001/*
002 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.debug.internal;
024
025import java.io.*;
026import java.util.*;
027
028import com.oracle.graal.debug.*;
029import com.oracle.graal.debug.DebugHistogram.*;
030
031/**
032 * Renders a histogram as an R script to a given print stream. The R script emitted for a histogram
033 * is a simple set of statements for defining a vector of named objects.
034 */
035public class DebugHistogramRPrinter implements Printer {
036
037    private PrintStream os;
038    private int limit;
039
040    public DebugHistogramRPrinter(PrintStream os) {
041        this(os, Integer.MAX_VALUE);
042    }
043
044    /**
045     * @param os where to print
046     * @param limit limits printing to the {@code limit} most frequent values
047     */
048    public DebugHistogramRPrinter(PrintStream os, int limit) {
049        this.os = os;
050        this.limit = limit;
051    }
052
053    public void print(DebugHistogram histogram) {
054        List<CountedValue> list = histogram.getValues();
055        if (list.isEmpty()) {
056            return;
057        }
058
059        String var = histogram.getName().replace('-', '.').replace(' ', '_');
060        os.print(var + " <- c(");
061        for (int i = 0; i < list.size() && i < limit; ++i) {
062            CountedValue cv = list.get(i);
063            if (i != 0) {
064                os.print(", ");
065            }
066            os.print(cv.getCount());
067        }
068        os.println(");");
069
070        os.print("names(" + var + ") <- c(");
071        for (int i = 0; i < list.size() && i < limit; ++i) {
072            CountedValue cv = list.get(i);
073            if (i != 0) {
074                os.print(", ");
075            }
076            os.print("\"" + cv.getValue() + "\"");
077        }
078        os.println(");");
079    }
080}