-
-
Save scottcagno/11191226 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
public class CodeModelIfForExample { | |
private static final String CLASS_NAME = "TestClass"; | |
public static void main(String args[]) throws Exception{ | |
JCodeModel codeModel = new JCodeModel(); | |
JDefinedClass c = codeModel._class(CLASS_NAME); | |
writeIfElse(codeModel, c); | |
writeForLoop(codeModel, c); | |
StringCodeWriter codeWriter = new StringCodeWriter(); | |
codeModel.build(codeWriter); | |
System.out.println(codeWriter.getOutput().get(CLASS_NAME + ".java")); | |
} | |
public static void writeIfElse(JCodeModel codeModel, JDefinedClass c){ | |
JMethod method = c.method(JMod.PUBLIC, codeModel.VOID, "testIf"); | |
JVar input = method.param(codeModel.INT, "input"); | |
JBlock body = method.body(); | |
JConditional condition = body._if(input.lt(JExpr.lit(42))); | |
condition._then().add( | |
codeModel.ref(System.class).staticRef("out").invoke("println").arg(JExpr.lit("hello"))); | |
condition._else().add( | |
codeModel.ref(System.class).staticRef("out").invoke("println").arg(JExpr.lit("world"))); | |
} | |
public static void writeForLoop(JCodeModel codeModel, JDefinedClass c){ | |
JMethod method = c.method(JMod.PUBLIC, codeModel.VOID, "testFor"); | |
JVar input = method.param(int.class, "input"); | |
JBlock body = method.body(); | |
JForLoop forLoop = body._for(); | |
JVar ivar = forLoop.init(codeModel.INT, "i", JExpr.lit(0)); | |
forLoop.test(ivar.lt(JExpr.lit(42))); | |
forLoop.update(ivar.assignPlus(JExpr.lit(1))); | |
forLoop.body().add( | |
codeModel.ref(System.class).staticRef("out").invoke("println").arg(ivar)); | |
} | |
public static class StringCodeWriter extends CodeWriter { | |
private Map<String, ByteArrayOutputStream> streams = new HashMap<String, ByteArrayOutputStream>(); | |
@Override | |
public OutputStream openBinary(JPackage pkg, String fileName) throws IOException { | |
String packageFileName = pkg.name() + fileName; | |
if (!streams.containsKey(packageFileName)) { | |
streams.put(packageFileName, new ByteArrayOutputStream()); | |
} | |
return streams.get(packageFileName); | |
} | |
@Override | |
public void close() throws IOException { | |
for (OutputStream outputStream : streams.values()) { | |
outputStream.flush(); | |
outputStream.close(); | |
} | |
} | |
public String getValue(String packageFileName) { | |
return new String(streams.get(packageFileName).toByteArray()); | |
} | |
public Map<String, String> getOutput() { | |
Map<String, String> outputMap = new HashMap<String, String>(); | |
for (Map.Entry<String, ByteArrayOutputStream> byteStreamEntry : streams.entrySet()) { | |
outputMap.put(byteStreamEntry.getKey(), | |
new String(byteStreamEntry.getValue().toByteArray())); | |
} | |
return outputMap; | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment