Android Open Source - bad Var Expression

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License

The source code is released under:

Copyright (C) 2013 Madis Pink Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Softwa...

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Java Source Code

package com.madisp.bad.expr;
/*from  w  ww  .  j a  va2 s  .c o m*/
import com.madisp.bad.eval.BadVar;
import com.madisp.bad.eval.Scope;
import com.madisp.bad.eval.Watcher;

/**
 * Created with IntelliJ IDEA.
 * User: madis
 * Date: 3/23/13
 * Time: 1:57 PM
 */
public class VarExpression extends BasableExpression {
  String var;
  public VarExpression(BasableExpression base, String var) {
    super(base);
    this.var = var;
  }

  @Override
  public Object value(Scope scope) {
    if (var == null) {
      return null;
    }
    if (!hasBase()) {
      return scope.getVar(null, var);
    }
    Object base = getBase(scope);
    if (base != null) {
      return scope.getVar(base, var);
    }
    return null;
  }

  public String getIdentifier() {
    return var;
  }

  @SuppressWarnings("unchecked")
  @Override
  public void addWatcher(final Scope scope, final Watcher w) {
    super.addWatcher(scope, w);
    Object o = value(scope);
    final BadVar.BadWatcher watcher = new BadVar.BadWatcher() {
      @Override
      public void fire(BadVar var) {
        w.fire(scope);
      }
    };
    if (o instanceof BadVar) {
      ((BadVar)o).addWatcher(watcher);
    }
    scope.addOnRebasedListener(new Scope.OnScopeRebasedListener() {
      @Override
      public void onScopeDetached(Scope scope) {
        Object o = value(scope);
        if (o instanceof BadVar) {
          ((BadVar)o).removeWatcher(watcher);
        }
      }
      @Override
      public void onScopeAttached(Scope scope) {
        Object o = value(scope);
        if (o instanceof BadVar) {
          ((BadVar)o).addWatcher(watcher);
        }
        w.fire(scope);
      }
    });
  }
}

Java Source Code List