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PostgreSQL JDBC - NG - Driver
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/**
* Copyright (c) 2013, impossibl.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of impossibl.com nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package com.impossibl.postgres.jdbc;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
public class SQLTextTree {
public interface Processor {
Node process(Node node) throws SQLException;
}
public abstract static class Node {
private int startPos;
private int endPos;
public Node(int startPos, int endPos) {
this.startPos = startPos;
this.endPos = endPos;
}
public Node copy() {
return this;
}
public int getStartPos() {
return startPos;
}
public void setStartPos(int start) {
this.startPos = start;
}
public int getEndPos() {
return endPos;
}
public void setEndPos(int end) {
this.endPos = end;
}
abstract void build(StringBuilder builder);
public Node process(Processor processor, boolean recurse) throws SQLException {
return processor.process(this);
}
void removeAll(final Class nodeType, boolean recurse) {
try {
process(new Processor() {
@Override
public Node process(Node node) throws SQLException {
if (nodeType.isInstance(node))
return null;
return node;
}
}, recurse);
}
catch (SQLException e) {
// Ignore
}
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
build(sb);
return sb.toString();
}
}
public static class CompositeNode extends Node {
protected List nodes = new ArrayList<>();
public CompositeNode(int startPos) {
super(startPos, -1);
}
public CompositeNode(List nodes, int startPos) {
super(startPos, -1);
this.nodes = nodes;
}
@Override
public Node copy() {
CompositeNode clone = new CompositeNode(getStartPos());
copyNodes(clone);
return clone;
}
protected void copyNodes(CompositeNode newNode) {
newNode.nodes = new ArrayList<>(nodes.size());
for (Node node : nodes) {
newNode.nodes.add((Node) node.copy());
}
}
@Override
void build(StringBuilder builder) {
for (Node node : nodes) {
node.build(builder);
}
}
int getNodeCount() {
return nodes.size();
}
Node get(int idx) {
return nodes.get(idx);
}
void set(int idx, Node node) {
nodes.set(idx, node);
}
Iterator iterator() {
return nodes.iterator();
}
List subList(int fromIndex) {
return subList(fromIndex, nodes.size());
}
List subList(int fromIndex, int toIndex) {
return nodes.subList(fromIndex, toIndex);
}
@Override
public Node process(Processor processor, boolean recurse) throws SQLException {
//Process each child node...
ListIterator nodeIter = nodes.listIterator();
while (nodeIter.hasNext()) {
Node res;
if (recurse) {
res = nodeIter.next().process(processor, recurse);
}
else {
res = processor.process(nodeIter.next());
}
if (res != null) {
nodeIter.set(res);
}
else {
nodeIter.remove();
}
}
return processor.process(this);
}
void add(Node node) {
this.nodes.add(node);
}
public boolean containsAll(Class cls) {
for (Node node : nodes) {
if (!cls.isInstance(node))
return false;
}
return true;
}
public void trim() {
if (nodes.isEmpty())
return;
//Prune starting and ending whitespace
if (nodes.get(0) instanceof WhitespacePiece) {
nodes.remove(0);
}
if (nodes.isEmpty()) {
return;
}
if (nodes.get(nodes.size() - 1) instanceof WhitespacePiece) {
nodes.remove(nodes.size() - 1);
}
}
public Node getFirstNode() {
if (nodes.isEmpty())
return null;
return nodes.get(0);
}
public Node getLastNode() {
if (nodes.isEmpty())
return null;
return nodes.get(nodes.size() - 1);
}
}
public static class MultiStatementNode extends CompositeNode {
public MultiStatementNode(int startPos) {
super(startPos);
}
public MultiStatementNode(List nodes, int startPos) {
super(nodes, startPos);
}
@Override
public Node copy() {
MultiStatementNode clone = new MultiStatementNode(getStartPos());
copyNodes(clone);
return clone;
}
@Override
void build(StringBuilder builder) {
Iterator nodeIter = iterator();
while (nodeIter.hasNext()) {
nodeIter.next().build(builder);
if (nodeIter.hasNext())
builder.append(';');
}
}
}
public static class StatementNode extends CompositeNode {
public StatementNode(int startPos) {
super(startPos);
}
@Override
public Node copy() {
StatementNode clone = new StatementNode(getStartPos());
copyNodes(clone);
return clone;
}
}
public static class EscapeNode extends CompositeNode {
public EscapeNode(int startPos) {
super(startPos);
}
@Override
public Node copy() {
EscapeNode clone = new EscapeNode(getStartPos());
copyNodes(clone);
return clone;
}
@Override
void build(StringBuilder builder) {
builder.append('{');
super.build(builder);
builder.append('}');
}
}
public static class ParenGroupNode extends CompositeNode {
public ParenGroupNode(int startPos) {
super(startPos);
}
@Override
public Node copy() {
ParenGroupNode clone = new ParenGroupNode(getStartPos());
copyNodes(clone);
return clone;
}
@Override
void build(StringBuilder builder) {
builder.append('(');
super.build(builder);
builder.append(')');
}
}
public static class PieceNode extends Node {
private String text;
public PieceNode(String val, int startPos) {
super(startPos, startPos + val.length());
this.text = val;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
void coalesce(PieceNode otherPiece) {
setText(getText() + otherPiece.getText());
setEndPos(getStartPos() + getText().length());
}
@Override
void build(StringBuilder builder) {
builder.append(text);
}
@Override
public String toString() {
return text;
}
}
public static class GrammarPiece extends PieceNode {
GrammarPiece(String val, int startPos) {
super(val, startPos);
}
}
public static class ParameterPiece extends PieceNode {
int idx;
ParameterPiece(int idx, int pos) {
super("$" + idx, pos);
this.idx = idx;
}
@Override
public Node copy() {
return new ParameterPiece(idx, getStartPos());
}
public int getIdx() {
return idx;
}
public void setIdx(int idx) {
this.idx = idx;
setText("$" + idx);
}
}
public static class IdentifierPiece extends PieceNode {
public IdentifierPiece(String val, int startPos) {
super(val, startPos);
}
}
public static class UnquotedIdentifierPiece extends IdentifierPiece {
UnquotedIdentifierPiece(String val, int startPos) {
super(val, startPos);
}
}
public static class QuotedIdentifierPiece extends IdentifierPiece {
QuotedIdentifierPiece(String val, int startPos) {
super(val, startPos);
}
@Override
void build(StringBuilder builder) {
builder.append('"');
super.build(builder);
builder.append('"');
}
}
public static class LiteralPiece extends PieceNode {
public LiteralPiece(String val, int startPos) {
super(val, startPos);
}
}
public static class StringLiteralPiece extends LiteralPiece {
String delimeter;
StringLiteralPiece(String val, int startPos) {
super(val, startPos);
this.delimeter = "'";
}
StringLiteralPiece(String val, String delimeter, int startPos) {
super(val, startPos);
this.delimeter = delimeter;
}
@Override
void build(StringBuilder builder) {
builder.append(delimeter);
super.build(builder);
builder.append(delimeter);
}
}
public static class NumericLiteralPiece extends LiteralPiece {
NumericLiteralPiece(String val, int startPos) {
super(val, startPos);
}
}
public static class ReplacementPiece extends PieceNode {
ReplacementPiece(String val, int startPos) {
super(val, startPos);
}
}
public static class CommentPiece extends PieceNode {
CommentPiece(String val, int startPos) {
super(val, startPos);
}
}
public static class WhitespacePiece extends PieceNode {
WhitespacePiece(String val, int startPos) {
super(val, startPos);
}
}
}