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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.messaging.datamodel.binding;
import java.util.concurrent.atomic.AtomicLong;
public class Binding<T extends BindableData> extends BindingBase<T> {
private static AtomicLong sBindingIdx = new AtomicLong(System.currentTimeMillis() * 1000);
private String mBindingId;
private T mData;
private final Object mOwner;
private boolean mWasBound;
/**
* Initialize a binding instance - the owner is typically the containing class
*/
Binding(final Object owner) {
mOwner = owner;
}
@Override
public T getData() {
ensureBound();
return mData;
}
@Override
public boolean isBound() {
return (mData != null && mData.isBound(mBindingId));
}
@Override
public boolean isBound(final T data) {
return (isBound() && data == mData);
}
@Override
public void ensureBound() {
if (!isBound()) {
throw new IllegalStateException("not bound; wasBound = " + mWasBound);
}
}
@Override
public void ensureBound(final T data) {
if (!isBound()) {
throw new IllegalStateException("not bound; wasBound = " + mWasBound);
} else if (data != mData) {
throw new IllegalStateException("not bound to correct data " + data + " vs " + mData);
}
}
@Override
public String getBindingId() {
return mBindingId;
}
public void bind(final T data) {
// Check both this binding and the data not already bound
if (mData != null || data.isBound()) {
throw new IllegalStateException("already bound when binding to " + data);
}
// Generate a unique identifier for this bind call
mBindingId = Long.toHexString(sBindingIdx.getAndIncrement());
data.bind(mBindingId);
mData = data;
mWasBound = true;
}
public void unbind() {
// Check this binding is bound and that data is bound to this binding
if (mData == null || !mData.isBound(mBindingId)) {
throw new IllegalStateException("not bound when unbind");
}
mData.unbind(mBindingId);
mData = null;
mBindingId = null;
}
}
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