/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.airavata.workflow.model.graph.system;
import java.util.List;
import javax.xml.namespace.QName;
import org.apache.airavata.common.utils.WSConstants;
import org.apache.airavata.workflow.model.component.Component;
import org.apache.airavata.workflow.model.component.system.ConstantComponent;
import org.apache.airavata.workflow.model.exceptions.WorkflowRuntimeException;
import org.apache.airavata.workflow.model.graph.DataEdge;
import org.apache.airavata.workflow.model.graph.DataPort;
import org.apache.airavata.workflow.model.graph.Edge;
import org.apache.airavata.workflow.model.graph.Graph;
import org.apache.airavata.workflow.model.graph.GraphException;
import org.apache.airavata.workflow.model.graph.GraphSchema;
import org.apache.airavata.workflow.model.graph.Port;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xmlpull.infoset.XmlElement;
public class ConstantNode extends SystemNode {
private static final String DATA_TYPE_QNAME_TAG = "dataType";
private static final String VALUE_TAG_NAME = "value";
private static final Logger logger = LoggerFactory.getLogger(ConstantNode.class);
private QName type;
private Object value;
/**
* Creates a InputNode.
*
* @param graph
*/
public ConstantNode(Graph graph) {
super(graph);
}
/**
* Constructs a InputNode.
*
* @param nodeElement
* @throws GraphException
*/
public ConstantNode(XmlElement nodeElement) throws GraphException {
super(nodeElement);
}
/**
* @see org.apache.airavata.workflow.model.graph.impl.NodeImpl#getComponent()
*/
@Override
public Component getComponent() {
Component component = super.getComponent();
if (component == null) {
// The component is null when read from the graph XML.
component = new ConstantComponent();
setComponent(component);
}
return component;
}
/**
* @see org.apache.airavata.workflow.model.graph.impl.NodeImpl#setName(java.lang.String)
*/
@Override
public void setName(String name) {
super.setName(name);
// Creates the ID to the new one based on the new name. This is
// for readability of workflow scripts.
createID();
}
/**
* Checks if this ConstantNode is connected.
*
* @return true if this InputNode is connected; false otherwise;
*/
public boolean isConnected() {
if (getEdges().size() > 0) {
return true;
} else {
return false;
}
}
/**
* Returns the type of the parameter
*
* @return The type of the parameter (e.g. string, int)
*/
public QName getType() {
return this.type;
}
/**
* Returns the value.
*
* @return The value.
*/
public Object getValue() {
return this.value;
}
/**
* Sets the value.
*
* @param value
* The default value to set.
*/
public void setValue(Object value) {
this.value = value;
}
/**
* Returns the port of this InputNode.
*
* Note that an InputNode always has only one output port.
*
* @return The port
*/
public DataPort getPort() {
return getOutputPorts().get(0);
}
/**
* Returns the first port that this input node is connected to.
*
* @return The first port that this input node is connected to
*/
public Port getConnectedPort() {
return getPort().getEdge(0).getToPort();
}
/**
* Checks if the user input is valid.
*
* @param input
* The user input
* @return true if the user input is valid against the parameter type; false otherwise
*/
public boolean isInputValid(String input) {
logger.debug("Input:" + input);
// TODO now returning true because only string is used.
return true;
}
/**
* Called whan an Edge was added to the parameter port. Change the name of this node.
*
* @throws GraphException
*
* @see org.apache.airavata.workflow.model.graph.impl.NodeImpl#edgeWasAdded(org.apache.airavata.workflow.model.graph.impl.EdgeImpl)
*/
@Override
protected void edgeWasAdded(Edge edge) throws GraphException {
super.edgeWasAdded(edge);
// TODO this method can be removed.
Port toPort = edge.getToPort();
if (edge instanceof DataEdge) {
DataPort toDataPort = (DataPort) toPort;
QName toType = toDataPort.getType();
List edges = getEdges();
if (edges.size() == 1) {
// The first edge.
this.type = toType;
} else if (edges.size() > 1) {
// Not the first edge.
if (!toType.equals(WSConstants.XSD_ANY_TYPE) && !this.type.equals(toType)) {
throw new GraphException("Cannot connect ports with different types.");
}
} else {
// Should not happen.
throw new WorkflowRuntimeException("edges.size(): " + edges.size());
}
}
}
/**
* Called whan an Edge was removed from the parameter port. Change the name of the node.
*
* @see org.apache.airavata.workflow.model.graph.impl.NodeImpl#edgeWasRemoved(org.apache.airavata.workflow.model.graph.impl.EdgeImpl)
*/
@Override
protected void edgeWasRemoved(Edge removedEdge) {
super.edgeWasRemoved(removedEdge);
// TODO this method can be removed.
List<DataEdge> edges = getEdges();
if (edges.size() == 0) {
// The last edge was removed.
this.type = null;
}
}
/**
* @see org.apache.airavata.workflow.model.graph.system.SystemNode#portTypeChanged(org.apache.airavata.workflow.model.graph.system.SystemDataPort)
*/
@Override
protected void portTypeChanged(SystemDataPort port) throws GraphException {
super.portTypeChanged(port);
this.type = port.getType();
}
@Override
protected void parseComponent(XmlElement componentElement) {
// No need to parse the XML.
setComponent(new ConstantComponent());
}
@Override
protected void parseConfiguration(XmlElement configElement) {
super.parseConfiguration(configElement);
XmlElement typeElement = configElement.element(null, DATA_TYPE_QNAME_TAG);
if (typeElement != null) {
String qnameText = typeElement.requiredText();
if (qnameText != null && !qnameText.equals("")) {
this.type = QName.valueOf(qnameText);
}
}
XmlElement element = configElement.element(null, VALUE_TAG_NAME);
if (element != null) {
// It might be a String or XmlElement
for (Object child : element.children()) {
if (child instanceof String) {
if (((String) child).trim().length() == 0) {
// Skip white space before xml element.
continue;
}
}
this.value = child;
break;
}
// this.defaultValue = element.requiredText();
}
}
@Override
protected XmlElement toXML() {
XmlElement nodeElement = super.toXML();
nodeElement.setAttributeValue(GraphSchema.NS, GraphSchema.NODE_TYPE_ATTRIBUTE, GraphSchema.NODE_TYPE_CONSTANT);
return nodeElement;
}
@Override
protected XmlElement addConfigurationElement(XmlElement nodeElement) {
XmlElement configElement = nodeElement.addElement(GraphSchema.NS, GraphSchema.NODE_CONFIG_TAG);
if (this.type != null) {
XmlElement qnameElement = configElement.addElement(GraphSchema.NS, DATA_TYPE_QNAME_TAG);
qnameElement.addChild(this.type.toString());
}
if (this.value != null) {
XmlElement element = configElement.addElement(GraphSchema.NS, VALUE_TAG_NAME);
element.addChild(this.value);
}
return configElement;
}
private List<DataEdge> getEdges() {
DataPort port = getPort();
List<DataEdge> edges = port.getEdges();
return edges;
}
}