/**************************************************************************************
 * Copyright (c) Jonas BonŽr, Alexandre Vasseur. All rights reserved.                 *
 * http://aspectwerkz.codehaus.org                                                    *
 * ---------------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the LGPL license      *
 * a copy of which has been included with this distribution in the license.txt file.  *
 **************************************************************************************/
package org.codehaus.aspectwerkz.joinpoint.impl;

import org.codehaus.aspectwerkz.joinpoint.FieldRtti;
import org.codehaus.aspectwerkz.joinpoint.Rtti;

import java.lang.ref.WeakReference;
import java.lang.reflect.Field;

/**
 * Implementation for the field signature.
 *
 * @author <a href="mailto:jboner@codehaus.org">Jonas BonŽr </a>
 */
public class FieldRttiImpl implements FieldRtti {
    private final FieldSignatureImpl m_signature;

    private WeakReference m_thisRef;

    private WeakReference m_targetRef;

    private Object m_fieldValue;

    /**
     * Creates a new field RTTI.
     *
     * @param signature
     * @param thisInstance
     * @param targetInstance
     */
    public FieldRttiImpl(final FieldSignatureImpl signature, final Object thisInstance, final Object targetInstance) {
        m_signature = signature;
        m_thisRef = new WeakReference(thisInstance);
        m_targetRef = new WeakReference(targetInstance);
    }

    /**
     * Clones the RTTI instance.
     *
     * @param thisInstance
     * @param targetInstance
     * @return
     */
    public Rtti cloneFor(final Object thisInstance, final Object targetInstance) {
        return new FieldRttiImpl(m_signature, thisInstance, targetInstance);
    }

    /**
     * Returns the target instance.
     *
     * @return the target instance
     */
    public Object getTarget() {
        return m_targetRef.get();
    }

    /**
     * Returns the instance currently executing.
     *
     * @return the instance currently executing
     */
    public Object getThis() {
        return m_thisRef.get();
    }

    /**
     * Returns the declaring class.
     *
     * @return the declaring class
     */
    public Class getDeclaringType() {
        return m_signature.getDeclaringType();
    }

    /**
     * Returns the modifiers for the signature. <p/>Could be used like this:
     * <p/>
     * <pre>
     * boolean isPublic = java.lang.reflect.Modifier.isPublic(signature.getModifiers());
     * </pre>
     *
     * @return the mofifiers
     */
    public int getModifiers() {
        return m_signature.getModifiers();
    }

    /**
     * Returns the name (f.e. name of method of field).
     *
     * @return the name
     */
    public String getName() {
        return m_signature.getName();
    }

    /**
     * Returns the field.
     *
     * @return the field
     */
    public Field getField() {
        return m_signature.getField();
    }

    /**
     * Returns the field type.
     *
     * @return the field type
     */
    public Class getFieldType() {
        return m_signature.getFieldType();
    }

    /**
     * Returns the value of the field.
     *
     * @return the value of the field
     */
    public Object getFieldValue() {
        return m_fieldValue;
    }

    /**
     * Sets the value of the field.
     *
     * @param fieldValue the value of the field
     */
    public void setFieldValue(final Object fieldValue) {
        m_fieldValue = fieldValue;
    }

    /**
     * Returns a string representation of the signature.
     *
     * @return a string representation
     * @TODO: implement toString to something meaningful
     */
    public String toString() {
        return super.toString();
    }

    /**
     * TODO: Needed for stupid JIT compiler. Remove for 2.0.
     *
     * @return
     */
    public Object[] getParameterValues() {
        return new Object[]{m_fieldValue};
    }
}