/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.relaxng.pattern;
import com.caucho.relaxng.RelaxException;
import com.caucho.relaxng.program.InterleaveItem;
import com.caucho.relaxng.program.Item;
import com.caucho.util.CharBuffer;
import java.util.ArrayList;
/**
* Relax element pattern
*/
public class InterleavePattern extends Pattern {
private ArrayList<Pattern> _patterns = new ArrayList<Pattern>();
private Item _item;
/**
* Creates a new interleave pattern.
*/
public InterleavePattern()
{
}
/**
* Returns the Relax schema name.
*/
public String getTagName()
{
return "interleave";
}
/**
* Returns the number of children.
*/
public int getSize()
{
return _patterns.size();
}
/**
* Returns the n-th child.
*/
public Pattern getChild(int i)
{
return _patterns.get(i);
}
/**
* Returns true if it contains a data element.
*/
public boolean hasData()
{
for (int i = 0; i < _patterns.size(); i++) {
if (_patterns.get(i).hasData())
return true;
}
return false;
}
/**
* Returns true if it contains a data element.
*/
public boolean hasElement()
{
for (int i = 0; i < _patterns.size(); i++) {
if (_patterns.get(i).hasElement())
return true;
}
return false;
}
/**
* Adds an element.
*/
public void addChild(Pattern child)
throws RelaxException
{
if (child instanceof DataPattern)
throw new RelaxException(L.l("<data> or <string> may not be used with interleave. Use <text> instead."));
if (child instanceof EmptyPattern)
throw new RelaxException(L.l("<empty> is not allowed as a child of <interleave>"));
child.setParent(this);
child.setElementName(getElementName());
if (child instanceof InterleavePattern) {
InterleavePattern interleave = (InterleavePattern) child;
for (int i = 0; i < interleave.getSize(); i++)
addChild(interleave.getChild(i));
return;
}
if (_patterns.contains(child))
return;
_patterns.add(child);
}
/**
* Creates the production item.
*/
public Item createItem(GrammarPattern grammar)
throws RelaxException
{
if (_item == null) {
InterleaveItem item = new InterleaveItem();
for (int i = 0; i < _patterns.size(); i++) {
item.addItem(_patterns.get(i).createItem(grammar));
}
_item = item.getMin();
}
return _item;
}
/**
* Returns a string for the production.
*/
public String toProduction()
{
CharBuffer cb = new CharBuffer();
for (int i = 0; i < _patterns.size(); i++) {
if (i != 0)
cb.append(" & ");
cb.append(_patterns.get(i).toProduction());
}
return cb.toString();
}
public boolean equals(Object o)
{
if (this == o)
return true;
if (! (o instanceof InterleavePattern))
return false;
InterleavePattern interleave = (InterleavePattern) o;
if (_patterns.size() != interleave._patterns.size())
return false;
return isSubset(interleave) && interleave.isSubset(this);
}
private boolean isSubset(InterleavePattern item)
{
if (_patterns.size() != item._patterns.size())
return false;
for (int i = 0; i < _patterns.size(); i++) {
Pattern subPattern = _patterns.get(i);
if (! item._patterns.contains(subPattern))
return false;
}
return true;
}
/**
* Debugging.
*/
public String toString()
{
return "InterleavePattern" + _patterns;
}
}