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 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you 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   *
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 *   http://www.apache.org/licenses/LICENSE-2.0                 *
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 * 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.                                           *
 ****************************************************************/

package org.apache.james.mime4j.util;

import org.apache.james.mime4j.util.ByteArrayBuffer;
import org.apache.james.mime4j.util.CharArrayBuffer;

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

/**
 * Unit tests for {@link CharArrayBuffer}.
 */
public class TestCharArrayBuffer extends TestCase {

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

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

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

    public void testConstructor() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(16);
        assertEquals(16, buffer.capacity()); 
        assertEquals(0, buffer.length());
        assertNotNull(buffer.buffer());
        assertEquals(16, buffer.buffer().length);
        try {
            new CharArrayBuffer(-1);
            fail("IllegalArgumentException should have been thrown");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }
    
    public void testSimpleAppend() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(16);
        assertEquals(16, buffer.capacity()); 
        assertEquals(0, buffer.length());
        char[] b1 = buffer.toCharArray();
        assertNotNull(b1);
        assertEquals(0, b1.length);
        assertTrue(buffer.isEmpty());
        assertFalse(buffer.isFull());
        
        char[] tmp = new char[] { '1', '2', '3', '4'};
        buffer.append(tmp, 0, tmp.length);
        assertEquals(16, buffer.capacity()); 
        assertEquals(4, buffer.length());
        assertFalse(buffer.isEmpty());
        assertFalse(buffer.isFull());
        
        char[] b2 = buffer.toCharArray();
        assertNotNull(b2);
        assertEquals(4, b2.length);
        for (int i = 0; i < tmp.length; i++) {
            assertEquals(tmp[i], b2[i]);
            assertEquals(tmp[i], buffer.charAt(i));
        }
        assertEquals("1234", buffer.toString());
        
        buffer.clear();
        assertEquals(16, buffer.capacity()); 
        assertEquals(0, buffer.length());
        assertTrue(buffer.isEmpty());
        assertFalse(buffer.isFull());
    }
    
    public void testExpandAppend() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(4);
        assertEquals(4, buffer.capacity()); 
        
        char[] tmp = new char[] { '1', '2', '3', '4'};
        buffer.append(tmp, 0, 2);
        buffer.append(tmp, 0, 4);
        buffer.append(tmp, 0, 0);

        assertEquals(8, buffer.capacity()); 
        assertEquals(6, buffer.length());
        
        buffer.append(tmp, 0, 4);
        
        assertEquals(16, buffer.capacity()); 
        assertEquals(10, buffer.length());
        
        assertEquals("1212341234", buffer.toString());
    }

    public void testAppendString() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(8);
        buffer.append("stuff");
        buffer.append(" and more stuff");
        assertEquals("stuff and more stuff", buffer.toString());
    }
    
    public void testAppendNullString() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(8);
        buffer.append((String)null);
        assertEquals("null", buffer.toString());
    }
    
    public void testAppendCharArrayBuffer() throws Exception {
        CharArrayBuffer buffer1 = new CharArrayBuffer(8);
        buffer1.append(" and more stuff");
        CharArrayBuffer buffer2 = new CharArrayBuffer(8);
        buffer2.append("stuff");
        buffer2.append(buffer1);
        assertEquals("stuff and more stuff", buffer2.toString());
    }
    
    public void testAppendNullCharArrayBuffer() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(8);
        buffer.append((CharArrayBuffer)null);
        buffer.append((CharArrayBuffer)null, 0, 0);
        assertEquals("", buffer.toString());
    }
    
    public void testAppendSingleChar() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(4);
        buffer.append('1');
        buffer.append('2');
        buffer.append('3');
        buffer.append('4');
        buffer.append('5');
        buffer.append('6');
        assertEquals("123456", buffer.toString());
    }
    
    public void testInvalidCharArrayAppend() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(4);
        buffer.append((char[])null, 0, 0);

        char[] tmp = new char[] { '1', '2', '3', '4'};
        try {
            buffer.append(tmp, -1, 0);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.append(tmp, 0, -1);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.append(tmp, 0, 8);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.append(tmp, 10, Integer.MAX_VALUE);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.append(tmp, 2, 4);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
    }

    public void testSetLength() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(4);
        buffer.setLength(2);
        assertEquals(2, buffer.length());
    }
    
    public void testSetInvalidLength() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(4);
        try {
            buffer.setLength(-2);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.setLength(200);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
    }

    public void testEnsureCapacity() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(4);
        buffer.ensureCapacity(2);
        assertEquals(4, buffer.capacity());
        buffer.ensureCapacity(8);
        assertEquals(8, buffer.capacity());
    }

    public void testIndexOf() {
        CharArrayBuffer buffer = new CharArrayBuffer(16);
        buffer.append("name: value");
        assertEquals(4, buffer.indexOf(':'));
        assertEquals(-1, buffer.indexOf(','));
        assertEquals(4, buffer.indexOf(':', -1, 11));
        assertEquals(4, buffer.indexOf(':', 0, 1000));
        assertEquals(-1, buffer.indexOf(':', 2, 1));
    }
    
    public void testSubstring() {
        CharArrayBuffer buffer = new CharArrayBuffer(16);
        buffer.append(" name:  value    ");
        assertEquals(5, buffer.indexOf(':'));
        assertEquals(" name", buffer.substring(0, 5));
        assertEquals("  value    ", buffer.substring(6, buffer.length()));
        assertEquals("name", buffer.substringTrimmed(0, 5));
        assertEquals("value", buffer.substringTrimmed(6, buffer.length()));
        assertEquals("", buffer.substringTrimmed(13, buffer.length()));
    }
    
    public void testSubstringIndexOfOutBound() {
        CharArrayBuffer buffer = new CharArrayBuffer(16);
        buffer.append("stuff");
        try {
            buffer.substring(-2, 10);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.substringTrimmed(-2, 10);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.substring(12, 10);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.substringTrimmed(12, 10);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.substring(2, 1);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.substringTrimmed(2, 1);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
    }    
    
    public void testAppendAsciiByteArray() throws Exception {
        String s1 = "stuff";
        String s2 = " and more stuff";
        byte[] b1 = s1.getBytes("US-ASCII");
        byte[] b2 = s2.getBytes("US-ASCII");
        
        CharArrayBuffer buffer = new CharArrayBuffer(8);
        buffer.append(b1, 0, b1.length);
        buffer.append(b2, 0, b2.length);
        
        assertEquals("stuff and more stuff", buffer.toString());
    }
    
    public void testAppendISOByteArray() throws Exception {
        byte[] b = new byte[] {0x00, 0x20, 0x7F, -0x80, -0x01};
        
        CharArrayBuffer buffer = new CharArrayBuffer(8);
        buffer.append(b, 0, b.length);
        char[] ch = buffer.toCharArray();
        assertNotNull(ch);
        assertEquals(5, ch.length);
        assertEquals(0x00, ch[0]);
        assertEquals(0x20, ch[1]);
        assertEquals(0x7F, ch[2]);
        assertEquals(0x80, ch[3]);
        assertEquals(0xFF, ch[4]);
    }
    
    public void testAppendNullByteArray() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(8);
        buffer.append((byte[])null, 0, 0);
        assertEquals("", buffer.toString());
    }

    public void testAppendNullByteArrayBuffer() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(8);
        buffer.append((ByteArrayBuffer)null, 0, 0);
        assertEquals("", buffer.toString());
    }

    public void testInvalidAppendAsciiByteArray() throws Exception {
        CharArrayBuffer buffer = new CharArrayBuffer(4);
        buffer.append((byte[])null, 0, 0);

        byte[] tmp = new byte[] { '1', '2', '3', '4'};
        try {
            buffer.append(tmp, -1, 0);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.append(tmp, 0, -1);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.append(tmp, 0, 8);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.append(tmp, 10, Integer.MAX_VALUE);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        try {
            buffer.append(tmp, 2, 4);
            fail("IndexOutOfBoundsException should have been thrown");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
    }
    
}
