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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * http://www.netbeans.org/cddl-gplv2.html
 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
 * specific language governing permissions and limitations under the
 * License.  When distributing the software, include this License Header
 * Notice in each file and include the License file at
 * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the GPL Version 2 section of the License file that
 * accompanied this code. If applicable, add the following below the
 * License Header, with the fields enclosed by brackets [] replaced by
 * your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 *
 * Contributor(s):
 *
 * The Original Software is NetBeans. The Initial Developer of the Original
 * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
 * Microsystems, Inc. All Rights Reserved.
 *
 * If you wish your version of this file to be governed by only the CDDL
 * or only the GPL Version 2, indicate your decision by adding
 * "[Contributor] elects to include this software in this distribution
 * under the [CDDL or GPL Version 2] license." If you do not indicate a
 * single choice of license, a recipient has the option to distribute
 * your version of this file under either the CDDL, the GPL Version 2 or
 * to extend the choice of license to its licensees as provided above.
 * However, if you add GPL Version 2 code and therefore, elected the GPL
 * Version 2 license, then the option applies only if the new code is
 * made subject to such option by the copyright holder.
 */

package org.netbeans.nbbuild.extlibs;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;

/**
 * Creates a license file for use in NBM generation.
 * The standard license file is written first.
 * Any named extra licenses, from the licenses dir, are appended.
 * Any project properties which are found beginning with "release.external." are also used;
 * the remainder of the property name should be a binary name in the project's external dir,
 * and a matching license notice is looked for in that dir.
 */
public class ReleaseFilesLicense extends Task {

    private File license;
    public void setLicense(File license) {
        this.license = license;
    }

    private File standardLicense;
    public void setStandardLicense(File standardLicense) {
        this.standardLicense = standardLicense;
    }

    private String extraLicenseFiles;
    public void setExtraLicenseFiles(String extraLicenseFiles) {
        this.extraLicenseFiles = extraLicenseFiles;
    }

    public @Override void execute() throws BuildException {
        try {
            OutputStream os = new FileOutputStream(license);
            try {
                PrintWriter pw = new PrintWriter(new OutputStreamWriter(os, "UTF-8"));
                pw.println("License for NetBeans module:");
                pw.println();
                append(pw, standardLicense);
                for (String name : extraLicenseFiles.split("[, ]+")) {
                    File f = getProject().resolveFile(name);
                    if (!f.isFile()) {
                        log("No such license: " + f, Project.MSG_WARN);
                        continue;
                    }
                    pw.println();
                    pw.println();
                    pw.println("==================================================");
                    pw.println("Additional license (" + f.getName() + "):");
                    pw.println();
                    InputStream is = new FileInputStream(f);
                    try {
                        BufferedReader r = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                        String line;
                        while ((line = r.readLine()) != null && line.length() > 0) {}
                        while ((line = r.readLine()) != null) {
                            pw.println(line);
                        }
                    } finally {
                        is.close();
                    }
                }
                Map<File,Set<String>> inferredLicenses = new TreeMap<File,Set<String>>();
                RELEASE_FILE: for (Map.Entry<?,?> entry : ((Map<?,?>) getProject().getProperties()).entrySet()) {
                    String k = (String) entry.getKey();
                    // XXX this does not work for release.../external/*; need to maybe match ^release\.(.+/)?external/
                    if (k.startsWith("release.external/")) {
                        String binary = k.substring("release.external/".length()).replaceFirst("!/.+$", "");
                        File d = getProject().resolveFile("external");
                        for (File possibleLicense : d.listFiles()) {
                            if (!possibleLicense.getName().endsWith("-license.txt")) {
                                continue;
                            }
                            InputStream is = new FileInputStream(possibleLicense);
                            try {
                                BufferedReader r = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                                String files = possibleLicense.getName().replaceFirst("-license\\.txt$", ".jar") +
                                        " " + possibleLicense.getName().replaceFirst("-license\\.txt$", ".zip");
                                String line;
                                while ((line = r.readLine()) != null && line.length() > 0) {
                                    Matcher m = Pattern.compile("Files: (.+)").matcher(line);
                                    if (m.matches()) {
                                        files = m.group(1);
                                        break;
                                    }
                                }
                                if (Arrays.asList(files.split("[, ]+")).contains(binary)) {
                                    Set<String> binaries = inferredLicenses.get(possibleLicense);
                                    if (binaries == null) {
                                        binaries = new TreeSet<String>();
                                        inferredLicenses.put(possibleLicense, binaries);
                                    }
                                    binaries.add((String) entry.getValue());
                                    continue RELEASE_FILE;
                                }
                            } finally {
                                is.close();
                            }
                        }
                    }
                }
                for (Map.Entry<File,Set<String>> entry : inferredLicenses.entrySet()) {
                    pw.println();
                    pw.println();
                    pw.println("==================================================");
                    pw.println("Additional license (" + entry.getKey().getName() + ") associated with the following files:");
                    for (String binary : entry.getValue()) {
                        pw.println(binary);
                    }
                    pw.println();
                    InputStream is = new FileInputStream(entry.getKey());
                    try {
                        BufferedReader r = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                        String line;
                        while ((line = r.readLine()) != null && line.length() > 0) {}
                        while ((line = r.readLine()) != null) {
                            pw.println(line);
                        }
                    } finally {
                        is.close();
                    }
                }
                pw.flush();
            } finally {
                os.close();
            }
        } catch (IOException x) {
            throw new BuildException(x, getLocation());
        }
    }

    private void append(PrintWriter pw, File f) throws IOException {
        InputStream is = new FileInputStream(f);
        try {
            BufferedReader r = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            String line;
            while ((line = r.readLine()) != null) {
                pw.println(line);
            }
        } finally {
            is.close();
        }
    }

}
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