/**
* jetbrick-template
* http://subchen.github.io/jetbrick-template/
*
* Copyright 2010-2014 Guoqiang Chen. All rights reserved.
* Email: subchen@gmail.com
*
* 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 jetbrick.template.runtime;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Array;
import java.util.*;
import jetbrick.template.JetContext;
import jetbrick.template.JetTemplate;
import jetbrick.template.resource.Resource;
import jetbrick.template.utils.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public final class JetUtils {
private static final Logger log = LoggerFactory.getLogger(JetUtils.class);
public static boolean asBoolean(Object value) {
if (value == null) return false;
Class<?> klass = value.getClass();
if (Boolean.class.equals(klass)) return (Boolean) value;
if (value instanceof Collection) return !((Collection<?>) value).isEmpty();
if (value instanceof Map) return !((Map<?, ?>) value).isEmpty();
if (value instanceof CharSequence) return ((CharSequence) value).length() > 0;
if (value instanceof Number) return ((Number) value).intValue() != 0;
if (klass.isArray()) return Array.getLength(value) > 0;
if (value instanceof Character) return ((Character) value) != '\0';
if (value instanceof Enumeration) return ((Enumeration<?>) value).hasMoreElements();
if (value instanceof Iterator) return ((Iterator<?>) value).hasNext();
if (value instanceof Iterable) return ((Iterable<?>) value).iterator().hasNext();
return true;
}
/**
* @deprecated From 1.1.3 改为 JetForIterator 内部实现.
*/
@SuppressWarnings("rawtypes")
public static Iterator<?> asIterator(Object value) {
return new JetForIterator(value);
}
/**
* 返回一个 Map。类似于 Arrays.asList(...)。
*
* <p>注意：这里必须去掉泛型类型，使用 rawtypes, 防止生成的模板出现编译错误。</p>
*/
@SuppressWarnings("rawtypes")
public static Map asMap(Object... values) {
if (values == null || values.length == 0) {
return Collections.emptyMap();
}
if (values.length % 2 == 1) {
throw new IllegalArgumentException("Mismatched arguments count.");
}
Map<Object, Object> map = new HashMap<Object, Object>(values.length);
for (int i = 0; i < values.length; i += 2) {
map.put(values[i], values[i + 1]);
}
return map;
}
public static byte[] asBytes(String value, String encoding) {
try {
return value.getBytes(encoding);
} catch (UnsupportedEncodingException e) {
throw ExceptionUtils.uncheck(e);
}
}
public static boolean asEquals(Object obj1, Object obj2) {
if (obj1 == obj2) return true;
if (obj1 == null || obj2 == null) return false;
if (obj1 instanceof Number && obj2 instanceof Number) {
return ((Number) obj1).doubleValue() == ((Number) obj2).doubleValue();
}
return obj1.equals(obj2);
}
public static boolean asNotEquals(Object obj1, Object obj2) {
return !asEquals(obj1, obj2);
}
@SuppressWarnings("unchecked")
public static int asCompareWith(Object lhs, Object rhs) {
if (lhs == rhs) return 0;
// null compare
if (lhs == null) return -1;
if (rhs == null) return 1;
// numeric compare
if (Character.class.equals(lhs)) {
lhs = Integer.valueOf(((Character) lhs).charValue());
}
if (Character.class.equals(rhs)) {
rhs = Integer.valueOf(((Character) rhs).charValue());
}
if (lhs instanceof Number && rhs instanceof Number) {
return (int) (((Number) lhs).doubleValue() - ((Number) rhs).doubleValue());
}
// object compare
if (lhs instanceof Comparable) {
return ((Comparable<Object>) lhs).compareTo(rhs);
}
throw new ClassCastException(lhs.getClass().getName() + " cannot be cast to java.util.Comparable");
}
public static String asEscapeHtml(String value) {
return StringEscapeUtils.escapeXml(value);
}
// render 子模板，并直接输出
public static void asInclude(JetPageContext ctx, String relativeName, Map<String, Object> parameters) {
if (relativeName == null || relativeName.length() == 0) {
throw new IllegalArgumentException("argument relativeName is null or empty.");
}
String file = ctx.getAbsolutionName(relativeName);
JetTemplate template = ctx.getEngine().getTemplate(file);
JetContext context = new JetContext(ctx.getContext(), parameters);
JetWriter writer = ctx.getWriter();
template.render(context, writer);
}
// render 子模板，并返回生成的内容
public static String asIncludeContent(JetPageContext ctx, String relativeName, Map<String, Object> parameters) {
if (relativeName == null || relativeName.length() == 0) {
throw new IllegalArgumentException("argument relativeName is null or empty.");
}
String file = ctx.getAbsolutionName(relativeName);
JetTemplate template = ctx.getEngine().getTemplate(file);
JetContext context = new JetContext(ctx.getContext(), parameters);
UnsafeCharArrayWriter os = new UnsafeCharArrayWriter();
template.render(context, os);
return os.toString();
}
// 读取纯文本内容
public static String asReadContent(JetPageContext ctx, String relativeName, String encoding) {
if (relativeName == null || relativeName.length() == 0) {
throw new IllegalArgumentException("argument relativeName is null or empty.");
}
String file = ctx.getAbsolutionName(relativeName);
Resource resource = ctx.getEngine().getResource(file);
if (encoding == null) {
encoding = ctx.getEngine().getConfig().getOutputEncoding();
}
return new String(resource.getSource(encoding));
}
public static void debug(String format, Object... args) {
if (log.isDebugEnabled()) {
format = "template debug: " + format;
log.debug(format, args);
}
}
}