Java Var.hasValue方法代码示例

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
/**
 * Clone the specified variable and attach bindings, moreover change name of variable
 * by appending "_varId" to it.
 * 
 * @param sb
 * @param var
 * @param varNames
 * @param bindings
 * 
 * @return
 */
protected static Var appendVarId(Var var, String varID, Set<String> varNames, BindingSet bindings) {
	Var res = var.clone();
	if (!var.hasValue()) {
		if (bindings.hasBinding(var.getName())) {
			res.setValue( bindings.getValue(var.getName()) );
		} else {
			String newName = var.getName() + "_" + varID;
			varNames.add(newName);
			res.setName(newName);
		}			
	}
	return res;
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
protected static void append(Var var, StringBuilder sb) {
	if (var.hasValue()) {
		appendValue(sb, var.getValue());
	} else {
		sb.append("?").append(var.getName());
	}
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
protected static Value toValue(Var var, BindingSet bindings) {
	if (var.hasValue())
		return var.getValue();
	
	if (bindings.hasBinding(var.getName()))	
		return bindings.getValue(var.getName());
	
	return null;			
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
/**
 * Gets a value from a {@code Var} if it has a {@code Value}. If it does not then the method will attempt to get it 
 * from the bindings using the name of the Var
 * @param var
 * @param bindings
 * @return the matching {@code Value} or {@code null} if var is {@code null}
 */
private static Value getVarValue(Var var, BindingSet bindings) {
    if (var == null) {
        return null;
    } else if (var.hasValue()) {
        return var.getValue();
    } else {
        return bindings.getValue(var.getName());
    }
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
/**
 * @inheritDoc
 */
@Override
public void meet(Var theVar)
        throws Exception
{
    if (theVar.isAnonymous() && !theVar.hasValue()) {
        mBuffer.append("?").append(BaseTupleExprRenderer.scrubVarName(theVar.getName()));
    }
    else if (theVar.hasValue()) {
        mBuffer.append(SPARQLQueryStringUtil.toSPARQL(theVar.getValue()));
    }
    else {
        mBuffer.append("?").append(theVar.getName());
    }
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
private void ctxOpen(TupleExpr theExpr) {
    Var aContext = mContexts.get(theExpr);

    if (aContext != null) {
        mJoinBuffer.append(indent()).append("GRAPH ");
        if (aContext.hasValue()) {
            mJoinBuffer.append(SPARQLQueryStringUtil.toSPARQL(aContext.getValue()));
        }
        else {
            mJoinBuffer.append("?").append(aContext.getName());
        }
        mJoinBuffer.append(" {\n");
        mIndent += 2;
    }
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
private Var transformVar(Var v, EquivalentIRI uri) {
    if (!v.hasValue())
        return v;
    else {
        Var v1 = new Var("const-" + uri.getTargetURI().toString(), uri.getTargetURI());
        v1.setConstant(true);
        return v1;
    }
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
public static String toString(Var var) {
	if (!var.hasValue())
		return "?" + var.getName();
	return getValueString(var.getValue());
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
/**
 * returns true iff there is at least one free variable, i.e. there is no binding
 * for any variable
 * 
 * @param stmt
 * @param bindings
 * @return
 */
public static boolean hasFreeVars(StatementPattern stmt, BindingSet bindings) {
	for (Var var : stmt.getVarList()) {
		if(!var.hasValue() && !bindings.hasBinding(var.getName()))
			return true;	// there is at least one free var				
	}
	return false;
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
/**
 * Append the variable to the provided StringBuilder.
 * 
 * Cases:
 *  1) unbound: check provided bindingset for possible match 
 *   a) match found: append matching value
 *   b) no match: append ?varName and add to varNames
 *  2) bound: append value
 *  
 * @param sb
 * @param var
 * @param varNames
 * @param bindings
 * 
 * @return
 * 		the stringbuilder
 */
protected static StringBuilder appendVar(StringBuilder sb, Var var, Set<String> varNames, BindingSet bindings) {
	if (!var.hasValue()) {
		if (bindings.hasBinding(var.getName()))
			return appendValue(sb, bindings.getValue(var.getName()));
		varNames.add(var.getName());
		return sb.append("?").append(var.getName());
	}
	else
		return appendValue(sb, var.getValue());
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
/**
 * Append the variable to the provided StringBuilder, however change name of variable
 * by appending "_varId" to it.
 * 
 * Cases:
 *  1) unbound: check provided bindingset for possible match 
 *   a) match found: append matching value
 *   b) no match: append ?varName_varId and add to varNames
 *  2) bound: append value
 *  
 * @param sb
 * @param var
 * @param varNames
 * @param bindings
 * 
 * @return
 * 		the complemented string builder
 */
protected static StringBuilder appendVarId(StringBuilder sb, Var var, String varID, Set<String> varNames, BindingSet bindings) {
	if (!var.hasValue()) {
		if (bindings.hasBinding(var.getName()))
			return appendValue(sb, bindings.getValue(var.getName()));
		String newName = var.getName() + "_" + varID;
		varNames.add(newName);
		return sb.append("?").append(newName);
	}
	else
		return appendValue(sb, var.getValue());
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
/**
 * Return the {@link Value} of the variable which is either taken from
 * the variable itself (bound) or from the bindingsset (unbound).
 * 
 * @param var
 * @param bindings
 * 			the bindings, must not be null, use {@link EmptyBindingSet} instead
 * 
 * @return
 * 		the value or null
 */
public static Value getVarValue(Var var, BindingSet bindings) {
	if (var == null) {
		return null;
	} else if (var.hasValue()) {
		return var.getValue();
	} else {
		return bindings.getValue(var.getName());
	}
}
 

import org.eclipse.rdf4j.query.algebra.Var; //导入方法依赖的package包/类
/**
 * Clone the specified variable and attach bindings.
 *  
 * @param sb
 * @param var
 * @param varNames
 * @param bindings
 * 
 * @return

 */
protected static Var appendVar(Var var, Set<String> varNames, BindingSet bindings) {
	Var res = var.clone();
	if (!var.hasValue()) {
		if (bindings.hasBinding(var.getName()))
			res.setValue( bindings.getValue(var.getName()) );
		else 
			varNames.add(var.getName());			
	}
	return res;
}