/*
 * $HeadURL$
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 * $Date$
 * 
 * ====================================================================
 *
 *  Copyright 1999-2006 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.util;

import java.io.InputStream;
import java.io.ByteArrayInputStream;

import org.apache.http.Header;
import org.apache.http.entity.BasicHttpEntity;
import org.apache.http.message.BasicHeader;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

/**
 * Unit tests for {@link EntityUtils}.
 *
 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
 */
public class TestEntityUtils extends TestCase {

    public TestEntityUtils(String testName) {
        super(testName);
    }

    public static void main(String args[]) {
        String[] testCaseName = { TestEntityUtils.class.getName() };
        junit.textui.TestRunner.main(testCaseName);
    }

    public static Test suite() {
        return new TestSuite(TestEntityUtils.class);
    }

    public void testNullEntityToByteArray() throws Exception {
        try {
            EntityUtils.toByteArray(null);
            fail("IllegalArgumentException should have been thrown");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }
    
    public void testEmptyContentToByteArray() throws Exception {
        NullHttpEntity httpentity = new NullHttpEntity();
        byte[] bytes = EntityUtils.toByteArray(httpentity);
        assertNotNull(bytes);
        assertEquals(0, bytes.length);
    }
    
    public void testMaxIntContentToByteArray() throws Exception {
        byte[] content = "Message content".getBytes("ISO-8859-1");
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContent(new ByteArrayInputStream(content));
        httpentity.setContentLength(Integer.MAX_VALUE + 100L);
        try {
            EntityUtils.toByteArray(httpentity);
            fail("IllegalArgumentException should have been thrown");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }
    
    public void testUnknownLengthContentToByteArray() throws Exception {
        byte[] bytes = "Message content".getBytes("ISO-8859-1");
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContent(new ByteArrayInputStream(bytes));
        httpentity.setContentLength(-1L);
        byte[] bytes2 = EntityUtils.toByteArray(httpentity);
        assertNotNull(bytes2);
        assertEquals(bytes.length, bytes2.length);
        for (int i = 0; i < bytes.length; i++) {
            assertEquals(bytes[i], bytes2[i]);
        }
    }
    
    public void testKnownLengthContentToByteArray() throws Exception {
        byte[] bytes = "Message content".getBytes("ISO-8859-1");
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContent(new ByteArrayInputStream(bytes));
        httpentity.setContentLength(bytes.length);
        byte[] bytes2 = EntityUtils.toByteArray(httpentity);
        assertNotNull(bytes2);
        assertEquals(bytes.length, bytes2.length);
        for (int i = 0; i < bytes.length; i++) {
            assertEquals(bytes[i], bytes2[i]);
        }
    }

    public void testNullEntityGetContentCharset() throws Exception {
        try {
            EntityUtils.getContentCharSet(null);
            fail("IllegalArgumentException should have been thrown");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }
    
    public void testNullContentTypeGetContentCharset() throws Exception {
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContentType((Header)null);
        assertNull(EntityUtils.getContentCharSet(httpentity));
    }
    
    public void testNoCharsetGetContentCharset() throws Exception {
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContentType(new BasicHeader("Content-Type", "text/plain; param=yadayada"));
        assertNull(EntityUtils.getContentCharSet(httpentity));
    }
    
    public void testGetContentCharset() throws Exception {
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContentType(new BasicHeader("Content-Type", "text/plain; charset = UTF-8"));
        assertEquals("UTF-8", EntityUtils.getContentCharSet(httpentity));
    }
    
    public void testNullEntityToString() throws Exception {
        try {
            EntityUtils.toString(null);
            fail("IllegalArgumentException should have been thrown");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }
    
    public void testEmptyContentToString() throws Exception {
        NullHttpEntity httpentity = new NullHttpEntity();
        String s = EntityUtils.toString(httpentity);
        assertNotNull(s);
        assertEquals("", s);
    }
        
    public void testMaxIntContentToString() throws Exception {
        byte[] content = "Message content".getBytes("ISO-8859-1");
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContent(new ByteArrayInputStream(content));
        httpentity.setContentLength(Integer.MAX_VALUE + 100L);
        try {
            EntityUtils.toString(httpentity);
            fail("IllegalArgumentException should have been thrown");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }
    
    public void testUnknownLengthContentToString() throws Exception {
        byte[] bytes = "Message content".getBytes("ISO-8859-1");
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContent(new ByteArrayInputStream(bytes));
        httpentity.setContentLength(-1L);
        String s = EntityUtils.toString(httpentity, "ISO-8859-1");
        assertEquals("Message content", s);
    }

    public void testKnownLengthContentToString() throws Exception {
        byte[] bytes = "Message content".getBytes("ISO-8859-1");
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContent(new ByteArrayInputStream(bytes));
        httpentity.setContentLength(bytes.length);
        String s = EntityUtils.toString(httpentity, "ISO-8859-1");
        assertEquals("Message content", s);
    }

    static final int SWISS_GERMAN_HELLO [] = {
        0x47, 0x72, 0xFC, 0x65, 0x7A, 0x69, 0x5F, 0x7A, 0xE4, 0x6D, 0xE4
    };
        
    static final int RUSSIAN_HELLO [] = {
        0x412, 0x441, 0x435, 0x43C, 0x5F, 0x43F, 0x440, 0x438, 
        0x432, 0x435, 0x442 
    }; 
    
    private static String constructString(int [] unicodeChars) {
        StringBuffer buffer = new StringBuffer();
        if (unicodeChars != null) {
            for (int i = 0; i < unicodeChars.length; i++) {
                buffer.append((char)unicodeChars[i]); 
            }
        }
        return buffer.toString();
    }

    public void testNoCharsetContentToString() throws Exception {
        String content = constructString(SWISS_GERMAN_HELLO);
        byte[] bytes = content.getBytes("ISO-8859-1");
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContent(new ByteArrayInputStream(bytes));
        httpentity.setContentType(new BasicHeader("Content-Type", "text/plain"));
        String s = EntityUtils.toString(httpentity);
        assertEquals(content, s);
    }
    
    public void testDefaultCharsetContentToString() throws Exception {
        String content = constructString(RUSSIAN_HELLO);
        byte[] bytes = content.getBytes("KOI8-R");
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContent(new ByteArrayInputStream(bytes));
        httpentity.setContentType(new BasicHeader("Content-Type", "text/plain"));
        String s = EntityUtils.toString(httpentity, "KOI8-R");
        assertEquals(content, s);
    }
    
    public void testContentWithContentTypeToString() throws Exception {
        String content = constructString(RUSSIAN_HELLO);
        byte[] bytes = content.getBytes("UTF-8");
        BasicHttpEntity httpentity = new BasicHttpEntity();
        httpentity.setContent(new ByteArrayInputStream(bytes));
        httpentity.setContentType(new BasicHeader("Content-Type", "text/plain; charset=UTF-8"));
        String s = EntityUtils.toString(httpentity, "ISO-8859-1");
        assertEquals(content, s);
    }

    /**
     * Helper class that returns <code>null</code> as the content.
     */
    public static class NullHttpEntity extends BasicHttpEntity {

        // default constructor
        /**
         * Obtains no content.
         * This method disables the state checks in the base class.
         *
         * @return <code>null</code>
         */
        public InputStream getContent() {
            return null;
        }
    } // class NullEntity

} // class TestEntityUtils