/*
* Copyright (c) 2009, SQL Power Group Inc.
*
* This file is part of Wabit.
*
* Wabit is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Wabit is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package ca.sqlpower.dao;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Arrays;
import ca.sqlpower.dao.SPPersister.DataType;
import ca.sqlpower.object.SPObject;
import ca.sqlpower.util.SQLPowerUtils;
/**
* A class representing an individual persisted {@link SPObject}
* property.
*/
public class PersistedSPOProperty implements SPTransactionElement, Comparable<PersistedSPOProperty> {
private final String uuid;
private final String propertyName;
private final DataType dataType;
private final Object oldValue;
private final Object newValue;
private final boolean unconditional;
/**
* Constructor to persist a {@link SPObject} property, keeping track
* of all the parameters of the persistProperty(...) method call. These
* fields will be necessary for when commit() is called.
*
* @param propertyName
* The name of the property to persist
* @param newValue
* The property value to persist
* @param unconditional
* Whether or not to validate if oldValue matches the actual
* property value before persisting
*/
public PersistedSPOProperty(String uuid, String propertyName,
DataType dataType, Object oldValue, Object newValue,
boolean unconditional) {
this.uuid = uuid;
this.propertyName = propertyName;
this.newValue = newValue;
this.oldValue = oldValue;
this.unconditional = unconditional;
this.dataType = dataType;
}
/**
* Accessor for the property name field
*
* @return The property name to persist upon
*/
public String getPropertyName() {
return propertyName;
}
/**
* Accessor for the property value to persist
*
* @return The property value to persist
*/
public Object getNewValue() {
return newValue;
}
/**
* Accessor for the unconditional persist determinant
*
* @return The unconditional field
*/
public boolean isUnconditional() {
return unconditional;
}
public DataType getDataType() {
return dataType;
}
public Object getOldValue() {
return oldValue;
}
public String getUUID() {
return uuid;
}
@Override
public String toString() {
return "SPObjectProperty [uuid=" + uuid + ", propertyName="
+ propertyName + ", dataType=" + dataType + ", oldValue="
+ oldValue + ", newValue=" + newValue + ", unconditional="
+ unconditional + "]";
}
@Override
public boolean equals(Object obj) {
if (obj == null || obj.getClass() != this.getClass()) {
return false;
}
PersistedSPOProperty wop = (PersistedSPOProperty) obj;
if (!isUnconditional() && !wop.isUnconditional()
&& !SQLPowerUtils.areEqual(getOldValue(), wop.getOldValue())) {
return false;
}
if (isUnconditional() == wop.isUnconditional()
&& getUUID().equals(wop.getUUID())
&& getPropertyName().equals(wop.getPropertyName())
&& getDataType().equals(wop.getDataType())) {
if (getDataType().equals(DataType.PNG_IMG)) {
return imageObjectsAreEqual(getNewValue(), wop.getNewValue());
} else {
if (getNewValue() == null) {
return wop.getNewValue() == null;
} else {
return getNewValue().equals(wop.getNewValue());
}
}
} else {
return false;
}
}
/**
* Compare two property values of PersistedSPOProperty objects that are an image type.
*
* @param a Image property of type ByteArrayInputStream
* @param b Image property of type ByteArrayInputStream
*
* @throws IllegalArgumentException thrown if one or both parameters are not ByteArrayInputStreams
*/
public static boolean imageObjectsAreEqual(Object a, Object b) throws IllegalArgumentException {
if (a instanceof ByteArrayInputStream) {
ByteArrayInputStream aStream = (ByteArrayInputStream) a;
ByteArrayInputStream bStream = (ByteArrayInputStream) b;
byte[] aBytes = new byte[aStream.available()];
byte[] bBytes = new byte[bStream.available()];
try {
aStream.mark(-1); // No mark limit
aStream.read(aBytes);
aStream.reset();
bStream.mark(-1); // No mark limit
bStream.read(bBytes);
bStream.reset();
} catch (IOException e) {
throw new RuntimeException(e);
}
return Arrays.equals(aBytes, bBytes);
} else {
throw new IllegalArgumentException();
}
}
@Override
public int hashCode() {
final int prime = 31;
int result = 17;
result = prime * result + (unconditional ? 1 : 0);
result = prime * result + ((oldValue == null) ? 0 : oldValue.hashCode());
result = prime * result + uuid.hashCode();
result = prime * result + propertyName.hashCode();
result = prime * result + dataType.hashCode();
result = prime * result + ((newValue == null) ? 0 : newValue.hashCode());
return result;
}
public int compareTo(PersistedSPOProperty p) {
return (getUUID() + getPropertyName()).compareTo(p.getUUID() + p.getPropertyName());
}
}