package org.apache.harmony.tests.java.lang.reflect;

import dalvik.annotation.AndroidOnly;
import dalvik.system.DexFile;

import junit.framework.TestCase;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.GenericSignatureFormatError;
import java.lang.reflect.TypeVariable;

import tests.support.Support_ClassLoader;

public class GenericSignatureFormatErrorTest extends TestCase{

    public void test_Constructor() {
        assertNotNull(new GenericSignatureFormatError());
    }

    public void test_readResource() throws Exception {
        File tf = File.createTempFile("classes", ".dex");
        // System.out.println("GenericSignatureFormatErrorTest:"
        //         +tf.getAbsolutePath()+", canRead: "+tf.canRead()
        //         +", canWrite: "+tf.canWrite());
        InputStream is = this.getClass().getResourceAsStream("/resources/dex1.bytes");
        assertNotNull(is);
    }


    @AndroidOnly("Uses Android specific class dalvik.system.DexFile " +
            "for loading classes.")
    // SideEffect: strange issue (exception: 'could not open dex file', 
    //  dalvikvm: 'waitpid failed' log msg  - only occurs when @SideEffect is removed 
    // and this test is run via running tests.luni.AllTestsLang TestSuite
    public void test_signatureFormatError() throws Exception {
        /*
         * dex1.bytes is a jar file with a classes.dex in it.
         * the classes.dex was javac'ed, dx'ed and patched
         * with the following java file:
         *
         * package demo;
         *  public class HelloWorld<U> {
         *      public HelloWorld(U t) {}
         *  }
         *
         * patch:
         * the string constant (class generics signature string)
         *  "<U:" was changed to "<<:"
         *
         */

        File tf = File.createTempFile("classes", ".dex");
        // System.out.println("GenericSignatureFormatErrorTest:" +
        //         tf.getAbsolutePath() + ", canRead: " + tf.canRead() +
        //         ", canWrite: "+tf.canWrite());
        InputStream is = this.getClass().getResourceAsStream("/resources/dex1.bytes");
        assertNotNull(is);
        OutputStream fos = new FileOutputStream(tf);
        copy(is, fos);
        fos.flush();
        fos.close();


        // class signature string "<U:" was changed to "<<:"
        //System.out.println("file length:"+tf.length());
        try {
            // Was:
            // DexFile df = new DexFile(tf);
            // Class clazz = df.loadClass("demo/HelloWorld", this.getClass().getClassLoader());

            ClassLoader cl = Support_ClassLoader.getInstance(tf.toURL(),
                    getClass().getClassLoader());

            Class clazz = cl.loadClass("demo/HelloWorld");
            TypeVariable[] tvs = clazz.getTypeParameters();
            fail("expecting a GenericSignatureFormatError");
            // for (TypeVariable tv : tvs) {
            //     System.out.println("tv:"+tv.toString());
            // }
        } catch (GenericSignatureFormatError gsfe) {
            // expected
        }
    }

    private void copy(InputStream is, OutputStream os) {
        try {
            int b;
            while ((b = is.read()) != -1) {
                os.write(b);
            }
            is.close();
        } catch (IOException ex) {
            throw new RuntimeException("io error", ex);
        }
    }
}