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/*
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* Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.net;
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/**
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* Helper class to map URL "abbreviations" to real URLs.
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* The default implementation supports the following mappings:
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* ftp.mumble.bar/... => ftp://ftp.mumble.bar/...
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* gopher.mumble.bar/... => gopher://gopher.mumble.bar/...
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* other.name.dom/... => http://other.name.dom/...
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* /foo/... => file:/foo/...
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*
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* Full URLs (those including a protocol name) are passed through unchanged.
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*
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* Subclassers can override or extend this behavior to support different
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* or additional canonicalization policies.
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*
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* @author Steve Byrne
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*/
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public class URLCanonicalizer {
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/**
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* Creates the default canonicalizer instance.
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*/
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public URLCanonicalizer() { }
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/**
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* Given a possibly abbreviated URL (missing a protocol name, typically),
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* this method's job is to transform that URL into a canonical form,
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* by including a protocol name and additional syntax, if necessary.
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*
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* For a correctly formed URL, this method should just return its argument.
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*/
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public String canonicalize(String simpleURL) {
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String resultURL = simpleURL;
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if (simpleURL.startsWith("ftp.")) {
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resultURL = "ftp://" + simpleURL;
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} else if (simpleURL.startsWith("gopher.")) {
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resultURL = "gopher://" + simpleURL;
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} else if (simpleURL.startsWith("/")) {
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resultURL = "file:" + simpleURL;
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} else if (!hasProtocolName(simpleURL)) {
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if (isSimpleHostName(simpleURL)) {
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simpleURL = "www." + simpleURL + ".com";
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}
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resultURL = "http://" + simpleURL;
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}
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return resultURL;
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}
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/**
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* Given a possibly abbreviated URL, this predicate function returns
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* true if it appears that the URL contains a protocol name
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*/
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public boolean hasProtocolName(String url) {
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int index = url.indexOf(':');
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if (index <= 0) { // treat ":foo" as not having a protocol spec
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return false;
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}
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for (int i = 0; i < index; i++) {
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char c = url.charAt(i);
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// REMIND: this is a guess at legal characters in a protocol --
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// need to be verified
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if ((c >= 'A' && c <= 'Z')
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|| (c >= 'a' && c <= 'z')
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|| (c == '-')) {
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continue;
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}
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// found an illegal character
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return false;
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}
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return true;
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}
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/**
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* Returns true if the URL is just a single name, no periods or
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* slashes, false otherwise
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**/
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protected boolean isSimpleHostName(String url) {
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for (int i = 0; i < url.length(); i++) {
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char c = url.charAt(i);
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// REMIND: this is a guess at legal characters in a protocol --
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// need to be verified
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if ((c >= 'A' && c <= 'Z')
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|| (c >= 'a' && c <= 'z')
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|| (c >= '0' && c <= '9')
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|| (c == '-')) {
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continue;
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}
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// found an illegal character
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return false;
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}
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return true;
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}
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}
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