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/*
* Copyright 2006 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* 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.amazon.carbonado.layout;
import org.cojen.classfile.TypeDesc;
import com.amazon.carbonado.FetchException;
import com.amazon.carbonado.PersistException;
import com.amazon.carbonado.SupportException;
import com.amazon.carbonado.info.StorableProperty;
import com.amazon.carbonado.info.StorablePropertyAdapter;
import com.amazon.carbonado.info.StorablePropertyAnnotation;
import com.amazon.carbonado.util.AnnotationDescPrinter;
/**
* Describes how a property is defined in a specific generation of a storable.
*
* @author Brian S O'Neill
* @see Layout
*/
public class LayoutProperty {
private final StoredLayoutProperty mStoredLayoutProperty;
/**
* Creates a LayoutProperty around an existing storable.
*/
LayoutProperty(StoredLayoutProperty storedLayoutProperty) {
mStoredLayoutProperty = storedLayoutProperty;
}
/**
* Copies properties into a freshly prepared storable. Call insert (on this
* class) to persist it.
*
* @param storedLayoutProperty freshly prepared storable
* @param property source of data to copy into storable
*/
LayoutProperty(StoredLayoutProperty storedLayoutProperty,
StorableProperty<?> property,
long layoutID,
int ordinal)
{
mStoredLayoutProperty = storedLayoutProperty;
storedLayoutProperty.setLayoutID(layoutID);
storedLayoutProperty.setOrdinal(ordinal);
storedLayoutProperty.setPropertyName(property.getName());
storedLayoutProperty.setPropertyTypeDescriptor
(TypeDesc.forClass(property.getType()).getDescriptor());
storedLayoutProperty.setNullable(property.isNullable());
storedLayoutProperty.setVersion(property.isVersion());
storedLayoutProperty.setPrimaryKeyMember(property.isPrimaryKeyMember());
if (property.getAdapter() != null) {
StorablePropertyAdapter adapter = property.getAdapter();
StorablePropertyAnnotation spa = adapter.getAnnotation();
if (spa == null || spa.getAnnotation() == null) {
storedLayoutProperty.setAdapterTypeName(null);
storedLayoutProperty.setAdapterParams(null);
} else {
storedLayoutProperty.setAdapterTypeName(spa.getAnnotationType().getName());
StringBuilder b = new StringBuilder();
AnnotationDescPrinter printer = new AnnotationDescPrinter(true, b);
printer.visit(spa.getAnnotation());
storedLayoutProperty.setAdapterParams(b.toString());
}
}
}
public String getPropertyName() {
return mStoredLayoutProperty.getPropertyName();
}
/**
* Property type descriptor is a Java type descriptor.
*/
public String getPropertyTypeDescriptor() {
return mStoredLayoutProperty.getPropertyTypeDescriptor();
}
public Class getPropertyType() throws SupportException {
return getPropertyType(null);
}
public Class getPropertyType(ClassLoader loader) throws SupportException {
TypeDesc type = TypeDesc.forDescriptor(getPropertyTypeDescriptor());
Class propClass = type.toClass(loader);
if (propClass == null) {
throw new SupportException
("Unable to find class \"" + type.getRootName() + "\" for property \"" +
getPropertyName() + '"');
}
return propClass;
}
/**
* Returns true of property can be set to null.
*/
public boolean isNullable() {
return mStoredLayoutProperty.isNullable();
}
/**
* Returns true if property is a member of the primary key.
*/
public boolean isPrimaryKeyMember() {
return mStoredLayoutProperty.isPrimaryKeyMember();
}
/**
* Returns true if this property is the designated version number for the
* Storable.
*/
public boolean isVersion() {
return mStoredLayoutProperty.isVersion();
}
/**
* Adapter type name is a fully qualified Java class name. If property has
* no adapter, then null is returned.
*/
public String getAdapterTypeName() {
return mStoredLayoutProperty.getAdapterTypeName();
}
/**
* Parameters for adapter, or null if property has no explicit adapter.
*/
public String getAdapterParams() {
return mStoredLayoutProperty.getAdapterParams();
}
@Override
public int hashCode() {
return mStoredLayoutProperty.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof LayoutProperty) {
StoredLayoutProperty thisStoredLayoutProperty = mStoredLayoutProperty;
StoredLayoutProperty other = ((LayoutProperty) obj).mStoredLayoutProperty;
boolean result = thisStoredLayoutProperty.equalProperties(other);
if (result) {
return result;
}
// Version might be only difference, which is fine.
if (thisStoredLayoutProperty.getVersionNumber() != other.getVersionNumber()) {
thisStoredLayoutProperty = thisStoredLayoutProperty.copy();
thisStoredLayoutProperty.setVersionNumber(other.getVersionNumber());
return thisStoredLayoutProperty.equalProperties(other);
}
}
return false;
}
@Override
public String toString() {
return mStoredLayoutProperty.toString();
}
void store() throws PersistException {
if (!mStoredLayoutProperty.tryInsert()) {
StoredLayoutProperty existing = mStoredLayoutProperty.copy();
try {
existing.load();
existing.copyVersionProperty(mStoredLayoutProperty);
} catch (FetchException e) {
throw e.toPersistException();
}
mStoredLayoutProperty.update();
}
}
}
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