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Nope it doesn t reduce the capacity. EnsureCapacity only guarantees that the capacity is at least what you ask for, so it does nothing if there s more than you need. OK, so StringBuilder is going to accumulate the string for us, making sure there s enough space as we go along. What about finishing off the method we were writing so that it tidies up that user input as it goes along The first thing we d like to do is to correct that mistake where the user seems to have misspelled nobler as nobelr .

To create a mashup with the Technorati block, select Create Stuff Mashup from the main menu. The mashup creator opens with the familiar blank canvas (see Figure 10-13).

Find-and-replace is a very common requirement when processing strings. Fortunately, the .NET Framework provides us with a couple of options. If we just want to find a piece of text we can use one of several overloads of the IndexOf method. This takes some text for which to look, and an index at which to start looking. By calling the method repeatedly, using the last index returned as the basis of the start index for the next search, we can find all instances of the relevant text in the input string, as Example 10-71 shows.

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StringTokenizer st = new StringTokenizer (request, " "); command = st.nextToken(); pathname = st.nextToken(); if (command.equals("GET")) { /* If the request is a GET, try to respond with the file the user is requesting. */ serveFile (osw,pathname); } else { /* If the request is a NOT a GET, return an error saying this server does not implement the requested command. */ osw.write ("HTTP/1.0 501 Not Implemented\n\n"); } /* Close the connection to the client. */ osw.close(); } public void serveFile (OutputStreamWriter osw, String pathname) throws Exception { FileReader fr = null; int c = -1; StringBuffer sb = new StringBuffer(); /* Remove the initial slash at the beginning of the pathname in the request. */ if (pathname.charAt(0) == '/') pathname = pathname.substring(1); /* If there was no filename specified by the client, serve the "index.html" file. */ if (pathname.equals("")) pathname = "index.html"; /* Try to open file specified by pathname. */ try { fr = new FileReader (pathname); c = fr.read(); } catch (Exception e) { /* If the file is not found, return the appropriate HTTP response code. */

string inputString = "If a dog and a man go into a bar, " + "is it necessarily the beginning of a joke "; int index = 1; do { index += 1; index = inputString.IndexOf(" a ", index); Console.WriteLine(index); } while (index >= 0);

This produces the output:

2 12 26 68 1

Notice how the method returns 1 when it cannot find a further match. That s finding content. What we really want to be able to do is to replace content, though. As you might expect, string also offers us a Replace function, which is shown in Example 10-72.

109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 }

string original = "Original text."; string replaced = original.Replace("Original", "Replaced"); Console.WriteLine(original); Console.WriteLine(replaced);

This takes any match for the first parameter found in the source, and replaces it with the text in the second parameter. In this case, the output looks like this:

start the replacement; both of these are common requirements in text processing. Fortunately, StringBuilder has a family of Replace methods which address all of these issues, performing an in-place replace with optional start index and number of replacements to make. Remember that we had the code shown in Example 10-73.

string[] strings = SoliloquizeLikeAUser(); StringBuilder output = new StringBuilder(); foreach (string line in strings) { // Do something to look at the line... // then... output.AppendLine(line); } Console.WriteLine(output.ToString());

We can now add our replacement line, by adding the code in Example 10-74 just before the final output to the console.

Minimize the Tutorial window by clicking the >> button. Expand the My Blocks section of the Blocks window, and locate the MyTechnoratiBlock block. Drag and drop it onto the canvas (see Figure 10-14). Place the mouse over the block to show the block s help tip. The operation we wrote, getSearchResults, is the default and only operation displayed, with its sole parameter query and the default value of Popfly. Double-click the block to display the simple view of the operation (see Figure 10-15), which shows the information we defined in the block description. There is no drop-down menu of operations, because our block has only one. The description of the operation, also retrieved from our block definition, is displayed before the operation name. The parameters list displays the query variable, and the default value Popfly has been entered in the textbox.

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