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/*

* Copyright © 2012 The Feign Authors (feign@commonhaus.dev)

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

package feign;

import static feign.Util.checkState;

import static feign.Util.emptyToNull;

import feign.Request.HttpMethod;

import java.lang.reflect.Parameter;

import java.util.ArrayList;

import java.util.Collection;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class DefaultContract extends DeclarativeContract {

static final Pattern REQUEST_LINE_PATTERN = Pattern.compile("^([A-Z]+)[ ]*(.*)$");

public DefaultContract() {

super.registerClassAnnotation(

Headers.class,

(header, data) -> {

final String[] headersOnType = header.value();

checkState(

headersOnType.length > 0,

"Headers annotation was empty on type %s.",

data.configKey());

final Map<String, Collection<String>> headers = toMap(headersOnType);

headers.putAll(data.template().headers());

data.template().headers(null); // to clear

data.template().headers(headers);

});

super.registerMethodAnnotation(

RequestLine.class,

(ann, data) -> {

final String requestLine = ann.value();

checkState(

emptyToNull(requestLine) != null,

"RequestLine annotation was empty on method %s.",

data.configKey());

final Matcher requestLineMatcher = REQUEST_LINE_PATTERN.matcher(requestLine);

if (!requestLineMatcher.find()) {

throw new IllegalStateException(

String.format(

"RequestLine annotation didn't start with an HTTP verb on method %s",

data.configKey()));

} else {

data.template().method(HttpMethod.valueOf(requestLineMatcher.group(1)));

data.template().uri(requestLineMatcher.group(2));

}

data.template().decodeSlash(ann.decodeSlash());

data.template().collectionFormat(ann.collectionFormat());

});

super.registerMethodAnnotation(

Body.class,

(ann, data) -> {

final String body = ann.value();

checkState(

emptyToNull(body) != null,

"Body annotation was empty on method %s.",

data.configKey());

if (body.indexOf('{') == -1) {

data.template().body(body);

} else {

data.template().bodyTemplate(body);

}

});

super.registerMethodAnnotation(

Headers.class,

(header, data) -> {

final String[] headersOnMethod = header.value();

checkState(

headersOnMethod.length > 0,

"Headers annotation was empty on method %s.",

data.configKey());

data.template().headers(toMap(headersOnMethod));

});

super.registerParameterAnnotation(

Param.class,

(paramAnnotation, data, paramIndex) -> {

final String annotationName = paramAnnotation.value();

final Parameter parameter = data.method().getParameters()[paramIndex];

final String name;

if (emptyToNull(annotationName) == null && parameter.isNamePresent()) {

name = parameter.getName();

} else {

name = annotationName;

}

checkState(

emptyToNull(name) != null,

"Param annotation was empty on param %s.\nHint: %s",

paramIndex,

"Prefer using @Param(value=\"name\"), or compile your code with the -parameters flag.\n"

+ "If the value is missing, Feign attempts to retrieve the parameter name from bytecode, "

+ "which only works if the class was compiled with the -parameters flag.");

nameParam(data, name, paramIndex);

final Class<? extends Param.Expander> expander = paramAnnotation.expander();

if (expander != Param.ToStringExpander.class) {

data.indexToExpanderClass().put(paramIndex, expander);

}

if (!data.template().hasRequestVariable(name)) {

data.formParams().add(name);

}

});

super.registerParameterAnnotation(

QueryMap.class,

(queryMap, data, paramIndex) -> {

checkState(

data.queryMapIndex() == null,

"QueryMap annotation was present on multiple parameters.");

data.queryMapIndex(paramIndex);

data.queryMapEncoder(queryMap.mapEncoder().instance());

});

super.registerParameterAnnotation(

HeaderMap.class,

(queryMap, data, paramIndex) -> {

checkState(

data.headerMapIndex() == null,

"HeaderMap annotation was present on multiple parameters.");

data.headerMapIndex(paramIndex);

});

}

private static Map<String, Collection<String>> toMap(String[] input) {

final Map<String, Collection<String>> result =

new LinkedHashMap<String, Collection<String>>(input.length);

for (final String header : input) {

final int colon = header.indexOf(':');

final String name = header.substring(0, colon);

if (!result.containsKey(name)) {

result.put(name, new ArrayList<String>(1));

}

result.get(name).add(header.substring(colon + 1).trim());

}

return result;

}

}