/**************************************************************************************
 * Copyright (c) Jonas Bonér, 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.reflect;

/**
 * Holds a tuple that consists of the class info and the info for a specific method.
 * 
 * @author <a href="mailto:jboner@codehaus.org">Jonas Bonér </a>
 * @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur </a>
 */
public class CflowMetaData {
    /**
     * The class name.
     */
    private final String m_className;

    /**
     * The class info.
     */
    private ClassInfo m_classMetaData;

    /**
     * The method info.
     */
    private final MethodInfo m_methodMetaData;

    /**
     * Creates a new ClassNameMethodInfoTuple.
     * 
     * @param classMetaData the class metaData
     * @param methodMetaData the method info
     */
    public CflowMetaData(final ClassInfo classMetaData, final MethodInfo methodMetaData) {
        m_className = classMetaData.getName();
        m_classMetaData = classMetaData;
        m_methodMetaData = methodMetaData;
    }

    /**
     * Returns the class info.
     * 
     * @return the class info
     */
    public ClassInfo getClassInfo() {
        return m_classMetaData;
    }

    /**
     * Returns the class name.
     * 
     * @return the class name
     */
    public String getClassName() {
        return m_className;
    }

    /**
     * Returns the method info.
     * 
     * @return the method info
     */
    public MethodInfo getMethodInfo() {
        return m_methodMetaData;
    }

    // --- over-ridden methods ---
    public String toString() {
        return '[' + super.toString() + ": " + ',' + m_className + ',' + m_classMetaData + ',' + m_methodMetaData + ']';
    }

    public int hashCode() {
        int result = 17;
        result = (37 * result) + hashCodeOrZeroIfNull(m_className);
        result = (37 * result) + hashCodeOrZeroIfNull(m_classMetaData);
        result = (37 * result) + hashCodeOrZeroIfNull(m_methodMetaData);
        return result;
    }

    protected static int hashCodeOrZeroIfNull(final Object o) {
        if (null == o) {
            return 19;
        }
        return o.hashCode();
    }

    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof CflowMetaData)) {
            return false;
        }
        final CflowMetaData obj = (CflowMetaData) o;
        return areEqualsOrBothNull(obj.m_className, this.m_className)
            && areEqualsOrBothNull(obj.m_classMetaData, this.m_classMetaData)
            && areEqualsOrBothNull(obj.m_methodMetaData, this.m_methodMetaData);
    }

    protected static boolean areEqualsOrBothNull(final Object o1, final Object o2) {
        if (null == o1) {
            return (null == o2);
        }
        return o1.equals(o2);
    }
}