Android example source code file (WebAddress.java)

This example Android source code file (WebAddress.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

bad, logtag, match_group_authority, match_group_host, match_group_path, match_group_port, match_group_scheme, matcher, nullpointerexception, numberformatexception, parseexception, pattern, regex, string, webaddress

The WebAddress.java Android example source code

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed 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 android.net;

import static android.util.Patterns.GOOD_IRI_CHAR;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * {@hide}
 *
 * Web Address Parser
 *
 * This is called WebAddress, rather than URL or URI, because it
 * attempts to parse the stuff that a user will actually type into a
 * browser address widget.
 *
 * Unlike java.net.uri, this parser will not choke on URIs missing
 * schemes.  It will only throw a ParseException if the input is
 * really hosed.
 *
 * If given an https scheme but no port, fills in port
 *
 */
public class WebAddress {

    private final static String LOGTAG = "http";

    public String mScheme;
    public String mHost;
    public int mPort;
    public String mPath;
    public String mAuthInfo;

    static final int MATCH_GROUP_SCHEME = 1;
    static final int MATCH_GROUP_AUTHORITY = 2;
    static final int MATCH_GROUP_HOST = 3;
    static final int MATCH_GROUP_PORT = 4;
    static final int MATCH_GROUP_PATH = 5;

    static Pattern sAddressPattern = Pattern.compile(
            /* scheme    */ "(?:(http|https|file)\\:\\/\\/)?" +
            /* authority */ "(?:([-A-Za-z0-9$_.+!*'(),;?&=]+(?:\\:[-A-Za-z0-9$_.+!*'(),;?&=]+)?)@)?" +
            /* host      */ "([-" + GOOD_IRI_CHAR + "%_]+(?:\\.[-" + GOOD_IRI_CHAR + "%_]+)*|\\[[0-9a-fA-F:\\.]+\\])?" +
            /* port      */ "(?:\\:([0-9]*))?" +
            /* path      */ "(\\/?[^#]*)?" +
            /* anchor    */ ".*", Pattern.CASE_INSENSITIVE);

    /** parses given uriString. */
    public WebAddress(String address) throws ParseException {
        if (address == null) {
            throw new NullPointerException();
        }

        // android.util.Log.d(LOGTAG, "WebAddress: " + address);

        mScheme = "";
        mHost = "";
        mPort = -1;
        mPath = "/";
        mAuthInfo = "";

        Matcher m = sAddressPattern.matcher(address);
        String t;
        if (m.matches()) {
            t = m.group(MATCH_GROUP_SCHEME);
            if (t != null) mScheme = t.toLowerCase();
            t = m.group(MATCH_GROUP_AUTHORITY);
            if (t != null) mAuthInfo = t;
            t = m.group(MATCH_GROUP_HOST);
            if (t != null) mHost = t;
            t = m.group(MATCH_GROUP_PORT);
            if (t != null && t.length() > 0) {
                // The ':' character is not returned by the regex.
                try {
                    mPort = Integer.parseInt(t);
                } catch (NumberFormatException ex) {
                    throw new ParseException("Bad port");
                }
            }
            t = m.group(MATCH_GROUP_PATH);
            if (t != null && t.length() > 0) {
                /* handle busted myspace frontpage redirect with
                   missing initial "/" */
                if (t.charAt(0) == '/') {
                    mPath = t;
                } else {
                    mPath = "/" + t;
                }
            }

        } else {
            // nothing found... outa here
            throw new ParseException("Bad address");
        }

        /* Get port from scheme or scheme from port, if necessary and
           possible */
        if (mPort == 443 && mScheme.equals("")) {
            mScheme = "https";
        } else if (mPort == -1) {
            if (mScheme.equals("https"))
                mPort = 443;
            else
                mPort = 80; // default
        }
        if (mScheme.equals("")) mScheme = "http";
    }

    public String toString() {
        String port = "";
        if ((mPort != 443 && mScheme.equals("https")) ||
            (mPort != 80 && mScheme.equals("http"))) {
            port = ":" + Integer.toString(mPort);
        }
        String authInfo = "";
        if (mAuthInfo.length() > 0) {
            authInfo = mAuthInfo + "@";
        }

        return mScheme + "://" + authInfo + mHost + port + mPath;
    }
}