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package com.sun.jdo.api.persistence.enhancer.classfile;

import java.util.Hashtable;

/**
 * Environment in which to decode the attributes of a CodeAttribute.
 */

class CodeEnv {
  /* The constant pool */
  private ConstantPool constantPool;

  /* hash table mapping byte code offset to InsnTarget */
  private Hashtable targets = new Hashtable(7);

  CodeEnv(ConstantPool constantPool) {
    this.constantPool = constantPool;
  }

  final InsnTarget getTarget(int offset) {
    Integer off = new Integer(offset);
    InsnTarget targ = (InsnTarget)targets.get(off);
    if (targ == null) {
      targ = new InsnTarget(offset);
      targets.put(off, targ);
    }
    return targ;
  }

  final InsnTarget findTarget(int offset) {
    Integer off = new Integer(offset);
    return (InsnTarget)targets.get(off);
  }

  final ConstantPool pool() {
    return constantPool;
  }

}