org.cryptoworkshop.ximix.common.asn1.message.TranscriptBlock.java Source code

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Here is the source code for org.cryptoworkshop.ximix.common.asn1.message.TranscriptBlock.java

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/**
 * Copyright 2013 Crypto Workshop Pty Ltd
 *
 * 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 org.cryptoworkshop.ximix.common.asn1.message;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DLSequence;

/**
 * Carrier class for a block of transcript messages associated with a given step.
 */
public class TranscriptBlock extends ASN1Object {
    private int stepNo;
    private ASN1Sequence details;

    /**
     * Builder for a TranscriptBlock
     */
    public static class Builder {
        private final int stepNo;
        private final int capacity;

        private ASN1EncodableVector details;

        /**
         * Base constructor.
         *
         * @param stepNo the step number this transcript block is associated with.
         * @param capacity the maximum number of messages that can held in any block built.
         */
        public Builder(int stepNo, int capacity) {
            this.stepNo = stepNo;
            this.capacity = capacity;
            this.details = new ASN1EncodableVector();
        }

        public Builder add(ASN1Encodable detail) {
            details.add(detail);

            return this;
        }

        public Builder clear() {
            details = new ASN1EncodableVector();

            return this;
        }

        public TranscriptBlock build() {
            return new TranscriptBlock(stepNo, details);
        }

        public int capacity() {
            return capacity;
        }

        public boolean isFull() {
            return details.size() == capacity;
        }

        public boolean isEmpty() {
            return details.size() == 0;
        }
    }

    private TranscriptBlock(int stepNo, ASN1EncodableVector details) {
        this.stepNo = stepNo;
        this.details = new DLSequence(details);
    }

    private TranscriptBlock(ASN1Sequence seq) {
        this.stepNo = ASN1Integer.getInstance(seq.getObjectAt(0)).getValue().intValue();
        this.details = ASN1Sequence.getInstance(seq.getObjectAt(1));
    }

    public static final TranscriptBlock getInstance(Object o) {
        if (o instanceof TranscriptBlock) {
            return (TranscriptBlock) o;
        } else if (o != null) {
            return new TranscriptBlock(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    @Override
    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(new ASN1Integer(stepNo));
        v.add(details);

        return new DERSequence(v);
    }

    public int getStepNo() {
        return stepNo;
    }

    public ASN1Sequence getDetails() {
        return details;
    }

    public int size() {
        return details.size();
    }
}