| /* |
| * 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.tools.idea.rendering; |
| |
| import com.android.tools.idea.lang.databinding.DbUtil; |
| import com.google.common.collect.Lists; |
| import com.intellij.psi.xml.XmlAttribute; |
| import com.intellij.psi.xml.XmlTag; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.util.List; |
| |
| import static com.android.SdkConstants.PREFIX_BINDING_EXPR; |
| |
| /** |
| * A snapshot of an attribute value pulled from PSI. Used in conjunction with {@link TagSnapshot}. |
| */ |
| public class AttributeSnapshot { |
| @Nullable public String namespace; |
| @Nullable public String prefix; |
| @NotNull public String name; |
| @Nullable public String value; |
| |
| AttributeSnapshot(@Nullable String namespace, @Nullable String prefix, @NotNull String name, @Nullable String value) { |
| this.namespace = namespace; |
| this.prefix = prefix == null || prefix.isEmpty() ? null : prefix; |
| this.name = name; |
| this.value = value; |
| } |
| |
| /** |
| * Creates a snapshot of the given attribute. |
| * <p> |
| * NOTE: Returns null if the attribute should not be passed to LayoutLib. |
| */ |
| @Nullable |
| public static AttributeSnapshot createAttributeSnapshot(@NotNull XmlAttribute psiAttribute) { |
| String localName = psiAttribute.getLocalName(); |
| String namespace = psiAttribute.getNamespace(); |
| String prefix = psiAttribute.getNamespacePrefix(); |
| String value = psiAttribute.getValue(); |
| if (value != null && value.startsWith(PREFIX_BINDING_EXPR)) { |
| // if this is a binding expression, get the default value. |
| value = DbUtil.getBindingExprDefault(psiAttribute); |
| if (value == null) { |
| // If no default value, strip the attribute completely. |
| return null; |
| } |
| } |
| return new AttributeSnapshot(namespace, prefix, localName, value); |
| } |
| |
| /** Creates a list of attribute snapshots corresponding to the attributes of the given tag */ |
| @NotNull |
| public static List<AttributeSnapshot> createAttributesForTag(@NotNull XmlTag tag) { |
| // Attributes |
| XmlAttribute[] psiAttributes = tag.getAttributes(); |
| List<AttributeSnapshot> attributes = Lists.newArrayListWithExpectedSize(psiAttributes.length); |
| for (XmlAttribute psiAttribute : psiAttributes) { |
| AttributeSnapshot attribute = createAttributeSnapshot(psiAttribute); |
| if (attribute != null) { |
| attributes.add(attribute); |
| } |
| } |
| |
| return attributes; |
| } |
| |
| @Override |
| public String toString() { |
| return "AttributeSnapshot{" + name + "=\"" + value + "\"}"; |
| } |
| } |