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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2013 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.expr.instruct;

import net.sf.saxon.Configuration;
import net.sf.saxon.Controller;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.*;
import net.sf.saxon.trans.SaxonErrorCode;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.SequenceExtent;
import net.sf.saxon.value.SequenceType;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.*;


/**
* The Bindery class holds information about variables and their values. From Saxon 8.1, it is
* used only for global variables: local variables are now held in the XPathContext object.
*
* Variables are identified by a Binding object. Values will always be of class Value.
*/

public final class Bindery  {

    private Sequence[] globals;          // values of global variables and parameters
    private long[] busy;                            // set to current thread id while variable is being evaluated
    private GlobalParameterSet globalParameters;    // supplied global parameters
    private SlotManager globalVariableMap;          // contains the mapping of variable names to slot numbers
    private Map> dependencies =
            new HashMap>();
    private boolean applyConversionRules = true;

    /**
     * Define how many slots are needed for global variables
     * @param map the SlotManager that keeps track of slot allocation for global variables.
    */

    public void allocateGlobals(SlotManager map) {
        globalVariableMap = map;
        int n = map.getNumberOfVariables()+1;
        globals = new Sequence[n];
        busy = new long[n];
        for (int i=0; i transitiveDependencies = dependencies.get(two);
        if (transitiveDependencies != null) {
            if (transitiveDependencies.contains(one)) {
                throw new XPathException.Circularity("Circular dependency among variables: "
                        + one.getVariableQName().getDisplayName() + " depends on the value of "
                        + two.getVariableQName().getDisplayName() + ", which depends directly or indirectly on the value of "
                        + one.getVariableQName().getDisplayName());
            }
            for (GlobalVariable var : transitiveDependencies) {
                // register the transitive dependencies
                registerDependency(one, var);
            }
        }
        Set existingDependencies = dependencies.get(one);
        if (existingDependencies == null) {
            existingDependencies = new HashSet();
            dependencies.put(one, existingDependencies);
        }
        existingDependencies.add(two);

    }

}