/**
 * Find Security Bugs
 * Copyright (c) Philippe Arteau, All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */
package com.h3xstream.findsecbugs.taintanalysis;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * Helper class for loading configured taint method and class summaries
 */
public class TaintConfigLoader {

    /**
     * Loads the summaries and do what is specified
     * 
     * @param input input stream with configured summaries
     * @param receiver specifies the action for each summary when loaded
     * @throws IOException if cannot read the stream or the format is bad
     */
    public void load(InputStream input, TaintConfigReceiver receiver) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(input, "UTF-8"));
        for (;;) {
            String line = reader.readLine();
            if (line == null) {
                break;
            }
            line = line.trim();
            if (line.isEmpty()) {
                continue;
            }
            putFromLine(line, receiver);
        }
    }

    private void putFromLine(String line, TaintConfigReceiver receiver) throws IOException {
        if (line.startsWith("-")) {
            // for comments or removing summary temporarily
            return;
        }
        String[] tuple = line.split("\\:");
        if (tuple.length != 2) {
            throw new IOException("Line format is not 'type signature:config info': " + line);
        }
        receiver.receiveTaintConfig(tuple[0].trim(), tuple[1]);
    }

    /**
     * Specifies what to do for each loaded summary
     */
    public interface TaintConfigReceiver {
        void receiveTaintConfig(String typeSignature, String config) throws IOException;
    }
}