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package com.sun.el.parser;
import javax.el.ELException;
import javax.el.MethodInfo;
import javax.el.PropertyNotWritableException;
import com.sun.el.lang.ELSupport;
import com.sun.el.lang.EvaluationContext;
import com.sun.el.util.MessageFactory;
/**
* @author Jacob Hookom [jacob@hookom.net]
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: tcfujii $
*/
public abstract class SimpleNode extends ELSupport implements Node {
protected Node parent;
protected Node[] children;
protected int id;
protected String image;
public SimpleNode(int i) {
id = i;
}
public void jjtOpen() {
}
public void jjtClose() {
}
public void jjtSetParent(Node n) {
parent = n;
}
public Node jjtGetParent() {
return parent;
}
public void jjtAddChild(Node n, int i) {
if (children == null) {
children = new Node[i + 1];
} else if (i >= children.length) {
Node c[] = new Node[i + 1];
System.arraycopy(children, 0, c, 0, children.length);
children = c;
}
children[i] = n;
}
public Node jjtGetChild(int i) {
return children[i];
}
public int jjtGetNumChildren() {
return (children == null) ? 0 : children.length;
}
/*
* You can override these two methods in subclasses of SimpleNode to
* customize the way the node appears when the tree is dumped. If your
* output uses more than one line you should override toString(String),
* otherwise overriding toString() is probably all you need to do.
*/
public String toString() {
if (this.image != null) {
return ELParserTreeConstants.jjtNodeName[id] + "[" + this.image
+ "]";
}
return ELParserTreeConstants.jjtNodeName[id];
}
public String toString(String prefix) {
return prefix + toString();
}
/*
* Override this method if you want to customize how the node dumps out its
* children.
*/
public void dump(String prefix) {
System.out.println(toString(prefix));
if (children != null) {
for (int i = 0; i < children.length; ++i) {
SimpleNode n = (SimpleNode) children[i];
if (n != null) {
n.dump(prefix + " ");
}
}
}
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public Class getType(EvaluationContext ctx)
throws ELException {
throw new UnsupportedOperationException();
}
public Object getValue(EvaluationContext ctx)
throws ELException {
throw new UnsupportedOperationException();
}
public boolean isReadOnly(EvaluationContext ctx)
throws ELException {
return true;
}
public void setValue(EvaluationContext ctx, Object value)
throws ELException {
throw new PropertyNotWritableException(MessageFactory.get("error.syntax.set"));
}
public void accept(NodeVisitor visitor) throws ELException {
visitor.visit(this);
if (this.children != null && this.children.length > 0) {
for (int i = 0; i < this.children.length; i++) {
this.children[i].accept(visitor);
}
}
}
public Object invoke(EvaluationContext ctx, Class[] paramTypes, Object[] paramValues) throws ELException {
throw new UnsupportedOperationException();
}
public MethodInfo getMethodInfo(EvaluationContext ctx, Class[] paramTypes) throws ELException {
throw new UnsupportedOperationException();
}
@Override
public boolean equals(Object node) {
if (! (node instanceof SimpleNode)) {
return false;
}
SimpleNode n = (SimpleNode) node;
if (this.id != n.id) {
return false;
}
if (this.children == null && n.children == null) {
if (this.image == null) {
return n.image == null;
}
return this.image.equals(n.image);
}
if (this.children == null || n.children == null) {
// One is null and the other is non-null
return false;
}
if (this.children.length != n.children.length) {
return false;
}
if (this.children.length == 0) {
if (this.image == null) {
return n.image == null;
}
return this.image.equals(n.image);
}
for (int i = 0; i < this.children.length; i++) {
if (! this.children[i].equals(n.children[i])) {
return false;
}
}
return true;
}
@Override
public int hashCode() {
if (this.children == null || this.children.length == 0) {
if (this.image != null) {
return this.image.hashCode();
}
return this.id;
}
int h = 0;
for (int i = this.children.length - 1; i >=0; i--) {
h = h + h + h + this.children[i].hashCode();
}
h = h + h + h + id;
return h;
}
}
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