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/*
* Copyright (C) 2015 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.voicemail.impl.mail.store.imap;
import com.android.voicemail.impl.VvmLog;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
/**
* Class represents an IMAP "element" that is not a list.
*
* <p>An atom, quoted string, literal, are all represented by this. Values like OK, STATUS are too.
* Also, this class class may contain more arbitrary value like "BODY[HEADER.FIELDS ("DATE")]". See
* {@link ImapResponseParser}.
*/
public abstract class ImapString extends ImapElement {
private static final byte[] EMPTY_BYTES = new byte[0];
public static final ImapString EMPTY =
new ImapString() {
@Override
public void destroy() {
// Don't call super.destroy().
// It's a shared object. We don't want the mDestroyed to be set on this.
}
@Override
public String getString() {
return "";
}
@Override
public InputStream getAsStream() {
return new ByteArrayInputStream(EMPTY_BYTES);
}
@Override
public String toString() {
return "";
}
};
// This is used only for parsing IMAP's FETCH ENVELOPE command, in which
// en_US-like date format is used like "01-Jan-2009 11:20:39 -0800", so this should be
// handled by Locale.US
private static final SimpleDateFormat DATE_TIME_FORMAT =
new SimpleDateFormat("dd-MMM-yyyy HH:mm:ss Z", Locale.US);
private boolean mIsInteger;
private int mParsedInteger;
private Date mParsedDate;
@Override
public final boolean isList() {
return false;
}
@Override
public final boolean isString() {
return true;
}
/**
* @return true if and only if the length of the string is larger than 0.
* <p>Note: IMAP NIL is considered an empty string. See {@link ImapResponseParser
* #parseBareString}. On the other hand, a quoted/literal string with value NIL (i.e. "NIL"
* and {3}\r\nNIL) is treated literally.
*/
public final boolean isEmpty() {
return getString().length() == 0;
}
public abstract String getString();
public abstract InputStream getAsStream();
/** @return whether it can be parsed as a number. */
public final boolean isNumber() {
if (mIsInteger) {
return true;
}
try {
mParsedInteger = Integer.parseInt(getString());
mIsInteger = true;
return true;
} catch (NumberFormatException e) {
return false;
}
}
/** @return value parsed as a number, or 0 if the string is not a number. */
public final int getNumberOrZero() {
return getNumber(0);
}
/** @return value parsed as a number, or {@code defaultValue} if the string is not a number. */
public final int getNumber(int defaultValue) {
if (!isNumber()) {
return defaultValue;
}
return mParsedInteger;
}
/** @return whether it can be parsed as a date using {@link #DATE_TIME_FORMAT}. */
public final boolean isDate() {
if (mParsedDate != null) {
return true;
}
if (isEmpty()) {
return false;
}
try {
mParsedDate = DATE_TIME_FORMAT.parse(getString());
return true;
} catch (ParseException e) {
VvmLog.w("ImapString", getString() + " can't be parsed as a date.");
return false;
}
}
/** @return value it can be parsed as a {@link Date}, or null otherwise. */
public final Date getDateOrNull() {
if (!isDate()) {
return null;
}
return mParsedDate;
}
/** @return whether the value case-insensitively equals to {@code s}. */
public final boolean is(String s) {
if (s == null) {
return false;
}
return getString().equalsIgnoreCase(s);
}
/** @return whether the value case-insensitively starts with {@code s}. */
public final boolean startsWith(String prefix) {
if (prefix == null) {
return false;
}
final String me = this.getString();
if (me.length() < prefix.length()) {
return false;
}
return me.substring(0, prefix.length()).equalsIgnoreCase(prefix);
}
// To force subclasses to implement it.
@Override
public abstract String toString();
@Override
public final boolean equalsForTest(ImapElement that) {
if (!super.equalsForTest(that)) {
return false;
}
ImapString thatString = (ImapString) that;
return getString().equals(thatString.getString());
}
}
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