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package com.ctc.wstx.util;
import javax.xml.stream.Location;
import com.ctc.wstx.cfg.ErrorConsts;
/**
* Simple container Object used to store information about id attribute
* values, and references to such (as of yet undefined) values.
*
* Instances can be in one of 2 modes: either in fully defined mode,
* in which case information refers to location where value was defined
* (ie. we had id as a value of ID type attribute); or in undefined mode,
* in which case information refers to the first reference.
*
* Note: this class is designed to be used with {@link ElementIdMap},
* and as a result has some information specifically needed by the
* map implementation (such as collision links).
*/
public final class ElementId
{
/**
* Flag that indicates whether this Object presents a defined id
* value (value of an ID attribute) or just a reference to one.
*/
private boolean mDefined;
/*
/////////////////////////////////////////////////
// Information about id value or value reference,
// depending on mDefined flag
/////////////////////////////////////////////////
*/
/**
* Actual id value
*/
private final String mIdValue;
/**
* Location of either definition (if {@link #mDefined} is true; or
* first reference (otherwise). Used when reporting errors; either
* a referenced id has not been defined, or there are multiple
* definitions of same id.
*/
private Location mLocation;
/**
* Name of element for which this id refers.
*/
private PrefixedName mElemName;
/**
* Name of the attribute that contains this id value (often "id",
* but need not be)
*/
private PrefixedName mAttrName;
/*
////////////////////////////////////////////////////
// Linking information, needed by the map to keep
// track of collided ids, as well as undefined ids
////////////////////////////////////////////////////
*/
private ElementId mNextUndefined;
/**
* Pointer to the next element within collision chain.
*/
private ElementId mNextColl;
/*
/////////////////////////////////////////////////
// Life cycle
/////////////////////////////////////////////////
*/
ElementId(String id, Location loc, boolean defined,
PrefixedName elemName, PrefixedName attrName)
{
mIdValue = id;
mLocation = loc;
mDefined = defined;
mElemName = elemName;
mAttrName = attrName;
}
protected void linkUndefined(ElementId undefined)
{
if (mNextUndefined != null) {
throw new IllegalStateException("ElementId '"+this+"' already had net undefined set ('"+mNextUndefined+"')");
}
mNextUndefined = undefined;
}
protected void setNextColliding(ElementId nextColl)
{
// May add/remove link, no point in checking
mNextColl = nextColl;
}
/*
/////////////////////////////////////////////////
// Public API
/////////////////////////////////////////////////
*/
public String getId() { return mIdValue; }
public Location getLocation() { return mLocation; }
public PrefixedName getElemName() { return mElemName; }
public PrefixedName getAttrName() { return mAttrName; }
public boolean isDefined() { return mDefined; }
public boolean idMatches(char[] buf, int start, int len)
{
if (mIdValue.length() != len) {
return false;
}
// Assumes it's always at least one char long
if (buf[start] != mIdValue.charAt(0)) {
return false;
}
int i = 1;
len += start;
while (++start < len) {
if (buf[start] != mIdValue.charAt(i)) {
return false;
}
++i;
}
return true;
}
public boolean idMatches(String idStr)
{
return mIdValue.equals(idStr);
}
public ElementId nextUndefined() { return mNextUndefined; }
public ElementId nextColliding() { return mNextColl; }
public void markDefined(Location defLoc) {
if (mDefined) { // sanity check
throw new IllegalStateException(ErrorConsts.ERR_INTERNAL);
}
mDefined = true;
mLocation = defLoc;
}
/*
/////////////////////////////////////////////////
// Other methods
/////////////////////////////////////////////////
*/
public String toString() {
return mIdValue;
}
}