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The Waikato Environment for Knowledge Analysis (WEKA), a machine
learning workbench. This version represents the developer version, the
"bleeding edge" of development, you could say. New functionality gets added
to this version.
/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see variables = new HashMap();
/** the initializer to initialize the variables with values */
private VariableInitializer initializer = new VariableInitializer();
/**
* Whether the variable is declared
*
* @param name name of the variable being queried
* @return whether the variable is declared
*/
@Override
public boolean hasVariable(String name) {
return variables.containsKey(name);
}
/**
* Tries to fetch a declared variable
*
* @param name name of the variable to be fetched
* @return an AST (abstrac syntax tree) node representing the variable
*/
@Override
public Node getVariable(String name) {
if (!variables.containsKey(name))
throw new RuntimeException("Variable '" + name + "' doesn't exist!");
initializer.add(variables.get(name));
return variables.get(name);
}
/**
* Adds a variable declaration for a boolean variable
*
* Requires that the variable hasn't been declared before.
*
* @param name the name of the variable
*/
public void addBoolean(String name) {
if (variables.containsKey(name))
throw new RuntimeException("Variable '" + name + "' already exists!");
variables.put(name, new BooleanVariable(name));
}
/**
* Adds a variable declaration for a double variable
*
* Requires that the variable hasn't been declared before.
*
* @param name the name of the variable
*/
public void addDouble(String name) {
if (variables.containsKey(name))
throw new RuntimeException("Variable '" + name + "' already exists!");
variables.put(name, new DoubleVariable(name));
}
/**
* Adds a variable declaration for a string variable
*
* Requires that the variable hasn't been declared before.
*
* @param name the name of the variable
*/
public void addString(String name) {
if (variables.containsKey(name))
throw new RuntimeException("Variable '" + name + "' already exists!");
variables.put(name, new StringVariable(name));
}
/**
* Returns an object to initialize the declared variables
*
* @return an object to initialize the declared variables
*/
public VariableInitializer getInitializer() {
return initializer;
}
/**
* A class to initialize variables that have been declared by a
* {@link SimpleVariableDeclarations} class and used inside a program
*
* Note that not all variables declared can be initialized!
* Particularly variables that have been declared but are never used inside a
* program can't be initialized.
*
* Then variable values that are expensive to compute don't have to be computed
* if the values are never used inside a program.
*
* @author Benjamin Weber ( benweber at student dot ethz dot ch )
* @version $Revision: 1000 $
*/
public static class VariableInitializer implements Serializable {
/** The variables that have been declared and used in a program */
private Map variables = new HashMap();
/**
* Adds a variable so that it can be initialized.
*
* Requires that the var parameter is one of
*
* - {@link Primitives.BooleanVariable}
* - {@link Primitives.DoubleVariable}
* - {@link Primitives.StringVariable}
*
*
* @param var an AST node representing the variable
*/
private void add(Node var) {
assert var instanceof BooleanVariable || var instanceof DoubleVariable ||
var instanceof StringVariable;
if (var instanceof BooleanVariable)
variables.put(((BooleanVariable) var).getName(), var);
else if (var instanceof DoubleVariable)
variables.put(((DoubleVariable) var).getName(), var);
else if (var instanceof StringVariable)
variables.put(((StringVariable) var).getName(), var);
}
/**
* Returns the set of variable names that can be initialized
*
* @return the set of variable names that can be initialized
*/
public Set getVariables() {
return variables.keySet();
}
/**
* Returns whether the {@link VariableInitializer} contains the variable
*
* @param variable name of the variable
* @return whether the variable exists
*/
public boolean hasVariable(String variable) {
return variables.containsKey(variable);
}
/**
* Sets the value of a boolean variable
*
* Requires that the variable exists and is of boolean type.
*
* @param name name of the boolean variable
* @param value the value the boolean variable will be set to
*/
public void setBoolean(String name, boolean value) {
if (!variables.containsKey(name))
throw new RuntimeException("Variable '" + name + "' doesn't exist!");
if (!(variables.get(name) instanceof BooleanVariable))
throw new RuntimeException("Variable '" + name + "' is not of boolean type!");
((BooleanVariable) variables.get(name)).setValue(value);
}
/**
* Sets the value of a double variable
*
* Requires that the variable exists and is of double type.
*
* @param name the name of the double variable
* @param value the value the double variable will be set to
*/
public void setDouble(String name, double value) {
if (!variables.containsKey(name))
throw new RuntimeException("Variable '" + name + "' doesn't exist!");
if (!(variables.get(name) instanceof DoubleVariable))
throw new RuntimeException("Variable '" + name + "' is not of double type!");
((DoubleVariable) variables.get(name)).setValue(value);
}
/**
* Sets the value of a string variable
*
* Requires that the variable exists and is of string type.
*
* @param name the name of the string variable
* @param value the value the string variable will be set to
*/
public void setString(String name, String value) {
if (!variables.containsKey(name))
throw new RuntimeException("Variable '" + name + "' doesn't exist!");
if (!(variables.get(name) instanceof StringVariable))
throw new RuntimeException("Variable '" + name + "' is not of String type!");
((StringVariable) variables.get(name)).setValue(value);
}
}
}
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