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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 * 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
 *
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/*
 * $Id: FlowList.java,v 1.10 2010-11-01 04:34:16 joehw Exp $
 */
package com.sun.org.apache.xalan.internal.xsltc.compiler;

import java.util.Iterator;
import java.util.Vector;

import com.sun.org.apache.bcel.internal.generic.BranchHandle;
import com.sun.org.apache.bcel.internal.generic.InstructionHandle;
import com.sun.org.apache.bcel.internal.generic.InstructionList;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
public final class FlowList {
    private Vector _elements;

    public FlowList() {
	_elements = null;
    }

    public FlowList(InstructionHandle bh) {
	_elements = new Vector();
	_elements.addElement(bh);
    }

    public FlowList(FlowList list) {
	_elements = list._elements;
    }

    public FlowList add(InstructionHandle bh) {
	if (_elements == null) {
	    _elements = new Vector();
	}
	_elements.addElement(bh);
	return this;
    }

    public FlowList append(FlowList right) {
	if (_elements == null) {
	    _elements = right._elements;
	}
	else {
	    final Vector temp = right._elements;
	    if (temp != null) {
		final int n = temp.size();
		for (int i = 0; i < n; i++) {
		    _elements.addElement(temp.elementAt(i));
		}
	    }
	}
	return this;
    }

    /**
     * Back patch a flow list. All instruction handles must be branch handles.
     */
    public void backPatch(InstructionHandle target) {
	if (_elements != null) {
	    final int n = _elements.size();
	    for (int i = 0; i < n; i++) {
		BranchHandle bh = (BranchHandle)_elements.elementAt(i);
		bh.setTarget(target);
	    }
	    _elements.clear();		// avoid backpatching more than once
	}
    }

    /**
     * Redirect the handles from oldList to newList. "This" flow list
     * is assumed to be relative to oldList.
     */
    public FlowList copyAndRedirect(InstructionList oldList, 
	InstructionList newList) 
    {
	final FlowList result = new FlowList();
	if (_elements == null) {
	    return result;
	}

	final int n = _elements.size();
	final Iterator oldIter = oldList.iterator();
	final Iterator newIter = newList.iterator();
	
	while (oldIter.hasNext()) {
	    final InstructionHandle oldIh = (InstructionHandle) oldIter.next();
	    final InstructionHandle newIh = (InstructionHandle) newIter.next();

	    for (int i = 0; i < n; i++) {
		if (_elements.elementAt(i) == oldIh) {
		    result.add(newIh);
		}
	    }
	}
	return result;
    }
}