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/**
* Copyright (c) 2011, University of Konstanz, Distributed Systems Group All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met: * Redistributions of source code must retain the
* above copyright notice, this list of conditions and the following disclaimer. * 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.
* * Neither the name of the University of Konstanz nor the names of its contributors may be used to
* endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 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.sirix.page;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Nonnull;
import org.sirix.api.PageReadOnlyTrx;
import org.sirix.page.interfaces.Page;
/**
* All Page types.
*/
public enum PageKind {
/**
* {@link UnorderedKeyValuePage}.
*/
RECORDPAGE((byte) 1, UnorderedKeyValuePage.class) {
@Override
@Nonnull
Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx, final SerializationType type)
throws IOException {
return new UnorderedKeyValuePage(source, pageReadTrx);
}
@Override
void serializePage(final DataOutput sink, final Page page, final SerializationType type) throws IOException {
sink.writeByte(RECORDPAGE.mId);
page.serialize(sink, type);
}
@Override
public @Nonnull Page getInstance(final Page nodePage, final PageReadOnlyTrx pageReadTrx) {
assert nodePage instanceof UnorderedKeyValuePage;
final UnorderedKeyValuePage page = (UnorderedKeyValuePage) nodePage;
return new UnorderedKeyValuePage(page.getPageKey(), page.getPageKind(), page.getPreviousReferenceKey(),
pageReadTrx);
}
},
/**
* {@link NamePage}.
*/
NAMEPAGE((byte) 2, NamePage.class) {
@Override
@Nonnull
Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx, final SerializationType type)
throws IOException {
return new NamePage(source, type);
}
@Override
void serializePage(final DataOutput sink, final Page page, final SerializationType type) throws IOException {
sink.writeByte(NAMEPAGE.mId);
page.serialize(sink, type);
}
@Override
public @Nonnull Page getInstance(final Page page, final PageReadOnlyTrx pageReadTrx) {
return new NamePage();
}
},
/**
* {@link UberPage}.
*/
UBERPAGE((byte) 3, UberPage.class) {
@Override
@Nonnull
Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx, final SerializationType type)
throws IOException {
return new UberPage(source, type);
}
@Override
void serializePage(final DataOutput sink, final Page page, final SerializationType type) throws IOException {
sink.writeByte(UBERPAGE.mId);
page.serialize(sink, type);
}
@Override
public @Nonnull Page getInstance(final Page page, final PageReadOnlyTrx pageReadTrx) {
return new UberPage();
}
},
/**
* {@link IndirectPage}.
*/
INDIRECTPAGE((byte) 4, IndirectPage.class) {
@Override
@Nonnull
Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx, final SerializationType type)
throws IOException {
return new IndirectPage(source, type);
}
@Override
void serializePage(final DataOutput sink, final Page page, final SerializationType type) throws IOException {
sink.writeByte(INDIRECTPAGE.mId);
page.serialize(sink, type);
}
@Override
public @Nonnull Page getInstance(final Page page, final PageReadOnlyTrx pageReadTrx) {
return new IndirectPage();
}
},
/**
* {@link RevisionRootPage}.
*/
REVISIONROOTPAGE((byte) 5, RevisionRootPage.class) {
@Override
@Nonnull
Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx, final SerializationType type)
throws IOException {
return new RevisionRootPage(source, type);
}
@Override
void serializePage(final DataOutput sink, final Page page, final SerializationType type) throws IOException {
sink.writeByte(REVISIONROOTPAGE.mId);
page.serialize(sink, type);
}
@Override
public @Nonnull Page getInstance(final Page page, final PageReadOnlyTrx pageReadTrx) {
return new RevisionRootPage();
}
},
/**
* {@link PathSummaryPage}.
*/
PATHSUMMARYPAGE((byte) 6, PathSummaryPage.class) {
@Override
@Nonnull
Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx,
final @Nonnull SerializationType type) throws IOException {
return new PathSummaryPage(source, type);
}
@Override
void serializePage(final DataOutput sink, final Page page, final @Nonnull SerializationType type)
throws IOException {
sink.writeByte(PATHSUMMARYPAGE.mId);
page.serialize(sink, type);
}
@Override
public @Nonnull Page getInstance(final Page page, final PageReadOnlyTrx pageReadTrx) {
return new PathSummaryPage();
}
},
/**
* {@link TextValuePage}.
*/
TEXTVALUEPAGE((byte) 7, PathPage.class) {
@Override
@Nonnull
Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx,
final @Nonnull SerializationType type) throws IOException {
return new PathPage(source, type);
}
@Override
void serializePage(final DataOutput sink, final Page page, final @Nonnull SerializationType type)
throws IOException {
sink.writeByte(TEXTVALUEPAGE.mId);
page.serialize(sink, type);
}
@Override
public @Nonnull Page getInstance(final Page page, final PageReadOnlyTrx pageReadTrx) {
return new PathPage();
}
},
/**
* {@link CASPage}.
*/
CASPAGE((byte) 8, CASPage.class) {
@Override
@Nonnull
Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx, final SerializationType type)
throws IOException {
return new CASPage(source, type);
}
@Override
void serializePage(final DataOutput sink, final Page page, final SerializationType type) throws IOException {
sink.writeByte(CASPAGE.mId);
page.serialize(sink, type);
}
@Override
public @Nonnull Page getInstance(final Page page, final PageReadOnlyTrx pageReadTrx) {
return new CASPage();
}
},
/**
* {@link AttributeValuePage}.
*/
OVERFLOWPAGE((byte) 9, OverflowPage.class) {
@Override
@Nonnull
Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx, final SerializationType type)
throws IOException {
return new OverflowPage(source);
}
@Override
void serializePage(final DataOutput sink, final Page page, @Nonnull SerializationType type) throws IOException {
sink.writeByte(OVERFLOWPAGE.mId);
page.serialize(sink, type);
}
@Override
public @Nonnull Page getInstance(final Page page, final PageReadOnlyTrx pageReadTrx) {
return new OverflowPage();
}
},
/**
* {@link PathPage}.
*/
PATHPAGE((byte) 10, PathPage.class) {
@Override
void serializePage(DataOutput sink, @Nonnull Page page, @Nonnull SerializationType type) throws IOException {
sink.writeByte(PATHPAGE.mId);
page.serialize(sink, type);
}
@Override
Page deserializePage(DataInput source, @Nonnull PageReadOnlyTrx pageReadTrx, @Nonnull SerializationType type)
throws IOException {
return new PathPage(source, type);
}
@Override
public @Nonnull Page getInstance(Page page, @Nonnull PageReadOnlyTrx pageReadTrx) {
return new PathPage();
}
};
/** Mapping of keys -> page */
private static final Map INSTANCEFORID = new HashMap<>();
/** Mapping of class -> page. */
private static final Map, PageKind> INSTANCEFORCLASS = new HashMap<>();
static {
for (final PageKind page : values()) {
INSTANCEFORID.put(page.mId, page);
INSTANCEFORCLASS.put(page.mClass, page);
}
}
/** Unique ID. */
private final byte mId;
/** Class. */
private final Class mClass;
/**
* Constructor.
*
* @param pId unique identifier
* @param clazz class
*/
PageKind(final byte pId, final Class clazz) {
mId = pId;
mClass = clazz;
}
/**
* Get the unique page ID.
*
* @return unique page ID
*/
public byte getID() {
return mId;
}
/**
* Serialize page.
*
* @param sink {@link DataInput} instance
* @param page {@link Page} implementation
*/
abstract void serializePage(final DataOutput sink, final Page page, final SerializationType type) throws IOException;
/**
* Deserialize page.
*
* @param source {@link DataInput} instance
* @param pageReadTrx implementing {@link PageReadOnlyTrx} instance
* @return page instance implementing the {@link Page} interface
*/
abstract Page deserializePage(final DataInput source, final PageReadOnlyTrx pageReadTrx, final SerializationType type)
throws IOException;
/**
* Public method to get the related page based on the identifier.
*
* @param id the identifier for the page
* @return the related page
*/
public static PageKind getKind(final byte id) {
final PageKind page = INSTANCEFORID.get(id);
if (page == null) {
throw new IllegalStateException();
}
return page;
}
/**
* Public method to get the related page based on the class.
*
* @param clazz the class for the page
* @return the related page
*/
public static @Nonnull PageKind getKind(final Class clazz) {
final PageKind page = INSTANCEFORCLASS.get(clazz);
if (page == null) {
throw new IllegalStateException();
}
return page;
}
/**
* New page instance.
*
* @param page instance of class which implements {@link Page}
* @param pageReadTrx instance of class which implements {@link PageReadOnlyTrx}
* @return new page instance
*/
public abstract @Nonnull Page getInstance(final Page page, final PageReadOnlyTrx pageReadTrx);
}
