externaljavacompiler.java

Java的面向对象数据库系统的源代码

// You can redistribute this software and/or modify it under the terms of
// the Ozone Library License version 1 published by ozone-db.org.
//
// The original code and portions created by SMB are
// Copyright (C) 1997-@year@ by SMB GmbH. All rights reserved.
//
// $Id: ExternalJavaCompiler.java,v 1.2.2.1 2004/01/11 20:42:34 per_nyfelt Exp $
package org.ozoneDB.tools.OPP.compiler;

import java.util.Collection;
import java.util.Arrays;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.InputStream;

/**
 * Compiles resolver by starting an externalcompiler process.
 */
public class ExternalJavaCompiler extends AbstractJavaCompiler {

    private String compilerCommand;

    /**
     * @param compilerCommand The command to run the compiler..
     */
    public ExternalJavaCompiler(String compilerCommand) {
        this.compilerCommand = compilerCommand;
    }

    /**
     * Compiles the classes passed as strings in the classes parameter.
     * @param classes The classes to compile
     * @throws CompilerException
     */
    public void compile(Collection classes) throws CompilerException {
        String args[] = getArguments(compilerCommand, classes);
        Process process = null;
        try {
            process = Runtime.getRuntime().exec(args);
            process.waitFor();
        } catch (IOException e) {
            throw new CompilerException("Failed to start compiler: " + e.getMessage(), args);
        } catch (InterruptedException e) {
            throw new CompilerException("Failed to start compiler: " + e.getMessage(), args);
        }
        if (process.exitValue() != 0) {
            String output = streamToString(process.getInputStream());
            String error = streamToString(process.getErrorStream());

            // Either plug in a messageWriter or use some other logging (like log4j here)
            System.out.println("Error running compiler: " + error);
            System.out.println("compiling source " + getSourcePath() + " to " + getOutputPath());
            System.out.println("output: " + output);
            System.out.println("args: " + Arrays.asList(args));
            throw new CompilerException("Failed to compile generated resolver", args);
        }
    }

    private String streamToString(InputStream stream) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
            String result = null;

            try {
                String temp = reader.readLine();
                while (temp != null ) {
                    result += " " + temp;
                    temp = reader.readLine();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        return result;
    }
}