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/**
* Copyright (C) 2013 Google Inc.
* Licensed to The Android Open Source Project.
*
* 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.android.mail.ui;
import android.content.Context;
import android.content.res.Resources;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Formatter;
/**
* Abstract class to support common functionality for both
* {@link com.android.mail.ui.HtmlConversationTemplates} and
* {@link com.android.mail.print.HtmlPrintTemplates}.
*
* Renders data into very simple string-substitution HTML templates.
*
* Templates should be UTF-8 encoded HTML with '%s' placeholders to be substituted upon render.
* Plain-jane string substitution with '%s' is slightly faster than typed substitution.
*/
public abstract class AbstractHtmlTemplates {
// TODO: refine. too expensive to iterate over cursor and pre-calculate total. so either
// estimate it, or defer assembly until the end when size is known (deferring increases
// working set size vs. estimation but is exact).
private static final int BUFFER_SIZE_CHARS = 64 * 1024;
protected Context mContext;
protected Formatter mFormatter;
protected StringBuilder mBuilder;
protected boolean mInProgress = false;
public AbstractHtmlTemplates(Context context) {
mContext = context;
}
public String emit() {
final String out = mFormatter.toString();
// release the builder memory ASAP
mFormatter = null;
mBuilder = null;
return out;
}
public void reset() {
mBuilder = new StringBuilder(BUFFER_SIZE_CHARS);
mFormatter = new Formatter(mBuilder, null /* no localization */);
}
protected String readTemplate(int id) throws Resources.NotFoundException {
final StringBuilder out = new StringBuilder();
InputStreamReader in = null;
try {
try {
in = new InputStreamReader(
mContext.getResources().openRawResource(id), "UTF-8");
final char[] buf = new char[4096];
int chars;
while ((chars=in.read(buf)) > 0) {
out.append(buf, 0, chars);
}
return out.toString();
} finally {
if (in != null) {
in.close();
}
}
} catch (IOException e) {
throw new Resources.NotFoundException("Unable to open template id="
+ Integer.toHexString(id) + " exception=" + e.getMessage());
}
}
protected void append(String template, Object... args) {
mFormatter.format(template, args);
}
}
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