Java example source code file (CleanProperties.java)

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

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, could, file, fileinputstream, fileoutputstream, hashset, ioexception, map, net, network, printstream, properties, set, string, stringbuilder, uri, util

The CleanProperties.java Java example source code

/*
 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.tools.sjavac;

import java.io.*;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.HashSet;
import java.util.Map;
import java.util.Properties;

/**
 * The clean properties transform should not be necessary.
 * Eventually we will cleanup the property file sources in the OpenJDK instead.
 *
 * <p>This is NOT part of any supported API.
 * If you write code that depends on this, you do so at your own
 * risk.  This code and its internal interfaces are subject to change
 * or deletion without notice.</b>

 */
public class CleanProperties implements Transformer
{
    public void setExtra(String e) {
        // Any extra information is ignored for clean properties.
    }

    public void setExtra(String[] a) {
        // Any extra information is ignored for clean properties.
    }

    public boolean transform(Map<String,Set pkgSrcs,
                             Set<URI>             visibleSrcs,
                             Map<URI,Set visibleClasses,
                             Map<String,Set oldPackageDependencies,
                             URI destRoot,
                             Map<String,Set    packageArtifacts,
                             Map<String,Set packageDependencies,
                             Map<String,String>      packagePublicApis,
                             int debugLevel,
                             boolean incremental,
                             int numCores,
                             PrintStream out,
                             PrintStream err)
    {
        boolean rc = true;
        for (String pkgName : pkgSrcs.keySet()) {
            String pkgNameF = pkgName.replace('.',File.separatorChar);
            for (URI u : pkgSrcs.get(pkgName)) {
                File src = new File(u);
                boolean r = clean(pkgName, pkgNameF, src, new File(destRoot), debugLevel,
                                  packageArtifacts);
                if (r == false) {
                    rc = false;
                }
            }
        }
        return rc;
    }

    boolean clean(String pkgName, String pkgNameF, File src, File destRoot, int debugLevel,
                  Map<String,Set packageArtifacts)
    {
        // Load the properties file.
        Properties p = new Properties();
        try {
            p.load(new FileInputStream(src));
        } catch (IOException e) {
            Log.error("Error reading file "+src.getPath());
            return false;
        }

        // Sort the properties in increasing key order.
        List<String> sortedKeys = new ArrayList();
        for (Object key : p.keySet()) {
            sortedKeys.add((String)key);
        }
        Collections.sort(sortedKeys);
        Iterator<String> keys = sortedKeys.iterator();

        // Collect the properties into a string buffer.
        StringBuilder data = new StringBuilder();
        while (keys.hasNext()) {
            String key = keys.next();
            data.append(CompileProperties.escape(key)+":"+CompileProperties.escape((String)p.get(key))+"\n");
        }

        String destFilename = destRoot.getPath()+File.separator+pkgNameF+File.separator+src.getName();
        File dest = new File(destFilename);

        // Make sure the dest directories exist.
        if (!dest.getParentFile().isDirectory()) {
            if (!dest.getParentFile().mkdirs()) {
                Log.error("Could not create the directory "+dest.getParentFile().getPath());
                return false;
            }
        }

        Set<URI> as = packageArtifacts.get(pkgName);
        if (as == null) {
            as = new HashSet<URI>();
            packageArtifacts.put(pkgName, as);
        }
        as.add(dest.toURI());

        if (dest.exists() && dest.lastModified() > src.lastModified()) {
            // A cleaned property file exists, and its timestamp is newer than the source.
            // Assume that we do not need to clean!
            // Thus we are done.
            return true;
        }

        Log.info("Cleaning property file "+pkgNameF+File.separator+src.getName());
        try (Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(dest)))) {
            writer.write(data.toString());
        } catch ( IOException e ) {
            Log.error("Could not write file "+dest.getPath());
            return false;
        }
        return true;
    }
}