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package org.rosuda.REngine;
/** Represents a pairlist in R. Unlike the actual internal R implementation this one
does not use CAR/CDR/TAG linked representation but a @link{RList} object. */
public class REXPList extends REXPVector {
private RList payload;
/* create a new pairlist with the contents of a named R list and no attributes.
@param list named list with the contents */
public REXPList(RList list) {
super();
payload=(list==null)?new RList():list;
}
/* create a new pairlist with the contents of a named R list and attributes.
@param list named list with the contents
@param attr attributes */
public REXPList(RList list, REXPList attr) {
super(attr);
payload=(list==null)?new RList():list;
}
/* create a pairlist containing just one pair comprising of one value and one name.
This is a convenience constructor most commonly used to create attribute pairlists.
@param value of the element in the pairlist (must not be <code>null</code>)
@param name of the element in the pairlist (must not be <code>null</code>) */
public REXPList(REXP value, String name) {
super();
payload = new RList(new REXP[] { value }, new String[] { name });
}
public Object asNativeJavaObject() throws REXPMismatchException {
// since REXPGenericVector does the hard work, we just cheat and use it in turn
REXPGenericVector v = new REXPGenericVector(payload);
return v.asNativeJavaObject();
}
public int length() { return payload.size(); }
public boolean isList() { return true; }
public boolean isPairList() { return true; }
public boolean isRecursive() { return true; }
public RList asList() { return payload; }
public String toString() {
return super.toString()+(asList().isNamed()?"named":"");
}
public String toDebugString() {
StringBuffer sb = new StringBuffer(super.toDebugString()+"{");
int i = 0;
while (i < payload.size() && i < maxDebugItems) {
if (i>0) sb.append(",\n");
String name = payload.keyAt(i);
if (name!=null) sb.append(name+"=");
sb.append(payload.at(i).toDebugString());
i++;
}
if (i < payload.size()) sb.append(",..");
return sb.toString()+"}";
}
}
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