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/**
 * Copyright 2011 Google Inc.
 *
 * Licensed 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.
 */

package com.google.bitcoin.core;

import com.google.bitcoin.script.Script;
import com.google.bitcoin.script.ScriptBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nullable;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.lang.ref.WeakReference;
import java.math.BigInteger;

import static com.google.common.base.Preconditions.*;

/**
 * A TransactionOutput message contains a scriptPubKey that controls who is able to spend its value. It is a sub-part
 * of the Transaction message.
 */
public class TransactionOutput extends ChildMessage implements Serializable {
    private static final Logger log = LoggerFactory.getLogger(TransactionOutput.class);
    private static final long serialVersionUID = -590332479859256824L;

    // A transaction output has some value and a script used for authenticating that the redeemer is allowed to spend
    // this output.
    private BigInteger value;
    private byte[] scriptBytes;

    // The script bytes are parsed and turned into a Script on demand.
    private transient WeakReference