/**
* Copyright (c) 2010, 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 android.content;
import android.os.Parcel;
import android.os.Parcelable;
import android.text.TextUtils;
import java.util.ArrayList;
/**
* Meta-data describing the contents of a {@link ClipData}. Provides enough
* information to know if you can handle the ClipData, but not the data
* itself.
*
* <div class="special reference">
* <h3>Developer Guides</h3>
* <p>For more information about using the clipboard framework, read the
* <a href="{@docRoot}guide/topics/clipboard/copy-paste.html">Copy and Paste</a>
* developer guide.</p>
* </div>
*/
public class ClipDescription implements Parcelable {
/**
* The MIME type for a clip holding plain text.
*/
public static final String MIMETYPE_TEXT_PLAIN = "text/plain";
/**
* The MIME type for a clip holding HTML text.
*/
public static final String MIMETYPE_TEXT_HTML = "text/html";
/**
* The MIME type for a clip holding one or more URIs. This should be
* used for URIs that are meaningful to a user (such as an http: URI).
* It should <em>not</em> be used for a content: URI that references some
* other piece of data; in that case the MIME type should be the type
* of the referenced data.
*/
public static final String MIMETYPE_TEXT_URILIST = "text/uri-list";
/**
* The MIME type for a clip holding an Intent.
*/
public static final String MIMETYPE_TEXT_INTENT = "text/vnd.android.intent";
final CharSequence mLabel;
final String[] mMimeTypes;
/**
* Create a new clip.
*
* @param label Label to show to the user describing this clip.
* @param mimeTypes An array of MIME types this data is available as.
*/
public ClipDescription(CharSequence label, String[] mimeTypes) {
if (mimeTypes == null) {
throw new NullPointerException("mimeTypes is null");
}
mLabel = label;
mMimeTypes = mimeTypes;
}
/**
* Create a copy of a ClipDescription.
*/
public ClipDescription(ClipDescription o) {
mLabel = o.mLabel;
mMimeTypes = o.mMimeTypes;
}
/**
* Helper to compare two MIME types, where one may be a pattern.
* @param concreteType A fully-specified MIME type.
* @param desiredType A desired MIME type that may be a pattern such as */*.
* @return Returns true if the two MIME types match.
*/
public static boolean compareMimeTypes(String concreteType, String desiredType) {
final int typeLength = desiredType.length();
if (typeLength == 3 && desiredType.equals("*/*")) {
return true;
}
final int slashpos = desiredType.indexOf('/');
if (slashpos > 0) {
if (typeLength == slashpos+2 && desiredType.charAt(slashpos+1) == '*') {
if (desiredType.regionMatches(0, concreteType, 0, slashpos+1)) {
return true;
}
} else if (desiredType.equals(concreteType)) {
return true;
}
}
return false;
}
/**
* Return the label for this clip.
*/
public CharSequence getLabel() {
return mLabel;
}
/**
* Check whether the clip description contains the given MIME type.
*
* @param mimeType The desired MIME type. May be a pattern.
* @return Returns true if one of the MIME types in the clip description
* matches the desired MIME type, else false.
*/
public boolean hasMimeType(String mimeType) {
for (int i=0; i<mMimeTypes.length; i++) {
if (compareMimeTypes(mMimeTypes[i], mimeType)) {
return true;
}
}
return false;
}
/**
* Filter the clip description MIME types by the given MIME type. Returns
* all MIME types in the clip that match the given MIME type.
*
* @param mimeType The desired MIME type. May be a pattern.
* @return Returns an array of all matching MIME types. If there are no
* matching MIME types, null is returned.
*/
public String[] filterMimeTypes(String mimeType) {
ArrayList<String> array = null;
for (int i=0; i<mMimeTypes.length; i++) {
if (compareMimeTypes(mMimeTypes[i], mimeType)) {
if (array == null) {
array = new ArrayList<String>();
}
array.add(mMimeTypes[i]);
}
}
if (array == null) {
return null;
}
String[] rawArray = new String[array.size()];
array.toArray(rawArray);
return rawArray;
}
/**
* Return the number of MIME types the clip is available in.
*/
public int getMimeTypeCount() {
return mMimeTypes.length;
}
/**
* Return one of the possible clip MIME types.
*/
public String getMimeType(int index) {
return mMimeTypes[index];
}
/** @hide */
public void validate() {
if (mMimeTypes == null) {
throw new NullPointerException("null mime types");
}
if (mMimeTypes.length <= 0) {
throw new IllegalArgumentException("must have at least 1 mime type");
}
for (int i=0; i<mMimeTypes.length; i++) {
if (mMimeTypes[i] == null) {
throw new NullPointerException("mime type at " + i + " is null");
}
}
}
@Override
public String toString() {
StringBuilder b = new StringBuilder(128);
b.append("ClipDescription { ");
toShortString(b);
b.append(" }");
return b.toString();
}
/** @hide */
public boolean toShortString(StringBuilder b) {
boolean first = true;
for (int i=0; i<mMimeTypes.length; i++) {
if (!first) {
b.append(' ');
}
first = false;
b.append(mMimeTypes[i]);
}
if (mLabel != null) {
if (!first) {
b.append(' ');
}
first = false;
b.append('"');
b.append(mLabel);
b.append('"');
}
return !first;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
TextUtils.writeToParcel(mLabel, dest, flags);
dest.writeStringArray(mMimeTypes);
}
ClipDescription(Parcel in) {
mLabel = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(in);
mMimeTypes = in.createStringArray();
}
public static final Parcelable.Creator<ClipDescription> CREATOR =
new Parcelable.Creator<ClipDescription>() {
public ClipDescription createFromParcel(Parcel source) {
return new ClipDescription(source);
}
public ClipDescription[] newArray(int size) {
return new ClipDescription[size];
}
};
}
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