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package com.sun.jdi;


A local variable in the target VM. Each variable declared within a Method has its own LocalVariable object. Variables of the same name declared in different scopes have different LocalVariable objects. LocalVariables can be used alone to retrieve static information about their declaration, or can be used in conjunction with a StackFrame to set and get values. 
Author:Robert Field, Gordon Hirsch, James McIlree
See Also:
Since: 1.3
/**
 * A local variable in the target VM. Each variable declared within a
 * {@link Method} has its own LocalVariable object. Variables of the same
 * name declared in different scopes have different LocalVariable objects.
 * LocalVariables can be used alone to retrieve static information
 * about their declaration, or can be used in conjunction with a
 * {@link StackFrame} to set and get values.
 *
 * @see StackFrame
 * @see Method
 *
 * @author Robert Field
 * @author Gordon Hirsch
 * @author James McIlree
 * @since  1.3
 */

@jdk.Exported
public interface LocalVariable extends Mirror, Comparable<LocalVariable> {

    
Gets the name of the local variable.

Returns:a string containing the name.
/**
     * Gets the name of the local variable.
     *
     * @return a string containing the name.
     */
    String name();

    
Returns a text representation of the type
of this variable.
Where the type is the type specified in the declaration
of this local variable.


This type name is always available even if
the type has not yet been created or loaded.

Returns:a String representing the
type of this local variable.
/**
     * Returns a text representation of the type
     * of this variable.
     * Where the type is the type specified in the declaration
     * of this local variable.
     * <P>
     * This type name is always available even if
     * the type has not yet been created or loaded.
     *
     * @return a String representing the
     * type of this local variable.

     */
    String typeName();

    
Returns the type of this variable.
Where the type is the type specified in the declaration
of this local variable.

 Note: if the type of this variable is a reference type (class, interface, or array) and it has not been created or loaded by the class loader of the enclosing class, then ClassNotLoadedException will be thrown. Also, a reference type may have been loaded but not yet prepared, in which case the type will be returned but attempts to perform some operations on the returned type (e.g. fields()) will throw a ClassNotPreparedException. Use ReferenceType.isPrepared() to determine if a reference type is prepared. 
Throws:
See Also:
Returns:the Type of this local variable.
/**
     * Returns the type of this variable.
     * Where the type is the type specified in the declaration
     * of this local variable.
     * <P>
     * Note: if the type of this variable is a reference type (class,
     * interface, or array) and it has not been created or loaded
     * by the class loader of the enclosing class,
     * then ClassNotLoadedException will be thrown.
     * Also, a reference type may have been loaded but not yet prepared,
     * in which case the type will be returned
     * but attempts to perform some operations on the returned type
     * (e.g. {@link ReferenceType#fields() fields()}) will throw
     * a {@link ClassNotPreparedException}.
     * Use {@link ReferenceType#isPrepared()} to determine if
     * a reference type is prepared.
     *
     * @see Type
     * @see Field#type() Field.type() - for usage examples
     * @return the {@link Type} of this local variable.
     * @throws ClassNotLoadedException if the type has not yet been loaded
     * through the appropriate class loader.
     */
    Type type() throws ClassNotLoadedException;

    
Gets the JNI signature of the local variable.

See Also:
Returns:a string containing the signature.
/**
     * Gets the JNI signature of the local variable.
     *
     * @see <a href="doc-files/signature.html">Type Signatures</a>
     * @return a string containing the signature.
     */
    String signature();

    
Gets the generic signature for this variable if there is one.
Generic signatures are described in the
The Java™ Virtual Machine Specification.

Returns:a string containing the generic signature, or null
if there is no generic signature.
Since:1.5
/**
     * Gets the generic signature for this variable if there is one.
     * Generic signatures are described in the
     * <cite>The Java&trade; Virtual Machine Specification</cite>.
     *
     * @return a string containing the generic signature, or <code>null</code>
     * if there is no generic signature.
     *
     * @since 1.5
     */
    String genericSignature();

    
Determines whether this variable can be accessed from the given StackFrame. See StackFrame.visibleVariables for a complete description variable visibility in this interface. 
Params:
  • frame – the StackFrame querying visibility
Throws:
Returns:true if this variable is visible;
false otherwise.
/**
     * Determines whether this variable can be accessed from the given
     * {@link StackFrame}.
     *
     * See {@link StackFrame#visibleVariables} for a complete description
     * variable visibility in this interface.
     *
     * @param frame the StackFrame querying visibility
     * @return <code>true</code> if this variable is visible;
     * <code>false</code> otherwise.
     * @throws IllegalArgumentException if the stack frame's method
     * does not match this variable's method.
     */
    boolean isVisible(StackFrame frame);

    
Determines if this variable is an argument to its method.

Returns:true if this variable is an argument;
false otherwise.
/**
     * Determines if this variable is an argument to its method.
     *
     * @return <code>true</code> if this variable is an argument;
     * <code>false</code> otherwise.
     */
    boolean isArgument();

    
Compares the specified Object with this LocalVariable for equality.

Returns: true if the Object is a LocalVariable, if both LocalVariables are contained in the same method (as determined by Method.equals), and if both LocalVariables mirror the same declaration within that method
/**
     * Compares the specified Object with this LocalVariable for equality.
     *
     * @return  true if the Object is a LocalVariable, if both LocalVariables
     * are contained in the same method (as determined by
     * {@link Method#equals}), and if both LocalVariables mirror
     * the same declaration within that method
     */
    boolean equals(Object obj);

    
Returns the hash code value for this LocalVariable.

Returns:the integer hash code
/**
     * Returns the hash code value for this LocalVariable.
     *
     * @return the integer hash code
     */
    int hashCode();
}