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/*
* Copyright 2010 Google Inc.
*
* 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 com.google.gwt.i18n.shared;
import com.google.gwt.i18n.client.HasDirection.Direction;
import com.google.gwt.i18n.client.LocaleInfo;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import com.google.gwt.safehtml.shared.annotations.SuppressIsSafeHtmlCastCheck;
import java.util.HashMap;
/**
* A wrapper to {@link BidiFormatter} whose methods return {@code SafeHtml}
* instead of {@code String}.
*/
public class SafeHtmlBidiFormatter extends BidiFormatterBase {
static class Factory extends BidiFormatterBase.Factory {
@Override
public SafeHtmlBidiFormatter createInstance(Direction contextDir,
boolean alwaysSpan) {
return new SafeHtmlBidiFormatter(contextDir, alwaysSpan);
}
}
private static Factory factory = new Factory();
private static HashMap cachedSafeHtmlValues = null;
/**
* Factory for creating an instance of SafeHtmlBidiFormatter given the context
* direction. The default behavior of {@link #spanWrap} and its variations is
* set to avoid span wrapping unless it's necessary ('dir' attribute needs to
* be set).
*
* @param rtlContext Whether the context direction is RTL.
* In one simple use case, the context direction would simply be the
* locale direction, which can be retrieved using
* {@code LocaleInfo.getCurrentLocale().isRTL()}
*/
public static SafeHtmlBidiFormatter getInstance(boolean rtlContext) {
return getInstance(rtlContext, false);
}
/**
* Factory for creating an instance of SafeHtmlBidiFormatter given the context
* direction and the desired span wrapping behavior (see below).
*
* @param rtlContext Whether the context direction is RTL. See an example of
* a simple use case at {@link #getInstance(boolean)}
* @param alwaysSpan Whether {@link #spanWrap} (and its variations) should
* always use a 'span' tag, even when the input direction is neutral
* or matches the context, so that the DOM structure of the output
* does not depend on the combination of directions
*/
public static SafeHtmlBidiFormatter getInstance(boolean rtlContext,
boolean alwaysSpan) {
return getInstance(rtlContext ? Direction.RTL : Direction.LTR, alwaysSpan);
}
/**
* Factory for creating an instance of SafeHtmlBidiFormatter given the context
* direction. The default behavior of {@link #spanWrap} and its variations is
* set to avoid span wrapping unless it's necessary ('dir' attribute needs to
* be set).
*
* @param contextDir The context direction. See an example of a simple use
* case at {@link #getInstance(boolean)}. Note: Direction.DEFAULT
* indicates unknown context direction. Try not to use it, since it
* is impossible to reset the direction back to the context when it
* is unknown
*/
public static SafeHtmlBidiFormatter getInstance(Direction contextDir) {
return getInstance(contextDir, false);
}
/**
* Factory for creating an instance of SafeHtmlBidiFormatter given the context
* direction and the desired span wrapping behavior (see below).
*
* @param contextDir The context direction. See an example of a simple use
* case at {@link #getInstance(boolean)}. Note: Direction.DEFAULT
* indicates unknown context direction. Try not to use it, since it
* is impossible to reset the direction back to the context when it
* is unknown
* @param alwaysSpan Whether {@link #spanWrap} (and its variations) should
* always use a 'span' tag, even when the input direction is neutral
* or matches the context, so that the DOM structure of the output
* does not depend on the combination of directions
*/
public static SafeHtmlBidiFormatter getInstance(Direction contextDir,
boolean alwaysSpan) {
return factory.getInstance(contextDir, alwaysSpan);
}
/**
* Factory for creating an instance of SafeHtmlBidiFormatter whose context
* direction matches the current locale's direction. The default behavior of
* {@link #spanWrap} and its variations is set to avoid span wrapping unless
* it's necessary ('dir' attribute needs to be set).
*/
public static SafeHtmlBidiFormatter getInstanceForCurrentLocale() {
return getInstanceForCurrentLocale(false);
}
/**
* Factory for creating an instance of SafeHtmlBidiFormatter whose context
* direction matches the current locale's direction, and given the desired
* span wrapping behavior (see below).
*
* @param alwaysSpan Whether {@link #spanWrap} (and its variations) should
* always use a 'span' tag, even when the input direction is neutral
* or matches the context, so that the DOM structure of the output
* does not depend on the combination of directions
*/
public static SafeHtmlBidiFormatter getInstanceForCurrentLocale(
boolean alwaysSpan) {
return getInstance(LocaleInfo.getCurrentLocale().isRTL(), alwaysSpan);
}
/**
* @param contextDir The context direction
* @param alwaysSpan Whether {@link #spanWrap} (and its variations) should
* always use a 'span' tag, even when the input direction is neutral
* or matches the context, so that the DOM structure of the output
* does not depend on the combination of directions
*/
private SafeHtmlBidiFormatter(Direction contextDir, boolean alwaysSpan) {
super(contextDir, alwaysSpan);
}
/**
* @see BidiFormatter#dirAttr(String, boolean)
*
* @param html Html whose direction is to be estimated
* @return "dir=rtl" for RTL text in non-RTL context; "dir=ltr" for LTR text
* in non-LTR context; else, the empty string.
*/
public SafeHtml dirAttr(SafeHtml html) {
return cachedSafeHtml(dirAttrBase(html.asString(), true));
}
/**
* @see BidiFormatter#dirAttr
*
* @param str String whose direction is to be estimated
* @return "dir=rtl" for RTL text in non-RTL context; "dir=ltr" for LTR text
* in non-LTR context; else, the empty string.
*/
public SafeHtml dirAttr(String str) {
return cachedSafeHtml(dirAttrBase(str, false));
}
/**
* Returns "left" for RTL context direction. Otherwise (LTR or default /
* unknown context direction) returns "right".
*/
public SafeHtml endEdge() {
return cachedSafeHtml(endEdgeBase());
}
/**
* @see BidiFormatterBase#estimateDirection(String, boolean)
*
* @param html Html whose direction is to be estimated
* @return {@code html}'s estimated overall direction
*/
public Direction estimateDirection(SafeHtml html) {
return estimateDirection(html.asString(), true);
}
/**
* @see BidiFormatter#knownDirAttr
*
* @param dir Given direction
* @return "dir=rtl" for RTL text in non-RTL context; "dir=ltr" for LTR text
* in non-LTR context; else, the empty string.
*/
public SafeHtml knownDirAttr(Direction dir) {
return cachedSafeHtml(knownDirAttrBase(dir));
}
/**
* @see BidiFormatter#mark
*/
public SafeHtml mark() {
return cachedSafeHtml(markBase());
}
/**
* @see BidiFormatter#markAfter
*
* @param html Html after which the mark may need to appear
* @return LRM for RTL text in LTR context; RLM for LTR text in RTL context;
* else, the empty string.
*/
public SafeHtml markAfter(SafeHtml html) {
return cachedSafeHtml(markAfterBase(html.asString(), true));
}
/**
* @see BidiFormatter#markAfter
*
* @param str String after which the mark may need to appear
* @return LRM for RTL text in LTR context; RLM for LTR text in RTL context;
* else, the empty string.
*/
public SafeHtml markAfter(String str) {
return cachedSafeHtml(markAfterBase(str, false));
}
/**
* @see BidiFormatter#spanWrap(String, boolean)
*
* @param html The input html
* @return Input html after applying the above processing.
*/
public SafeHtml spanWrap(SafeHtml html) {
return spanWrap(html, true);
}
/**
* @see BidiFormatter#spanWrap(String, boolean, boolean)
*
* @param html The input html
* @param dirReset Whether to append a trailing unicode bidi mark matching the
* context direction, when needed, to prevent the possible garbling
* of whatever may follow {@code html}
* @return Input html after applying the above processing.
*/
public SafeHtml spanWrap(SafeHtml html, boolean dirReset) {
return SafeHtmlUtils.fromTrustedString(
spanWrapBase(html.asString(), true, dirReset));
}
/**
* @see BidiFormatter#spanWrap(String)
*
* @param str The input string
* @return Input string after applying the above processing.
*/
public SafeHtml spanWrap(String str) {
return spanWrap(str, true);
}
/**
* @see BidiFormatter#spanWrap(String, boolean, boolean)
*
* @param str The input string
* @param dirReset Whether to append a trailing unicode bidi mark matching the
* context direction, when needed, to prevent the possible garbling
* of whatever may follow {@code str}
* @return Input string after applying the above processing.
*/
@SuppressIsSafeHtmlCastCheck
public SafeHtml spanWrap(String str, boolean dirReset) {
// This is safe since spanWrapBase escapes plain-text input.
return SafeHtmlUtils.fromTrustedString(spanWrapBase(str, false, dirReset));
}
/**
* @see BidiFormatter#spanWrapWithKnownDir(
* com.google.gwt.i18n.client.HasDirection.Direction, String, boolean)
*
* @param dir {@code str}'s direction
* @param html The input html
* @return Input html after applying the above processing.
*/
public SafeHtml spanWrapWithKnownDir(Direction dir, SafeHtml html) {
return spanWrapWithKnownDir(dir, html, true);
}
/**
* @see BidiFormatter#spanWrapWithKnownDir(
* com.google.gwt.i18n.client.HasDirection.Direction, String, boolean, boolean)
*
* @param dir {@code html}'s direction
* @param html The input html
* @param dirReset Whether to append a trailing unicode bidi mark matching the
* context direction, when needed, to prevent the possible garbling
* of whatever may follow {@code html}
* @return Input html after applying the above processing.
*/
public SafeHtml spanWrapWithKnownDir(Direction dir, SafeHtml html,
boolean dirReset) {
return SafeHtmlUtils.fromTrustedString(
spanWrapWithKnownDirBase(dir, html.asString(), true, dirReset));
}
/**
* @see BidiFormatter#spanWrapWithKnownDir(
* com.google.gwt.i18n.client.HasDirection.Direction, String)
*
* @param dir {@code str}'s direction
* @param str The input string
* @return Input string after applying the above processing.
*/
public SafeHtml spanWrapWithKnownDir(Direction dir, String str) {
return spanWrapWithKnownDir(dir, str, true);
}
/**
* @see BidiFormatter#spanWrapWithKnownDir(
* com.google.gwt.i18n.client.HasDirection.Direction, String, boolean, boolean)
*
* @param dir {@code str}'s direction
* @param str The input string
* @param dirReset Whether to append a trailing unicode bidi mark matching the
* context direction, when needed, to prevent the possible garbling
* of whatever may follow {@code str}
* @return Input string after applying the above processing.
*/
@SuppressIsSafeHtmlCastCheck
public SafeHtml spanWrapWithKnownDir(Direction dir, String str, boolean dirReset) {
// This is safe since spanWrapWithKnownDirBase escapes plain-text input.
return SafeHtmlUtils.fromTrustedString(
spanWrapWithKnownDirBase(dir, str, false, dirReset));
}
/**
* Returns "right" for RTL context direction. Otherwise (LTR or default /
* unknown context direction) returns "left".
*/
public SafeHtml startEdge() {
return cachedSafeHtml(startEdgeBase());
}
/**
* @see BidiFormatter#unicodeWrap(String, boolean)
*
* @param html The input html
* @return Input html after applying the above processing.
*/
public SafeHtml unicodeWrap(SafeHtml html) {
return unicodeWrap(html, true);
}
/**
* @see BidiFormatter#unicodeWrap(String, boolean, boolean)
*
* @param html The input html
* @param dirReset Whether to append a trailing unicode bidi mark matching the
* context direction, when needed, to prevent the possible garbling
* of whatever may follow {@code html}
* @return Input html after applying the above processing.
*/
public SafeHtml unicodeWrap(SafeHtml html, boolean dirReset) {
return SafeHtmlUtils.fromTrustedString(
unicodeWrapBase(html.asString(), true, dirReset));
}
/**
* @see BidiFormatter#unicodeWrap(String)
*
* @param str The input string
* @return Input string after applying the above processing.
*/
public SafeHtml unicodeWrap(String str) {
return unicodeWrap(str, true);
}
/**
* @see BidiFormatter#unicodeWrap(String, boolean, boolean)
*
* @param str The input string
* @param dirReset Whether to append a trailing unicode bidi mark matching the
* context direction, when needed, to prevent the possible garbling
* of whatever may follow {@code str}
* @return Input string after applying the above processing.
*/
public SafeHtml unicodeWrap(String str, boolean dirReset) {
// unicodeWrapBase does not HTML-escape, so its return value is not trusted.
return SafeHtmlUtils.fromString(unicodeWrapBase(str, false, dirReset));
}
/**
* @see BidiFormatter#unicodeWrapWithKnownDir(
* com.google.gwt.i18n.client.HasDirection.Direction, String, boolean)
*
* @param dir {@code html}'s direction
* @param html The input html
* @return Input html after applying the above processing.
*/
public SafeHtml unicodeWrapWithKnownDir(Direction dir, SafeHtml html) {
return unicodeWrapWithKnownDir(dir, html, true);
}
/**
* @see BidiFormatter#unicodeWrapWithKnownDir(
* com.google.gwt.i18n.client.HasDirection.Direction, String, boolean, boolean)
*
* @param dir {@code html}'s direction
* @param html The input html
* @param dirReset Whether to append a trailing unicode bidi mark matching the
* context direction, when needed, to prevent the possible garbling
* of whatever may follow {@code html}
* @return Input html after applying the above processing.
*/
public SafeHtml unicodeWrapWithKnownDir(Direction dir, SafeHtml html,
boolean dirReset) {
return SafeHtmlUtils.fromTrustedString(
unicodeWrapWithKnownDirBase(dir, html.asString(), true, dirReset));
}
/**
* @see BidiFormatter#unicodeWrapWithKnownDir(
* com.google.gwt.i18n.client.HasDirection.Direction, String)
*
* @param dir {@code str}'s direction
* @param str The input string
* @return Input string after applying the above processing.
*/
public SafeHtml unicodeWrapWithKnownDir(Direction dir, String str) {
return unicodeWrapWithKnownDir(dir, str, true);
}
/**
* @see BidiFormatter#unicodeWrapWithKnownDir(
* com.google.gwt.i18n.client.HasDirection.Direction, String, boolean, boolean)
*
* @param dir {@code str}'s direction
* @param str The input string
* @param dirReset Whether to append a trailing unicode bidi mark matching the
* context direction, when needed, to prevent the possible garbling
* of whatever may follow {@code str}
* @return Input string after applying the above processing.
*/
public SafeHtml unicodeWrapWithKnownDir(Direction dir, String str,
boolean dirReset) {
/*
* unicodeWrapWithKnownDirBase does not HTML-escape, so its return value is
* not trusted.
*/
return SafeHtmlUtils.fromString(
unicodeWrapWithKnownDirBase(dir, str, false, dirReset));
}
/**
* Converts an input string into a SafeHtml. Input String must be safe (see
* {@link com.google.gwt.safehtml.shared.SafeHtml}).
* Implementation: first, tries to find the input in the static map,
* {@link #cachedSafeHtmlValues}. If not found, creates a SafeHtml instance
* for the string and adds it to the map.
*
* @param str String to search for. Must be safe (see
* {@link com.google.gwt.safehtml.shared.SafeHtml}).
*
* @return Input as SafeHtml
*/
private SafeHtml cachedSafeHtml(String str) {
if (cachedSafeHtmlValues == null) {
cachedSafeHtmlValues = new HashMap();
}
SafeHtml entry = cachedSafeHtmlValues.get(str);
if (entry == null) {
entry = SafeHtmlUtils.fromString(str);
cachedSafeHtmlValues.put(str, entry);
}
return entry;
}
}
