is available.
*
* @return the suffix part of the uri
*/
public String getSuffix() {
if (m_suffix == null) {
StringBuffer result = new StringBuffer();
if (m_query != null) {
result.append('?');
result.append(m_query);
}
if (m_anchor != null) {
result.append('#');
result.append(m_anchor);
}
m_suffix = result.toString();
}
return m_suffix;
}
/**
* Returns the URI String passed to this URI splitter.
*
* @return the URI String passed to this URI splitter
*/
public String getUri() {
return m_uri;
}
/**
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
int hashCode = 0;
if (m_prefix != null) {
hashCode += m_prefix.hashCode();
}
if (m_anchor != null) {
hashCode += m_anchor.hashCode();
}
if (m_query != null) {
hashCode += m_query.hashCode();
}
return hashCode;
}
/**
* Returns true if the URI was parsed error free in 'strict' mode,
* or if the simple mode was used.
*
* @return true if the URI was parsed error free in 'strict' mode,
* or if the simple mode was used
*/
public boolean isErrorFree() {
return m_errorFree;
}
/**
* Returns an URI object created from the original input String.
*
* This method will do a "best effort" to convert the original input String to a legal URI.
* Most notably, it will be able to handle original input Strings that contain a space " "
* and other usually illegal characters.
*
* @return an URI object created from the original input String
*
* @throws URISyntaxException in case no URI object can be created from the original input String
*/
public URI toURI() throws URISyntaxException {
if (m_isStrict && m_errorFree) {
// we have already verified that the URI contains no errors
return new URI(m_uri);
}
// create a new URI from the components
// using this constructor the input will be escaped if required
return new URI(null, m_prefix + (m_query != null ? "?" + m_query : ""), m_anchor);
}
}