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/*
* This file is part of the URI Template library.
*
* For licensing information please see the file license.txt included in the release.
* A copy of this licence can also be found at
* http://www.opensource.org/licenses/artistic-license-2.0.php
*/
package org.weborganic.furi;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* A token using the operators defined in draft 3 of the URI templates specifications.
*
* Characters (4.2):
*
*
* op = 1*ALPHA
* arg = *(reserved / unreserved / pct-encoded)
* var = varname [ "=" vardefault ]
* vars = var [ *("," var) ]
* varname = (ALPHA / DIGIT)*(ALPHA / DIGIT / "." / "_" / "-" )
* vardefault = *(unreserved / pct-encoded)
* operator = "-" op "|" arg "|" vars
*
*
* @see URI
* Template (draft 3)
*
* @author Christophe Lauret
* @version 9 February 2009
*/
public class TokenOperatorD3 extends TokenBase implements TokenOperator {
/**
* The list of operators currently supported.
*/
public enum Operator {
/**
* 4.4.2 The 'opt' operator.
*
* If each variable is undefined or an empty list then substitute the empty string, otherwise
* substitute the value of 'arg'.
*
* Example:
*
*
*/
OPT {
public String expand(String arg, List vars, Parameters parameters) {
for (Variable v : vars) {
if (parameters.exists(v.name()))
return arg;
}
return "";
}
},
/**
* 4.4.3 The 'neg' operator.
*
* If each variable is undefined or an empty list then substitute the value of arg, otherwise
* substitute the empty string.
*
* Example:
*
*
*/
NEG {
String expand(String arg, List vars, Parameters parameters) {
for (Variable v : vars) {
if (parameters.exists(v.name()))
return "";
}
return arg;
}
},
/**
* 4.4.4 The 'prefix' operator.
*
* The prefix operator MUST only have one variable in its expansion. More than one variable is
* an error condition. If the variable is undefined or an empty list then substitute the empty
* string. If the variable is a defined non-list then substitute the value of arg preceeded by
* the value of the variable. If the variable is a defined list then substitute the
* concatenation of every list value preceeded by the arg.
*
* Example:
*
*
*/
PREFIX {
String expand(String arg, List vars, Parameters parameters) {
StringBuffer expansion = new StringBuffer();
Variable var = vars.get(0);
String[] values = var.values(parameters);
if (values.length > 0 && values[0].length() > 0) {
for (String value : values) {
expansion.append(arg).append(URICoder.encode(value));
}
}
return expansion.toString();
}
},
/**
* 4.4.5 The 'suffix' operator.
*
* The prefix operator MUST only have one variable in its expansion. More than one variable is
* an error condition. If the variable is undefined or an empty list then substitute the empty
* string. If the variable is a defined non-list then substitute the value of arg followed by
* the value of the variable. If the variable is a defined list then substitute the
* concatenation of every list value followed by the arg.
*
* Example:
*
*
*/
SUFFIX {
String expand(String arg, List vars, Parameters parameters) {
StringBuffer expansion = new StringBuffer();
Variable var = vars.get(0);
String[] values = var.values(parameters);
if (values.length > 0 && values[0].length() > 0) {
for (String value : values) {
expansion.append(URICoder.encode(value)).append(arg);
}
}
return expansion.toString();
}
},
/**
* 4.4.6 The 'join' operator.
*
* Supplying a list variable to the join operator is an error. For each variable that is defined
* and non-empty create a keyvalue string that is the concatenation of the variable name, "=",
* and the variable value. Concatenate more than one keyvalue string with intervening values of
* arg to create the substitution value. The order of variables MUST be preserved during
* substitution.
*
* Example:
*
*
*/
JOIN {
String expand(String arg, List vars, Parameters parameters) {
StringBuffer expansion = new StringBuffer();
boolean first = true;
for (Iterator i = vars.iterator(); i.hasNext();) {
Variable var = i.next();
if (parameters.exists(var.name())) {
String[] values = var.values(parameters);
for (String value : values) {
if (!first)
expansion.append(arg);
else
first = false;
expansion.append(var.name()).append('=').append(URICoder.encode(value));
}
}
}
return expansion.toString();
}
},
/**
* 4.4.7 The 'list' operator.
*
* The list operator MUST have only one variable in its expansion and that variable must be
* a list. More than one variable is an error. If the list is non-empty then substitute the
* concatenation of all the list members with intervening values of arg. If the list is empty or
* the variable is undefined them substitute the empty string.
*
* Example:
*
*
*/
LIST {
String expand(String arg, List vars, Parameters parameters) {
StringBuffer expansion = new StringBuffer();
Variable var = vars.get(0);
String[] values = var.values(parameters);
if (values.length > 0 && values[0].length() > 0) {
for (int i = 0; i < values.length; i++) {
if (i > 0)
expansion.append(arg);
expansion.append(URICoder.encode(values[i]));
}
}
return expansion.toString();
}
};
/**
* Applies the expansion rules defined for the operator given the specified argument, variable and
* parameters.
*
* @param arg The argument for the operator.
* @param vars The variables for the operator.
* @param params The parameters to use.
*/
abstract String expand(String arg, List vars, Parameters params);
}
/**
* The operator.
*/
private Operator _operator;
/**
* The argument for this token.
*/
private String _arg;
/**
* The variables for this token.
*/
private List _vars;
/**
* Creates a new operator token.
*
* @param op The operator to use.
* @param arg The argument for this operator.
* @param vars The variables for this operator.
*
* @throws NullPointerException If any of the argument is null.
*/
public TokenOperatorD3(Operator op, String arg, List vars) throws NullPointerException {
super(toExpression(op, arg, vars));
if (op == null || arg == null || vars == null)
throw new NullPointerException("The operator must have a value");
this._operator = op;
this._arg = arg;
this._vars = vars;
}
/**
* Expands the token operator using the specified parameters.
*
* @param parameters The parameters for variable substitution.
*
* @return The corresponding expanded string.
*/
public String expand(Parameters parameters) {
return this._operator.expand(this._arg, this._vars, parameters);
}
/**
* Returns the operator part of this token.
*
* @return the operator.
*/
public Operator operator() {
return this._operator;
}
/**
* Returns the argument part of this token.
*
* @return the argument.
*/
public String argument() {
return this._arg;
}
/**
* {@inheritDoc}
*/
public List variables() {
return this._vars;
}
/**
* Returns the operator if it is defined in this class.
*
* @param op The string representation of an operator.
*
* @return The corresponding operator instance.
*/
public static Operator toOperator(String op) {
for (Operator o : Operator.values()) {
if (o.name().toLowerCase().equals(op))
return o;
}
return null;
}
/**
* {@inheritDoc}
*/
public boolean resolve(String expanded, Map values) {
// TODO
return false;
}
// static methods -------------------------------------------------------------
/**
* Parses the specified string and returns the corresponding token.
*
* This method accepts both the raw expression or the expression wrapped in curly brackets.
*
* @param exp The expression to parse.
*
* @return The corresponding token.
*
* @throws URITemplateSyntaxException If the string cannot be parsed as a valid
*/
public static TokenOperatorD3 parse(String exp) throws URITemplateSyntaxException {
String sexp = strip(exp);
String[] parts = sexp.split("\\|");
if (parts.length != 3)
throw new URITemplateSyntaxException(sexp, "An operator expansion must has three parts");
String op = parts[0];
String arg = parts[1];
String vars = parts[2];
// parse the variables
if (!op.startsWith("-"))
throw new URITemplateSyntaxException(op, "An operator must start with '-'");
Operator operator = TokenOperatorD3.toOperator(op.substring(1));
if (operator == null)
throw new URITemplateSyntaxException(op, "This operator is not supported");
List variables = toVariables(vars);
return new TokenOperatorD3(operator, arg, variables);
}
/**
* Generate the expression corresponding to the specified operator, argument and variables.
*
* @param op The operator.
* @param arg the argument.
* @param vars The variables.
*/
private static String toExpression(Operator op, String arg, List vars) {
StringBuffer exp = new StringBuffer();
exp.append('{');
exp.append(op.name().toLowerCase());
exp.append('|');
exp.append(arg);
exp.append('|');
for (Variable v : vars) {
exp.append(v.toString());
}
exp.append('}');
return exp.toString();
}
}
