primitivecontenthandler.java

Android平台上即时通讯聊天工具源代码。 支持手机聊天。

/*
 * Copyright (C) 2007 Esmertec AG.
 * Copyright (C) 2007 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.im.imps;

import java.util.Stack;

import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;

import com.android.im.imps.Primitive.TransactionMode;

public final class PrimitiveContentHandler extends DefaultHandler {
    private Primitive mPrimitive;
    private String mCurTagName;
    private boolean mIsTransContent;
    private Stack<PrimitiveElement> mContentElementsStack;

    public PrimitiveContentHandler() {
        mPrimitive = new Primitive();
        mContentElementsStack = new Stack<PrimitiveElement>();
    }

    public void reset() {
        mPrimitive = new Primitive();
        mContentElementsStack.clear();

        mIsTransContent = false;
    }

    public Primitive getPrimitive() {
        return mPrimitive;
    }

    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) {
        if (mIsTransContent) {
            if (mContentElementsStack.empty()) {
                mPrimitive.setContentElement(localName);
                mContentElementsStack.push(mPrimitive.getContentElement());
            } else {
                PrimitiveElement parentPrimitive = mContentElementsStack.peek();
                PrimitiveElement childPrimitive = new PrimitiveElement(
                        localName);

                parentPrimitive.addChild(childPrimitive);
                mContentElementsStack.push(childPrimitive);
            }
        } else {
            if (ImpsTags.TransactionContent.equals(localName)) {
                mIsTransContent = true;
            }
        }

        mCurTagName = localName;
    }

    @Override
    public void endElement(String uri, String localName, String qName) {
        if (ImpsTags.TransactionContent.equals(localName)) {
            mIsTransContent = false;
        }

        if (mIsTransContent) {
            if (!mContentElementsStack.empty()) {
                mContentElementsStack.pop();
            }
        }
        mCurTagName = null;
    }

    @Override
    public void characters(char[] ch, int start, int length) {
        String contentStr = ImpsUtils.trim(new String(ch, start, length));
        if (contentStr == null || contentStr.length() == 0) {
            return;
        }
        if (mIsTransContent) {
            if (!ImpsTags.TransactionContent.equals(mCurTagName)) {
                PrimitiveElement curPrimitive = mContentElementsStack.peek();

                curPrimitive.setContents(contentStr);
            }
        } else {
            if (ImpsTags.TransactionID.equals(mCurTagName)) {
                mPrimitive.setTransactionId(contentStr);
            } else if (ImpsTags.TransactionMode.equals(mCurTagName)) {
                mPrimitive.setTransactionMode(TransactionMode.valueOf(contentStr));
            } else if (ImpsTags.SessionID.equals(mCurTagName)) {
                mPrimitive.setSession(contentStr);
            } else if (ImpsTags.Poll.equals(mCurTagName)) {
                mPrimitive.setPoll(contentStr);
            } else if (ImpsTags.CIR.equals(mCurTagName)) {
                mPrimitive.setCir(contentStr);
            }
        }
    }
}