package org.objectweb.asm.optimizer;

import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.TypePath;

/**
 * A {@link ClassVisitor} that collects the {@link Constant}s of the classes it
 * visits.
 * 
 * @author Eric Bruneton
 */
public class ClassConstantsCollector extends ClassVisitor {

  private final ConstantPool cp;

  public ClassConstantsCollector(final ClassVisitor cv, final ConstantPool cp) {
    super(Opcodes.ASM5, cv);
    this.cp = cp;
  }

  @Override
  public void visit(final int version, final int access, final String name, final String signature, final String superName,
      final String[] interfaces) {
    if ((access & Opcodes.ACC_DEPRECATED) != 0) {
      cp.newUTF8("Deprecated");
    }
    if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
      cp.newUTF8("Synthetic");
    }
    cp.newClass(name);
    if (signature != null) {
      cp.newUTF8("Signature");
      cp.newUTF8(signature);
    }
    if (superName != null) {
      cp.newClass(superName);
    }
    if (interfaces != null) {
      for (int i = 0; i < interfaces.length; ++i) {
        cp.newClass(interfaces[i]);
      }
    }
    cv.visit(version, access, name, signature, superName, interfaces);
  }

  @Override
  public void visitSource(final String source, final String debug) {
    if (source != null) {
      cp.newUTF8("SourceFile");
      cp.newUTF8(source);
    }
    if (debug != null) {
      cp.newUTF8("SourceDebugExtension");
    }
    cv.visitSource(source, debug);
  }

  @Override
  public void visitOuterClass(final String owner, final String name, final String desc) {
    cp.newUTF8("EnclosingMethod");
    cp.newClass(owner);
    if (name != null && desc != null) {
      cp.newNameType(name, desc);
    }
    cv.visitOuterClass(owner, name, desc);
  }

  @Override
  public AnnotationVisitor visitAnnotation(final String desc, final boolean visible) {
    cp.newUTF8(desc);
    if (visible) {
      cp.newUTF8("RuntimeVisibleAnnotations");
    } else {
      cp.newUTF8("RuntimeInvisibleAnnotations");
    }
    return new AnnotationConstantsCollector(cv.visitAnnotation(desc, visible), cp);
  }

  @Override
  public AnnotationVisitor visitTypeAnnotation(int typeRef, TypePath typePath, String desc, boolean visible) {
    cp.newUTF8(desc);
    if (visible) {
      cp.newUTF8("RuntimeVisibleTypeAnnotations");
    } else {
      cp.newUTF8("RuntimeInvisibleTypeAnnotations");
    }
    return new AnnotationConstantsCollector(cv.visitAnnotation(desc, visible), cp);
  }

  @Override
  public void visitAttribute(final Attribute attr) {
    // can do nothing
    cv.visitAttribute(attr);
  }

  @Override
  public void visitInnerClass(final String name, final String outerName, final String innerName, final int access) {
    cp.newUTF8("InnerClasses");
    if (name != null) {
      cp.newClass(name);
    }
    if (outerName != null) {
      cp.newClass(outerName);
    }
    if (innerName != null) {
      cp.newUTF8(innerName);
    }
    cv.visitInnerClass(name, outerName, innerName, access);
  }

  @Override
  public FieldVisitor visitField(final int access, final String name, final String desc, final String signature, final Object value) {
    if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
      cp.newUTF8("Synthetic");
    }
    if ((access & Opcodes.ACC_DEPRECATED) != 0) {
      cp.newUTF8("Deprecated");
    }
    cp.newUTF8(name);
    cp.newUTF8(desc);
    if (signature != null) {
      cp.newUTF8("Signature");
      cp.newUTF8(signature);
    }
    if (value != null) {
      cp.newConst(value);
    }
    return new FieldConstantsCollector(cv.visitField(access, name, desc, signature, value), cp);
  }

  @Override
  public MethodVisitor visitMethod(final int access, final String name, final String desc, final String signature, final String[] exceptions) {
    if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
      cp.newUTF8("Synthetic");
    }
    if ((access & Opcodes.ACC_DEPRECATED) != 0) {
      cp.newUTF8("Deprecated");
    }
    cp.newUTF8(name);
    cp.newUTF8(desc);
    if (signature != null) {
      cp.newUTF8("Signature");
      cp.newUTF8(signature);
    }
    if (exceptions != null) {
      cp.newUTF8("Exceptions");
      for (int i = 0; i < exceptions.length; ++i) {
        cp.newClass(exceptions[i]);
      }
    }
    return new MethodConstantsCollector(cv.visitMethod(access, name, desc, signature, exceptions), cp);
  }
}