package org.apache.commons.digester3;

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.lang.reflect.Method;

/**
 * Detached representation of a method invocation.
 * From Commons [proxy] v2 branch.
 * @author James Carman
 */
final class RecordedInvocation
{

    //**********************************************************************************************************************
    // Fields
    //**********************************************************************************************************************

    private final Method invokedMethod;

    private final Object[] arguments;

    //**********************************************************************************************************************
    // Constructors
    //**********************************************************************************************************************

    /**
     * Create a new RecordedInvocation instance.
     *
     * @param invokedMethod
     * @param arguments
     */
    public RecordedInvocation( Method invokedMethod, Object[] arguments )
    {
        this.invokedMethod = invokedMethod;
        this.arguments = arguments;
    }

    //**********************************************************************************************************************
    // Canonical Methods
    //**********************************************************************************************************************

    /**
     * Get the invokedMethod.
     *
     * @return Method
     */
    public Method getInvokedMethod()
    {
        return invokedMethod;
    }

    /**
     * Get the arguments.
     *
     * @return Object[]
     */
    public Object[] getArguments()
    {
        return arguments;
    }

    /**
     * {@inheritDoc}
     */
    public String toString()
    {
        StringBuilder buffer = new StringBuilder();
        buffer.append( invokedMethod.getDeclaringClass().getName() );
        buffer.append( "." );
        buffer.append( invokedMethod.getName() );
        buffer.append( "(" );
        int count = arguments.length;
        for ( int i = 0; i < count; i++ )
        {
            Object arg = arguments[i];
            if ( i > 0 )
            {
                buffer.append( ", " );
            }
            convert( buffer, arg );
        }
        buffer.append( ")" );
        return buffer.toString();
    }

    /**
     * Add a string representation of <code>input</code> to <code>buffer</code>.
     *
     * @param buffer the buffer to append the string representation of the input object.
     * @param input the input object has to be serialized to string.
     */
    protected void convert( StringBuilder buffer, Object input )
    {
        if ( input == null )
        {
            buffer.append( "<null>" );
            return;
        }

        // Primitive types, and non-object arrays
        // use toString().
        if ( !( input instanceof Object[] ) )
        {
            buffer.append( input.toString() );
            return;
        }
        else
        {
            buffer.append( "(" );
            buffer.append( input.getClass().getSimpleName() );
            buffer.append( "){" );
            Object[] array = (Object[]) input;
            int count = array.length;
            for ( int i = 0; i < count; i++ )
            {
                if ( i > 0 )
                {
                    buffer.append( ", " );
                }
                // We use convert() again, because it could be a multi-dimensional array
                // where each element must be converted.
                convert( buffer, array[i] );
            }
            buffer.append( "}" );
        }
    }

}