Add UniFile

app/src/main/java/com/hippo/unifile/DocumentFile.java

@@ -0,0 +1,166 @@
+/*
+ * 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.hippo.unifile;
+
+import android.content.Context;
+import android.net.Uri;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+class DocumentFile extends UniFile {
+
+    private Context mContext;
+    private Uri mUri;
+
+    DocumentFile(UniFile parent, Context context, Uri uri) {
+        super(parent);
+        mContext = context;
+        mUri = uri;
+    }
+
+    @Override
+    public UniFile createFile(String displayName) {
+        UniFile child = contains(displayName);
+
+        if (child != null) {
+            if (child.isFile()) {
+                return child;
+            } else {
+                return null;
+            }
+        } else {
+            final Uri result = DocumentsContractApi21.createFile(mContext, mUri, "application/octet-stream", displayName);
+            return (result != null) ? new DocumentFile(this, mContext, result) : null;
+        }
+    }
+
+    @Override
+    public UniFile createDirectory(String displayName) {
+        UniFile child = contains(displayName);
+
+        if (child != null) {
+            if (child.isDirectory()) {
+                return child;
+            } else {
+                return null;
+            }
+        } else {
+            final Uri result = DocumentsContractApi21.createDirectory(mContext, mUri, displayName);
+            return (result != null) ? new DocumentFile(this, mContext, result) : null;
+        }
+    }
+
+    @Override
+    public Uri getUri() {
+        return mUri;
+    }
+
+    @Override
+    public String getName() {
+        return DocumentsContractApi19.getName(mContext, mUri);
+    }
+
+    @Override
+    public String getType() {
+        return DocumentsContractApi19.getType(mContext, mUri);
+    }
+
+    @Override
+    public boolean isDirectory() {
+        return DocumentsContractApi19.isDirectory(mContext, mUri);
+    }
+
+    @Override
+    public boolean isFile() {
+        return DocumentsContractApi19.isFile(mContext, mUri);
+    }
+
+    @Override
+    public long lastModified() {
+        return DocumentsContractApi19.lastModified(mContext, mUri);
+    }
+
+    @Override
+    public long length() {
+        return DocumentsContractApi19.length(mContext, mUri);
+    }
+
+    @Override
+    public boolean canRead() {
+        return DocumentsContractApi19.canRead(mContext, mUri);
+    }
+
+    @Override
+    public boolean canWrite() {
+        return DocumentsContractApi19.canWrite(mContext, mUri);
+    }
+
+    @Override
+    public boolean delete() {
+        return DocumentsContractApi19.delete(mContext, mUri);
+    }
+
+    @Override
+    public boolean exists() {
+        return DocumentsContractApi19.exists(mContext, mUri);
+    }
+
+    @Override
+    public UniFile contains(String displayName) {
+        Uri childUri = DocumentsContractApi21.buildChildUri(mUri, displayName);
+        return DocumentsContractApi19.exists(mContext, childUri) ?
+                new DocumentFile(this, mContext, childUri) : null;
+    }
+
+    @Override
+    public UniFile[] listFiles() {
+        final Uri[] result = DocumentsContractApi21.listFiles(mContext, mUri);
+        final UniFile[] resultFiles = new UniFile[result.length];
+        for (int i = 0; i < result.length; i++) {
+            resultFiles[i] = new DocumentFile(this, mContext, result[i]);
+        }
+        return resultFiles;
+    }
+
+    @Override
+    public boolean renameTo(String displayName) {
+        final Uri result = DocumentsContractApi21.renameTo(mContext, mUri, displayName);
+        if (result != null) {
+            mUri = result;
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public OutputStream openOutputStream() throws IOException {
+        return mContext.getContentResolver().openOutputStream(mUri);
+    }
+
+    @Override
+    public OutputStream openOutputStream(boolean append) throws IOException {
+        return mContext.getContentResolver().openOutputStream(mUri, append ? "wa" : "w");
+    }
+
+    @Override
+    public InputStream openInputStream() throws IOException {
+        return mContext.getContentResolver().openInputStream(mUri);
+    }
+}