Examples of org.apache.http.message.BasicHeaderElement

org.apache.http.message.BasicHeaderElement
One element of an HTTP header's value.
Some HTTP headers (such as the set-cookie header) have values that can be decomposed into multiple elements. Such headers must be in the following form:
```
 header  = [ element ] *( "," [ element ] ) element = name [ "=" [ value ] ] *( ";" [ param ] ) param   = name [ "=" [ value ] ] name    = token value   = ( token | quoted-string ) token         = 1*<any char except "=", ",", ";", <"> and white space> quoted-string = <"> *( text | quoted-char ) <"> text          = any char except <"> quoted-char   = "\" char 
```
Any amount of white space is allowed between any part of the header, element or param and is ignored. A missing value in any element or param will be stored as the empty {@link String}; if the "=" is also missing null will be stored instead.

This class represents an individual header element, containing both a name/value pair (value may be null) and optionally a set of additional parameters.
@author B.C. Holmes @author Park, Sung-Gu @author Mike Bowler @author Oleg Kalnichevski @version $Revision: 604625 $ $Date: 2007-12-16 15:11:11 +0100 (Sun, 16 Dec 2007) $ @since 4.0

        List<NameValuePair> params = new ArrayList<NameValuePair>(); 
        while (!cursor.atEnd()) {
            NameValuePair param = this.nvpParser.parseNameValuePair(buffer, cursor, DELIMITERS);
            params.add(param);
        }
        return new BasicHeaderElement(
                nvp.getName(), 
                nvp.getValue(), params.toArray(new NameValuePair[params.size()]));
    }

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


    public void testConstructor() throws Exception {
        HeaderElement element = new BasicHeaderElement("name", "value", 
                new NameValuePair[] {
                    new BasicNameValuePair("param1", "value1"),
                    new BasicNameValuePair("param2", "value2")
                } );
        assertEquals("name", element.getName());
        assertEquals("value", element.getValue());
        assertEquals(2, element.getParameters().length);
        assertEquals("value1", element.getParameterByName("param1").getValue());
        assertEquals("value2", element.getParameterByName("param2").getValue());
    }

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        assertEquals("value1", element.getParameterByName("param1").getValue());
        assertEquals("value2", element.getParameterByName("param2").getValue());
    }


    public void testConstructor2() throws Exception {
        HeaderElement element = new BasicHeaderElement("name", "value");
        assertEquals("name", element.getName());
        assertEquals("value", element.getValue());
        assertEquals(0, element.getParameters().length);
    }

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        assertEquals("value1", element.getParameterByName("param1").getValue());
    }
    
    public void testInvalidName() {
        try {
            new BasicHeaderElement(null, null, null); 
            fail("IllegalArgumentException should have been thrown");
        } catch (IllegalArgumentException ex) {
            //expected
        }
    }

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            //expected
        }
    }


    public void testHashCode() {
        HeaderElement element1 = new BasicHeaderElement("name", "value", 
                new NameValuePair[] {
                    new BasicNameValuePair("param1", "value1"),
                    new BasicNameValuePair("param2", "value2")
                } );
        HeaderElement element2 = new BasicHeaderElement("name", "value", 
                new NameValuePair[] {
                    new BasicNameValuePair("param2", "value2"),
                    new BasicNameValuePair("param1", "value1")
                } );
        HeaderElement element3 = new BasicHeaderElement("name", "value"); 
        HeaderElement element4 = new BasicHeaderElement("name", "value"); 
        HeaderElement element5 = new BasicHeaderElement("name", "value", 
                new NameValuePair[] {
                    new BasicNameValuePair("param1", "value1"),
                    new BasicNameValuePair("param2", "value2")
                } );
        assertTrue(element1.hashCode() != element2.hashCode());
        assertTrue(element1.hashCode() != element3.hashCode());
        assertTrue(element2.hashCode() != element3.hashCode());
        assertTrue(element3.hashCode() == element4.hashCode());
        assertTrue(element1.hashCode() == element5.hashCode());
    }

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        assertTrue(element3.hashCode() == element4.hashCode());
        assertTrue(element1.hashCode() == element5.hashCode());
    }
    
    public void testEquals() {
        HeaderElement element1 = new BasicHeaderElement("name", "value", 
                new NameValuePair[] {
                    new BasicNameValuePair("param1", "value1"),
                    new BasicNameValuePair("param2", "value2")
                } );
        HeaderElement element2 = new BasicHeaderElement("name", "value", 
                new NameValuePair[] {
                    new BasicNameValuePair("param2", "value2"),
                    new BasicNameValuePair("param1", "value1")
                } );
        HeaderElement element3 = new BasicHeaderElement("name", "value"); 
        HeaderElement element4 = new BasicHeaderElement("name", "value"); 
        HeaderElement element5 = new BasicHeaderElement("name", "value", 
                new NameValuePair[] {
                    new BasicNameValuePair("param1", "value1"),
                    new BasicNameValuePair("param2", "value2")
                } );
        assertTrue(element1.equals(element1));

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        NameValuePair param1 = new BasicNameValuePair("param", "regular_stuff"); 
        NameValuePair param2 = new BasicNameValuePair("param", "this\\that"); 
        NameValuePair param3 = new BasicNameValuePair("param", "this,that");
        NameValuePair param4 = new BasicNameValuePair("param", null);
        NameValuePair[] params = new NameValuePair[] {param1, param2, param3, param4};
        HeaderElement element = new BasicHeaderElement("name", "value", params); 
        
        assertEquals("name=value; param=regular_stuff; param=\"this\\\\that\"; param=\"this,that\"; param", 
                BasicHeaderElement.format(element));
    }

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    public void testElementArrayFormatting() throws Exception {
        NameValuePair param1 = new BasicNameValuePair("param", "regular_stuff"); 
        NameValuePair param2 = new BasicNameValuePair("param", "this\\that"); 
        NameValuePair param3 = new BasicNameValuePair("param", "this,that");
        NameValuePair param4 = new BasicNameValuePair("param", null);
        HeaderElement element1 = new BasicHeaderElement("name1", "value1", new NameValuePair[] {param1}); 
        HeaderElement element2 = new BasicHeaderElement("name2", "value2", new NameValuePair[] {param2}); 
        HeaderElement element3 = new BasicHeaderElement("name3", "value3", new NameValuePair[] {param3}); 
        HeaderElement element4 = new BasicHeaderElement("name4", "value4", new NameValuePair[] {param4}); 
        HeaderElement element5 = new BasicHeaderElement("name5", null); 
        HeaderElement[] elements = new HeaderElement[] {element1, element2, element3, element4, element5}; 
        
        assertEquals("name1=value1; param=regular_stuff, name2=value2; " +
                "param=\"this\\\\that\", name3=value3; param=\"this,that\", " +
                "name4=value4; param, name5",

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                BasicHeaderElement.formatAll(elements));
    }
    
    public void testFormatInvalidInput() throws Exception {
        try {
            BasicHeaderElement.format(null, new BasicHeaderElement("name1", "value1"));
            fail("IllegalArgumentException should habe been thrown");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        try {
            BasicHeaderElement.format(new CharArrayBuffer(10), (HeaderElement) null);
            fail("IllegalArgumentException should habe been thrown");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        try {
            BasicHeaderElement.formatAll(null, new HeaderElement[] {new BasicHeaderElement("name1", "value1")});
            fail("IllegalArgumentException should habe been thrown");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        try {

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        List<NameValuePair> params = new ArrayList<NameValuePair>(); 
        while (!cursor.atEnd()) {
            NameValuePair param = this.nvpParser.parseNameValuePair(buffer, cursor, DELIMITERS);
            params.add(param);
        }
        return new BasicHeaderElement(
                nvp.getName(), 
                nvp.getValue(), params.toArray(new NameValuePair[params.size()]));
    }

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