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JDBC Driver for the Firebird RDBMS
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/*
 * Public Firebird Java API.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    1. Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *    3. The name of the author may not be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.firebirdsql.gds;

import org.firebirdsql.encodings.Encoding;
import org.firebirdsql.gds.impl.wire.Xdrable;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;

/**
 * Instance of this interface represents a Parameter Buffer it is extended
 * by various parameter buffer interfaces.
 *
 * @author Mark Rotteveel
 * @see org.firebirdsql.gds.ParameterBuffer
 * @see org.firebirdsql.gds.ServiceRequestBuffer
 * @see org.firebirdsql.gds.TransactionParameterBuffer
 * @see org.firebirdsql.gds.ServiceParameterBuffer
 * @since 3.0
 */
public interface ParameterBuffer extends Iterable {

    /**
     * @return The parameter buffer type identifier
     */
    int getType();

    /**
     * Add argument with no parameters.
     *
     * @param argumentType
     *         type of argument.
     */
    void addArgument(int argumentType);

    /**
     * Add string argument with the default encoding.
     *
     * @param argumentType
     *         type of argument.
     * @param value
     *         string value to add.
     */
    void addArgument(int argumentType, String value);

    /**
     * Add string argument.
     *
     * @param argumentType
     *         type of argument.
     * @param value
     *         string value to add.
     * @param encoding
     *         encoding to use for conversion to bytes
     */
    void addArgument(int argumentType, String value, Encoding encoding);

    /**
     * Add integer argument.
     *
     * @param argumentType
     *         type of argument.
     * @param value
     *         integer value to add.
     */
    void addArgument(int argumentType, int value);

    /**
     * Add long argument.
     *
     * @param argumentType
     *         type of argument.
     * @param value
     *         long value to add.
     */
    void addArgument(int argumentType, long value);

    /**
     * Add array of bytes.
     *
     * @param argumentType
     *         type of argument.
     * @param content
     *         content of argument.
     */
    void addArgument(int argumentType, byte[] content);

    /**
     * Remove specified argument.
     *
     * @param argumentType
     *         type of argument to remove.
     */
    void removeArgument(int argumentType);

    /**
     * Get argument as string.
     *
     * @param argumentType
     *         type of argument to find.
     * @return argument as string or null if nothing found.
     */
    String getArgumentAsString(int argumentType);

    /**
     * Get argument as int.
     *
     * @param argumentType
     *         type of argument to find.
     * @return argument as string or 0 if nothing found.
     */
    int getArgumentAsInt(int argumentType);

    /**
     * Check if this parameter buffer has specified argument.
     *
     * @param argumentType
     *         type of argument to find.
     * @return true if this buffer contains specified argument.
     */
    boolean hasArgument(int argumentType);

    /**
     * Returns an iterator over a copy of the parameters in this parameter buffer.
     * 
     * It is safe to iterate over this iterator while modifying the parameter buffer. Changes will not be reflected in
     * the iterator.
     * 
     *
     * @return Iterator over the parameters in this parameter buffer.
     */
    @Override
    Iterator iterator();

    /**
     * Writes the arguments in the implementation specific serialization into the {@code OutputStream}.
     *
     * @param outputStream
     *         The {@code OutputStream} to write to
     * @throws IOException
     *         Errors produced by the output stream during writes
     */
    void writeArgumentsTo(OutputStream outputStream) throws IOException;

    /**
     * @return {@code Xdrable} to write (and optionally read) this instance as Xdr.
     */
    Xdrable toXdrable();

    /**
     * Converts this parameter buffer to a byte array.
     * 
     * This byte array includes the extra header-bytes (if any), but does not include the type information
     * 
     *
     * @return Byte array with serialization of this parameter buffer
     * @see #toBytesWithType()
     */
    byte[] toBytes();

    /**
     * Converts this parameter buffer to a byte array with type information.
     * 
     * This byte array includes the type information and the extra header bytes (if any).
     * 
     *
     * @return Byte array with serialization of this parameter buffer
     * @see #toBytes()
     */
    byte[] toBytesWithType();

    /**
     * @return the number of parameters stored.
     */
    int size();
}