// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
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package org.objectweb.asm.tree;

import java.util.List;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.TypePath;

A node that represents a field.
Author:
Eric Bruneton/**
 * A node that represents a field.
 *
 * @author Eric Bruneton
 */
public class FieldNode extends FieldVisitor {

  
The field's access flags (see Opcodes). This field also indicates if the field is synthetic and/or deprecated. /**
   * The field's access flags (see {@link org.objectweb.asm.Opcodes}). This field also indicates if
   * the field is synthetic and/or deprecated.
   */
  public int access;

  
The field's name. /** The field's name. */
  public String name;

  
The field's descriptor (see Type). /** The field's descriptor (see {@link org.objectweb.asm.Type}). */
  public String desc;

  
The field's signature. May be null. /** The field's signature. May be {@literal null}. */
  public String signature;

  
The field's initial value. This field, which may be null if the field does not have an initial value, must be an Integer, a Float, a Long, a Double or a String. /**
   * The field's initial value. This field, which may be {@literal null} if the field does not have
   * an initial value, must be an {@link Integer}, a {@link Float}, a {@link Long}, a {@link Double}
   * or a {@link String}.
   */
  public Object value;

  
The runtime visible annotations of this field. May be null. /** The runtime visible annotations of this field. May be {@literal null}. */
  public List<AnnotationNode> visibleAnnotations;

  
The runtime invisible annotations of this field. May be null. /** The runtime invisible annotations of this field. May be {@literal null}. */
  public List<AnnotationNode> invisibleAnnotations;

  
The runtime visible type annotations of this field. May be null. /** The runtime visible type annotations of this field. May be {@literal null}. */
  public List<TypeAnnotationNode> visibleTypeAnnotations;

  
The runtime invisible type annotations of this field. May be null. /** The runtime invisible type annotations of this field. May be {@literal null}. */
  public List<TypeAnnotationNode> invisibleTypeAnnotations;

  
The non standard attributes of this field. * May be null. /** The non standard attributes of this field. * May be {@literal null}. */
  public List<Attribute> attrs;

  
Constructs a new FieldNode. Subclasses must not use this constructor. Instead, they must use the FieldNode(int, int, String, String, String, Object) version. 
Params:
access – the field's access flags (see Opcodes). This parameter also indicates if the field is synthetic and/or deprecated.
name – the field's name.
descriptor – the field's descriptor (see Type).
signature – the field's signature.
value – the field's initial value. This parameter, which may be null if the field does not have an initial value, must be an Integer, a Float, a Long, a Double or a String.
Throws:
IllegalStateException – If a subclass calls this constructor./**
   * Constructs a new {@link FieldNode}. <i>Subclasses must not use this constructor</i>. Instead,
   * they must use the {@link #FieldNode(int, int, String, String, String, Object)} version.
   *
   * @param access the field's access flags (see {@link org.objectweb.asm.Opcodes}). This parameter
   *     also indicates if the field is synthetic and/or deprecated.
   * @param name the field's name.
   * @param descriptor the field's descriptor (see {@link org.objectweb.asm.Type}).
   * @param signature the field's signature.
   * @param value the field's initial value. This parameter, which may be {@literal null} if the
   *     field does not have an initial value, must be an {@link Integer}, a {@link Float}, a {@link
   *     Long}, a {@link Double} or a {@link String}.
   * @throws IllegalStateException If a subclass calls this constructor.
   */
  public FieldNode(
      final int access,
      final String name,
      final String descriptor,
      final String signature,
      final Object value) {
    this(/* latest api = */ Opcodes.ASM7, access, name, descriptor, signature, value);
    if (getClass() != FieldNode.class) {
      throw new IllegalStateException();
    }
  }

  
Constructs a new FieldNode. 
Params:
api – the ASM API version implemented by this visitor. Must be one of Opcodes.ASM4 or Opcodes.ASM5.
access – the field's access flags (see Opcodes). This parameter also indicates if the field is synthetic and/or deprecated.
name – the field's name.
descriptor – the field's descriptor (see Type).
signature – the field's signature.
value – the field's initial value. This parameter, which may be null if the field does not have an initial value, must be an Integer, a Float, a Long, a Double or a String./**
   * Constructs a new {@link FieldNode}.
   *
   * @param api the ASM API version implemented by this visitor. Must be one of {@link Opcodes#ASM4}
   *     or {@link Opcodes#ASM5}.
   * @param access the field's access flags (see {@link org.objectweb.asm.Opcodes}). This parameter
   *     also indicates if the field is synthetic and/or deprecated.
   * @param name the field's name.
   * @param descriptor the field's descriptor (see {@link org.objectweb.asm.Type}).
   * @param signature the field's signature.
   * @param value the field's initial value. This parameter, which may be {@literal null} if the
   *     field does not have an initial value, must be an {@link Integer}, a {@link Float}, a {@link
   *     Long}, a {@link Double} or a {@link String}.
   */
  public FieldNode(
      final int api,
      final int access,
      final String name,
      final String descriptor,
      final String signature,
      final Object value) {
    super(api);
    this.access = access;
    this.name = name;
    this.desc = descriptor;
    this.signature = signature;
    this.value = value;
  }

  // -----------------------------------------------------------------------------------------------
  // Implementation of the FieldVisitor abstract class
  // -----------------------------------------------------------------------------------------------

  @Override
  public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
    AnnotationNode annotation = new AnnotationNode(descriptor);
    if (visible) {
      visibleAnnotations = Util.add(visibleAnnotations, annotation);
    } else {
      invisibleAnnotations = Util.add(invisibleAnnotations, annotation);
    }
    return annotation;
  }

  @Override
  public AnnotationVisitor visitTypeAnnotation(
      final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
    TypeAnnotationNode typeAnnotation = new TypeAnnotationNode(typeRef, typePath, descriptor);
    if (visible) {
      visibleTypeAnnotations = Util.add(visibleTypeAnnotations, typeAnnotation);
    } else {
      invisibleTypeAnnotations = Util.add(invisibleTypeAnnotations, typeAnnotation);
    }
    return typeAnnotation;
  }

  @Override
  public void visitAttribute(final Attribute attribute) {
    attrs = Util.add(attrs, attribute);
  }

  @Override
  public void visitEnd() {
    // Nothing to do.
  }

  // -----------------------------------------------------------------------------------------------
  // Accept methods
  // -----------------------------------------------------------------------------------------------

  
Checks that this field node is compatible with the given ASM API version. This method checks
that this node, and all its children recursively, do not contain elements that were introduced
in more recent versions of the ASM API than the given version.
Params:
api – an ASM API version. Must be one of Opcodes.ASM4, Opcodes.ASM5, Opcodes.ASM6 or Opcodes.ASM7./**
   * Checks that this field node is compatible with the given ASM API version. This method checks
   * that this node, and all its children recursively, do not contain elements that were introduced
   * in more recent versions of the ASM API than the given version.
   *
   * @param api an ASM API version. Must be one of {@link Opcodes#ASM4}, {@link Opcodes#ASM5},
   *     {@link Opcodes#ASM6} or {@link Opcodes#ASM7}.
   */
  public void check(final int api) {
    if (api == Opcodes.ASM4) {
      if (visibleTypeAnnotations != null && !visibleTypeAnnotations.isEmpty()) {
        throw new UnsupportedClassVersionException();
      }
      if (invisibleTypeAnnotations != null && !invisibleTypeAnnotations.isEmpty()) {
        throw new UnsupportedClassVersionException();
      }
    }
  }

  
Makes the given class visitor visit this field.
Params:
classVisitor – a class visitor./**
   * Makes the given class visitor visit this field.
   *
   * @param classVisitor a class visitor.
   */
  public void accept(final ClassVisitor classVisitor) {
    FieldVisitor fieldVisitor = classVisitor.visitField(access, name, desc, signature, value);
    if (fieldVisitor == null) {
      return;
    }
    // Visit the annotations.
    if (visibleAnnotations != null) {
      for (int i = 0, n = visibleAnnotations.size(); i < n; ++i) {
        AnnotationNode annotation = visibleAnnotations.get(i);
        annotation.accept(fieldVisitor.visitAnnotation(annotation.desc, true));
      }
    }
    if (invisibleAnnotations != null) {
      for (int i = 0, n = invisibleAnnotations.size(); i < n; ++i) {
        AnnotationNode annotation = invisibleAnnotations.get(i);
        annotation.accept(fieldVisitor.visitAnnotation(annotation.desc, false));
      }
    }
    if (visibleTypeAnnotations != null) {
      for (int i = 0, n = visibleTypeAnnotations.size(); i < n; ++i) {
        TypeAnnotationNode typeAnnotation = visibleTypeAnnotations.get(i);
        typeAnnotation.accept(
            fieldVisitor.visitTypeAnnotation(
                typeAnnotation.typeRef, typeAnnotation.typePath, typeAnnotation.desc, true));
      }
    }
    if (invisibleTypeAnnotations != null) {
      for (int i = 0, n = invisibleTypeAnnotations.size(); i < n; ++i) {
        TypeAnnotationNode typeAnnotation = invisibleTypeAnnotations.get(i);
        typeAnnotation.accept(
            fieldVisitor.visitTypeAnnotation(
                typeAnnotation.typeRef, typeAnnotation.typePath, typeAnnotation.desc, false));
      }
    }
    // Visit the non standard attributes.
    if (attrs != null) {
      for (int i = 0, n = attrs.size(); i < n; ++i) {
        fieldVisitor.visitAttribute(attrs.get(i));
      }
    }
    fieldVisitor.visitEnd();
  }
}