graphics/drawable/static/src/android/support/graphics/drawable/TypedArrayUtils.java

/*
 * 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 android.support.graphics.drawable;

import android.content.res.Resources;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.TypedValue;

import org.xmlpull.v1.XmlPullParser;

class TypedArrayUtils {
    private static final String NAMESPACE = "http://schemas.android.com/apk/res/android";

    public static boolean hasAttribute(XmlPullParser parser, String attrName) {
        return parser.getAttributeValue(NAMESPACE, attrName) != null;
    }

    public static float getNamedFloat(TypedArray a, XmlPullParser parser, String attrName,
                                      int resId, float defaultValue) {
        final boolean hasAttr = hasAttribute(parser, attrName);
        if (!hasAttr) {
            return defaultValue;
        } else {
            return a.getFloat(resId, defaultValue);
        }
    }

    public static boolean getNamedBoolean(TypedArray a, XmlPullParser parser, String attrName,
                                          int resId, boolean defaultValue) {
        final boolean hasAttr = hasAttribute(parser, attrName);
        if (!hasAttr) {
            return defaultValue;
        } else {
            return a.getBoolean(resId, defaultValue);
        }
    }

    public static int getNamedInt(TypedArray a, XmlPullParser parser, String attrName,
                                  int resId, int defaultValue) {
        final boolean hasAttr = hasAttribute(parser, attrName);
        if (!hasAttr) {
            return defaultValue;
        } else {
            return a.getInt(resId, defaultValue);
        }
    }

    public static int getNamedColor(TypedArray a, XmlPullParser parser, String attrName,
                                    int resId, int defaultValue) {
        final boolean hasAttr = hasAttribute(parser, attrName);
        if (!hasAttr) {
            return defaultValue;
        } else {
            return a.getColor(resId, defaultValue);
        }
    }

    public static String getNamedString(TypedArray a, XmlPullParser parser, String attrName,
            int resId) {
        final boolean hasAttr = hasAttribute(parser, attrName);
        if (!hasAttr) {
            return null;
        } else {
            return a.getString(resId);
        }
    }

    public static int getNamedResId(TypedArray a, XmlPullParser parser, String attrName,
            int resId, int defaultValue) {
        final boolean hasAttr = hasAttribute(parser, attrName);
        if (!hasAttr) {
            return defaultValue;
        } else {
            return a.getResourceId(resId, defaultValue);
        }
    }

    public static TypedValue peekNamedValue(TypedArray a, XmlPullParser parser, String attrName,
            int resId) {
        final boolean hasAttr = hasAttribute(parser, attrName);
        if (!hasAttr) {
            return null;
        } else {
            return a.peekValue(resId);
        }
    }

    /**
     * Obtains styled attributes from the theme, if available, or unstyled
     * resources if the theme is null.
     */
    public static TypedArray obtainAttributes(
            Resources res, Resources.Theme theme, AttributeSet set, int[] attrs) {
        if (theme == null) {
            return res.obtainAttributes(set, attrs);
        }
        return theme.obtainStyledAttributes(set, attrs, 0, 0);
    }
}