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/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.xml.ws.policy.sourcemodel;
import com.sun.xml.ws.policy.privateutil.LocalizationMessages;
import com.sun.xml.ws.policy.privateutil.PolicyLogger;
import com.sun.xml.ws.policy.privateutil.PolicyUtils;
import com.sun.xml.ws.policy.sourcemodel.wspolicy.XmlToken;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
/**
* The general representation of a single node within a {@link com.sun.xml.ws.policy.sourcemodel.PolicySourceModel} instance.
* The model node is created via factory methods of the {@link com.sun.xml.ws.policy.sourcemodel.PolicySourceModel} instance.
* It may also hold {@link com.sun.xml.ws.policy.sourcemodel.AssertionData} instance in case its type is {@code ModelNode.Type.ASSERTION}.
*
* @author Marek Potociar
*/
public final class ModelNode implements Iterable, Cloneable {
private static final PolicyLogger LOGGER = PolicyLogger.getLogger(ModelNode.class);
/**
* Policy source model node type enumeration
*/
public static enum Type {
POLICY(XmlToken.Policy),
ALL(XmlToken.All),
EXACTLY_ONE(XmlToken.ExactlyOne),
POLICY_REFERENCE(XmlToken.PolicyReference),
ASSERTION(XmlToken.UNKNOWN),
ASSERTION_PARAMETER_NODE(XmlToken.UNKNOWN);
private XmlToken token;
Type(XmlToken token) {
this.token = token;
}
public XmlToken getXmlToken() {
return token;
}
/**
* Method checks the PSM state machine if the creation of new child of given type is plausible for a node element
* with type set to this type instance.
*
* @param childType The type.
* @return True if the type is supported, false otherwise
*/
private boolean isChildTypeSupported(final Type childType) {
switch (this) {
case POLICY:
case ALL:
case EXACTLY_ONE:
switch (childType) {
case ASSERTION_PARAMETER_NODE:
return false;
default:
return true;
}
case POLICY_REFERENCE:
return false;
case ASSERTION:
switch (childType) {
case POLICY:
case POLICY_REFERENCE:
case ASSERTION_PARAMETER_NODE:
return true;
default:
return false;
}
case ASSERTION_PARAMETER_NODE:
switch (childType) {
case ASSERTION_PARAMETER_NODE:
return true;
default:
return false;
}
default:
throw LOGGER.logSevereException(new IllegalStateException(
LocalizationMessages.WSP_0060_POLICY_ELEMENT_TYPE_UNKNOWN(this)));
}
}
}
// comon model node attributes
private LinkedList children;
private Collection unmodifiableViewOnContent;
private final ModelNode.Type type;
private ModelNode parentNode;
private PolicySourceModel parentModel;
// attributes used only in 'POLICY_REFERENCE' model node
private PolicyReferenceData referenceData;
private PolicySourceModel referencedModel;
// attibutes used only in 'ASSERTION' or 'ASSERTION_PARAMETER_NODE' model node
private AssertionData nodeData;
/**
* The factory method creates and initializes the POLICY model node and sets it's parent model reference to point to
* the model supplied as an input parameter. This method is intended to be used ONLY from {@link PolicySourceModel} during
* the initialization of its own internal structures.
*
* @param model policy source model to be used as a parent model of the newly created {@link ModelNode}. Must not be {@code null}
* @return POLICY model node with the parent model reference initialized to the model supplied as an input parameter
* @throws IllegalArgumentException if the {@code model} input parameter is {@code null}
*/
static ModelNode createRootPolicyNode(final PolicySourceModel model) throws IllegalArgumentException {
if (model == null) {
throw LOGGER.logSevereException(new IllegalArgumentException(LocalizationMessages.WSP_0039_POLICY_SRC_MODEL_INPUT_PARAMETER_MUST_NOT_BE_NULL()));
}
return new ModelNode(ModelNode.Type.POLICY, model);
}
private ModelNode(Type type, PolicySourceModel parentModel) {
this.type = type;
this.parentModel = parentModel;
this.children = new LinkedList();
this.unmodifiableViewOnContent = Collections.unmodifiableCollection(this.children);
}
private ModelNode(Type type, PolicySourceModel parentModel, AssertionData data) {
this(type, parentModel);
this.nodeData = data;
}
private ModelNode(PolicySourceModel parentModel, PolicyReferenceData data) {
this(Type.POLICY_REFERENCE, parentModel);
this.referenceData = data;
}
private void checkCreateChildOperationSupportForType(final Type type) throws UnsupportedOperationException {
if (!this.type.isChildTypeSupported(type)) {
throw LOGGER.logSevereException(new UnsupportedOperationException(LocalizationMessages.WSP_0073_CREATE_CHILD_NODE_OPERATION_NOT_SUPPORTED(type, this.type)));
}
}
/**
* Factory method that creates new policy source model node as specified by a factory method name and input parameters.
* Each node is created with respect to its enclosing policy source model.
*
* @return A new Policy node.
*/
public ModelNode createChildPolicyNode() {
checkCreateChildOperationSupportForType(Type.POLICY);
final ModelNode node = new ModelNode(ModelNode.Type.POLICY, parentModel);
this.addChild(node);
return node;
}
/**
* Factory method that creates new policy source model node as specified by a factory method name and input parameters.
* Each node is created with respect to its enclosing policy source model.
*
* @return A new All node.
*/
public ModelNode createChildAllNode() {
checkCreateChildOperationSupportForType(Type.ALL);
final ModelNode node = new ModelNode(ModelNode.Type.ALL, parentModel);
this.addChild(node);
return node;
}
/**
* Factory method that creates new policy source model node as specified by a factory method name and input parameters.
* Each node is created with respect to its enclosing policy source model.
*
* @return A new ExactlyOne node.
*/
public ModelNode createChildExactlyOneNode() {
checkCreateChildOperationSupportForType(Type.EXACTLY_ONE);
final ModelNode node = new ModelNode(ModelNode.Type.EXACTLY_ONE, parentModel);
this.addChild(node);
return node;
}
/**
* Factory method that creates new policy source model node as specified by a factory method name and input parameters.
* Each node is created with respect to its enclosing policy source model.
*
* @return A new policy assertion node.
*/
public ModelNode createChildAssertionNode() {
checkCreateChildOperationSupportForType(Type.ASSERTION);
final ModelNode node = new ModelNode(ModelNode.Type.ASSERTION, parentModel);
this.addChild(node);
return node;
}
/**
* Factory method that creates new policy source model node as specified by a factory method name and input parameters.
* Each node is created with respect to its enclosing policy source model.
*
* @param nodeData The policy assertion data.
* @return A new policy assertion node.
*/
public ModelNode createChildAssertionNode(final AssertionData nodeData) {
checkCreateChildOperationSupportForType(Type.ASSERTION);
final ModelNode node = new ModelNode(Type.ASSERTION, parentModel, nodeData);
this.addChild(node);
return node;
}
/**
* Factory method that creates new policy source model node as specified by a factory method name and input parameters.
* Each node is created with respect to its enclosing policy source model.
*
* @return A new assertion parameter node.
*/
public ModelNode createChildAssertionParameterNode() {
checkCreateChildOperationSupportForType(Type.ASSERTION_PARAMETER_NODE);
final ModelNode node = new ModelNode(ModelNode.Type.ASSERTION_PARAMETER_NODE, parentModel);
this.addChild(node);
return node;
}
/**
* Factory method that creates new policy source model node as specified by a factory method name and input parameters.
* Each node is created with respect to its enclosing policy source model.
*
* @param nodeData The assertion parameter data.
* @return A new assertion parameter node.
*/
ModelNode createChildAssertionParameterNode(final AssertionData nodeData) {
checkCreateChildOperationSupportForType(Type.ASSERTION_PARAMETER_NODE);
final ModelNode node = new ModelNode(Type.ASSERTION_PARAMETER_NODE, parentModel, nodeData);
this.addChild(node);
return node;
}
/**
* Factory method that creates new policy source model node as specified by a factory method name and input parameters.
* Each node is created with respect to its enclosing policy source model.
*
* @param referenceData The PolicyReference data.
* @return A new PolicyReference node.
*/
ModelNode createChildPolicyReferenceNode(final PolicyReferenceData referenceData) {
checkCreateChildOperationSupportForType(Type.POLICY_REFERENCE);
final ModelNode node = new ModelNode(parentModel, referenceData);
this.parentModel.addNewPolicyReference(node);
this.addChild(node);
return node;
}
Collection getChildren() {
return unmodifiableViewOnContent;
}
/**
* Sets the parent model reference on the node and its children. The method may be invoked only on the root node
* of the policy source model (or - in general - on a model node that dose not reference a parent node). Otherwise an
* exception is thrown.
*
* @param model new parent policy source model to be set.
* @throws IllegalAccessException in case this node references a parent node (i.e. is not a root node of the model).
*/
void setParentModel(final PolicySourceModel model) throws IllegalAccessException {
if (parentNode != null) {
throw LOGGER.logSevereException(new IllegalAccessException(LocalizationMessages.WSP_0049_PARENT_MODEL_CAN_NOT_BE_CHANGED()));
}
this.updateParentModelReference(model);
}
/**
* The method updates the parentModel reference on current model node instance and all of it's children
*
* @param model new policy source model reference.
*/
private void updateParentModelReference(final PolicySourceModel model) {
this.parentModel = model;
for (ModelNode child : children) {
child.updateParentModelReference(model);
}
}
/**
* Returns the parent policy source model that contains this model node.
*
* @return the parent policy source model
*/
public PolicySourceModel getParentModel() {
return parentModel;
}
/**
* Returns the type of this policy source model node.
*
* @return actual type of this policy source model node
*/
public ModelNode.Type getType() {
return type;
}
/**
* Returns the parent referenced by this policy source model node.
*
* @return current parent of this policy source model node or {@code null} if the node does not have a parent currently.
*/
public ModelNode getParentNode() {
return parentNode;
}
/**
* Returns the data for this policy source model node (if any). The model node data are expected to be not {@code null} only in
* case the type of this node is ASSERTION or ASSERTION_PARAMETER_NODE.
*
* @return the data of this policy source model node or {@code null} if the node does not have any data associated to it
* attached.
*/
public AssertionData getNodeData() {
return nodeData;
}
/**
* Returns the policy reference data for this policy source model node. The policy reference data are expected to be not {@code null} only in
* case the type of this node is POLICY_REFERENCE.
*
* @return the policy reference data for this policy source model node or {@code null} if the node does not have any policy reference data
* attached.
*/
PolicyReferenceData getPolicyReferenceData() {
return referenceData;
}
/**
* The method may be used to set or replace assertion data set for this node. If there are assertion data set already,
* those are replaced by a new reference and eventualy returned from the method.
*
* This method is supported only in case this model node instance's type is {@code ASSERTION} or {@code ASSERTION_PARAMETER_NODE}.
* If used from other node types, an exception is thrown.
*
* @param newData new assertion data to be set.
* @return old and replaced assertion data if any or {@code null} otherwise.
*
* @throws UnsupportedOperationException in case this method is called on nodes of type other than {@code ASSERTION}
* or {@code ASSERTION_PARAMETER_NODE}
*/
public AssertionData setOrReplaceNodeData(final AssertionData newData) {
if (!isDomainSpecific()) {
throw LOGGER.logSevereException(new UnsupportedOperationException(LocalizationMessages.WSP_0051_OPERATION_NOT_SUPPORTED_FOR_THIS_BUT_ASSERTION_RELATED_NODE_TYPE(type)));
}
final AssertionData oldData = this.nodeData;
this.nodeData = newData;
return oldData;
}
/**
* The method specifies whether the model node instance represents assertion related node, it means whether its type
* is 'ASSERTION' or 'ASSERTION_PARAMETER_NODE'. This is, for example, the way to determine whether the node supports
* setting a {@link AssertionData} object via {@link #setOrReplaceNodeData(AssertionData)} method or not.
*
* @return {@code true} or {@code false} according to whether the node instance represents assertion related node or not.
*/
boolean isDomainSpecific() {
return type == Type.ASSERTION || type == Type.ASSERTION_PARAMETER_NODE;
}
/**
* Appends the specified child node to the end of the children list of this node and sets it's parent to reference
* this node.
*
* @param child node to be appended to the children list of this node.
* @return {@code true} (as per the general contract of the {@code Collection.add} method).
*
* @throws NullPointerException if the specified node is {@code null}.
* @throws IllegalArgumentException if child has a parent node set already to point to some node
*/
private boolean addChild(final ModelNode child) {
children.add(child);
child.parentNode = this;
return true;
}
void setReferencedModel(final PolicySourceModel model) {
if (this.type != Type.POLICY_REFERENCE) {
throw LOGGER.logSevereException(new UnsupportedOperationException(LocalizationMessages.WSP_0050_OPERATION_NOT_SUPPORTED_FOR_THIS_BUT_POLICY_REFERENCE_NODE_TYPE(type)));
}
referencedModel = model;
}
PolicySourceModel getReferencedModel() {
return referencedModel;
}
/**
* Returns the number of child policy source model nodes. If this model node contains
* more than {@code Integer.MAX_VALUE} children, returns {@code Integer.MAX_VALUE}.
*
* @return the number of children of this node.
*/
public int childrenSize() {
return children.size();
}
/**
* Returns true if the node has at least one child node.
*
* @return true if the node has at least one child node, false otherwise.
*/
public boolean hasChildren() {
return !children.isEmpty();
}
/**
* Iterates through all child nodes.
*
* @return An iterator for the child nodes
*/
public Iterator iterator() {
return children.iterator();
}
/**
* An {@code Object.equals(Object obj)} method override. Method ignores the parent source model. It means that two
* model nodes may be the same even if they belong to different models.
*
* If parent model comparison is desired, it must be accomplished separately. To perform that, the reference equality
* test is sufficient ({@code nodeA.getParentModel() == nodeB.getParentModel()}), since all model nodes are created
* for specific model instances.
*/
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof ModelNode)) {
return false;
}
boolean result = true;
final ModelNode that = (ModelNode) obj;
result = result && this.type.equals(that.type);
// result = result && ((this.parentNode == null) ? that.parentNode == null : this.parentNode.equals(that.parentNode));
result = result && ((this.nodeData == null) ? that.nodeData == null : this.nodeData.equals(that.nodeData));
result = result && ((this.children == null) ? that.children == null : this.children.equals(that.children));
return result;
}
/**
* An {@code Object.hashCode()} method override.
*/
@Override
public int hashCode() {
int result = 17;
result = 37 * result + this.type.hashCode();
result = 37 * result + ((this.parentNode == null) ? 0 : this.parentNode.hashCode());
result = 37 * result + ((this.nodeData == null) ? 0 : this.nodeData.hashCode());
result = 37 * result + this.children.hashCode();
return result;
}
/**
* Returns a string representation of the object. In general, the toString method
* returns a string that "textually represents" this object.
*
* @return a string representation of the object.
*/
@Override
public String toString() {
return toString(0, new StringBuffer()).toString();
}
/**
* A helper method that appends indented string representation of this instance to the input string buffer.
*
* @param indentLevel indentation level to be used.
* @param buffer buffer to be used for appending string representation of this instance
* @return modified buffer containing new string representation of the instance
*/
public StringBuffer toString(final int indentLevel, final StringBuffer buffer) {
final String indent = PolicyUtils.Text.createIndent(indentLevel);
final String innerIndent = PolicyUtils.Text.createIndent(indentLevel + 1);
buffer.append(indent).append(type).append(" {").append(PolicyUtils.Text.NEW_LINE);
if (type == Type.ASSERTION) {
if (nodeData == null) {
buffer.append(innerIndent).append("no assertion data set");
} else {
nodeData.toString(indentLevel + 1, buffer);
}
buffer.append(PolicyUtils.Text.NEW_LINE);
} else if (type == Type.POLICY_REFERENCE) {
if (referenceData == null) {
buffer.append(innerIndent).append("no policy reference data set");
} else {
referenceData.toString(indentLevel + 1, buffer);
}
buffer.append(PolicyUtils.Text.NEW_LINE);
} else if (type == Type.ASSERTION_PARAMETER_NODE) {
if (nodeData == null) {
buffer.append(innerIndent).append("no parameter data set");
}
else {
nodeData.toString(indentLevel + 1, buffer);
}
buffer.append(PolicyUtils.Text.NEW_LINE);
}
if (children.size() > 0) {
for (ModelNode child : children) {
child.toString(indentLevel + 1, buffer).append(PolicyUtils.Text.NEW_LINE);
}
} else {
buffer.append(innerIndent).append("no child nodes").append(PolicyUtils.Text.NEW_LINE);
}
buffer.append(indent).append('}');
return buffer;
}
@Override
protected ModelNode clone() throws CloneNotSupportedException {
final ModelNode clone = (ModelNode) super.clone();
if (this.nodeData != null) {
clone.nodeData = this.nodeData.clone();
}
// no need to clone PolicyReferenceData, since those are immutable
if (this.referencedModel != null) {
clone.referencedModel = this.referencedModel.clone();
}
clone.children = new LinkedList();
clone.unmodifiableViewOnContent = Collections.unmodifiableCollection(clone.children);
for (ModelNode thisChild : this.children) {
clone.addChild(thisChild.clone());
}
return clone;
}
PolicyReferenceData getReferenceData() {
return referenceData;
}
}