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package net.brutex.xservices.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

/**
 * A struct containing the various bits of information in a CVS root string,
 * allowing easy retrieval of individual items of information
 */
public class CVSRoot {
        public String connectionType;
        public String user;
        public String host;
        public String repository;

        public CVSRoot(String root) throws IllegalArgumentException {
                if (!root.startsWith(":"))
                        throw new IllegalArgumentException();

                int oldColonPosition = 0;
                int colonPosition = root.indexOf(':', 1);
                if (colonPosition == -1)
                        throw new IllegalArgumentException();
                connectionType = root.substring(oldColonPosition + 1, colonPosition);
                oldColonPosition = colonPosition;
                colonPosition = root.indexOf('@', colonPosition + 1);
                if (colonPosition == -1)
                        throw new IllegalArgumentException();
                user = root.substring(oldColonPosition + 1, colonPosition);
                oldColonPosition = colonPosition;
                colonPosition = root.indexOf(':', colonPosition + 1);
                if (colonPosition == -1)
                        throw new IllegalArgumentException();
                host = root.substring(oldColonPosition + 1, colonPosition);
                repository = root.substring(colonPosition + 1);
                if (connectionType == null || user == null || host == null
                                || repository == null)
                        throw new IllegalArgumentException();
        }

        public String getCVSRoot(File directory) {
                String root = null;
                BufferedReader r = null;
                try {
                        File rootFile = new File(directory, "CVS/Root");
                        if (rootFile.exists()) {
                                r = new BufferedReader(new FileReader(rootFile));
                                root = r.readLine();
                        }
                } catch (IOException e) {
                        // ignore
                } finally {
                        try {
                                if (r != null)
                                        r.close();
                        } catch (IOException e) {
                                System.err.println("Warning: could not close CVS/Root file!");
                        }
                }
                if (root == null) {
                        root = System.getProperty("cvs.root");
                }
                return root;
        }
}

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