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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.pkix.jcajce;

import java.security.cert.PolicyNode;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

public class PKIXPolicyNode
    implements PolicyNode
{
    protected List       children;
    protected int        depth;
    protected Set        expectedPolicies;
    protected PolicyNode parent;
    protected Set        policyQualifiers;
    protected String     validPolicy;
    protected boolean    critical;
    
    /*  
     *  
     *  CONSTRUCTORS
     *  
     */ 
    
    public PKIXPolicyNode(
        List       _children,
        int        _depth,
        Set        _expectedPolicies,
        PolicyNode _parent,
        Set        _policyQualifiers,
        String     _validPolicy,
        boolean    _critical)
    {
        children         = _children;
        depth            = _depth;
        expectedPolicies = _expectedPolicies;
        parent           = _parent;
        policyQualifiers = _policyQualifiers;
        validPolicy      = _validPolicy;
        critical         = _critical;
    }
    
    public void addChild(
        PKIXPolicyNode _child)
    {
        children.add(_child);
        _child.setParent(this);
    }
    
    public Iterator getChildren()
    {
        return children.iterator();
    }
    
    public int getDepth()
    {
        return depth;
    }
    
    public Set getExpectedPolicies()
    {
        return expectedPolicies;
    }
    
    public PolicyNode getParent()
    {
        return parent;
    }
    
    public Set getPolicyQualifiers()
    {
        return policyQualifiers;
    }
    
    public String getValidPolicy()
    {
        return validPolicy;
    }
    
    public boolean hasChildren()
    {
        return !children.isEmpty();
    }
    
    public boolean isCritical()
    {
        return critical;
    }
    
    public void removeChild(PKIXPolicyNode _child)
    {
        children.remove(_child);
    }
    
    public void setCritical(boolean _critical)
    {
        critical = _critical;
    }
    
    public void setParent(PKIXPolicyNode _parent)
    {
        parent = _parent;
    }
    
    public String toString()
    {
        return toString("");
    }
    
    public String toString(String _indent)
    {
        StringBuffer _buf = new StringBuffer();
        _buf.append(_indent);
        _buf.append(validPolicy);
        _buf.append(" {\n");
        
        for(int i = 0; i < children.size(); i++)
        {
            _buf.append(((PKIXPolicyNode)children.get(i)).toString(_indent + "    "));
        }
        
        _buf.append(_indent);
        _buf.append("}\n");
        return _buf.toString();
    }
    
    public Object clone()
    {
        return copy();
    }
    
    public PKIXPolicyNode copy()
    {
        Set     _expectedPolicies = new HashSet();
        Iterator _iter = expectedPolicies.iterator();
        while (_iter.hasNext())
        {
            _expectedPolicies.add(new String((String)_iter.next()));
        }
        
        Set     _policyQualifiers = new HashSet();
        _iter = policyQualifiers.iterator();
        while (_iter.hasNext())
        {
            _policyQualifiers.add(new String((String)_iter.next()));
        }
        
        PKIXPolicyNode _node = new PKIXPolicyNode(new ArrayList(),
                                                  depth,
                                                  _expectedPolicies,
                                                  null,
                                                  _policyQualifiers,
                                                  new String(validPolicy),
                                                  critical);
        
        _iter = children.iterator();
        while (_iter.hasNext())
        {
            PKIXPolicyNode _child = ((PKIXPolicyNode)_iter.next()).copy();
            _child.setParent(_node);
            _node.addChild(_child);
        }
        
        return _node;
    }

    public void setExpectedPolicies(Set expectedPolicies)
    {
        this.expectedPolicies = expectedPolicies;
    }
}