jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/GenerateJLIClassesPlugin.java
author jlaskey
Tue, 28 Jun 2016 16:07:23 -0300
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permissions -rw-r--r--
8160459: jlink minor code clean up Reviewed-by: mchung
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/*
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 * Copyright (c) 2016, 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 jdk.tools.jlink.internal.plugins;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.EnumSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.stream.Collectors;
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import jdk.tools.jlink.plugin.ModuleEntry;
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import jdk.tools.jlink.plugin.PluginException;
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import jdk.tools.jlink.plugin.ModulePool;
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import jdk.tools.jlink.plugin.TransformerPlugin;
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/**
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 * Plugin to generate java.lang.invoke classes.
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 */
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public final class GenerateJLIClassesPlugin implements TransformerPlugin {
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    private static final String NAME = "generate-jli-classes";
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    private static final String BMH_PARAM = "bmh";
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    private static final String BMH_SPECIES_PARAM = "bmh-species";
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    private static final String DESCRIPTION = PluginsResourceBundle.getDescription(NAME);
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    private static final String BMH = "java/lang/invoke/BoundMethodHandle";
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    private static final Method FACTORY_METHOD;
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    List<String> speciesTypes;
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    public GenerateJLIClassesPlugin() {
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    }
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    @Override
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    public String getName() {
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        return NAME;
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    }
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    @Override
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    public String getDescription() {
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        return DESCRIPTION;
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    }
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    @Override
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    public Set<State> getState() {
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        return EnumSet.of(State.AUTO_ENABLED, State.FUNCTIONAL);
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    }
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    @Override
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    public boolean hasArguments() {
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        return true;
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    }
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    @Override
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    public String getArgumentsDescription() {
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       return PluginsResourceBundle.getArgument(NAME);
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    }
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    /**
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     * @return the default Species forms to generate.
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     *
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     * This list was derived from running a Java concatenating strings
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     * with -Djava.lang.invoke.stringConcat=MH_INLINE_SIZED_EXACT set
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     * plus a subset of octane. A better long-term solution is to define
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     * and run a set of quick generators and extracting this list as a
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     * step in the build process.
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     */
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    public static List<String> defaultSpecies() {
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        return List.of("LL", "L3", "L4", "L5", "L6", "L7", "L7I",
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                "L7II", "L7IIL", "L8", "L9", "L10", "L10I", "L10II", "L10IIL",
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                "L11", "L12", "L13", "LI", "D", "L3I", "LIL", "LLI", "LLIL",
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                "LILL", "I", "LLILL");
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    }
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    @Override
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    public void configure(Map<String, String> config) {
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        String mainArgument = config.get(NAME);
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        // Enable by default
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        boolean bmhEnabled = true;
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        if (mainArgument != null) {
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            Set<String> args = Arrays.stream(mainArgument.split(","))
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                    .collect(Collectors.toSet());
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            if (!args.contains(BMH_PARAM)) {
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                bmhEnabled = false;
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            }
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        }
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        if (!bmhEnabled) {
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            speciesTypes = List.of();
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        } else {
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            String args = config.get(BMH_SPECIES_PARAM);
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            List<String> bmhSpecies;
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            if (args != null && !args.isEmpty()) {
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                bmhSpecies = Arrays.stream(args.split(","))
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                    .map(String::trim)
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                    .filter(s -> !s.isEmpty())
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                    .collect(Collectors.toList());
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            } else {
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                bmhSpecies = defaultSpecies();
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            }
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            // Expand BMH species signatures
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            speciesTypes = bmhSpecies.stream()
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                    .map(type -> expandSignature(type))
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                    .collect(Collectors.toList());
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            // Validation check
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            for (String type : speciesTypes) {
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                for (char c : type.toCharArray()) {
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                    if ("LIJFD".indexOf(c) < 0) {
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                        throw new PluginException("All characters must "
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                                + "correspond to a basic field type: LIJFD");
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                    }
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                }
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            }
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        }
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    }
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    @Override
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    public void visit(ModulePool in, ModulePool out) {
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        in.entries().forEach(data -> {
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            if (("/java.base/" + BMH + ".class").equals(data.getPath())) {
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                // Add BoundMethodHandle unchanged
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                out.add(data);
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                speciesTypes.forEach(types -> generateConcreteClass(types, data, out));
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            } else {
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                if (!out.contains(data)) {
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                    out.add(data);
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                }
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            }
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        });
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    }
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    @SuppressWarnings("unchecked")
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    private void generateConcreteClass(String types, ModuleEntry data, ModulePool out) {
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        try {
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            // Generate class
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            Map.Entry<String, byte[]> result = (Map.Entry<String, byte[]>)
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                    FACTORY_METHOD.invoke(null, types);
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            String className = result.getKey();
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            byte[] bytes = result.getValue();
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            // Add class to pool
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            ModuleEntry ndata = ModuleEntry.create(
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                    "/java.base/" + className + ".class",
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                    bytes);
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            if (!out.contains(ndata)) {
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                out.add(ndata);
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            }
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        } catch (Exception ex) {
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            throw new PluginException(ex);
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        }
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    }
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    static {
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        try {
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            Class<?> BMHFactory = Class.forName("java.lang.invoke.BoundMethodHandle$Factory");
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            Method genClassMethod = BMHFactory.getDeclaredMethod("generateConcreteBMHClassBytes",
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                    String.class);
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            genClassMethod.setAccessible(true);
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            FACTORY_METHOD = genClassMethod;
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        } catch (Exception e) {
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            throw new PluginException(e);
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        }
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    }
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    // Convert LL -> LL, L3 -> LLL
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    private static String expandSignature(String signature) {
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        StringBuilder sb = new StringBuilder();
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        char last = 'X';
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        int count = 0;
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        for (int i = 0; i < signature.length(); i++) {
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            char c = signature.charAt(i);
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            if (c >= '0' && c <= '9') {
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                count *= 10;
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                count += (c - '0');
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            } else {
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                for (int j = 1; j < count; j++) {
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                    sb.append(last);
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                }
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                sb.append(c);
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                last = c;
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                count = 0;
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            }
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        }
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        for (int j = 1; j < count; j++) {
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            sb.append(last);
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        }
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        return sb.toString();
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    }
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}