import java.util.*;
public class TaskQueueIterator {
- TaskQueue tq;
- int index;
- FlagTagState fts;
- FlagTagState ftsarray[];
- Hashtable<TempDescriptor, TagState> tsarray;
- Hashtable<TempDescriptor, Integer> tsindexarray;
- Iterator<FlagTagState> itarray[];
- boolean needit;
- boolean needinit;
+ TaskQueue tq;
+ int index;
+ FlagTagState fts;
+ FlagTagState ftsarray[];
+ Hashtable<TempDescriptor, TagState> tsarray;
+ Hashtable<TempDescriptor, Integer> tsindexarray;
+ Iterator<FlagTagState> itarray[];
+ boolean needit;
+ boolean needinit;
- public TaskQueueIterator(TaskQueue tq, int index, FlagTagState fts) {
- this.tq=tq;
- this.index=index;
- this.fts=fts;
- this.ftsarray=new FlagTagState[tq.numParameters()];
- this.ftsarray[index]=fts;
- this.tsarray=new Hashtable<TempDescriptor, TagState>();
- this.tsindexarray=new Hashtable<TempDescriptor, Integer>();
- this.itarray=(Iterator<FlagTagState>[]) new Iterator[tq.numParameters()];
- needit=false;
- needinit=true;
- init();
- }
-
- private void init() {
- for(int i=ftsarray.length-1;i>=0;i--) {
- if (i!=index)
- itarray[i]=tq.parameterset[i].iterator();
- VarDescriptor vd=tq.task.getParameter(i);
- TagExpressionList tel=tq.task.getTag(vd);
- if (tel!=null)
- for(int j=0;j<tel.numTags();j++) {
- TempDescriptor tmp=tel.getTemp(j);
- if (!tsindexarray.containsKey(tmp)) {
- tsindexarray.put(tmp, new Integer(i));
- }
- }
+ public TaskQueueIterator(TaskQueue tq, int index, FlagTagState fts) {
+ this.tq=tq;
+ this.index=index;
+ this.fts=fts;
+ this.ftsarray=new FlagTagState[tq.numParameters()];
+ this.ftsarray[index]=fts;
+ this.tsarray=new Hashtable<TempDescriptor, TagState>();
+ this.tsindexarray=new Hashtable<TempDescriptor, Integer>();
+ this.itarray=(Iterator<FlagTagState>[]) new Iterator[tq.numParameters()];
+ needit=false;
+ needinit=true;
+ init();
+ }
+
+ private void init() {
+ for(int i=ftsarray.length-1; i>=0; i--) {
+ if (i!=index)
+ itarray[i]=tq.parameterset[i].iterator();
+ VarDescriptor vd=tq.task.getParameter(i);
+ TagExpressionList tel=tq.task.getTag(vd);
+ if (tel!=null)
+ for(int j=0; j<tel.numTags(); j++) {
+ TempDescriptor tmp=tel.getTemp(j);
+ if (!tsindexarray.containsKey(tmp)) {
+ tsindexarray.put(tmp, new Integer(i));
+ }
}
}
+ }
- public boolean hasNext() {
- TaskDescriptor td=tq.task;
- int i;
- if (needinit) {
- i=ftsarray.length-1;
- if (i!=index)
- ftsarray[i]=itarray[i].next();
- } else {
- i=0;
- }
+ public boolean hasNext() {
+ TaskDescriptor td=tq.task;
+ int i;
+ if (needinit) {
+ i=ftsarray.length-1;
+ if (i!=index)
+ ftsarray[i]=itarray[i].next();
+ } else {
+ i=0;
+ }
- if (i==0&&index==0&&ftsarray[0]!=null&&!needit) {
- needinit=false;
- return true;
- }
+ if (i==0&&index==0&&ftsarray[0]!=null&&!needit) {
+ needinit=false;
+ return true;
+ }
- objloop:
- for(;i<ftsarray.length;i++) {
- FlagState currfs=ftsarray[i].fs;
- VarDescriptor vd=td.getParameter(i);
- TagExpressionList tel=td.getTag(vd);
- int j;
- if (needinit) {
- j=(tel!=null)&&tel.numTags()>0?tel.numTags()-1:0;
- needinit=false;
- } else
- j=0;
- tagloop:
- for(;tel!=null&&j<tel.numTags();j++) {
- TempDescriptor tmp=tel.getTemp(j);
- TagState currtag=tsarray.get(tmp);
- String type=tel.getType(j);
-
- if (tsindexarray.get(tmp).intValue()==i) {
- //doing the assignment right here!!!
- Vector<FlagTagState> possts=tq.map.get(currfs);
- int index=0;
- if (currtag!=null)
- index=possts.indexOf(new FlagTagState(currtag,currfs));
- if (needit) {
- index++;
- needit=false;
- }
- for(int k=index;k<possts.size();k++) {
- FlagTagState posstag=possts.get(k);
- if (posstag.ts.getTag().getSymbol().equals(type)) {
- tsarray.put(tmp, posstag.ts);
- if (j==0) {
- if (i==0) {
- //We are done!
- return true;
- } else {
- //Backtrack on objects
- i-=2;
- continue objloop;
- }
- } else {
- //Backtrack on tags
- j-=2;
- continue tagloop;
- }
- }
- }
- //couldn't find a tag
- tsarray.put(tmp, null);
- needit=true;
- } else {
- //check tag compatibility
- if (!currtag.containsFS(currfs)) {
- //incompatible tag set by previous level
- //need to increment object state
- needit=true;
- break;
- }
- }
- }
- if (index==i) {
- continue;
- }
- if (needit) {
- if (itarray[i].hasNext()) {
- ftsarray[i]=itarray[i].next();
- needit=false;
- i-=1;
- continue objloop; //backtrack and fix up everything
+objloop:
+ for(; i<ftsarray.length; i++) {
+ FlagState currfs=ftsarray[i].fs;
+ VarDescriptor vd=td.getParameter(i);
+ TagExpressionList tel=td.getTag(vd);
+ int j;
+ if (needinit) {
+ j=(tel!=null)&&tel.numTags()>0 ? tel.numTags()-1 : 0;
+ needinit=false;
+ } else
+ j=0;
+tagloop:
+ for(; tel!=null&&j<tel.numTags(); j++) {
+ TempDescriptor tmp=tel.getTemp(j);
+ TagState currtag=tsarray.get(tmp);
+ String type=tel.getType(j);
+
+ if (tsindexarray.get(tmp).intValue()==i) {
+ //doing the assignment right here!!!
+ Vector<FlagTagState> possts=tq.map.get(currfs);
+ int index=0;
+ if (currtag!=null)
+ index=possts.indexOf(new FlagTagState(currtag,currfs));
+ if (needit) {
+ index++;
+ needit=false;
+ }
+ for(int k=index; k<possts.size(); k++) {
+ FlagTagState posstag=possts.get(k);
+ if (posstag.ts.getTag().getSymbol().equals(type)) {
+ tsarray.put(tmp, posstag.ts);
+ if (j==0) {
+ if (i==0) {
+ //We are done!
+ return true;
} else {
- itarray[i]=tq.parameterset[i].iterator();//keep going backwards
+ //Backtrack on objects
+ i-=2;
+ continue objloop;
}
- } else {
- throw new Error();
+ } else {
+ //Backtrack on tags
+ j-=2;
+ continue tagloop;
+ }
}
+ }
+ //couldn't find a tag
+ tsarray.put(tmp, null);
+ needit=true;
+ } else {
+ //check tag compatibility
+ if (!currtag.containsFS(currfs)) {
+ //incompatible tag set by previous level
+ //need to increment object state
+ needit=true;
+ break;
+ }
+ }
+ }
+ if (index==i) {
+ continue;
+ }
+ if (needit) {
+ if (itarray[i].hasNext()) {
+ ftsarray[i]=itarray[i].next();
+ needit=false;
+ i-=1;
+ continue objloop; //backtrack and fix up everything
+ } else {
+ itarray[i]=tq.parameterset[i].iterator(); //keep going backwards
}
- return false;
+ } else {
+ throw new Error();
+ }
}
+ return false;
+ }
- public FlagTagState getFTS(int index) {
- return ftsarray[index];
- }
+ public FlagTagState getFTS(int index) {
+ return ftsarray[index];
+ }
- public TagState getTS(TempDescriptor tmp) {
- return tsarray.get(tmp);
- }
-
- public void next() {
- needit=true;
- }
+ public TagState getTS(TempDescriptor tmp) {
+ return tsarray.get(tmp);
+ }
+
+ public void next() {
+ needit=true;
+ }
}
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