Package javassist.bytecode

Class FieldInfo

  • public final class FieldInfo
extends java.lang.Object
    field_info structure.

    The following code adds a public field width of int type: 

     ClassFile cf = ...
 FieldInfo f = new FieldInfo(cf.getConstPool(), "width", "I");
 f.setAccessFlags(AccessFlag.PUBLIC);
 cf.addField(f);
    See Also:
    CtField.getFieldInfo()

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private FieldInfo​(ConstPool cp)  
      (package private) FieldInfo​(ConstPool cp, java.io.DataInputStream in)  
        FieldInfo​(ConstPool cp, java.lang.String fieldName, java.lang.String desc)
      Constructs a field_info structure.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void addAttribute​(AttributeInfo info)
      Appends an attribute.
      (package private) void compact​(ConstPool cp)
      Copies all constant pool items to a given new constant pool and replaces the original items with the new ones.
      int getAccessFlags()
      Returns the access flags.
      AttributeInfo getAttribute​(java.lang.String name)
      Returns the attribute with the specified name.
      java.util.List getAttributes()
      Returns all the attributes.
      int getConstantValue()
      Finds a ConstantValue attribute and returns the index into the constant_pool table.
      ConstPool getConstPool()
      Returns the constant pool table used by this field_info.
      java.lang.String getDescriptor()
      Returns the field descriptor.
      java.lang.String getName()
      Returns the field name.
      (package private) void prune​(ConstPool cp)  
      private void read​(java.io.DataInputStream in)  
      AttributeInfo removeAttribute​(java.lang.String name)
      Removes an attribute with the specified name.
      void setAccessFlags​(int acc)
      Sets the access flags.
      void setDescriptor​(java.lang.String desc)
      Sets the field descriptor.
      void setName​(java.lang.String newName)
      Sets the field name.
      java.lang.String toString()
      Returns a string representation of the object.
      (package private) void write​(java.io.DataOutputStream out)  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Field Detail

      • accessFlags

        int accessFlags

      • name

        int name

      • cachedName

        java.lang.String cachedName

      • cachedType

        java.lang.String cachedType

      • descriptor

        int descriptor

      • attribute

        java.util.ArrayList attribute

    • Constructor Detail

      • FieldInfo

        private FieldInfo​(ConstPool cp)

      • FieldInfo

        public FieldInfo​(ConstPool cp,
                 java.lang.String fieldName,
                 java.lang.String desc)
        Constructs a field_info structure.
        Parameters:
        cp - a constant pool table
        fieldName - field name
        desc - field descriptor
        See Also:
        Descriptor

      • FieldInfo

        FieldInfo​(ConstPool cp,
          java.io.DataInputStream in)
   throws java.io.IOException
        Throws:
        java.io.IOException

    • Method Detail

      • toString

        public java.lang.String toString()
        Returns a string representation of the object.
        Overrides:
        toString in class java.lang.Object

      • compact

        void compact​(ConstPool cp)
        Copies all constant pool items to a given new constant pool and replaces the original items with the new ones. This is used for garbage collecting the items of removed fields and methods.
        Parameters:
        cp - the destination

      • getConstPool

        public ConstPool getConstPool()
        Returns the constant pool table used by this field_info.

      • getName

        public java.lang.String getName()
        Returns the field name.

      • setName

        public void setName​(java.lang.String newName)
        Sets the field name.

      • getAccessFlags

        public int getAccessFlags()
        Returns the access flags.
        See Also:
        AccessFlag

      • setAccessFlags

        public void setAccessFlags​(int acc)
        Sets the access flags.
        See Also:
        AccessFlag

      • getDescriptor

        public java.lang.String getDescriptor()
        Returns the field descriptor.
        See Also:
        Descriptor

      • setDescriptor

        public void setDescriptor​(java.lang.String desc)
        Sets the field descriptor.
        See Also:
        Descriptor

      • getConstantValue

        public int getConstantValue()
        Finds a ConstantValue attribute and returns the index into the constant_pool table.
        Returns:
        0 if a ConstantValue attribute is not found.

      • getAttributes

        public java.util.List getAttributes()
        Returns all the attributes. The returned List object is shared with this object. If you add a new attribute to the list, the attribute is also added to the field represented by this object. If you remove an attribute from the list, it is also removed from the field.
        Returns:
        a list of AttributeInfo objects.
        See Also:
        AttributeInfo

      • removeAttribute

        public AttributeInfo removeAttribute​(java.lang.String name)
        Removes an attribute with the specified name.
        Parameters:
        name - attribute name.
        Returns:
        the removed attribute or null.
        Since:
        3.21

      • addAttribute

        public void addAttribute​(AttributeInfo info)
        Appends an attribute. If there is already an attribute with the same name, the new one substitutes for it.
        See Also:
        getAttributes()

      • read

        private void read​(java.io.DataInputStream in)
           throws java.io.IOException
        Throws:
        java.io.IOException

      • write

        void write​(java.io.DataOutputStream out)
    throws java.io.IOException
        Throws:
        java.io.IOException