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Handy URI Templates is a RFC6570 compliant URI template processor. The library allows clients to
utilize templatized URIs and inject replacement variables to expand the template into a URI. The library sports
a fluent API, ability to plugin custom object renderers, and supports all levels of URI templates.
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/*
*
*
*/
package com.damnhandy.uri.template;
import com.damnhandy.uri.template.impl.Modifier;
import com.damnhandy.uri.template.impl.Operator;
import com.damnhandy.uri.template.impl.UriTemplateParser;
import com.damnhandy.uri.template.impl.VarSpec;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.LinkedList;
import java.util.Map;
/**
*
* A utility class used for programatically generating a {@link UriTemplate}.
* The class can be used as follows:
*
*
* UriTemplate template = UriTemplate.buildFromTemplate("http://example.com")
* .literal("/foo")
* .path(var("thing1"), var("explodedThing", true))
* .fragment(var("prefix", 2))
* .build();
*
*
* This code will return a {@link UriTemplate} with the following value:
*
*
* http://example.com/foo{/thing1,explodedThing*}{#prefix:2}
*
*
* @author Ryan J. McDonough
* @version $Revision: 1.1 $
*/
public final class UriTemplateBuilder
{
/**
* The URI expression
*/
private LinkedList components = new LinkedList();
/**
*
*/
private DateTimeFormatter defaultDateTimeFormatter = null;
/**
*
*/
private Map values = null;
UriTemplateBuilder() {
this.components = new LinkedList();
}
/**
* Create a new UriTemplateBuilder.
*
* @param templateString the initial URI template string
*/
UriTemplateBuilder(String templateString) throws MalformedUriTemplateException
{
this.components = new UriTemplateParser().scan(templateString);
}
/**
* Create a new UriTemplateBuilder.
*
* @param template the initial UriTemplate
*/
UriTemplateBuilder(UriTemplate template) throws MalformedUriTemplateException
{
this(template.getTemplate());
this.values = template.getValues();
this.defaultDateTimeFormatter = template.defaultDateTimeFormatter;
}
/**
* @param dateFormatString the date format to use internally
* @return the UriTemplateBuilder
* @since 2.0
*/
public UriTemplateBuilder withDefaultDateFormat(String dateFormatString)
{
return this.withDefaultDateFormat(DateTimeFormat.forPattern(dateFormatString));
}
private UriTemplateBuilder withDefaultDateFormat(DateTimeFormatter dateTimeFormatter)
{
defaultDateTimeFormatter = dateTimeFormatter;
return this;
}
/**
* @param dateFormat the date format to use internally
* @return the UriTemplateBuilder
* @since 2.0
* @deprecated replaced by {@link #withDefaultDateFormat(String) withDefaultDateFormat}
*/
@Deprecated
public UriTemplateBuilder withDefaultDateFormat(DateFormat dateFormat)
{
if (!(dateFormat instanceof SimpleDateFormat))
{
throw new IllegalArgumentException(
"The only supported subclass of java.text.DateFormat is java.text.SimpleDateFormat");
}
defaultDateTimeFormatter = DateTimeFormat.forPattern(((SimpleDateFormat) dateFormat).toPattern());
return this;
}
void addComponent(UriTemplateComponent component)
{
this.components.add(component);
}
void addComponents(Collection compoments)
{
this.components.addAll(compoments);
}
/**
* Appends a {@link Literal} value to the {@link UriTemplate}. The following
* code:
*
*
* UriTemplate template = UriTemplate.buildFromTemplate("http://example.com")
* .literal("/foo")
* .build();
*
*
* Will generate the following template:
*
*
* http://example.com/foo
*
*
* Note that this particular example has no expressions, so it's not a valid URI template.
*
* @param string the literal string
* @return
*/
public UriTemplateBuilder literal(String string)
{
if (string == null)
{
return this;
}
addComponent(new Literal(string, 0));
return this;
}
/**
* @param varSpec the varspec name
* @return the array of varspecs
*/
private static VarSpec[] toVarSpec(String... varSpec)
{
VarSpec[] vars = new VarSpec[varSpec.length];
for (int i = 0; i < varSpec.length; i++)
{
vars[i] = var(varSpec[i]);
}
return vars;
}
/**
* Appends a template expression using no operator. The following
* code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .simple("foo")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{foo}
*
*
* @param var the name of the variable
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder simple(String... var)
{
simple(toVarSpec(var));
return this;
}
/**
* Appends a template expression using no operator but with an optional
* modifier. The following code:
*
* import static com.damnhandy.uri.template.UriTemplateBuilder.var;
*
* ...
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .simple(var("foo",true))
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{foo*}
*
*
* @param var the varspec
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder simple(VarSpec... var)
{
addComponent(Expression.simple(var).build());
return this;
}
/**
* Appends a template expression using the reserved operator (+). The following
* code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .reserved("foo")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{+foo}
*
*
* @param var the varspec name
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder reserved(String... var)
{
reserved(toVarSpec(var));
return this;
}
/**
* Appends a template expression using the reserved operator (+) along
* with an optional modifier. The following code:
*
* import static com.damnhandy.uri.template.UriTemplateBuilder.var;
*
* ...
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .reserved(var("foo",1))
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{+foo:1}
*
*
* @param var the varspec
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder reserved(VarSpec... var)
{
addComponent(Expression.reserved(var).build());
return this;
}
/**
* Appends a template expression using the fragment operator (#). The
* following code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .fragement("foo")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{#foo}
*
*
* @param var the varspec name
* @return the UriTemplateBuilder
* @throws UriTemplateBuilderException if you attempt to add more than one fragment expression, a UriTemplateBuilderException will be raised
*/
public UriTemplateBuilder fragment(String... var) throws UriTemplateBuilderException
{
fragment(toVarSpec(var));
return this;
}
/**
* Appends a template expression using the fragment operator (#) with a
* modifier. The following code:
*
* import static com.damnhandy.uri.template.UriTemplateBuilder.var;
*
* ...
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .fragement(var("foo", 1))
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{#foo:1}
*
*
* @param var the varspec
* @return the UriTemplateBuilder
* @throws UriTemplateBuilderException if you attempt to add more than one fragment expression, a UriTemplateBuilderException will be raised
*/
public UriTemplateBuilder fragment(VarSpec... var) throws UriTemplateBuilderException
{
if (hasExpressionWithOperator(Operator.FRAGMENT))
{
throw new UriTemplateBuilderException("The template already has a fragment expression and this would not result in a valid URI");
}
addComponent(Expression.fragment(var).build());
return this;
}
/**
* Scans the components for an expression with the specified operator.
*
* @param op
* @return
*/
private boolean hasExpressionWithOperator(Operator op)
{
for (UriTemplateComponent c : components)
{
if (Expression.class.isInstance(c))
{
Expression e = (Expression) c;
if (e.getOperator() == op)
{
return true;
}
}
}
return false;
}
/**
* Appends a template expression using the label (.) operator. The following
* code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .label("foo")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{.foo}
*
*
* @param var the varspec name
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder label(String... var)
{
label(toVarSpec(var));
return this;
}
/**
* Appends a template expression using the label (.) operator and modifier.
* The following code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .label(var("foo", true))
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{.foo*}
*
*
* @param var the varspec
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder label(VarSpec... var)
{
addComponent(Expression.label(var).build());
return this;
}
/**
* Appends a template expression using the matrix (;) operator. The following
* code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .matrix("foo")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{;foo}
*
*
* @param var the varspec name
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder matrix(String... var)
{
matrix(toVarSpec(var));
return this;
}
/**
* Appends a template expression using the matrix (;) operator and modifier.
* The following code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .matrix(var("foo", true))
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{;foo*}
*
*
* @param var the varspec
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder matrix(VarSpec... var)
{
addComponent(Expression.matrix(var).build());
return this;
}
/**
* Appends a template expression using the path (/) operator. The following
* code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com")
* .path("foo")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com{/foo}
*
*
* @param var the varspec name
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder path(String... var)
{
path(toVarSpec(var));
return this;
}
/**
* Appends a template expression using the path (/) operator and modifier.
* The following code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com")
* .path(var("foo", 1))
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com{/foo:1}
*
*
* @param var the varspec
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder path(VarSpec... var)
{
addComponent(Expression.path(var).build());
return this;
}
/**
* Appends a template expression using the query (?) operator. The following
* code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .query("foo")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{?foo}
*
*
* @param var the varspec name
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder query(String... var)
{
query(toVarSpec(var));
return this;
}
/**
* Appends a template expression using the query (?) operator and
* and optional modifier. The following
* code:
*
* import static com.damnhandy.uri.template.UriTemplateBuilder.var;
*
* ...
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .query(var("foo",1))
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{?foo:1}
*
*
* @param var the varspec
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder query(VarSpec... var)
{
addComponent(Expression.query(var).build());
return this;
}
/**
* Appends a template expression using the form-style query continuation. The following
* code:
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .continuation("foo")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{&foo}
*
*
* @param var the varspec name
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder continuation(String... var)
{
return continuation(toVarSpec(var));
}
/**
* Appends a template expression using the form-style query continuation and
* and optional modifier. The following
* code:
*
* import static com.damnhandy.uri.template.UriTemplateBuilder.var;
*
* ...
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .query(var("foo",1))
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/{&foo:1}
*
*
* @param var the varspec
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder continuation(VarSpec... var)
{
addComponent(Expression.continuation(var).build());
return this;
}
/**
* Parses the template and appends the parsed components
* to the builder. The following
* code:
*
* import static com.damnhandy.uri.template.UriTemplateBuilder.var;
*
* ...
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .template("foo/{id}{?filter}")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/foo/{id}{?filter}
*
*
* @param template the uri template
* @return the UriTemplateBuilder
*/
public UriTemplateBuilder template(UriTemplate... template) {
for(UriTemplate t : template) {
addComponents(t.getComponents());
}
return this;
}
/**
* Parses the template and appends the parsed components
* to the builder. The following
* code:
*
* import static com.damnhandy.uri.template.UriTemplateBuilder.var;
*
* ...
*
* UriTemplate template =
* UriTemplate.buildFromTemplate("http://example.com/")
* .template("foo/{id}{?filter}")
* .build();
*
* Will generate the following URI Template string:
*
* http://example.com/foo/{id}{?filter}
*
*
* @param template the uri template string
* @return the uri template builder
*/
public UriTemplateBuilder template(String... template) {
UriTemplateParser parser = new UriTemplateParser();
for(String t : template) {
addComponents(parser.scan(t));
}
return this;
}
/**
* Returns an array of the components in the Builder.
* @return array of the components in the Builder
*/
public UriTemplateComponent[] getComponents()
{
return this.components.toArray(new UriTemplateComponent[components.size()]);
}
/**
*
* Generates a {@link UriTemplate} instance from the builder.
*
*
* @return the UriTemplate
* @since 2.0
*/
public UriTemplate build() throws MalformedUriTemplateException
{
UriTemplate template = new UriTemplate(this.components);
if (this.values != null)
{
template.set(values);
}
if (defaultDateTimeFormatter != null)
{
template.defaultDateTimeFormatter = defaultDateTimeFormatter;
}
return template;
}
/**
* Adds a variable name to the expression.
*
*
* var("foo");
*
*
* Will yield the following expression:
*
* {foo}
*
*
* @param varName the varspec name
* @return the {@link com.damnhandy.uri.template.impl.VarSpec} for the specified name
*/
public static VarSpec var(String varName)
{
return var(varName, Modifier.NONE, null);
}
/**
* Adds a variable name to the expression with an explode modifier.
*
*
* var("foo",true);
*
*
* Will yield the following expression:
*
* {foo*}
*
*
* @param varName the varspec name
* @param explode boolean to indicate that this VarSpec should use the explode modifer
* @return the {@link com.damnhandy.uri.template.impl.VarSpec} for the specified name
*/
public static VarSpec var(String varName, boolean explode)
{
if (explode)
{
return var(varName, Modifier.EXPLODE, null);
}
return var(varName, Modifier.NONE, null);
}
/**
* Adds a variable name to the expression with a prefix modifier.
*
*
* var("foo",2);
*
*
* Will yield the following expression:
*
* {foo:2}
*
*
* @param varName the varspec name
* @param prefix the prefix position
* @return the {@link com.damnhandy.uri.template.impl.VarSpec} for the specified name
*/
public static VarSpec var(String varName, int prefix)
{
return var(varName, Modifier.PREFIX, prefix);
}
/**
* @param varName the varspec name
* @param modifier the modifier
* @param position the prefix position
* @return the {@link com.damnhandy.uri.template.impl.VarSpec} for the specified name
*/
private static VarSpec var(String varName, Modifier modifier, Integer position)
{
return new VarSpec(varName, modifier, position);
}
}
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