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Blueprints property graph implementation for the DEX graph database
/**
*
*/
package com.tinkerpop.blueprints.impls.dex;
import com.tinkerpop.blueprints.Element;
import com.tinkerpop.blueprints.util.ElementHelper;
import com.tinkerpop.blueprints.util.ExceptionFactory;
import com.tinkerpop.blueprints.util.StringFactory;
import java.util.HashSet;
import java.util.Set;
/**
* {@link Element} implementation for Dex.
*
* All elements are typed or labeled. The way to get the type or label for an
* element is retrieving the property {@link StringFactory#LABEL}. This
* property cannot be set or removed.
*
* TODO: When a Float value is set for an attribute, it is stored as a Double
* value. Thus, when it is retrieved later, it is retrieved as a Double and not
* as a Float.
*
* @author Sparsity
* Technologies
*/
class DexElement implements Element {
/**
* DexGraph instance.
*/
protected DexGraph graph = null;
/**
* Dex OID.
*/
protected long oid = com.sparsity.dex.gdb.Objects.InvalidOID;
/**
* Dex object type.
*
* It is loaded as late as possible (and just if required).
*
* @see #getObjectType()
*/
private int type = com.sparsity.dex.gdb.Type.InvalidType;
/**
* Gets the Dex object type.
*
* If it has not been loaded yet, it is retrieved from Dex database.
*
* @return The element type.
*/
protected int getObjectType() {
if (type == com.sparsity.dex.gdb.Type.InvalidType) {
type = graph.getRawGraph().getObjectType(oid);
}
return type;
}
/**
* Gets the type or label of the element.
*
* The label is the name of the Dex object type.
*
* @return Type or label of the element.
*/
protected String getTypeLabel() {
return graph.getRawGraph().getType(getObjectType()).getName();
}
/**
* Creates a new instance.
*
* @param g DexGraph.
* @param oid Dex OID.
*/
protected DexElement(final DexGraph g, final long oid) {
assert g != null;
assert oid != com.sparsity.dex.gdb.Objects.InvalidOID;
this.graph = g;
this.oid = oid;
}
/*
* (non-Javadoc)
*
* @see com.tinkerpop.blueprints.Element#getProperty(java.lang.String)
*/
@Override
public Object getProperty(final String key) {
int type = getObjectType();
if (key.compareTo(StringFactory.LABEL) == 0) {
com.sparsity.dex.gdb.Type tdata = graph.getRawGraph().getType(type);
return tdata.getName();
}
int attr = graph.getRawGraph().findAttribute(getObjectType(), key);
if (attr == com.sparsity.dex.gdb.Attribute.InvalidAttribute) {
return null;
}
com.sparsity.dex.gdb.Attribute adata = graph.getRawGraph().getAttribute(attr);
assert adata != null;
com.sparsity.dex.gdb.Value v = new com.sparsity.dex.gdb.Value();
graph.getRawGraph().getAttribute(oid, attr, v);
Object result = null;
if (!v.isNull()) {
switch (v.getDataType()) {
case Boolean:
result = v.getBoolean();
break;
case Integer:
result = v.getInteger();
break;
case String:
result = v.getString();
break;
case Double:
result = v.getDouble();
break;
default:
throw new UnsupportedOperationException(DexTokens.TYPE_EXCEPTION_MESSAGE);
}
}
return result;
}
/*
* (non-Javadoc)
*
* @see com.tinkerpop.blueprints.Element#getPropertyKeys()
*/
@Override
public Set getPropertyKeys() {
com.sparsity.dex.gdb.AttributeList alist = graph.getRawGraph().getAttributes(oid);
Set attrKeys = new HashSet();
for (Integer attr : alist) {
String key = graph.getRawGraph().getAttribute(attr).getName();
attrKeys.add(key);
}
alist.delete();
alist = null;
return attrKeys;
}
/*
* (non-Javadoc)
*
* @see com.tinkerpop.blueprints.Element#setProperty(java.lang.String,
* java.lang.Object)
*/
@Override
public void setProperty(final String key, final Object value) {
//System.out.println(this + "!!" + key + "!!" + value);
if (key.equals(StringFactory.ID))
throw ExceptionFactory.propertyKeyIdIsReserved();
if (key.equals(StringFactory.LABEL))
throw new IllegalArgumentException("Property key is reserved for all nodes and edges: " + StringFactory.LABEL);
if (key.equals(StringFactory.EMPTY_STRING))
throw ExceptionFactory.elementKeyCanNotBeEmpty();
int attr = graph.getRawGraph().findAttribute(getObjectType(), key);
com.sparsity.dex.gdb.DataType datatype = null;
if (attr == com.sparsity.dex.gdb.Attribute.InvalidAttribute) {
//
// First time we set this attribute, let's create it.
//
if (value instanceof Boolean) {
datatype = com.sparsity.dex.gdb.DataType.Boolean;
} else if (value instanceof Integer) {
datatype = com.sparsity.dex.gdb.DataType.Integer;
} else if (value instanceof String) {
datatype = com.sparsity.dex.gdb.DataType.String;
} else if (value instanceof Double || value instanceof Float) {
datatype = com.sparsity.dex.gdb.DataType.Double;
} else if (value instanceof com.sparsity.dex.gdb.Value) {
datatype = ((com.sparsity.dex.gdb.Value) value).getDataType();
} else {
throw new IllegalArgumentException(DexTokens.TYPE_EXCEPTION_MESSAGE);
}
assert datatype != null;
attr = graph.getRawGraph().newAttribute(type, key, datatype, com.sparsity.dex.gdb.AttributeKind.Basic);
assert attr != com.sparsity.dex.gdb.Attribute.InvalidAttribute;
} else {
datatype = graph.getRawGraph().getAttribute(attr).getDataType();
}
//
// Set the Value
//
com.sparsity.dex.gdb.Value v = new com.sparsity.dex.gdb.Value();
if (value instanceof com.sparsity.dex.gdb.Value) {
v = (com.sparsity.dex.gdb.Value) value;
} else {
// from Object to Value
switch (datatype) {
case Boolean:
v.setBooleanVoid((Boolean) value);
break;
case Integer:
v.setIntegerVoid((Integer) value);
break;
case String:
v.setString((String) value);
break;
case Double:
if (value instanceof Double) {
v.setDouble((Double) value);
}
if (value instanceof Float) {
v.setDouble(((Float) value));
}
break;
default:
throw new IllegalArgumentException(DexTokens.TYPE_EXCEPTION_MESSAGE);
}
}
//try {
this.graph.getRawGraph().setAttribute(oid, attr, v);
//} catch(RuntimeException e) {
//System.out.println("\t" + this + "!!" + attr + "!!" + v);
// throw e;
//}
}
/*
* (non-Javadoc)
*
* @see
* com.tinkerpop.blueprints.Element#removeProperty(java.lang.String)
*/
@Override
public Object removeProperty(final String key) {
try {
Object ret = getProperty(key);
com.sparsity.dex.gdb.Value v = new com.sparsity.dex.gdb.Value();
v.setNull();
setProperty(key, v);
return ret;
} catch (RuntimeException e) {
return null;
}
}
/*
* (non-Javadoc)
*
* @see com.tinkerpop.blueprints.Element#getId()
*/
@Override
public Object getId() {
return oid;
}
public boolean equals(final Object object) {
return ElementHelper.areEqual(this, object);
}
@Override
public int hashCode() {
return (int) oid;
}
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