Monday, November 17, 2008

ImageMagick DSL 2

This is a quick post that shows another way to work with the ImageMagick DSL (and other Java DSLs). It comes from a trick I saw in a DSL talk given by Neal Ford. Basically you can use initializer blocks to construct objects in a bit less verbose way:

new ImageMagick() {{
option("-rotate", "90");
option("-resize", width + "x");
}}.run(in, out);


This still requires external variables, such as width, need to be declared final. So to wrap up, here's three different ways to invoke the DSL:

Standard:

ImageMagick convert = new ImageMagick();
convert.option("-rotate", "90");
convert.option("-resize", width + "x");
convert.run(in, out);


Method Chaining:

new ImageMagick().option("-rotate", "90").option("-resize", width + "x").run(in, out);


Initializer Block:

new ImageMagick() {{
option("-rotate", "90");
option("-resize", width + "x");
}}.run(in, out);

1 comment:

donald said...
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