com.google.gxp.html..svn.text-base.HtmlAppender.svn-base Maven / Gradle / Ivy

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Google XML Pages (GXP) is a templating system used to generate XML/SGML markup (most often HTML).
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/*
 * Copyright (C) 2008 Google Inc.
 *
 * 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.google.gxp.html;

import com.google.common.base.CharEscaper;
import com.google.common.base.CharEscapers;
import com.google.common.base.Preconditions;
import com.google.gxp.base.GxpContext;
import com.google.gxp.base.MarkupAppender;
import com.google.gxp.css.CssClosure;
import com.google.gxp.js.JavascriptClosure;
import com.google.gxp.text.PlaintextClosure;
import com.google.i18n.Localizable;

import java.io.IOException;

/**
 * Appender for content-type: text/html
 */
public class HtmlAppender extends MarkupAppender {

  public static final HtmlAppender INSTANCE = new HtmlAppender();
  private HtmlAppender() { }

  //////////////////////////////////////////////////////////////////////
  // CharEscaper
  //////////////////////////////////////////////////////////////////////

  @Override
  protected CharEscaper getCharEscaper(GxpContext gxpContext) {
    return CharEscapers.htmlEscaper();
  }

  //////////////////////////////////////////////////////////////////////
  // Closures
  //////////////////////////////////////////////////////////////////////

  /**
   * Appends a {@code CssClosure} to out. Surrounds it with a ");
    return out;
  }

  /**
   * Appends a {@code JavascriptClosure} to out. Surrounds it with a
   * ");
    return out;
  }

  /**
   * Appends a {@code PlaintextClosure} to out.
   */
  public  A append(A out, GxpContext gxpContext, PlaintextClosure closure)
      throws IOException {
    Preconditions.checkNotNull(closure);
    closure.write(getCharEscaper(gxpContext).escape(out), gxpContext);
    return out;
  }

  //////////////////////////////////////////////////////////////////////
  // Objects
  //////////////////////////////////////////////////////////////////////

  public  A append(A out, GxpContext gxpContext, Object value)
      throws IOException {
    Preconditions.checkNotNull(value);
    if (value instanceof Localizable) {
      append(out, gxpContext, (Localizable)value);
    } else if (value instanceof PlaintextClosure) {
      append(out, gxpContext, (PlaintextClosure)value);
    } else if (value instanceof CssClosure) {
      append(out, gxpContext, (CssClosure)value);
    } else if (value instanceof JavascriptClosure) {
      append(out, gxpContext, (JavascriptClosure)value);
    } else if (value instanceof HtmlClosure) {
      append(out, gxpContext, (HtmlClosure)value);
    } else {
      append(out, gxpContext, value.toString());
    }
    return out;
  }
}
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