VolumeSystem.java

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/*
 * Autopsy Forensic Browser
 * 
 * Copyright 2011 Basis Technology Corp.
 * Contact: carrier <at> sleuthkit <dot> org
 * 
 * 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.sleuthkit.datamodel;

import java.util.ArrayList;
import java.util.List;
import org.sleuthkit.datamodel.TskData.TSK_VS_TYPE_ENUM;

public class VolumeSystem extends AbstractContent {

        private volatile long volumeSystemHandle = 0;
        private long type, imgOffset, blockSize;

        protected VolumeSystem(SleuthkitCase db, long obj_id, String name, long type, long imgOffset, long blockSize) {
                super(db, obj_id, name);
                this.type = type;
                this.imgOffset = imgOffset;
                this.blockSize = blockSize;
        }

        @Override
        public int read(byte[] readBuffer, long offset, long len) throws TskCoreException {
                synchronized (this) {
                        if (volumeSystemHandle == 0) {
                                getVolumeSystemHandle();
                        }
                }
                return SleuthkitJNI.readVs(volumeSystemHandle, readBuffer, offset, len);
        }

        @Override
        public long getSize() {
                return 0;
        }

        public TSK_VS_TYPE_ENUM getType() {
                return TskData.TSK_VS_TYPE_ENUM.valueOf(type);
        }

        public long getOffset() {
                return imgOffset;
        }

        public long getBlockSize() {
                return blockSize;
        }

        protected synchronized long getVolumeSystemHandle() throws TskCoreException {
                if (volumeSystemHandle == 0) {
                        Content dataSource = getDataSource();
                        if ((dataSource != null) && (dataSource instanceof Image)) {
                                Image image = (Image) dataSource;
                                volumeSystemHandle = SleuthkitJNI.openVs(image.getImageHandle(), imgOffset);
                        } else {
                                throw new TskCoreException("Volume System data source is not an image");
                        }
                }

                return volumeSystemHandle;
        }

        @Override
        public void close() {
                if (volumeSystemHandle != 0) {
                        synchronized (this) {
                                if (volumeSystemHandle != 0) {
                                        SleuthkitJNI.closeVs(volumeSystemHandle);
                                        volumeSystemHandle = 0;
                                }
                        }
                }
        }

        @Override
        public void finalize() throws Throwable {
                try {
                        close();
                } finally {
                        super.finalize();
                }
        }

        @Override
        public <T> T accept(SleuthkitItemVisitor<T> v) {
                return v.visit(this);
        }

        @Override
        public <T> T accept(ContentVisitor<T> v) {
                return v.visit(this);
        }

        @Override
        public List<Content> getChildren() throws TskCoreException {
                return getSleuthkitCase().getVolumeSystemChildren(this);
        }

        @Override
        public List<Long> getChildrenIds() throws TskCoreException {
                return getSleuthkitCase().getVolumeSystemChildrenIds(this);
        }

        public List<Volume> getVolumes() throws TskCoreException {
                List<Volume> volumes = new ArrayList<Volume>();
                for (Content child : getChildren()) {
                        if (child instanceof Volume) {
                                volumes.add((Volume) child);
                        }
                }
                return volumes;
        }

        @Override
        public String toString(boolean preserveState) {
                return super.toString(preserveState) + "VolumeSystem [\t" + "blockSize " + blockSize + "\t" + "imgOffset " + imgOffset + "\t" + "type " + type + "]\t"; //NON-NLS
        }
}