Android example source code file (BridgeXmlBlockParser.java)

This example Android source code file (BridgeXmlBlockParser.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, binary, bridgexmlblockparser, bridgexmlpullattributes, content, end_tag, io, ioexception, ixmlpullparser, object, runtimeexception, start_document, start_tag, string, text, types, util, utilities, utils, xmlpullparserexception

The BridgeXmlBlockParser.java Android example source code

/*
 * Copyright (C) 2008 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.layoutlib.bridge;

import com.android.layoutlib.api.IXmlPullParser;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.content.res.XmlResourceParser;
import android.util.AttributeSet;
import android.util.XmlPullAttributes;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;

/**
 * {@link BridgeXmlBlockParser} reimplements most of android.xml.XmlBlock.Parser.
 * It delegates to both an instance of {@link XmlPullParser} and an instance of
 * {@link XmlPullAttributes} (for the {@link AttributeSet} part).
 */
public class BridgeXmlBlockParser implements XmlResourceParser {

    private XmlPullParser mParser;
    private XmlPullAttributes mAttrib;

    private boolean mStarted = false;
    private boolean mDecNextDepth = false;
    private int mDepth = 0;
    private int mEventType = START_DOCUMENT;
    private final boolean mPlatformFile;

    /**
     * Builds a {@link BridgeXmlBlockParser}.
     * @param parser The XmlPullParser to get the content from.
     * @param context the Context.
     * @param platformFile Indicates whether the the file is a platform file or not.
     */
    public BridgeXmlBlockParser(XmlPullParser parser, BridgeContext context, boolean platformFile) {
        mParser = parser;
        mPlatformFile = platformFile;
        mAttrib = new BridgeXmlPullAttributes(parser, context, mPlatformFile);
    }
    
    public boolean isPlatformFile() {
        return mPlatformFile;
    }

    public Object getViewKey() {
        if (mParser instanceof IXmlPullParser) {
            return ((IXmlPullParser)mParser).getViewKey();
        }

        return null;
    }
    
    
    // ------- XmlResourceParser implementation
    
    public void setFeature(String name, boolean state)
            throws XmlPullParserException {
        if (FEATURE_PROCESS_NAMESPACES.equals(name) && state) {
            return;
        }
        if (FEATURE_REPORT_NAMESPACE_ATTRIBUTES.equals(name) && state) {
            return;
        }
        throw new XmlPullParserException("Unsupported feature: " + name);
    }

    public boolean getFeature(String name) {
        if (FEATURE_PROCESS_NAMESPACES.equals(name)) {
            return true;
        }
        if (FEATURE_REPORT_NAMESPACE_ATTRIBUTES.equals(name)) {
            return true;
        }
        return false;
    }

    public void setProperty(String name, Object value) throws XmlPullParserException {
        throw new XmlPullParserException("setProperty() not supported");
    }

    public Object getProperty(String name) {
        return null;
    }

    public void setInput(Reader in) throws XmlPullParserException {
        mParser.setInput(in);
    }

    public void setInput(InputStream inputStream, String inputEncoding)
            throws XmlPullParserException {
        mParser.setInput(inputStream, inputEncoding);
    }

    public void defineEntityReplacementText(String entityName,
            String replacementText) throws XmlPullParserException {
        throw new XmlPullParserException(
                "defineEntityReplacementText() not supported");
    }

    public String getNamespacePrefix(int pos) throws XmlPullParserException {
        throw new XmlPullParserException("getNamespacePrefix() not supported");
    }

    public String getInputEncoding() {
        return null;
    }

    public String getNamespace(String prefix) {
        throw new RuntimeException("getNamespace() not supported");
    }

    public int getNamespaceCount(int depth) throws XmlPullParserException {
        throw new XmlPullParserException("getNamespaceCount() not supported");
    }

    public String getPositionDescription() {
        return "Binary XML file line #" + getLineNumber();
    }

    public String getNamespaceUri(int pos) throws XmlPullParserException {
        throw new XmlPullParserException("getNamespaceUri() not supported");
    }

    public int getColumnNumber() {
        return -1;
    }

    public int getDepth() {
        return mDepth;
    }

    public String getText() {
        return mParser.getText();
    }

    public int getLineNumber() {
        return mParser.getLineNumber();
    }

    public int getEventType() {
        return mEventType;
    }

    public boolean isWhitespace() throws XmlPullParserException {
        // Original comment: whitespace was stripped by aapt.
        return mParser.isWhitespace();
    }

    public String getPrefix() {
        throw new RuntimeException("getPrefix not supported");
    }

    public char[] getTextCharacters(int[] holderForStartAndLength) {
        String txt = getText();
        char[] chars = null;
        if (txt != null) {
            holderForStartAndLength[0] = 0;
            holderForStartAndLength[1] = txt.length();
            chars = new char[txt.length()];
            txt.getChars(0, txt.length(), chars, 0);
        }
        return chars;
    }

    public String getNamespace() {
        return mParser.getNamespace();
    }

    public String getName() {
        return mParser.getName();
    }

    public String getAttributeNamespace(int index) {
        return mParser.getAttributeNamespace(index);
    }

    public String getAttributeName(int index) {
        return mParser.getAttributeName(index);
    }

    public String getAttributePrefix(int index) {
        throw new RuntimeException("getAttributePrefix not supported");
    }

    public boolean isEmptyElementTag() {
        // XXX Need to detect this.
        return false;
    }

    public int getAttributeCount() {
        return mParser.getAttributeCount();
    }

    public String getAttributeValue(int index) {
        return mParser.getAttributeValue(index);
    }

    public String getAttributeType(int index) {
        return "CDATA";
    }

    public boolean isAttributeDefault(int index) {
        return false;
    }

    public int nextToken() throws XmlPullParserException, IOException {
        return next();
    }

    public String getAttributeValue(String namespace, String name) {
        return mParser.getAttributeValue(namespace, name);
    }

    public int next() throws XmlPullParserException, IOException {
        if (!mStarted) {
            mStarted = true;
            return START_DOCUMENT;
        }
        int ev = mParser.next();
        if (mDecNextDepth) {
            mDepth--;
            mDecNextDepth = false;
        }
        switch (ev) {
        case START_TAG:
            mDepth++;
            break;
        case END_TAG:
            mDecNextDepth = true;
            break;
        }
        mEventType = ev;
        return ev;
    }

    public void require(int type, String namespace, String name)
            throws XmlPullParserException {
        if (type != getEventType()
                || (namespace != null && !namespace.equals(getNamespace()))
                || (name != null && !name.equals(getName())))
            throw new XmlPullParserException("expected " + TYPES[type]
                    + getPositionDescription());
    }

    public String nextText() throws XmlPullParserException, IOException {
        if (getEventType() != START_TAG) {
            throw new XmlPullParserException(getPositionDescription()
                    + ": parser must be on START_TAG to read next text", this,
                    null);
        }
        int eventType = next();
        if (eventType == TEXT) {
            String result = getText();
            eventType = next();
            if (eventType != END_TAG) {
                throw new XmlPullParserException(
                        getPositionDescription()
                                + ": event TEXT it must be immediately followed by END_TAG",
                        this, null);
            }
            return result;
        } else if (eventType == END_TAG) {
            return "";
        } else {
            throw new XmlPullParserException(getPositionDescription()
                    + ": parser must be on START_TAG or TEXT to read text",
                    this, null);
        }
    }

    public int nextTag() throws XmlPullParserException, IOException {
        int eventType = next();
        if (eventType == TEXT && isWhitespace()) { // skip whitespace
            eventType = next();
        }
        if (eventType != START_TAG && eventType != END_TAG) {
            throw new XmlPullParserException(getPositionDescription()
                    + ": expected start or end tag", this, null);
        }
        return eventType;
    }

    // AttributeSet implementation

    
    public void close() {
        // pass
    }

    public boolean getAttributeBooleanValue(int index, boolean defaultValue) {
        return mAttrib.getAttributeBooleanValue(index, defaultValue);
    }

    public boolean getAttributeBooleanValue(String namespace, String attribute,
            boolean defaultValue) {
        return mAttrib.getAttributeBooleanValue(namespace, attribute, defaultValue);
    }

    public float getAttributeFloatValue(int index, float defaultValue) {
        return mAttrib.getAttributeFloatValue(index, defaultValue);
    }

    public float getAttributeFloatValue(String namespace, String attribute, float defaultValue) {
        return mAttrib.getAttributeFloatValue(namespace, attribute, defaultValue);
    }

    public int getAttributeIntValue(int index, int defaultValue) {
        return mAttrib.getAttributeIntValue(index, defaultValue);
    }

    public int getAttributeIntValue(String namespace, String attribute, int defaultValue) {
        return mAttrib.getAttributeIntValue(namespace, attribute, defaultValue);
    }

    public int getAttributeListValue(int index, String[] options, int defaultValue) {
        return mAttrib.getAttributeListValue(index, options, defaultValue);
    }

    public int getAttributeListValue(String namespace, String attribute,
            String[] options, int defaultValue) {
        return mAttrib.getAttributeListValue(namespace, attribute, options, defaultValue);
    }

    public int getAttributeNameResource(int index) {
        return mAttrib.getAttributeNameResource(index);
    }

    public int getAttributeResourceValue(int index, int defaultValue) {
        return mAttrib.getAttributeResourceValue(index, defaultValue);
    }

    public int getAttributeResourceValue(String namespace, String attribute, int defaultValue) {
        return mAttrib.getAttributeResourceValue(namespace, attribute, defaultValue);
    }

    public int getAttributeUnsignedIntValue(int index, int defaultValue) {
        return mAttrib.getAttributeUnsignedIntValue(index, defaultValue);
    }

    public int getAttributeUnsignedIntValue(String namespace, String attribute, int defaultValue) {
        return mAttrib.getAttributeUnsignedIntValue(namespace, attribute, defaultValue);
    }

    public String getClassAttribute() {
        return mAttrib.getClassAttribute();
    }

    public String getIdAttribute() {
        return mAttrib.getIdAttribute();
    }

    public int getIdAttributeResourceValue(int defaultValue) {
        return mAttrib.getIdAttributeResourceValue(defaultValue);
    }

    public int getStyleAttribute() {
        return mAttrib.getStyleAttribute();
    }
}