61 lines
2.1 KiB
Java
61 lines
2.1 KiB
Java
//: annotations/InterfaceExtractorProcessor.java
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// APT-based annotation processing.
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// {CompileTimeError} Not working in Java 8
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// {Exec: apt -factory
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// annotations.InterfaceExtractorProcessorFactory
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// Multiplier.java -s ../annotations}
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package annotations;
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import com.sun.mirror.apt.*;
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import com.sun.mirror.declaration.*;
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import java.io.*;
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import java.util.*;
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public class InterfaceExtractorProcessor
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implements AnnotationProcessor {
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private final AnnotationProcessorEnvironment env;
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private ArrayList<MethodDeclaration> interfaceMethods =
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new ArrayList<>();
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public InterfaceExtractorProcessor(
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AnnotationProcessorEnvironment env) { this.env = env; }
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public void process() {
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for(TypeDeclaration typeDecl :
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env.getSpecifiedTypeDeclarations()) {
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ExtractInterface annot =
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typeDecl.getAnnotation(ExtractInterface.class);
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if(annot == null)
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break;
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for(MethodDeclaration m : typeDecl.getMethods())
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if(m.getModifiers().contains(Modifier.PUBLIC) &&
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!(m.getModifiers().contains(Modifier.STATIC)))
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interfaceMethods.add(m);
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if(interfaceMethods.size() > 0) {
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try {
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try (PrintWriter writer = env.getFiler().createSourceFile(annot.value())) {
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writer.println("package " +
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typeDecl.getPackage().getQualifiedName() +";");
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writer.println("public interface " +
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annot.value() + " {");
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for(MethodDeclaration m : interfaceMethods) {
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writer.print(" public ");
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writer.print(m.getReturnType() + " ");
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writer.print(m.getSimpleName() + " (");
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int i = 0;
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for(ParameterDeclaration parm :
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m.getParameters()) {
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writer.print(parm.getType() + " " +
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parm.getSimpleName());
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if(++i < m.getParameters().size())
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writer.print(", ");
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}
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writer.println(");");
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}
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writer.println("}");
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}
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} catch(IOException ioe) {
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throw new RuntimeException(ioe);
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}
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}
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}
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}
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} ///:~
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