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## jif.lang
Class LabelUtil

    java.lang.Object
      jif.lang.LabelUtil

    public class LabelUtil

extends java.lang.Object

A Label is the runtime representation of a Jif label. A Label consists of a set of components, each of which is a `Policy`.

Field Summary
`static boolean` | `COUNT_TIME`
`protected static LabelUtil` | `singleton`
`static boolean` | `USE_CACHING`

Constructor Summary
`protected` | `LabelUtil()`

Method Summary
`ConfPolicy` | `bottomConf()`
`boolean` | `equivalentTo(Label l1, Label l2)`
`int` | `getAndClearCount()`
`long` | `getAndClearTime()`
`int` | `getAndClearTopCount()`
`int` | `hashCode(Label lb)`
`boolean` | `isReadableBy(Label lbl, Principal p)`
`ConfPolicy` | `join(ConfPolicy p1, ConfPolicy p2)`
`protected ConfPolicy` | `join(ConfPolicy p1, ConfPolicy p2, java.util.Set<jif.lang.PrincipalUtil.DelegationPair> s)`
`IntegPolicy` | `join(IntegPolicy p1, IntegPolicy p2)`
`Label` | `join(Label l1, Label l2)`
`protected ConfPolicy` | `meet(ConfPolicy p1, ConfPolicy p2, java.util.Set<jif.lang.PrincipalUtil.DelegationPair> s)`
`Label` | `meet(Label l1, Label l2)`
`Label` | `meetLbl(Label l1, Label l2)`
`ConfPolicy` | `meetPol(ConfPolicy p1, ConfPolicy p2)`
`IntegPolicy` | `meetPol(IntegPolicy p1, IntegPolicy p2)`
`Label` | `noComponents()`
`ConfPolicy` | `readerPolicy(Label lbl, Principal owner, Principal[] readers)` See the Jif signature for the explanation of lbl.
`ConfPolicy` | `readerPolicy(Principal owner, java.util.Collection<Principal> readers)`
`ConfPolicy` | `readerPolicy(Principal owner, Principal reader)`
`ConfPolicy` | `readerPolicy(Principal owner, PrincipalSet writers)`
`Label` | `readerPolicyLabel(Label lbl, Principal owner, Principal[] readers)` See the Jif signature for the explanation of lbl.
`Label` | `readerPolicyLabel(Principal owner, java.util.Collection<Principal> readers)`
`Label` | `readerPolicyLabel(Principal owner, Principal reader)`
`Label` | `readerPolicyLabel(Principal owner, PrincipalSet readers)`
`boolean` | `relabelsTo(Label from, Label to)`
`boolean` | `relabelsTo(Policy from, Policy to)`
`boolean` | `relabelsTo(Policy from, Policy to, java.util.Set<jif.lang.PrincipalUtil.DelegationPair> s)`
`static LabelUtil` | `singleton()`
`java.lang.String` | `stringValue(Label lb)`
`Label` | `toLabel(ConfPolicy policy)`
`Label` | `toLabel(ConfPolicy cPolicy, IntegPolicy iPolicy)`
`Label` | `toLabel(IntegPolicy policy)`
`IntegPolicy` | `topInteg()`
`java.lang.String` | `toString(Label lb)`
`IntegPolicy` | `writerPolicy(Label lbl, Principal owner, Principal[] writers)` See the Jif signature for the explanation of lbl.
`IntegPolicy` | `writerPolicy(Principal owner, java.util.Collection<Principal> writers)`
`IntegPolicy` | `writerPolicy(Principal owner, Principal writer)`
`IntegPolicy` | `writerPolicy(Principal owner, PrincipalSet writers)`
`Label` | `writerPolicyLabel(Label lbl, Principal owner, Principal[] writers)` See the Jif signature for the explanation of lbl.
`Label` | `writerPolicyLabel(Principal owner, java.util.Collection<Principal> writers)`
`Label` | `writerPolicyLabel(Principal owner, Principal writer)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### singleton

    protected static LabelUtil singleton

### COUNT_TIME

    public static final boolean COUNT_TIME

See Also:
  Constant Field Values

### USE_CACHING

    public static final boolean USE_CACHING

See Also:
  Constant Field Values

Constructor Detail

### LabelUtil

    protected LabelUtil()

Method Detail

### singleton

    public static LabelUtil singleton()

### getAndClearTime

    public long getAndClearTime()

### getAndClearCount

    public int getAndClearCount()

### getAndClearTopCount

    public int getAndClearTopCount()

### noComponents

    public Label noComponents()

### bottomConf

    public ConfPolicy bottomConf()

### topInteg

    public IntegPolicy topInteg()

### readerPolicy

    public ConfPolicy readerPolicy(Principal owner,
                                   Principal reader)

### readerPolicy

    public ConfPolicy readerPolicy(Principal owner,
                                   java.util.Collection<Principal> readers)

### readerPolicy

    public ConfPolicy readerPolicy(Label lbl,
                                   Principal owner,
                                   Principal[] readers)

  See the Jif signature for the explanation of lbl.

### readerPolicy

    public ConfPolicy readerPolicy(Principal owner,
                                   PrincipalSet writers)

### readerPolicyLabel

    public Label readerPolicyLabel(Principal owner,
                                   Principal reader)

### readerPolicyLabel

    public Label readerPolicyLabel(Principal owner,
                                   java.util.Collection<Principal> readers)

### readerPolicyLabel

    public Label readerPolicyLabel(Label lbl,
                                   Principal owner,
                                   Principal[] readers)

  See the Jif signature for the explanation of lbl.

### readerPolicyLabel

    public Label readerPolicyLabel(Principal owner,
                                   PrincipalSet readers)

### writerPolicy

    public IntegPolicy writerPolicy(Principal owner,
                                    Principal writer)

### writerPolicy

    public IntegPolicy writerPolicy(Principal owner,
                                    java.util.Collection<Principal> writers)

### writerPolicyLabel

    public Label writerPolicyLabel(Principal owner,
                                   Principal writer)

### writerPolicyLabel

    public Label writerPolicyLabel(Principal owner,
                                   java.util.Collection<Principal> writers)

### writerPolicyLabel

    public Label writerPolicyLabel(Label lbl,
                                   Principal owner,
                                   Principal[] writers)

  See the Jif signature for the explanation of lbl.

### writerPolicy

    public IntegPolicy writerPolicy(Label lbl,
                                    Principal owner,
                                    Principal[] writers)

  See the Jif signature for the explanation of lbl.

### writerPolicy

    public IntegPolicy writerPolicy(Principal owner,
                                    PrincipalSet writers)

### toLabel

    public Label toLabel(ConfPolicy cPolicy,
                         IntegPolicy iPolicy)

### toLabel

    public Label toLabel(ConfPolicy policy)

### toLabel

    public Label toLabel(IntegPolicy policy)

### join

    public Label join(Label l1,
                      Label l2)

### meetLbl

    public Label meetLbl(Label l1,
                         Label l2)

### meet

    public Label meet(Label l1,
                      Label l2)

### join

    public ConfPolicy join(ConfPolicy p1,
                           ConfPolicy p2)

### join

    protected ConfPolicy join(ConfPolicy p1,
                              ConfPolicy p2,
                              java.util.Set<jif.lang.PrincipalUtil.DelegationPair> s)

### join

    public IntegPolicy join(IntegPolicy p1,
                            IntegPolicy p2)

### meetPol

    public ConfPolicy meetPol(ConfPolicy p1,
                              ConfPolicy p2)

### meet

    protected ConfPolicy meet(ConfPolicy p1,
                              ConfPolicy p2,
                              java.util.Set<jif.lang.PrincipalUtil.DelegationPair> s)

### meetPol

    public IntegPolicy meetPol(IntegPolicy p1,
                               IntegPolicy p2)

### equivalentTo

    public boolean equivalentTo(Label l1,
                                Label l2)

### isReadableBy

    public boolean isReadableBy(Label lbl,
                                Principal p)

### relabelsTo

    public boolean relabelsTo(Label from,
                              Label to)

### relabelsTo

    public boolean relabelsTo(Policy from,
                              Policy to)

### relabelsTo

    public boolean relabelsTo(Policy from,
                              Policy to,
                              java.util.Set<jif.lang.PrincipalUtil.DelegationPair> s)

### stringValue

    public java.lang.String stringValue(Label lb)

### toString

    public java.lang.String toString(Label lb)

### hashCode

    public int hashCode(Label lb)

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